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(nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n\n\n\n// WEBPACK FOOTER //\n// C:/Dropbox/www/amcharts4dev/node_modules/ieee754/index.js","var toString = {}.toString;\n\nmodule.exports = Array.isArray || function (arr) {\n  return toString.call(arr) == '[object Array]';\n};\n\n\n\n// WEBPACK FOOTER //\n// C:/Dropbox/www/amcharts4dev/node_modules/isarray/index.js","/* build: `node build.js modules=ALL exclude=gestures,accessors requirejs minifier=uglifyjs` */\n/*! Fabric.js Copyright 2008-2015, Printio (Juriy Zaytsev, Maxim Chernyak) */\n\nvar fabric = fabric || { version: '3.3.0' };\nif (typeof exports !== 'undefined') {\n  exports.fabric = fabric;\n}\n/* _AMD_START_ */\nelse if (typeof define === 'function' && define.amd) {\n  define([], function() { return fabric; });\n}\n/* _AMD_END_ */\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n  if (document instanceof (typeof HTMLDocument !== 'undefined' ? HTMLDocument : Document)) {\n    fabric.document = document;\n  }\n  else {\n    fabric.document = document.implementation.createHTMLDocument('');\n  }\n  fabric.window = window;\n}\nelse {\n  // assume we're running under node.js when document/window are not present\n  var jsdom = require('jsdom');\n  var virtualWindow = new jsdom.JSDOM(\n    decodeURIComponent('%3C!DOCTYPE%20html%3E%3Chtml%3E%3Chead%3E%3C%2Fhead%3E%3Cbody%3E%3C%2Fbody%3E%3C%2Fhtml%3E'),\n    {\n      features: {\n        FetchExternalResources: ['img']\n      },\n      resources: 'usable'\n    }).window;\n  fabric.document = virtualWindow.document;\n  fabric.jsdomImplForWrapper = require('jsdom/lib/jsdom/living/generated/utils').implForWrapper;\n  fabric.nodeCanvas = require('jsdom/lib/jsdom/utils').Canvas;\n  fabric.window = virtualWindow;\n  DOMParser = fabric.window.DOMParser;\n}\n\n/**\n * True when in environment that supports touch events\n * @type boolean\n */\nfabric.isTouchSupported = 'ontouchstart' in fabric.window || 'ontouchstart' in fabric.document ||\n  (fabric.window && fabric.window.navigator && fabric.window.navigator.maxTouchPoints > 0);\n\n/**\n * True when in environment that's probably Node.js\n * @type boolean\n */\nfabric.isLikelyNode = typeof Buffer !== 'undefined' &&\n                      typeof window === 'undefined';\n\n/* _FROM_SVG_START_ */\n/**\n * Attributes parsed from all SVG elements\n * @type array\n */\nfabric.SHARED_ATTRIBUTES = [\n  'display',\n  'transform',\n  'fill', 'fill-opacity', 'fill-rule',\n  'opacity',\n  'stroke', 'stroke-dasharray', 'stroke-linecap', 'stroke-dashoffset',\n  'stroke-linejoin', 'stroke-miterlimit',\n  'stroke-opacity', 'stroke-width',\n  'id', 'paint-order', 'vector-effect',\n  'instantiated_by_use', 'clip-path'\n];\n/* _FROM_SVG_END_ */\n\n/**\n * Pixel per Inch as a default value set to 96. Can be changed for more realistic conversion.\n */\nfabric.DPI = 96;\nfabric.reNum = '(?:[-+]?(?:\\\\d+|\\\\d*\\\\.\\\\d+)(?:[eE][-+]?\\\\d+)?)';\nfabric.fontPaths = { };\nfabric.iMatrix = [1, 0, 0, 1, 0, 0];\n\n/**\n * Pixel limit for cache canvases. 1Mpx , 4Mpx should be fine.\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.perfLimitSizeTotal = 2097152;\n\n/**\n * Pixel limit for cache canvases width or height. IE fixes the maximum at 5000\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.maxCacheSideLimit = 4096;\n\n/**\n * Lowest pixel limit for cache canvases, set at 256PX\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.minCacheSideLimit = 256;\n\n/**\n * Cache Object for widths of chars in text rendering.\n */\nfabric.charWidthsCache = { };\n\n/**\n * if webgl is enabled and available, textureSize will determine the size\n * of the canvas backend\n * @since 2.0.0\n * @type Number\n * @default\n */\nfabric.textureSize = 2048;\n\n/**\n * When 'true', style information is not retained when copy/pasting text, making\n * pasted text use destination style.\n * Defaults to 'false'.\n * @type Boolean\n * @default\n */\nfabric.disableStyleCopyPaste = false;\n\n/**\n * Enable webgl for filtering picture is available\n * A filtering backend will be initialized, this will both take memory and\n * time since a default 2048x2048 canvas will be created for the gl context\n * @since 2.0.0\n * @type Boolean\n * @default\n */\nfabric.enableGLFiltering = true;\n\n/**\n * Device Pixel Ratio\n * @see https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/HTML-canvas-guide/SettingUptheCanvas/SettingUptheCanvas.html\n */\nfabric.devicePixelRatio = fabric.window.devicePixelRatio ||\n                          fabric.window.webkitDevicePixelRatio ||\n                          fabric.window.mozDevicePixelRatio ||\n                          1;\n/**\n * Browser-specific constant to adjust CanvasRenderingContext2D.shadowBlur value,\n * which is unitless and not rendered equally across browsers.\n *\n * Values that work quite well (as of October 2017) are:\n * - Chrome: 1.5\n * - Edge: 1.75\n * - Firefox: 0.9\n * - Safari: 0.95\n *\n * @since 2.0.0\n * @type Number\n * @default 1\n */\nfabric.browserShadowBlurConstant = 1;\n\n/**\n * This object contains the result of arc to beizer conversion for faster retrieving if the same arc needs to be converted again.\n * It was an internal variable, is accessible since version 2.3.4\n */\nfabric.arcToSegmentsCache = { };\n\n/**\n * This object keeps the results of the boundsOfCurve calculation mapped by the joined arguments necessary to calculate it.\n * It does speed up calculation, if you parse and add always the same paths, but in case of heavy usage of freedrawing\n * you do not get any speed benefit and you get a big object in memory.\n * The object was a private variable before, while now is appended to the lib so that you have access to it and you\n * can eventually clear it.\n * It was an internal variable, is accessible since version 2.3.4\n */\nfabric.boundsOfCurveCache = { };\n\n/**\n * If disabled boundsOfCurveCache is not used. For apps that make heavy usage of pencil drawing probably disabling it is better\n * @default true\n */\nfabric.cachesBoundsOfCurve = true;\n\n/**\n * Skip performance testing of setupGLContext and force the use of putImageData that seems to be the one that works best on\n * Chrome + old hardware. if your users are experiencing empty images after filtering you may try to force this to true\n * this has to be set before instantiating the filtering backend ( before filtering the first image )\n * @type Boolean\n * @default false\n */\nfabric.forceGLPutImageData = false;\n\nfabric.initFilterBackend = function() {\n  if (fabric.enableGLFiltering && fabric.isWebglSupported && fabric.isWebglSupported(fabric.textureSize)) {\n    console.log('max texture size: ' + fabric.maxTextureSize);\n    return (new fabric.WebglFilterBackend({ tileSize: fabric.textureSize }));\n  }\n  else if (fabric.Canvas2dFilterBackend) {\n    return (new fabric.Canvas2dFilterBackend());\n  }\n};\n\n\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n  // ensure globality even if entire library were function wrapped (as in Meteor.js packaging system)\n  window.fabric = fabric;\n}\n\n\n(function() {\n\n  /**\n   * @private\n   * @param {String} eventName\n   * @param {Function} handler\n   */\n  function _removeEventListener(eventName, handler) {\n    if (!this.__eventListeners[eventName]) {\n      return;\n    }\n    var eventListener = this.__eventListeners[eventName];\n    if (handler) {\n      eventListener[eventListener.indexOf(handler)] = false;\n    }\n    else {\n      fabric.util.array.fill(eventListener, false);\n    }\n  }\n\n  /**\n   * Observes specified event\n   * @deprecated `observe` deprecated since 0.8.34 (use `on` instead)\n   * @memberOf fabric.Observable\n   * @alias on\n   * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n   * @param {Function} handler Function that receives a notification when an event of the specified type occurs\n   * @return {Self} thisArg\n   * @chainable\n   */\n  function observe(eventName, handler) {\n    if (!this.__eventListeners) {\n      this.__eventListeners = { };\n    }\n    // one object with key/value pairs was passed\n    if (arguments.length === 1) {\n      for (var prop in eventName) {\n        this.on(prop, eventName[prop]);\n      }\n    }\n    else {\n      if (!this.__eventListeners[eventName]) {\n        this.__eventListeners[eventName] = [];\n      }\n      this.__eventListeners[eventName].push(handler);\n    }\n    return this;\n  }\n\n  /**\n   * Stops event observing for a particular event handler. Calling this method\n   * without arguments removes all handlers for all events\n   * @deprecated `stopObserving` deprecated since 0.8.34 (use `off` instead)\n   * @memberOf fabric.Observable\n   * @alias off\n   * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n   * @param {Function} handler Function to be deleted from EventListeners\n   * @return {Self} thisArg\n   * @chainable\n   */\n  function stopObserving(eventName, handler) {\n    if (!this.__eventListeners) {\n      return this;\n    }\n\n    // remove all key/value pairs (event name -> event handler)\n    if (arguments.length === 0) {\n      for (eventName in this.__eventListeners) {\n        _removeEventListener.call(this, eventName);\n      }\n    }\n    // one object with key/value pairs was passed\n    else if (arguments.length === 1 && typeof arguments[0] === 'object') {\n      for (var prop in eventName) {\n        _removeEventListener.call(this, prop, eventName[prop]);\n      }\n    }\n    else {\n      _removeEventListener.call(this, eventName, handler);\n    }\n    return this;\n  }\n\n  /**\n   * Fires event with an optional options object\n   * @deprecated `fire` deprecated since 1.0.7 (use `trigger` instead)\n   * @memberOf fabric.Observable\n   * @alias trigger\n   * @param {String} eventName Event name to fire\n   * @param {Object} [options] Options object\n   * @return {Self} thisArg\n   * @chainable\n   */\n  function fire(eventName, options) {\n    if (!this.__eventListeners) {\n      return this;\n    }\n\n    var listenersForEvent = this.__eventListeners[eventName];\n    if (!listenersForEvent) {\n      return this;\n    }\n\n    for (var i = 0, len = listenersForEvent.length; i < len; i++) {\n      listenersForEvent[i] && listenersForEvent[i].call(this, options || { });\n    }\n    this.__eventListeners[eventName] = listenersForEvent.filter(function(value) {\n      return value !== false;\n    });\n    return this;\n  }\n\n  /**\n   * @namespace fabric.Observable\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#events}\n   * @see {@link http://fabricjs.com/events|Events demo}\n   */\n  fabric.Observable = {\n    observe: observe,\n    stopObserving: stopObserving,\n    fire: fire,\n\n    on: observe,\n    off: stopObserving,\n    trigger: fire\n  };\n})();\n\n\n/**\n * @namespace fabric.Collection\n */\nfabric.Collection = {\n\n  _objects: [],\n\n  /**\n   * Adds objects to collection, Canvas or Group, then renders canvas\n   * (if `renderOnAddRemove` is not `false`).\n   * in case of Group no changes to bounding box are made.\n   * Objects should be instances of (or inherit from) fabric.Object\n   * Use of this function is highly discouraged for groups.\n   * you can add a bunch of objects with the add method but then you NEED\n   * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n   * @param {...fabric.Object} object Zero or more fabric instances\n   * @return {Self} thisArg\n   * @chainable\n   */\n  add: function () {\n    this._objects.push.apply(this._objects, arguments);\n    if (this._onObjectAdded) {\n      for (var i = 0, length = arguments.length; i < length; i++) {\n        this._onObjectAdded(arguments[i]);\n      }\n    }\n    this.renderOnAddRemove && this.requestRenderAll();\n    return this;\n  },\n\n  /**\n   * Inserts an object into collection at specified index, then renders canvas (if `renderOnAddRemove` is not `false`)\n   * An object should be an instance of (or inherit from) fabric.Object\n   * Use of this function is highly discouraged for groups.\n   * you can add a bunch of objects with the insertAt method but then you NEED\n   * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n   * @param {Object} object Object to insert\n   * @param {Number} index Index to insert object at\n   * @param {Boolean} nonSplicing When `true`, no splicing (shifting) of objects occurs\n   * @return {Self} thisArg\n   * @chainable\n   */\n  insertAt: function (object, index, nonSplicing) {\n    var objects = this._objects;\n    if (nonSplicing) {\n      objects[index] = object;\n    }\n    else {\n      objects.splice(index, 0, object);\n    }\n    this._onObjectAdded && this._onObjectAdded(object);\n    this.renderOnAddRemove && this.requestRenderAll();\n    return this;\n  },\n\n  /**\n   * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)\n   * @param {...fabric.Object} object Zero or more fabric instances\n   * @return {Self} thisArg\n   * @chainable\n   */\n  remove: function() {\n    var objects = this._objects,\n        index, somethingRemoved = false;\n\n    for (var i = 0, length = arguments.length; i < length; i++) {\n      index = objects.indexOf(arguments[i]);\n\n      // only call onObjectRemoved if an object was actually removed\n      if (index !== -1) {\n        somethingRemoved = true;\n        objects.splice(index, 1);\n        this._onObjectRemoved && this._onObjectRemoved(arguments[i]);\n      }\n    }\n\n    this.renderOnAddRemove && somethingRemoved && this.requestRenderAll();\n    return this;\n  },\n\n  /**\n   * Executes given function for each object in this group\n   * @param {Function} callback\n   *                   Callback invoked with current object as first argument,\n   *                   index - as second and an array of all objects - as third.\n   *                   Callback is invoked in a context of Global Object (e.g. `window`)\n   *                   when no `context` argument is given\n   *\n   * @param {Object} context Context (aka thisObject)\n   * @return {Self} thisArg\n   * @chainable\n   */\n  forEachObject: function(callback, context) {\n    var objects = this.getObjects();\n    for (var i = 0, len = objects.length; i < len; i++) {\n      callback.call(context, objects[i], i, objects);\n    }\n    return this;\n  },\n\n  /**\n   * Returns an array of children objects of this instance\n   * Type parameter introduced in 1.3.10\n   * since 2.3.5 this method return always a COPY of the array;\n   * @param {String} [type] When specified, only objects of this type are returned\n   * @return {Array}\n   */\n  getObjects: function(type) {\n    if (typeof type === 'undefined') {\n      return this._objects.concat();\n    }\n    return this._objects.filter(function(o) {\n      return o.type === type;\n    });\n  },\n\n  /**\n   * Returns object at specified index\n   * @param {Number} index\n   * @return {Self} thisArg\n   */\n  item: function (index) {\n    return this._objects[index];\n  },\n\n  /**\n   * Returns true if collection contains no objects\n   * @return {Boolean} true if collection is empty\n   */\n  isEmpty: function () {\n    return this._objects.length === 0;\n  },\n\n  /**\n   * Returns a size of a collection (i.e: length of an array containing its objects)\n   * @return {Number} Collection size\n   */\n  size: function() {\n    return this._objects.length;\n  },\n\n  /**\n   * Returns true if collection contains an object\n   * @param {Object} object Object to check against\n   * @return {Boolean} `true` if collection contains an object\n   */\n  contains: function(object) {\n    return this._objects.indexOf(object) > -1;\n  },\n\n  /**\n   * Returns number representation of a collection complexity\n   * @return {Number} complexity\n   */\n  complexity: function () {\n    return this._objects.reduce(function (memo, current) {\n      memo += current.complexity ? current.complexity() : 0;\n      return memo;\n    }, 0);\n  }\n};\n\n\n/**\n * @namespace fabric.CommonMethods\n */\nfabric.CommonMethods = {\n\n  /**\n   * Sets object's properties from options\n   * @param {Object} [options] Options object\n   */\n  _setOptions: function(options) {\n    for (var prop in options) {\n      this.set(prop, options[prop]);\n    }\n  },\n\n  /**\n   * @private\n   * @param {Object} [filler] Options object\n   * @param {String} [property] property to set the Gradient to\n   */\n  _initGradient: function(filler, property) {\n    if (filler && filler.colorStops && !(filler instanceof fabric.Gradient)) {\n      this.set(property, new fabric.Gradient(filler));\n    }\n  },\n\n  /**\n   * @private\n   * @param {Object} [filler] Options object\n   * @param {String} [property] property to set the Pattern to\n   * @param {Function} [callback] callback to invoke after pattern load\n   */\n  _initPattern: function(filler, property, callback) {\n    if (filler && filler.source && !(filler instanceof fabric.Pattern)) {\n      this.set(property, new fabric.Pattern(filler, callback));\n    }\n    else {\n      callback && callback();\n    }\n  },\n\n  /**\n   * @private\n   * @param {Object} [options] Options object\n   */\n  _initClipping: function(options) {\n    if (!options.clipTo || typeof options.clipTo !== 'string') {\n      return;\n    }\n\n    var functionBody = fabric.util.getFunctionBody(options.clipTo);\n    if (typeof functionBody !== 'undefined') {\n      this.clipTo = new Function('ctx', functionBody);\n    }\n  },\n\n  /**\n   * @private\n   */\n  _setObject: function(obj) {\n    for (var prop in obj) {\n      this._set(prop, obj[prop]);\n    }\n  },\n\n  /**\n   * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.\n   * @param {String|Object} key Property name or object (if object, iterate over the object properties)\n   * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  set: function(key, value) {\n    if (typeof key === 'object') {\n      this._setObject(key);\n    }\n    else {\n      if (typeof value === 'function' && key !== 'clipTo') {\n        this._set(key, value(this.get(key)));\n      }\n      else {\n        this._set(key, value);\n      }\n    }\n    return this;\n  },\n\n  _set: function(key, value) {\n    this[key] = value;\n  },\n\n  /**\n   * Toggles specified property from `true` to `false` or from `false` to `true`\n   * @param {String} property Property to toggle\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  toggle: function(property) {\n    var value = this.get(property);\n    if (typeof value === 'boolean') {\n      this.set(property, !value);\n    }\n    return this;\n  },\n\n  /**\n   * Basic getter\n   * @param {String} property Property name\n   * @return {*} value of a property\n   */\n  get: function(property) {\n    return this[property];\n  }\n};\n\n\n(function(global) {\n\n  var sqrt = Math.sqrt,\n      atan2 = Math.atan2,\n      pow = Math.pow,\n      abs = Math.abs,\n      PiBy180 = Math.PI / 180,\n      PiBy2 = Math.PI / 2;\n\n  /**\n   * @namespace fabric.util\n   */\n  fabric.util = {\n\n    /**\n     * Calculate the cos of an angle, avoiding returning floats for known results\n     * @static\n     * @memberOf fabric.util\n     * @param {Number} angle the angle in radians or in degree\n     * @return {Number}\n     */\n    cos: function(angle) {\n      if (angle === 0) { return 1; }\n      if (angle < 0) {\n        // cos(a) = cos(-a)\n        angle = -angle;\n      }\n      var angleSlice = angle / PiBy2;\n      switch (angleSlice) {\n        case 1: case 3: return 0;\n        case 2: return -1;\n      }\n      return Math.cos(angle);\n    },\n\n    /**\n     * Calculate the sin of an angle, avoiding returning floats for known results\n     * @static\n     * @memberOf fabric.util\n     * @param {Number} angle the angle in radians or in degree\n     * @return {Number}\n     */\n    sin: function(angle) {\n      if (angle === 0) { return 0; }\n      var angleSlice = angle / PiBy2, sign = 1;\n      if (angle < 0) {\n        // sin(-a) = -sin(a)\n        sign = -1;\n      }\n      switch (angleSlice) {\n        case 1: return sign;\n        case 2: return 0;\n        case 3: return -sign;\n      }\n      return Math.sin(angle);\n    },\n\n    /**\n     * Removes value from an array.\n     * Presence of value (and its position in an array) is determined via `Array.prototype.indexOf`\n     * @static\n     * @memberOf fabric.util\n     * @param {Array} array\n     * @param {*} value\n     * @return {Array} original array\n     */\n    removeFromArray: function(array, value) {\n      var idx = array.indexOf(value);\n      if (idx !== -1) {\n        array.splice(idx, 1);\n      }\n      return array;\n    },\n\n    /**\n     * Returns random number between 2 specified ones.\n     * @static\n     * @memberOf fabric.util\n     * @param {Number} min lower limit\n     * @param {Number} max upper limit\n     * @return {Number} random value (between min and max)\n     */\n    getRandomInt: function(min, max) {\n      return Math.floor(Math.random() * (max - min + 1)) + min;\n    },\n\n    /**\n     * Transforms degrees to radians.\n     * @static\n     * @memberOf fabric.util\n     * @param {Number} degrees value in degrees\n     * @return {Number} value in radians\n     */\n    degreesToRadians: function(degrees) {\n      return degrees * PiBy180;\n    },\n\n    /**\n     * Transforms radians to degrees.\n     * @static\n     * @memberOf fabric.util\n     * @param {Number} radians value in radians\n     * @return {Number} value in degrees\n     */\n    radiansToDegrees: function(radians) {\n      return radians / PiBy180;\n    },\n\n    /**\n     * Rotates `point` around `origin` with `radians`\n     * @static\n     * @memberOf fabric.util\n     * @param {fabric.Point} point The point to rotate\n     * @param {fabric.Point} origin The origin of the rotation\n     * @param {Number} radians The radians of the angle for the rotation\n     * @return {fabric.Point} The new rotated point\n     */\n    rotatePoint: function(point, origin, radians) {\n      point.subtractEquals(origin);\n      var v = fabric.util.rotateVector(point, radians);\n      return new fabric.Point(v.x, v.y).addEquals(origin);\n    },\n\n    /**\n     * Rotates `vector` with `radians`\n     * @static\n     * @memberOf fabric.util\n     * @param {Object} vector The vector to rotate (x and y)\n     * @param {Number} radians The radians of the angle for the rotation\n     * @return {Object} The new rotated point\n     */\n    rotateVector: function(vector, radians) {\n      var sin = fabric.util.sin(radians),\n          cos = fabric.util.cos(radians),\n          rx = vector.x * cos - vector.y * sin,\n          ry = vector.x * sin + vector.y * cos;\n      return {\n        x: rx,\n        y: ry\n      };\n    },\n\n    /**\n     * Apply transform t to point p\n     * @static\n     * @memberOf fabric.util\n     * @param  {fabric.Point} p The point to transform\n     * @param  {Array} t The transform\n     * @param  {Boolean} [ignoreOffset] Indicates that the offset should not be applied\n     * @return {fabric.Point} The transformed point\n     */\n    transformPoint: function(p, t, ignoreOffset) {\n      if (ignoreOffset) {\n        return new fabric.Point(\n          t[0] * p.x + t[2] * p.y,\n          t[1] * p.x + t[3] * p.y\n        );\n      }\n      return new fabric.Point(\n        t[0] * p.x + t[2] * p.y + t[4],\n        t[1] * p.x + t[3] * p.y + t[5]\n      );\n    },\n\n    /**\n     * Returns coordinates of points's bounding rectangle (left, top, width, height)\n     * @param {Array} points 4 points array\n     * @return {Object} Object with left, top, width, height properties\n     */\n    makeBoundingBoxFromPoints: function(points) {\n      var xPoints = [points[0].x, points[1].x, points[2].x, points[3].x],\n          minX = fabric.util.array.min(xPoints),\n          maxX = fabric.util.array.max(xPoints),\n          width = maxX - minX,\n          yPoints = [points[0].y, points[1].y, points[2].y, points[3].y],\n          minY = fabric.util.array.min(yPoints),\n          maxY = fabric.util.array.max(yPoints),\n          height = maxY - minY;\n\n      return {\n        left: minX,\n        top: minY,\n        width: width,\n        height: height\n      };\n    },\n\n    /**\n     * Invert transformation t\n     * @static\n     * @memberOf fabric.util\n     * @param {Array} t The transform\n     * @return {Array} The inverted transform\n     */\n    invertTransform: function(t) {\n      var a = 1 / (t[0] * t[3] - t[1] * t[2]),\n          r = [a * t[3], -a * t[1], -a * t[2], a * t[0]],\n          o = fabric.util.transformPoint({ x: t[4], y: t[5] }, r, true);\n      r[4] = -o.x;\n      r[5] = -o.y;\n      return r;\n    },\n\n    /**\n     * A wrapper around Number#toFixed, which contrary to native method returns number, not string.\n     * @static\n     * @memberOf fabric.util\n     * @param {Number|String} number number to operate on\n     * @param {Number} fractionDigits number of fraction digits to \"leave\"\n     * @return {Number}\n     */\n    toFixed: function(number, fractionDigits) {\n      return parseFloat(Number(number).toFixed(fractionDigits));\n    },\n\n    /**\n     * Converts from attribute value to pixel value if applicable.\n     * Returns converted pixels or original value not converted.\n     * @param {Number|String} value number to operate on\n     * @param {Number} fontSize\n     * @return {Number|String}\n     */\n    parseUnit: function(value, fontSize) {\n      var unit = /\\D{0,2}$/.exec(value),\n          number = parseFloat(value);\n      if (!fontSize) {\n        fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;\n      }\n      switch (unit[0]) {\n        case 'mm':\n          return number * fabric.DPI / 25.4;\n\n        case 'cm':\n          return number * fabric.DPI / 2.54;\n\n        case 'in':\n          return number * fabric.DPI;\n\n        case 'pt':\n          return number * fabric.DPI / 72; // or * 4 / 3\n\n        case 'pc':\n          return number * fabric.DPI / 72 * 12; // or * 16\n\n        case 'em':\n          return number * fontSize;\n\n        default:\n          return number;\n      }\n    },\n\n    /**\n     * Function which always returns `false`.\n     * @static\n     * @memberOf fabric.util\n     * @return {Boolean}\n     */\n    falseFunction: function() {\n      return false;\n    },\n\n    /**\n     * Returns klass \"Class\" object of given namespace\n     * @memberOf fabric.util\n     * @param {String} type Type of object (eg. 'circle')\n     * @param {String} namespace Namespace to get klass \"Class\" object from\n     * @return {Object} klass \"Class\"\n     */\n    getKlass: function(type, namespace) {\n      // capitalize first letter only\n      type = fabric.util.string.camelize(type.charAt(0).toUpperCase() + type.slice(1));\n      return fabric.util.resolveNamespace(namespace)[type];\n    },\n\n    /**\n     * Returns array of attributes for given svg that fabric parses\n     * @memberOf fabric.util\n     * @param {String} type Type of svg element (eg. 'circle')\n     * @return {Array} string names of supported attributes\n     */\n    getSvgAttributes: function(type) {\n      var attributes = [\n        'instantiated_by_use',\n        'style',\n        'id',\n        'class'\n      ];\n      switch (type) {\n        case 'linearGradient':\n          attributes = attributes.concat(['x1', 'y1', 'x2', 'y2', 'gradientUnits', 'gradientTransform']);\n          break;\n        case 'radialGradient':\n          attributes = attributes.concat(['gradientUnits', 'gradientTransform', 'cx', 'cy', 'r', 'fx', 'fy', 'fr']);\n          break;\n        case 'stop':\n          attributes = attributes.concat(['offset', 'stop-color', 'stop-opacity']);\n          break;\n      }\n      return attributes;\n    },\n\n    /**\n     * Returns object of given namespace\n     * @memberOf fabric.util\n     * @param {String} namespace Namespace string e.g. 'fabric.Image.filter' or 'fabric'\n     * @return {Object} Object for given namespace (default fabric)\n     */\n    resolveNamespace: function(namespace) {\n      if (!namespace) {\n        return fabric;\n      }\n\n      var parts = namespace.split('.'),\n          len = parts.length, i,\n          obj = global || fabric.window;\n\n      for (i = 0; i < len; ++i) {\n        obj = obj[parts[i]];\n      }\n\n      return obj;\n    },\n\n    /**\n     * Loads image element from given url and passes it to a callback\n     * @memberOf fabric.util\n     * @param {String} url URL representing an image\n     * @param {Function} callback Callback; invoked with loaded image\n     * @param {*} [context] Context to invoke callback in\n     * @param {Object} [crossOrigin] crossOrigin value to set image element to\n     */\n    loadImage: function(url, callback, context, crossOrigin) {\n      if (!url) {\n        callback && callback.call(context, url);\n        return;\n      }\n\n      var img = fabric.util.createImage();\n\n      /** @ignore */\n      var onLoadCallback = function () {\n        callback && callback.call(context, img);\n        img = img.onload = img.onerror = null;\n      };\n\n      img.onload = onLoadCallback;\n      /** @ignore */\n      img.onerror = function() {\n        fabric.log('Error loading ' + img.src);\n        callback && callback.call(context, null, true);\n        img = img.onload = img.onerror = null;\n      };\n\n      // data-urls appear to be buggy with crossOrigin\n      // https://github.com/kangax/fabric.js/commit/d0abb90f1cd5c5ef9d2a94d3fb21a22330da3e0a#commitcomment-4513767\n      // see https://code.google.com/p/chromium/issues/detail?id=315152\n      //     https://bugzilla.mozilla.org/show_bug.cgi?id=935069\n      if (url.indexOf('data') !== 0 && crossOrigin) {\n        img.crossOrigin = crossOrigin;\n      }\n\n      // IE10 / IE11-Fix: SVG contents from data: URI\n      // will only be available if the IMG is present\n      // in the DOM (and visible)\n      if (url.substring(0,14) === 'data:image/svg') {\n        img.onload = null;\n        fabric.util.loadImageInDom(img, onLoadCallback);\n      }\n\n      img.src = url;\n    },\n\n    /**\n     * Attaches SVG image with data: URL to the dom\n     * @memberOf fabric.util\n     * @param {Object} img Image object with data:image/svg src\n     * @param {Function} callback Callback; invoked with loaded image\n     * @return {Object} DOM element (div containing the SVG image)\n     */\n    loadImageInDom: function(img, onLoadCallback) {\n      var div = fabric.document.createElement('div');\n      div.style.width = div.style.height = '1px';\n      div.style.left = div.style.top = '-100%';\n      div.style.position = 'absolute';\n      div.appendChild(img);\n      fabric.document.querySelector('body').appendChild(div);\n      /**\n       * Wrap in function to:\n       *   1. Call existing callback\n       *   2. Cleanup DOM\n       */\n      img.onload = function () {\n        onLoadCallback();\n        div.parentNode.removeChild(div);\n        div = null;\n      };\n    },\n\n    /**\n     * Creates corresponding fabric instances from their object representations\n     * @static\n     * @memberOf fabric.util\n     * @param {Array} objects Objects to enliven\n     * @param {Function} callback Callback to invoke when all objects are created\n     * @param {String} namespace Namespace to get klass \"Class\" object from\n     * @param {Function} reviver Method for further parsing of object elements,\n     * called after each fabric object created.\n     */\n    enlivenObjects: function(objects, callback, namespace, reviver) {\n      objects = objects || [];\n\n      var enlivenedObjects = [],\n          numLoadedObjects = 0,\n          numTotalObjects = objects.length;\n\n      function onLoaded() {\n        if (++numLoadedObjects === numTotalObjects) {\n          callback && callback(enlivenedObjects.filter(function(obj) {\n            // filter out undefined objects (objects that gave error)\n            return obj;\n          }));\n        }\n      }\n\n      if (!numTotalObjects) {\n        callback && callback(enlivenedObjects);\n        return;\n      }\n\n      objects.forEach(function (o, index) {\n        // if sparse array\n        if (!o || !o.type) {\n          onLoaded();\n          return;\n        }\n        var klass = fabric.util.getKlass(o.type, namespace);\n        klass.fromObject(o, function (obj, error) {\n          error || (enlivenedObjects[index] = obj);\n          reviver && reviver(o, obj, error);\n          onLoaded();\n        });\n      });\n    },\n\n    /**\n     * Create and wait for loading of patterns\n     * @static\n     * @memberOf fabric.util\n     * @param {Array} patterns Objects to enliven\n     * @param {Function} callback Callback to invoke when all objects are created\n     * called after each fabric object created.\n     */\n    enlivenPatterns: function(patterns, callback) {\n      patterns = patterns || [];\n\n      function onLoaded() {\n        if (++numLoadedPatterns === numPatterns) {\n          callback && callback(enlivenedPatterns);\n        }\n      }\n\n      var enlivenedPatterns = [],\n          numLoadedPatterns = 0,\n          numPatterns = patterns.length;\n\n      if (!numPatterns) {\n        callback && callback(enlivenedPatterns);\n        return;\n      }\n\n      patterns.forEach(function (p, index) {\n        if (p && p.source) {\n          new fabric.Pattern(p, function(pattern) {\n            enlivenedPatterns[index] = pattern;\n            onLoaded();\n          });\n        }\n        else {\n          enlivenedPatterns[index] = p;\n          onLoaded();\n        }\n      });\n    },\n\n    /**\n     * Groups SVG elements (usually those retrieved from SVG document)\n     * @static\n     * @memberOf fabric.util\n     * @param {Array} elements SVG elements to group\n     * @param {Object} [options] Options object\n     * @param {String} path Value to set sourcePath to\n     * @return {fabric.Object|fabric.Group}\n     */\n    groupSVGElements: function(elements, options, path) {\n      var object;\n      if (elements && elements.length === 1) {\n        return elements[0];\n      }\n      if (options) {\n        if (options.width && options.height) {\n          options.centerPoint = {\n            x: options.width / 2,\n            y: options.height / 2\n          };\n        }\n        else {\n          delete options.width;\n          delete options.height;\n        }\n      }\n      object = new fabric.Group(elements, options);\n      if (typeof path !== 'undefined') {\n        object.sourcePath = path;\n      }\n      return object;\n    },\n\n    /**\n     * Populates an object with properties of another object\n     * @static\n     * @memberOf fabric.util\n     * @param {Object} source Source object\n     * @param {Object} destination Destination object\n     * @return {Array} properties Properties names to include\n     */\n    populateWithProperties: function(source, destination, properties) {\n      if (properties && Object.prototype.toString.call(properties) === '[object Array]') {\n        for (var i = 0, len = properties.length; i < len; i++) {\n          if (properties[i] in source) {\n            destination[properties[i]] = source[properties[i]];\n          }\n        }\n      }\n    },\n\n    /**\n     * Draws a dashed line between two points\n     *\n     * This method is used to draw dashed line around selection area.\n     * See <a href=\"http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas\">dotted stroke in canvas</a>\n     *\n     * @param {CanvasRenderingContext2D} ctx context\n     * @param {Number} x  start x coordinate\n     * @param {Number} y start y coordinate\n     * @param {Number} x2 end x coordinate\n     * @param {Number} y2 end y coordinate\n     * @param {Array} da dash array pattern\n     */\n    drawDashedLine: function(ctx, x, y, x2, y2, da) {\n      var dx = x2 - x,\n          dy = y2 - y,\n          len = sqrt(dx * dx + dy * dy),\n          rot = atan2(dy, dx),\n          dc = da.length,\n          di = 0,\n          draw = true;\n\n      ctx.save();\n      ctx.translate(x, y);\n      ctx.moveTo(0, 0);\n      ctx.rotate(rot);\n\n      x = 0;\n      while (len > x) {\n        x += da[di++ % dc];\n        if (x > len) {\n          x = len;\n        }\n        ctx[draw ? 'lineTo' : 'moveTo'](x, 0);\n        draw = !draw;\n      }\n\n      ctx.restore();\n    },\n\n    /**\n     * Creates canvas element\n     * @static\n     * @memberOf fabric.util\n     * @return {CanvasElement} initialized canvas element\n     */\n    createCanvasElement: function() {\n      return fabric.document.createElement('canvas');\n    },\n\n    /**\n     * Creates a canvas element that is a copy of another and is also painted\n     * @param {CanvasElement} canvas to copy size and content of\n     * @static\n     * @memberOf fabric.util\n     * @return {CanvasElement} initialized canvas element\n     */\n    copyCanvasElement: function(canvas) {\n      var newCanvas = fabric.util.createCanvasElement();\n      newCanvas.width = canvas.width;\n      newCanvas.height = canvas.height;\n      newCanvas.getContext('2d').drawImage(canvas, 0, 0);\n      return newCanvas;\n    },\n\n    /**\n     * since 2.6.0 moved from canvas instance to utility.\n     * @param {CanvasElement} canvasEl to copy size and content of\n     * @param {String} format 'jpeg' or 'png', in some browsers 'webp' is ok too\n     * @param {Number} quality <= 1 and > 0\n     * @static\n     * @memberOf fabric.util\n     * @return {String} data url\n     */\n    toDataURL: function(canvasEl, format, quality) {\n      return canvasEl.toDataURL('image/' + format, quality);\n    },\n\n    /**\n     * Creates image element (works on client and node)\n     * @static\n     * @memberOf fabric.util\n     * @return {HTMLImageElement} HTML image element\n     */\n    createImage: function() {\n      return fabric.document.createElement('img');\n    },\n\n    /**\n     * @static\n     * @memberOf fabric.util\n     * @deprecated since 2.0.0\n     * @param {fabric.Object} receiver Object implementing `clipTo` method\n     * @param {CanvasRenderingContext2D} ctx Context to clip\n     */\n    clipContext: function(receiver, ctx) {\n      ctx.save();\n      ctx.beginPath();\n      receiver.clipTo(ctx);\n      ctx.clip();\n    },\n\n    /**\n     * Multiply matrix A by matrix B to nest transformations\n     * @static\n     * @memberOf fabric.util\n     * @param  {Array} a First transformMatrix\n     * @param  {Array} b Second transformMatrix\n     * @param  {Boolean} is2x2 flag to multiply matrices as 2x2 matrices\n     * @return {Array} The product of the two transform matrices\n     */\n    multiplyTransformMatrices: function(a, b, is2x2) {\n      // Matrix multiply a * b\n      return [\n        a[0] * b[0] + a[2] * b[1],\n        a[1] * b[0] + a[3] * b[1],\n        a[0] * b[2] + a[2] * b[3],\n        a[1] * b[2] + a[3] * b[3],\n        is2x2 ? 0 : a[0] * b[4] + a[2] * b[5] + a[4],\n        is2x2 ? 0 : a[1] * b[4] + a[3] * b[5] + a[5]\n      ];\n    },\n\n    /**\n     * Decomposes standard 2x2 matrix into transform componentes\n     * @static\n     * @memberOf fabric.util\n     * @param  {Array} a transformMatrix\n     * @return {Object} Components of transform\n     */\n    qrDecompose: function(a) {\n      var angle = atan2(a[1], a[0]),\n          denom = pow(a[0], 2) + pow(a[1], 2),\n          scaleX = sqrt(denom),\n          scaleY = (a[0] * a[3] - a[2] * a [1]) / scaleX,\n          skewX = atan2(a[0] * a[2] + a[1] * a [3], denom);\n      return {\n        angle: angle  / PiBy180,\n        scaleX: scaleX,\n        scaleY: scaleY,\n        skewX: skewX / PiBy180,\n        skewY: 0,\n        translateX: a[4],\n        translateY: a[5]\n      };\n    },\n\n    customTransformMatrix: function(scaleX, scaleY, skewX) {\n      var skewMatrixX = [1, 0, abs(Math.tan(skewX * PiBy180)), 1],\n          scaleMatrix = [abs(scaleX), 0, 0, abs(scaleY)];\n      return fabric.util.multiplyTransformMatrices(scaleMatrix, skewMatrixX, true);\n    },\n\n    /**\n     * reset an object transform state to neutral. Top and left are not accounted for\n     * @static\n     * @memberOf fabric.util\n     * @param  {fabric.Object} target object to transform\n     */\n    resetObjectTransform: function (target) {\n      target.scaleX = 1;\n      target.scaleY = 1;\n      target.skewX = 0;\n      target.skewY = 0;\n      target.flipX = false;\n      target.flipY = false;\n      target.rotate(0);\n    },\n\n    /**\n     * Extract Object transform values\n     * @static\n     * @memberOf fabric.util\n     * @param  {fabric.Object} target object to read from\n     * @return {Object} Components of transform\n     */\n    saveObjectTransform: function (target) {\n      return {\n        scaleX: target.scaleX,\n        scaleY: target.scaleY,\n        skewX: target.skewX,\n        skewY: target.skewY,\n        angle: target.angle,\n        left: target.left,\n        flipX: target.flipX,\n        flipY: target.flipY,\n        top: target.top\n      };\n    },\n\n    /**\n     * Returns string representation of function body\n     * @param {Function} fn Function to get body of\n     * @return {String} Function body\n     */\n    getFunctionBody: function(fn) {\n      return (String(fn).match(/function[^{]*\\{([\\s\\S]*)\\}/) || {})[1];\n    },\n\n    /**\n     * Returns true if context has transparent pixel\n     * at specified location (taking tolerance into account)\n     * @param {CanvasRenderingContext2D} ctx context\n     * @param {Number} x x coordinate\n     * @param {Number} y y coordinate\n     * @param {Number} tolerance Tolerance\n     */\n    isTransparent: function(ctx, x, y, tolerance) {\n\n      // If tolerance is > 0 adjust start coords to take into account.\n      // If moves off Canvas fix to 0\n      if (tolerance > 0) {\n        if (x > tolerance) {\n          x -= tolerance;\n        }\n        else {\n          x = 0;\n        }\n        if (y > tolerance) {\n          y -= tolerance;\n        }\n        else {\n          y = 0;\n        }\n      }\n\n      var _isTransparent = true, i, temp,\n          imageData = ctx.getImageData(x, y, (tolerance * 2) || 1, (tolerance * 2) || 1),\n          l = imageData.data.length;\n\n      // Split image data - for tolerance > 1, pixelDataSize = 4;\n      for (i = 3; i < l; i += 4) {\n        temp = imageData.data[i];\n        _isTransparent = temp <= 0;\n        if (_isTransparent === false) {\n          break; // Stop if colour found\n        }\n      }\n\n      imageData = null;\n\n      return _isTransparent;\n    },\n\n    /**\n     * Parse preserveAspectRatio attribute from element\n     * @param {string} attribute to be parsed\n     * @return {Object} an object containing align and meetOrSlice attribute\n     */\n    parsePreserveAspectRatioAttribute: function(attribute) {\n      var meetOrSlice = 'meet', alignX = 'Mid', alignY = 'Mid',\n          aspectRatioAttrs = attribute.split(' '), align;\n\n      if (aspectRatioAttrs && aspectRatioAttrs.length) {\n        meetOrSlice = aspectRatioAttrs.pop();\n        if (meetOrSlice !== 'meet' && meetOrSlice !== 'slice') {\n          align = meetOrSlice;\n          meetOrSlice = 'meet';\n        }\n        else if (aspectRatioAttrs.length) {\n          align = aspectRatioAttrs.pop();\n        }\n      }\n      //divide align in alignX and alignY\n      alignX = align !== 'none' ? align.slice(1, 4) : 'none';\n      alignY = align !== 'none' ? align.slice(5, 8) : 'none';\n      return {\n        meetOrSlice: meetOrSlice,\n        alignX: alignX,\n        alignY: alignY\n      };\n    },\n\n    /**\n     * Clear char widths cache for the given font family or all the cache if no\n     * fontFamily is specified.\n     * Use it if you know you are loading fonts in a lazy way and you are not waiting\n     * for custom fonts to load properly when adding text objects to the canvas.\n     * If a text object is added when its own font is not loaded yet, you will get wrong\n     * measurement and so wrong bounding boxes.\n     * After the font cache is cleared, either change the textObject text content or call\n     * initDimensions() to trigger a recalculation\n     * @memberOf fabric.util\n     * @param {String} [fontFamily] font family to clear\n     */\n    clearFabricFontCache: function(fontFamily) {\n      fontFamily = (fontFamily || '').toLowerCase();\n      if (!fontFamily) {\n        fabric.charWidthsCache = { };\n      }\n      else if (fabric.charWidthsCache[fontFamily]) {\n        delete fabric.charWidthsCache[fontFamily];\n      }\n    },\n\n    /**\n     * Given current aspect ratio, determines the max width and height that can\n     * respect the total allowed area for the cache.\n     * @memberOf fabric.util\n     * @param {Number} ar aspect ratio\n     * @param {Number} maximumArea Maximum area you want to achieve\n     * @return {Object.x} Limited dimensions by X\n     * @return {Object.y} Limited dimensions by Y\n     */\n    limitDimsByArea: function(ar, maximumArea) {\n      var roughWidth = Math.sqrt(maximumArea * ar),\n          perfLimitSizeY = Math.floor(maximumArea / roughWidth);\n      return { x: Math.floor(roughWidth), y: perfLimitSizeY };\n    },\n\n    capValue: function(min, value, max) {\n      return Math.max(min, Math.min(value, max));\n    },\n\n    findScaleToFit: function(source, destination) {\n      return Math.min(destination.width / source.width, destination.height / source.height);\n    },\n\n    findScaleToCover: function(source, destination) {\n      return Math.max(destination.width / source.width, destination.height / source.height);\n    },\n\n    /**\n     * given an array of 6 number returns something like `\"matrix(...numbers)\"`\n     * @memberOf fabric.util\n     * @param {Array} trasnform an array with 6 numbers\n     * @return {String} transform matrix for svg\n     * @return {Object.y} Limited dimensions by Y\n     */\n    matrixToSVG: function(transform) {\n      return 'matrix(' + transform.map(function(value) {\n        return fabric.util.toFixed(value, fabric.Object.NUM_FRACTION_DIGITS);\n      }).join(' ') + ')';\n    }\n  };\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n  var _join = Array.prototype.join;\n\n  /* Adapted from http://dxr.mozilla.org/mozilla-central/source/content/svg/content/src/nsSVGPathDataParser.cpp\n   * by Andrea Bogazzi code is under MPL. if you don't have a copy of the license you can take it here\n   * http://mozilla.org/MPL/2.0/\n   */\n  function arcToSegments(toX, toY, rx, ry, large, sweep, rotateX) {\n    var argsString = _join.call(arguments);\n    if (fabric.arcToSegmentsCache[argsString]) {\n      return fabric.arcToSegmentsCache[argsString];\n    }\n\n    var PI = Math.PI, th = rotateX * PI / 180,\n        sinTh = fabric.util.sin(th),\n        cosTh = fabric.util.cos(th),\n        fromX = 0, fromY = 0;\n\n    rx = Math.abs(rx);\n    ry = Math.abs(ry);\n\n    var px = -cosTh * toX * 0.5 - sinTh * toY * 0.5,\n        py = -cosTh * toY * 0.5 + sinTh * toX * 0.5,\n        rx2 = rx * rx, ry2 = ry * ry, py2 = py * py, px2 = px * px,\n        pl = rx2 * ry2 - rx2 * py2 - ry2 * px2,\n        root = 0;\n\n    if (pl < 0) {\n      var s = Math.sqrt(1 - pl / (rx2 * ry2));\n      rx *= s;\n      ry *= s;\n    }\n    else {\n      root = (large === sweep ? -1.0 : 1.0) *\n              Math.sqrt( pl / (rx2 * py2 + ry2 * px2));\n    }\n\n    var cx = root * rx * py / ry,\n        cy = -root * ry * px / rx,\n        cx1 = cosTh * cx - sinTh * cy + toX * 0.5,\n        cy1 = sinTh * cx + cosTh * cy + toY * 0.5,\n        mTheta = calcVectorAngle(1, 0, (px - cx) / rx, (py - cy) / ry),\n        dtheta = calcVectorAngle((px - cx) / rx, (py - cy) / ry, (-px - cx) / rx, (-py - cy) / ry);\n\n    if (sweep === 0 && dtheta > 0) {\n      dtheta -= 2 * PI;\n    }\n    else if (sweep === 1 && dtheta < 0) {\n      dtheta += 2 * PI;\n    }\n\n    // Convert into cubic bezier segments <= 90deg\n    var segments = Math.ceil(Math.abs(dtheta / PI * 2)),\n        result = [], mDelta = dtheta / segments,\n        mT = 8 / 3 * Math.sin(mDelta / 4) * Math.sin(mDelta / 4) / Math.sin(mDelta / 2),\n        th3 = mTheta + mDelta;\n\n    for (var i = 0; i < segments; i++) {\n      result[i] = segmentToBezier(mTheta, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY);\n      fromX = result[i][4];\n      fromY = result[i][5];\n      mTheta = th3;\n      th3 += mDelta;\n    }\n    fabric.arcToSegmentsCache[argsString] = result;\n    return result;\n  }\n\n  function segmentToBezier(th2, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY) {\n    var costh2 = fabric.util.cos(th2),\n        sinth2 = fabric.util.sin(th2),\n        costh3 = fabric.util.cos(th3),\n        sinth3 = fabric.util.sin(th3),\n        toX = cosTh * rx * costh3 - sinTh * ry * sinth3 + cx1,\n        toY = sinTh * rx * costh3 + cosTh * ry * sinth3 + cy1,\n        cp1X = fromX + mT * ( -cosTh * rx * sinth2 - sinTh * ry * costh2),\n        cp1Y = fromY + mT * ( -sinTh * rx * sinth2 + cosTh * ry * costh2),\n        cp2X = toX + mT * ( cosTh * rx * sinth3 + sinTh * ry * costh3),\n        cp2Y = toY + mT * ( sinTh * rx * sinth3 - cosTh * ry * costh3);\n\n    return [\n      cp1X, cp1Y,\n      cp2X, cp2Y,\n      toX, toY\n    ];\n  }\n\n  /*\n   * Private\n   */\n  function calcVectorAngle(ux, uy, vx, vy) {\n    var ta = Math.atan2(uy, ux),\n        tb = Math.atan2(vy, vx);\n    if (tb >= ta) {\n      return tb - ta;\n    }\n    else {\n      return 2 * Math.PI - (ta - tb);\n    }\n  }\n\n  /**\n   * Draws arc\n   * @param {CanvasRenderingContext2D} ctx\n   * @param {Number} fx\n   * @param {Number} fy\n   * @param {Array} coords\n   */\n  fabric.util.drawArc = function(ctx, fx, fy, coords) {\n    var rx = coords[0],\n        ry = coords[1],\n        rot = coords[2],\n        large = coords[3],\n        sweep = coords[4],\n        tx = coords[5],\n        ty = coords[6],\n        segs = [[], [], [], []],\n        segsNorm = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n    for (var i = 0, len = segsNorm.length; i < len; i++) {\n      segs[i][0] = segsNorm[i][0] + fx;\n      segs[i][1] = segsNorm[i][1] + fy;\n      segs[i][2] = segsNorm[i][2] + fx;\n      segs[i][3] = segsNorm[i][3] + fy;\n      segs[i][4] = segsNorm[i][4] + fx;\n      segs[i][5] = segsNorm[i][5] + fy;\n      ctx.bezierCurveTo.apply(ctx, segs[i]);\n    }\n  };\n\n  /**\n   * Calculate bounding box of a elliptic-arc\n   * @param {Number} fx start point of arc\n   * @param {Number} fy\n   * @param {Number} rx horizontal radius\n   * @param {Number} ry vertical radius\n   * @param {Number} rot angle of horizontal axe\n   * @param {Number} large 1 or 0, whatever the arc is the big or the small on the 2 points\n   * @param {Number} sweep 1 or 0, 1 clockwise or counterclockwise direction\n   * @param {Number} tx end point of arc\n   * @param {Number} ty\n   */\n  fabric.util.getBoundsOfArc = function(fx, fy, rx, ry, rot, large, sweep, tx, ty) {\n\n    var fromX = 0, fromY = 0, bound, bounds = [],\n        segs = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n    for (var i = 0, len = segs.length; i < len; i++) {\n      bound = getBoundsOfCurve(fromX, fromY, segs[i][0], segs[i][1], segs[i][2], segs[i][3], segs[i][4], segs[i][5]);\n      bounds.push({ x: bound[0].x + fx, y: bound[0].y + fy });\n      bounds.push({ x: bound[1].x + fx, y: bound[1].y + fy });\n      fromX = segs[i][4];\n      fromY = segs[i][5];\n    }\n    return bounds;\n  };\n\n  /**\n   * Calculate bounding box of a beziercurve\n   * @param {Number} x0 starting point\n   * @param {Number} y0\n   * @param {Number} x1 first control point\n   * @param {Number} y1\n   * @param {Number} x2 secondo control point\n   * @param {Number} y2\n   * @param {Number} x3 end of beizer\n   * @param {Number} y3\n   */\n  // taken from http://jsbin.com/ivomiq/56/edit  no credits available for that.\n  function getBoundsOfCurve(x0, y0, x1, y1, x2, y2, x3, y3) {\n    var argsString;\n    if (fabric.cachesBoundsOfCurve) {\n      argsString = _join.call(arguments);\n      if (fabric.boundsOfCurveCache[argsString]) {\n        return fabric.boundsOfCurveCache[argsString];\n      }\n    }\n\n    var sqrt = Math.sqrt,\n        min = Math.min, max = Math.max,\n        abs = Math.abs, tvalues = [],\n        bounds = [[], []],\n        a, b, c, t, t1, t2, b2ac, sqrtb2ac;\n\n    b = 6 * x0 - 12 * x1 + 6 * x2;\n    a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3;\n    c = 3 * x1 - 3 * x0;\n\n    for (var i = 0; i < 2; ++i) {\n      if (i > 0) {\n        b = 6 * y0 - 12 * y1 + 6 * y2;\n        a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3;\n        c = 3 * y1 - 3 * y0;\n      }\n\n      if (abs(a) < 1e-12) {\n        if (abs(b) < 1e-12) {\n          continue;\n        }\n        t = -c / b;\n        if (0 < t && t < 1) {\n          tvalues.push(t);\n        }\n        continue;\n      }\n      b2ac = b * b - 4 * c * a;\n      if (b2ac < 0) {\n        continue;\n      }\n      sqrtb2ac = sqrt(b2ac);\n      t1 = (-b + sqrtb2ac) / (2 * a);\n      if (0 < t1 && t1 < 1) {\n        tvalues.push(t1);\n      }\n      t2 = (-b - sqrtb2ac) / (2 * a);\n      if (0 < t2 && t2 < 1) {\n        tvalues.push(t2);\n      }\n    }\n\n    var x, y, j = tvalues.length, jlen = j, mt;\n    while (j--) {\n      t = tvalues[j];\n      mt = 1 - t;\n      x = (mt * mt * mt * x0) + (3 * mt * mt * t * x1) + (3 * mt * t * t * x2) + (t * t * t * x3);\n      bounds[0][j] = x;\n\n      y = (mt * mt * mt * y0) + (3 * mt * mt * t * y1) + (3 * mt * t * t * y2) + (t * t * t * y3);\n      bounds[1][j] = y;\n    }\n\n    bounds[0][jlen] = x0;\n    bounds[1][jlen] = y0;\n    bounds[0][jlen + 1] = x3;\n    bounds[1][jlen + 1] = y3;\n    var result = [\n      {\n        x: min.apply(null, bounds[0]),\n        y: min.apply(null, bounds[1])\n      },\n      {\n        x: max.apply(null, bounds[0]),\n        y: max.apply(null, bounds[1])\n      }\n    ];\n    if (fabric.cachesBoundsOfCurve) {\n      fabric.boundsOfCurveCache[argsString] = result;\n    }\n    return result;\n  }\n\n  fabric.util.getBoundsOfCurve = getBoundsOfCurve;\n\n})();\n\n\n(function() {\n\n  var slice = Array.prototype.slice;\n\n  /**\n   * Invokes method on all items in a given array\n   * @memberOf fabric.util.array\n   * @param {Array} array Array to iterate over\n   * @param {String} method Name of a method to invoke\n   * @return {Array}\n   */\n  function invoke(array, method) {\n    var args = slice.call(arguments, 2), result = [];\n    for (var i = 0, len = array.length; i < len; i++) {\n      result[i] = args.length ? array[i][method].apply(array[i], args) : array[i][method].call(array[i]);\n    }\n    return result;\n  }\n\n  /**\n   * Finds maximum value in array (not necessarily \"first\" one)\n   * @memberOf fabric.util.array\n   * @param {Array} array Array to iterate over\n   * @param {String} byProperty\n   * @return {*}\n   */\n  function max(array, byProperty) {\n    return find(array, byProperty, function(value1, value2) {\n      return value1 >= value2;\n    });\n  }\n\n  /**\n   * Finds minimum value in array (not necessarily \"first\" one)\n   * @memberOf fabric.util.array\n   * @param {Array} array Array to iterate over\n   * @param {String} byProperty\n   * @return {*}\n   */\n  function min(array, byProperty) {\n    return find(array, byProperty, function(value1, value2) {\n      return value1 < value2;\n    });\n  }\n\n  /**\n   * @private\n   */\n  function fill(array, value) {\n    var k = array.length;\n    while (k--) {\n      array[k] = value;\n    }\n    return array;\n  }\n\n  /**\n   * @private\n   */\n  function find(array, byProperty, condition) {\n    if (!array || array.length === 0) {\n      return;\n    }\n\n    var i = array.length - 1,\n        result = byProperty ? array[i][byProperty] : array[i];\n    if (byProperty) {\n      while (i--) {\n        if (condition(array[i][byProperty], result)) {\n          result = array[i][byProperty];\n        }\n      }\n    }\n    else {\n      while (i--) {\n        if (condition(array[i], result)) {\n          result = array[i];\n        }\n      }\n    }\n    return result;\n  }\n\n  /**\n   * @namespace fabric.util.array\n   */\n  fabric.util.array = {\n    fill: fill,\n    invoke: invoke,\n    min: min,\n    max: max\n  };\n\n})();\n\n\n(function() {\n  /**\n   * Copies all enumerable properties of one js object to another\n   * this does not and cannot compete with generic utils.\n   * Does not clone or extend fabric.Object subclasses.\n   * This is mostly for internal use and has extra handling for fabricJS objects\n   * it skips the canvas property in deep cloning.\n   * @memberOf fabric.util.object\n   * @param {Object} destination Where to copy to\n   * @param {Object} source Where to copy from\n   * @return {Object}\n   */\n\n  function extend(destination, source, deep) {\n    // JScript DontEnum bug is not taken care of\n    // the deep clone is for internal use, is not meant to avoid\n    // javascript traps or cloning html element or self referenced objects.\n    if (deep) {\n      if (!fabric.isLikelyNode && source instanceof Element) {\n        // avoid cloning deep images, canvases,\n        destination = source;\n      }\n      else if (source instanceof Array) {\n        destination = [];\n        for (var i = 0, len = source.length; i < len; i++) {\n          destination[i] = extend({ }, source[i], deep);\n        }\n      }\n      else if (source && typeof source === 'object') {\n        for (var property in source) {\n          if (property === 'canvas') {\n            destination[property] = extend({ }, source[property]);\n          }\n          else if (source.hasOwnProperty(property)) {\n            destination[property] = extend({ }, source[property], deep);\n          }\n        }\n      }\n      else {\n        // this sounds odd for an extend but is ok for recursive use\n        destination = source;\n      }\n    }\n    else {\n      for (var property in source) {\n        destination[property] = source[property];\n      }\n    }\n    return destination;\n  }\n\n  /**\n   * Creates an empty object and copies all enumerable properties of another object to it\n   * @memberOf fabric.util.object\n   * TODO: this function return an empty object if you try to clone null\n   * @param {Object} object Object to clone\n   * @return {Object}\n   */\n  function clone(object, deep) {\n    return extend({ }, object, deep);\n  }\n\n  /** @namespace fabric.util.object */\n  fabric.util.object = {\n    extend: extend,\n    clone: clone\n  };\n  fabric.util.object.extend(fabric.util, fabric.Observable);\n})();\n\n\n(function() {\n\n  /**\n   * Camelizes a string\n   * @memberOf fabric.util.string\n   * @param {String} string String to camelize\n   * @return {String} Camelized version of a string\n   */\n  function camelize(string) {\n    return string.replace(/-+(.)?/g, function(match, character) {\n      return character ? character.toUpperCase() : '';\n    });\n  }\n\n  /**\n   * Capitalizes a string\n   * @memberOf fabric.util.string\n   * @param {String} string String to capitalize\n   * @param {Boolean} [firstLetterOnly] If true only first letter is capitalized\n   * and other letters stay untouched, if false first letter is capitalized\n   * and other letters are converted to lowercase.\n   * @return {String} Capitalized version of a string\n   */\n  function capitalize(string, firstLetterOnly) {\n    return string.charAt(0).toUpperCase() +\n      (firstLetterOnly ? string.slice(1) : string.slice(1).toLowerCase());\n  }\n\n  /**\n   * Escapes XML in a string\n   * @memberOf fabric.util.string\n   * @param {String} string String to escape\n   * @return {String} Escaped version of a string\n   */\n  function escapeXml(string) {\n    return string.replace(/&/g, '&amp;')\n      .replace(/\"/g, '&quot;')\n      .replace(/'/g, '&apos;')\n      .replace(/</g, '&lt;')\n      .replace(/>/g, '&gt;');\n  }\n\n  /**\n   * Divide a string in the user perceived single units\n   * @memberOf fabric.util.string\n   * @param {String} textstring String to escape\n   * @return {Array} array containing the graphemes\n   */\n  function graphemeSplit(textstring) {\n    var i = 0, chr, graphemes = [];\n    for (i = 0, chr; i < textstring.length; i++) {\n      if ((chr = getWholeChar(textstring, i)) === false) {\n        continue;\n      }\n      graphemes.push(chr);\n    }\n    return graphemes;\n  }\n\n  // taken from mdn in the charAt doc page.\n  function getWholeChar(str, i) {\n    var code = str.charCodeAt(i);\n\n    if (isNaN(code)) {\n      return ''; // Position not found\n    }\n    if (code < 0xD800 || code > 0xDFFF) {\n      return str.charAt(i);\n    }\n\n    // High surrogate (could change last hex to 0xDB7F to treat high private\n    // surrogates as single characters)\n    if (0xD800 <= code && code <= 0xDBFF) {\n      if (str.length <= (i + 1)) {\n        throw 'High surrogate without following low surrogate';\n      }\n      var next = str.charCodeAt(i + 1);\n      if (0xDC00 > next || next > 0xDFFF) {\n        throw 'High surrogate without following low surrogate';\n      }\n      return str.charAt(i) + str.charAt(i + 1);\n    }\n    // Low surrogate (0xDC00 <= code && code <= 0xDFFF)\n    if (i === 0) {\n      throw 'Low surrogate without preceding high surrogate';\n    }\n    var prev = str.charCodeAt(i - 1);\n\n    // (could change last hex to 0xDB7F to treat high private\n    // surrogates as single characters)\n    if (0xD800 > prev || prev > 0xDBFF) {\n      throw 'Low surrogate without preceding high surrogate';\n    }\n    // We can pass over low surrogates now as the second component\n    // in a pair which we have already processed\n    return false;\n  }\n\n\n  /**\n   * String utilities\n   * @namespace fabric.util.string\n   */\n  fabric.util.string = {\n    camelize: camelize,\n    capitalize: capitalize,\n    escapeXml: escapeXml,\n    graphemeSplit: graphemeSplit\n  };\n})();\n\n\n(function() {\n\n  var slice = Array.prototype.slice, emptyFunction = function() { },\n\n      IS_DONTENUM_BUGGY = (function() {\n        for (var p in { toString: 1 }) {\n          if (p === 'toString') {\n            return false;\n          }\n        }\n        return true;\n      })(),\n\n      /** @ignore */\n      addMethods = function(klass, source, parent) {\n        for (var property in source) {\n\n          if (property in klass.prototype &&\n              typeof klass.prototype[property] === 'function' &&\n              (source[property] + '').indexOf('callSuper') > -1) {\n\n            klass.prototype[property] = (function(property) {\n              return function() {\n\n                var superclass = this.constructor.superclass;\n                this.constructor.superclass = parent;\n                var returnValue = source[property].apply(this, arguments);\n                this.constructor.superclass = superclass;\n\n                if (property !== 'initialize') {\n                  return returnValue;\n                }\n              };\n            })(property);\n          }\n          else {\n            klass.prototype[property] = source[property];\n          }\n\n          if (IS_DONTENUM_BUGGY) {\n            if (source.toString !== Object.prototype.toString) {\n              klass.prototype.toString = source.toString;\n            }\n            if (source.valueOf !== Object.prototype.valueOf) {\n              klass.prototype.valueOf = source.valueOf;\n            }\n          }\n        }\n      };\n\n  function Subclass() { }\n\n  function callSuper(methodName) {\n    var parentMethod = null,\n        _this = this;\n\n    // climb prototype chain to find method not equal to callee's method\n    while (_this.constructor.superclass) {\n      var superClassMethod = _this.constructor.superclass.prototype[methodName];\n      if (_this[methodName] !== superClassMethod) {\n        parentMethod = superClassMethod;\n        break;\n      }\n      // eslint-disable-next-line\n      _this = _this.constructor.superclass.prototype;\n    }\n\n    if (!parentMethod) {\n      return console.log('tried to callSuper ' + methodName + ', method not found in prototype chain', this);\n    }\n\n    return (arguments.length > 1)\n      ? parentMethod.apply(this, slice.call(arguments, 1))\n      : parentMethod.call(this);\n  }\n\n  /**\n   * Helper for creation of \"classes\".\n   * @memberOf fabric.util\n   * @param {Function} [parent] optional \"Class\" to inherit from\n   * @param {Object} [properties] Properties shared by all instances of this class\n   *                  (be careful modifying objects defined here as this would affect all instances)\n   */\n  function createClass() {\n    var parent = null,\n        properties = slice.call(arguments, 0);\n\n    if (typeof properties[0] === 'function') {\n      parent = properties.shift();\n    }\n    function klass() {\n      this.initialize.apply(this, arguments);\n    }\n\n    klass.superclass = parent;\n    klass.subclasses = [];\n\n    if (parent) {\n      Subclass.prototype = parent.prototype;\n      klass.prototype = new Subclass();\n      parent.subclasses.push(klass);\n    }\n    for (var i = 0, length = properties.length; i < length; i++) {\n      addMethods(klass, properties[i], parent);\n    }\n    if (!klass.prototype.initialize) {\n      klass.prototype.initialize = emptyFunction;\n    }\n    klass.prototype.constructor = klass;\n    klass.prototype.callSuper = callSuper;\n    return klass;\n  }\n\n  fabric.util.createClass = createClass;\n})();\n\n\n(function () {\n  // since ie10 or ie9 can use addEventListener but they do not support options, i need to check\n  var couldUseAttachEvent = !!fabric.document.createElement('div').attachEvent;\n  /**\n   * Adds an event listener to an element\n   * @function\n   * @memberOf fabric.util\n   * @param {HTMLElement} element\n   * @param {String} eventName\n   * @param {Function} handler\n   */\n  fabric.util.addListener = function(element, eventName, handler, options) {\n    element && element.addEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n  };\n\n  /**\n   * Removes an event listener from an element\n   * @function\n   * @memberOf fabric.util\n   * @param {HTMLElement} element\n   * @param {String} eventName\n   * @param {Function} handler\n   */\n  fabric.util.removeListener = function(element, eventName, handler, options) {\n    element && element.removeEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n  };\n\n  function getTouchInfo(event) {\n    var touchProp = event.changedTouches;\n    if (touchProp && touchProp[0]) {\n      return touchProp[0];\n    }\n    return event;\n  }\n\n  fabric.util.getPointer = function(event) {\n    var element = event.target,\n        scroll = fabric.util.getScrollLeftTop(element),\n        _evt = getTouchInfo(event);\n    return {\n      x: _evt.clientX + scroll.left,\n      y: _evt.clientY + scroll.top\n    };\n  };\n})();\n\n\n(function () {\n\n  /**\n   * Cross-browser wrapper for setting element's style\n   * @memberOf fabric.util\n   * @param {HTMLElement} element\n   * @param {Object} styles\n   * @return {HTMLElement} Element that was passed as a first argument\n   */\n  function setStyle(element, styles) {\n    var elementStyle = element.style;\n    if (!elementStyle) {\n      return element;\n    }\n    if (typeof styles === 'string') {\n      element.style.cssText += ';' + styles;\n      return styles.indexOf('opacity') > -1\n        ? setOpacity(element, styles.match(/opacity:\\s*(\\d?\\.?\\d*)/)[1])\n        : element;\n    }\n    for (var property in styles) {\n      if (property === 'opacity') {\n        setOpacity(element, styles[property]);\n      }\n      else {\n        var normalizedProperty = (property === 'float' || property === 'cssFloat')\n          ? (typeof elementStyle.styleFloat === 'undefined' ? 'cssFloat' : 'styleFloat')\n          : property;\n        elementStyle[normalizedProperty] = styles[property];\n      }\n    }\n    return element;\n  }\n\n  var parseEl = fabric.document.createElement('div'),\n      supportsOpacity = typeof parseEl.style.opacity === 'string',\n      supportsFilters = typeof parseEl.style.filter === 'string',\n      reOpacity = /alpha\\s*\\(\\s*opacity\\s*=\\s*([^\\)]+)\\)/,\n\n      /** @ignore */\n      setOpacity = function (element) { return element; };\n\n  if (supportsOpacity) {\n    /** @ignore */\n    setOpacity = function(element, value) {\n      element.style.opacity = value;\n      return element;\n    };\n  }\n  else if (supportsFilters) {\n    /** @ignore */\n    setOpacity = function(element, value) {\n      var es = element.style;\n      if (element.currentStyle && !element.currentStyle.hasLayout) {\n        es.zoom = 1;\n      }\n      if (reOpacity.test(es.filter)) {\n        value = value >= 0.9999 ? '' : ('alpha(opacity=' + (value * 100) + ')');\n        es.filter = es.filter.replace(reOpacity, value);\n      }\n      else {\n        es.filter += ' alpha(opacity=' + (value * 100) + ')';\n      }\n      return element;\n    };\n  }\n\n  fabric.util.setStyle = setStyle;\n\n})();\n\n\n(function() {\n\n  var _slice = Array.prototype.slice;\n\n  /**\n   * Takes id and returns an element with that id (if one exists in a document)\n   * @memberOf fabric.util\n   * @param {String|HTMLElement} id\n   * @return {HTMLElement|null}\n   */\n  function getById(id) {\n    return typeof id === 'string' ? fabric.document.getElementById(id) : id;\n  }\n\n  var sliceCanConvertNodelists,\n      /**\n       * Converts an array-like object (e.g. arguments or NodeList) to an array\n       * @memberOf fabric.util\n       * @param {Object} arrayLike\n       * @return {Array}\n       */\n      toArray = function(arrayLike) {\n        return _slice.call(arrayLike, 0);\n      };\n\n  try {\n    sliceCanConvertNodelists = toArray(fabric.document.childNodes) instanceof Array;\n  }\n  catch (err) { }\n\n  if (!sliceCanConvertNodelists) {\n    toArray = function(arrayLike) {\n      var arr = new Array(arrayLike.length), i = arrayLike.length;\n      while (i--) {\n        arr[i] = arrayLike[i];\n      }\n      return arr;\n    };\n  }\n\n  /**\n   * Creates specified element with specified attributes\n   * @memberOf fabric.util\n   * @param {String} tagName Type of an element to create\n   * @param {Object} [attributes] Attributes to set on an element\n   * @return {HTMLElement} Newly created element\n   */\n  function makeElement(tagName, attributes) {\n    var el = fabric.document.createElement(tagName);\n    for (var prop in attributes) {\n      if (prop === 'class') {\n        el.className = attributes[prop];\n      }\n      else if (prop === 'for') {\n        el.htmlFor = attributes[prop];\n      }\n      else {\n        el.setAttribute(prop, attributes[prop]);\n      }\n    }\n    return el;\n  }\n\n  /**\n   * Adds class to an element\n   * @memberOf fabric.util\n   * @param {HTMLElement} element Element to add class to\n   * @param {String} className Class to add to an element\n   */\n  function addClass(element, className) {\n    if (element && (' ' + element.className + ' ').indexOf(' ' + className + ' ') === -1) {\n      element.className += (element.className ? ' ' : '') + className;\n    }\n  }\n\n  /**\n   * Wraps element with another element\n   * @memberOf fabric.util\n   * @param {HTMLElement} element Element to wrap\n   * @param {HTMLElement|String} wrapper Element to wrap with\n   * @param {Object} [attributes] Attributes to set on a wrapper\n   * @return {HTMLElement} wrapper\n   */\n  function wrapElement(element, wrapper, attributes) {\n    if (typeof wrapper === 'string') {\n      wrapper = makeElement(wrapper, attributes);\n    }\n    if (element.parentNode) {\n      element.parentNode.replaceChild(wrapper, element);\n    }\n    wrapper.appendChild(element);\n    return wrapper;\n  }\n\n  /**\n   * Returns element scroll offsets\n   * @memberOf fabric.util\n   * @param {HTMLElement} element Element to operate on\n   * @return {Object} Object with left/top values\n   */\n  function getScrollLeftTop(element) {\n\n    var left = 0,\n        top = 0,\n        docElement = fabric.document.documentElement,\n        body = fabric.document.body || {\n          scrollLeft: 0, scrollTop: 0\n        };\n\n    // While loop checks (and then sets element to) .parentNode OR .host\n    //  to account for ShadowDOM. We still want to traverse up out of ShadowDOM,\n    //  but the .parentNode of a root ShadowDOM node will always be null, instead\n    //  it should be accessed through .host. See http://stackoverflow.com/a/24765528/4383938\n    while (element && (element.parentNode || element.host)) {\n\n      // Set element to element parent, or 'host' in case of ShadowDOM\n      element = element.parentNode || element.host;\n\n      if (element === fabric.document) {\n        left = body.scrollLeft || docElement.scrollLeft || 0;\n        top = body.scrollTop ||  docElement.scrollTop || 0;\n      }\n      else {\n        left += element.scrollLeft || 0;\n        top += element.scrollTop || 0;\n      }\n\n      if (element.nodeType === 1 && element.style.position === 'fixed') {\n        break;\n      }\n    }\n\n    return { left: left, top: top };\n  }\n\n  /**\n   * Returns offset for a given element\n   * @function\n   * @memberOf fabric.util\n   * @param {HTMLElement} element Element to get offset for\n   * @return {Object} Object with \"left\" and \"top\" properties\n   */\n  function getElementOffset(element) {\n    var docElem,\n        doc = element && element.ownerDocument,\n        box = { left: 0, top: 0 },\n        offset = { left: 0, top: 0 },\n        scrollLeftTop,\n        offsetAttributes = {\n          borderLeftWidth: 'left',\n          borderTopWidth:  'top',\n          paddingLeft:     'left',\n          paddingTop:      'top'\n        };\n\n    if (!doc) {\n      return offset;\n    }\n\n    for (var attr in offsetAttributes) {\n      offset[offsetAttributes[attr]] += parseInt(getElementStyle(element, attr), 10) || 0;\n    }\n\n    docElem = doc.documentElement;\n    if ( typeof element.getBoundingClientRect !== 'undefined' ) {\n      box = element.getBoundingClientRect();\n    }\n\n    scrollLeftTop = getScrollLeftTop(element);\n\n    return {\n      left: box.left + scrollLeftTop.left - (docElem.clientLeft || 0) + offset.left,\n      top: box.top + scrollLeftTop.top - (docElem.clientTop || 0)  + offset.top\n    };\n  }\n\n  /**\n   * Returns style attribute value of a given element\n   * @memberOf fabric.util\n   * @param {HTMLElement} element Element to get style attribute for\n   * @param {String} attr Style attribute to get for element\n   * @return {String} Style attribute value of the given element.\n   */\n  var getElementStyle;\n  if (fabric.document.defaultView && fabric.document.defaultView.getComputedStyle) {\n    getElementStyle = function(element, attr) {\n      var style = fabric.document.defaultView.getComputedStyle(element, null);\n      return style ? style[attr] : undefined;\n    };\n  }\n  else {\n    getElementStyle = function(element, attr) {\n      var value = element.style[attr];\n      if (!value && element.currentStyle) {\n        value = element.currentStyle[attr];\n      }\n      return value;\n    };\n  }\n\n  (function () {\n    var style = fabric.document.documentElement.style,\n        selectProp = 'userSelect' in style\n          ? 'userSelect'\n          : 'MozUserSelect' in style\n            ? 'MozUserSelect'\n            : 'WebkitUserSelect' in style\n              ? 'WebkitUserSelect'\n              : 'KhtmlUserSelect' in style\n                ? 'KhtmlUserSelect'\n                : '';\n\n    /**\n     * Makes element unselectable\n     * @memberOf fabric.util\n     * @param {HTMLElement} element Element to make unselectable\n     * @return {HTMLElement} Element that was passed in\n     */\n    function makeElementUnselectable(element) {\n      if (typeof element.onselectstart !== 'undefined') {\n        element.onselectstart = fabric.util.falseFunction;\n      }\n      if (selectProp) {\n        element.style[selectProp] = 'none';\n      }\n      else if (typeof element.unselectable === 'string') {\n        element.unselectable = 'on';\n      }\n      return element;\n    }\n\n    /**\n     * Makes element selectable\n     * @memberOf fabric.util\n     * @param {HTMLElement} element Element to make selectable\n     * @return {HTMLElement} Element that was passed in\n     */\n    function makeElementSelectable(element) {\n      if (typeof element.onselectstart !== 'undefined') {\n        element.onselectstart = null;\n      }\n      if (selectProp) {\n        element.style[selectProp] = '';\n      }\n      else if (typeof element.unselectable === 'string') {\n        element.unselectable = '';\n      }\n      return element;\n    }\n\n    fabric.util.makeElementUnselectable = makeElementUnselectable;\n    fabric.util.makeElementSelectable = makeElementSelectable;\n  })();\n\n  (function() {\n\n    /**\n     * Inserts a script element with a given url into a document; invokes callback, when that script is finished loading\n     * @memberOf fabric.util\n     * @param {String} url URL of a script to load\n     * @param {Function} callback Callback to execute when script is finished loading\n     */\n    function getScript(url, callback) {\n      var headEl = fabric.document.getElementsByTagName('head')[0],\n          scriptEl = fabric.document.createElement('script'),\n          loading = true;\n\n      /** @ignore */\n      scriptEl.onload = /** @ignore */ scriptEl.onreadystatechange = function(e) {\n        if (loading) {\n          if (typeof this.readyState === 'string' &&\n              this.readyState !== 'loaded' &&\n              this.readyState !== 'complete') {\n            return;\n          }\n          loading = false;\n          callback(e || fabric.window.event);\n          scriptEl = scriptEl.onload = scriptEl.onreadystatechange = null;\n        }\n      };\n      scriptEl.src = url;\n      headEl.appendChild(scriptEl);\n      // causes issue in Opera\n      // headEl.removeChild(scriptEl);\n    }\n\n    fabric.util.getScript = getScript;\n  })();\n\n  function getNodeCanvas(element) {\n    var impl = fabric.jsdomImplForWrapper(element);\n    return impl._canvas || impl._image;\n  };\n\n  function cleanUpJsdomNode(element) {\n    if (!fabric.isLikelyNode) {\n      return;\n    }\n    var impl = fabric.jsdomImplForWrapper(element);\n    if (impl) {\n      impl._image = null;\n      impl._canvas = null;\n      // unsure if necessary\n      impl._currentSrc = null;\n      impl._attributes = null;\n      impl._classList = null;\n    }\n  }\n\n  fabric.util.getById = getById;\n  fabric.util.toArray = toArray;\n  fabric.util.makeElement = makeElement;\n  fabric.util.addClass = addClass;\n  fabric.util.wrapElement = wrapElement;\n  fabric.util.getScrollLeftTop = getScrollLeftTop;\n  fabric.util.getElementOffset = getElementOffset;\n  fabric.util.getElementStyle = getElementStyle;\n  fabric.util.getNodeCanvas = getNodeCanvas;\n  fabric.util.cleanUpJsdomNode = cleanUpJsdomNode;\n\n})();\n\n\n(function() {\n\n  function addParamToUrl(url, param) {\n    return url + (/\\?/.test(url) ? '&' : '?') + param;\n  }\n\n  function emptyFn() { }\n\n  /**\n   * Cross-browser abstraction for sending XMLHttpRequest\n   * @memberOf fabric.util\n   * @param {String} url URL to send XMLHttpRequest to\n   * @param {Object} [options] Options object\n   * @param {String} [options.method=\"GET\"]\n   * @param {String} [options.parameters] parameters to append to url in GET or in body\n   * @param {String} [options.body] body to send with POST or PUT request\n   * @param {Function} options.onComplete Callback to invoke when request is completed\n   * @return {XMLHttpRequest} request\n   */\n  function request(url, options) {\n    options || (options = { });\n\n    var method = options.method ? options.method.toUpperCase() : 'GET',\n        onComplete = options.onComplete || function() { },\n        xhr = new fabric.window.XMLHttpRequest(),\n        body = options.body || options.parameters;\n\n    /** @ignore */\n    xhr.onreadystatechange = function() {\n      if (xhr.readyState === 4) {\n        onComplete(xhr);\n        xhr.onreadystatechange = emptyFn;\n      }\n    };\n\n    if (method === 'GET') {\n      body = null;\n      if (typeof options.parameters === 'string') {\n        url = addParamToUrl(url, options.parameters);\n      }\n    }\n\n    xhr.open(method, url, true);\n\n    if (method === 'POST' || method === 'PUT') {\n      xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');\n    }\n\n    xhr.send(body);\n    return xhr;\n  }\n\n  fabric.util.request = request;\n})();\n\n\n/**\n * Wrapper around `console.log` (when available)\n * @param {*} [values] Values to log\n */\nfabric.log = function() { };\n\n/**\n * Wrapper around `console.warn` (when available)\n * @param {*} [values] Values to log as a warning\n */\nfabric.warn = function() { };\n\n/* eslint-disable */\nif (typeof console !== 'undefined') {\n\n  ['log', 'warn'].forEach(function(methodName) {\n\n    if (typeof console[methodName] !== 'undefined' &&\n        typeof console[methodName].apply === 'function') {\n\n      fabric[methodName] = function() {\n        return console[methodName].apply(console, arguments);\n      };\n    }\n  });\n}\n/* eslint-enable */\n\n\n(function() {\n\n  function noop() {\n    return false;\n  }\n\n  /**\n   * Changes value from one to another within certain period of time, invoking callbacks as value is being changed.\n   * @memberOf fabric.util\n   * @param {Object} [options] Animation options\n   * @param {Function} [options.onChange] Callback; invoked on every value change\n   * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n   * @param {Number} [options.startValue=0] Starting value\n   * @param {Number} [options.endValue=100] Ending value\n   * @param {Number} [options.byValue=100] Value to modify the property by\n   * @param {Function} [options.easing] Easing function\n   * @param {Number} [options.duration=500] Duration of change (in ms)\n   * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n   */\n  function animate(options) {\n\n    requestAnimFrame(function(timestamp) {\n      options || (options = { });\n\n      var start = timestamp || +new Date(),\n          duration = options.duration || 500,\n          finish = start + duration, time,\n          onChange = options.onChange || noop,\n          abort = options.abort || noop,\n          onComplete = options.onComplete || noop,\n          easing = options.easing || function(t, b, c, d) {return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;},\n          startValue = 'startValue' in options ? options.startValue : 0,\n          endValue = 'endValue' in options ? options.endValue : 100,\n          byValue = options.byValue || endValue - startValue;\n\n      options.onStart && options.onStart();\n\n      (function tick(ticktime) {\n        // TODO: move abort call after calculation\n        // and pass (current,valuePerc, timePerc) as arguments\n        if (abort()) {\n          onComplete(endValue, 1, 1);\n          return;\n        }\n        time = ticktime || +new Date();\n        var currentTime = time > finish ? duration : (time - start),\n            timePerc = currentTime / duration,\n            current = easing(currentTime, startValue, byValue, duration),\n            valuePerc = Math.abs((current - startValue) / byValue);\n        onChange(current, valuePerc, timePerc);\n        if (time > finish) {\n          options.onComplete && options.onComplete();\n          return;\n        }\n        requestAnimFrame(tick);\n      })(start);\n    });\n\n  }\n\n  var _requestAnimFrame = fabric.window.requestAnimationFrame       ||\n                          fabric.window.webkitRequestAnimationFrame ||\n                          fabric.window.mozRequestAnimationFrame    ||\n                          fabric.window.oRequestAnimationFrame      ||\n                          fabric.window.msRequestAnimationFrame     ||\n                          function(callback) {\n                            return fabric.window.setTimeout(callback, 1000 / 60);\n                          };\n\n  var _cancelAnimFrame = fabric.window.cancelAnimationFrame || fabric.window.clearTimeout;\n\n  /**\n   * requestAnimationFrame polyfill based on http://paulirish.com/2011/requestanimationframe-for-smart-animating/\n   * In order to get a precise start time, `requestAnimFrame` should be called as an entry into the method\n   * @memberOf fabric.util\n   * @param {Function} callback Callback to invoke\n   * @param {DOMElement} element optional Element to associate with animation\n   */\n  function requestAnimFrame() {\n    return _requestAnimFrame.apply(fabric.window, arguments);\n  }\n\n  function cancelAnimFrame() {\n    return _cancelAnimFrame.apply(fabric.window, arguments);\n  }\n\n  fabric.util.animate = animate;\n  fabric.util.requestAnimFrame = requestAnimFrame;\n  fabric.util.cancelAnimFrame = cancelAnimFrame;\n})();\n\n\n(function() {\n  // Calculate an in-between color. Returns a \"rgba()\" string.\n  // Credit: Edwin Martin <edwin@bitstorm.org>\n  //         http://www.bitstorm.org/jquery/color-animation/jquery.animate-colors.js\n  function calculateColor(begin, end, pos) {\n    var color = 'rgba('\n        + parseInt((begin[0] + pos * (end[0] - begin[0])), 10) + ','\n        + parseInt((begin[1] + pos * (end[1] - begin[1])), 10) + ','\n        + parseInt((begin[2] + pos * (end[2] - begin[2])), 10);\n\n    color += ',' + (begin && end ? parseFloat(begin[3] + pos * (end[3] - begin[3])) : 1);\n    color += ')';\n    return color;\n  }\n\n  /**\n   * Changes the color from one to another within certain period of time, invoking callbacks as value is being changed.\n   * @memberOf fabric.util\n   * @param {String} fromColor The starting color in hex or rgb(a) format.\n   * @param {String} toColor The starting color in hex or rgb(a) format.\n   * @param {Number} [duration] Duration of change (in ms).\n   * @param {Object} [options] Animation options\n   * @param {Function} [options.onChange] Callback; invoked on every value change\n   * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n   * @param {Function} [options.colorEasing] Easing function. Note that this function only take two arguments (currentTime, duration). Thus the regular animation easing functions cannot be used.\n   * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n   */\n  function animateColor(fromColor, toColor, duration, options) {\n    var startColor = new fabric.Color(fromColor).getSource(),\n        endColor = new fabric.Color(toColor).getSource();\n\n    options = options || {};\n\n    fabric.util.animate(fabric.util.object.extend(options, {\n      duration: duration || 500,\n      startValue: startColor,\n      endValue: endColor,\n      byValue: endColor,\n      easing: function (currentTime, startValue, byValue, duration) {\n        var posValue = options.colorEasing\n          ? options.colorEasing(currentTime, duration)\n          : 1 - Math.cos(currentTime / duration * (Math.PI / 2));\n        return calculateColor(startValue, byValue, posValue);\n      }\n    }));\n  }\n\n  fabric.util.animateColor = animateColor;\n\n})();\n\n\n(function() {\n\n  function normalize(a, c, p, s) {\n    if (a < Math.abs(c)) {\n      a = c;\n      s = p / 4;\n    }\n    else {\n      //handle the 0/0 case:\n      if (c === 0 && a === 0) {\n        s = p / (2 * Math.PI) * Math.asin(1);\n      }\n      else {\n        s = p / (2 * Math.PI) * Math.asin(c / a);\n      }\n    }\n    return { a: a, c: c, p: p, s: s };\n  }\n\n  function elastic(opts, t, d) {\n    return opts.a *\n      Math.pow(2, 10 * (t -= 1)) *\n      Math.sin( (t * d - opts.s) * (2 * Math.PI) / opts.p );\n  }\n\n  /**\n   * Cubic easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutCubic(t, b, c, d) {\n    return c * ((t = t / d - 1) * t * t + 1) + b;\n  }\n\n  /**\n   * Cubic easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutCubic(t, b, c, d) {\n    t /= d / 2;\n    if (t < 1) {\n      return c / 2 * t * t * t + b;\n    }\n    return c / 2 * ((t -= 2) * t * t + 2) + b;\n  }\n\n  /**\n   * Quartic easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInQuart(t, b, c, d) {\n    return c * (t /= d) * t * t * t + b;\n  }\n\n  /**\n   * Quartic easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutQuart(t, b, c, d) {\n    return -c * ((t = t / d - 1) * t * t * t - 1) + b;\n  }\n\n  /**\n   * Quartic easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutQuart(t, b, c, d) {\n    t /= d / 2;\n    if (t < 1) {\n      return c / 2 * t * t * t * t + b;\n    }\n    return -c / 2 * ((t -= 2) * t * t * t - 2) + b;\n  }\n\n  /**\n   * Quintic easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInQuint(t, b, c, d) {\n    return c * (t /= d) * t * t * t * t + b;\n  }\n\n  /**\n   * Quintic easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutQuint(t, b, c, d) {\n    return c * ((t = t / d - 1) * t * t * t * t + 1) + b;\n  }\n\n  /**\n   * Quintic easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutQuint(t, b, c, d) {\n    t /= d / 2;\n    if (t < 1) {\n      return c / 2 * t * t * t * t * t + b;\n    }\n    return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;\n  }\n\n  /**\n   * Sinusoidal easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInSine(t, b, c, d) {\n    return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;\n  }\n\n  /**\n   * Sinusoidal easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutSine(t, b, c, d) {\n    return c * Math.sin(t / d * (Math.PI / 2)) + b;\n  }\n\n  /**\n   * Sinusoidal easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutSine(t, b, c, d) {\n    return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;\n  }\n\n  /**\n   * Exponential easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInExpo(t, b, c, d) {\n    return (t === 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;\n  }\n\n  /**\n   * Exponential easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutExpo(t, b, c, d) {\n    return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;\n  }\n\n  /**\n   * Exponential easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutExpo(t, b, c, d) {\n    if (t === 0) {\n      return b;\n    }\n    if (t === d) {\n      return b + c;\n    }\n    t /= d / 2;\n    if (t < 1) {\n      return c / 2 * Math.pow(2, 10 * (t - 1)) + b;\n    }\n    return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;\n  }\n\n  /**\n   * Circular easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInCirc(t, b, c, d) {\n    return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;\n  }\n\n  /**\n   * Circular easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutCirc(t, b, c, d) {\n    return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;\n  }\n\n  /**\n   * Circular easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutCirc(t, b, c, d) {\n    t /= d / 2;\n    if (t < 1) {\n      return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;\n    }\n    return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;\n  }\n\n  /**\n   * Elastic easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInElastic(t, b, c, d) {\n    var s = 1.70158, p = 0, a = c;\n    if (t === 0) {\n      return b;\n    }\n    t /= d;\n    if (t === 1) {\n      return b + c;\n    }\n    if (!p) {\n      p = d * 0.3;\n    }\n    var opts = normalize(a, c, p, s);\n    return -elastic(opts, t, d) + b;\n  }\n\n  /**\n   * Elastic easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutElastic(t, b, c, d) {\n    var s = 1.70158, p = 0, a = c;\n    if (t === 0) {\n      return b;\n    }\n    t /= d;\n    if (t === 1) {\n      return b + c;\n    }\n    if (!p) {\n      p = d * 0.3;\n    }\n    var opts = normalize(a, c, p, s);\n    return opts.a * Math.pow(2, -10 * t) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) + opts.c + b;\n  }\n\n  /**\n   * Elastic easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutElastic(t, b, c, d) {\n    var s = 1.70158, p = 0, a = c;\n    if (t === 0) {\n      return b;\n    }\n    t /= d / 2;\n    if (t === 2) {\n      return b + c;\n    }\n    if (!p) {\n      p = d * (0.3 * 1.5);\n    }\n    var opts = normalize(a, c, p, s);\n    if (t < 1) {\n      return -0.5 * elastic(opts, t, d) + b;\n    }\n    return opts.a * Math.pow(2, -10 * (t -= 1)) *\n      Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) * 0.5 + opts.c + b;\n  }\n\n  /**\n   * Backwards easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInBack(t, b, c, d, s) {\n    if (s === undefined) {\n      s = 1.70158;\n    }\n    return c * (t /= d) * t * ((s + 1) * t - s) + b;\n  }\n\n  /**\n   * Backwards easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutBack(t, b, c, d, s) {\n    if (s === undefined) {\n      s = 1.70158;\n    }\n    return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;\n  }\n\n  /**\n   * Backwards easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutBack(t, b, c, d, s) {\n    if (s === undefined) {\n      s = 1.70158;\n    }\n    t /= d / 2;\n    if (t < 1) {\n      return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;\n    }\n    return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;\n  }\n\n  /**\n   * Bouncing easing in\n   * @memberOf fabric.util.ease\n   */\n  function easeInBounce(t, b, c, d) {\n    return c - easeOutBounce (d - t, 0, c, d) + b;\n  }\n\n  /**\n   * Bouncing easing out\n   * @memberOf fabric.util.ease\n   */\n  function easeOutBounce(t, b, c, d) {\n    if ((t /= d) < (1 / 2.75)) {\n      return c * (7.5625 * t * t) + b;\n    }\n    else if (t < (2 / 2.75)) {\n      return c * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75) + b;\n    }\n    else if (t < (2.5 / 2.75)) {\n      return c * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375) + b;\n    }\n    else {\n      return c * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375) + b;\n    }\n  }\n\n  /**\n   * Bouncing easing in and out\n   * @memberOf fabric.util.ease\n   */\n  function easeInOutBounce(t, b, c, d) {\n    if (t < d / 2) {\n      return easeInBounce (t * 2, 0, c, d) * 0.5 + b;\n    }\n    return easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;\n  }\n\n  /**\n   * Easing functions\n   * See <a href=\"http://gizma.com/easing/\">Easing Equations by Robert Penner</a>\n   * @namespace fabric.util.ease\n   */\n  fabric.util.ease = {\n\n    /**\n     * Quadratic easing in\n     * @memberOf fabric.util.ease\n     */\n    easeInQuad: function(t, b, c, d) {\n      return c * (t /= d) * t + b;\n    },\n\n    /**\n     * Quadratic easing out\n     * @memberOf fabric.util.ease\n     */\n    easeOutQuad: function(t, b, c, d) {\n      return -c * (t /= d) * (t - 2) + b;\n    },\n\n    /**\n     * Quadratic easing in and out\n     * @memberOf fabric.util.ease\n     */\n    easeInOutQuad: function(t, b, c, d) {\n      t /= (d / 2);\n      if (t < 1) {\n        return c / 2 * t * t + b;\n      }\n      return -c / 2 * ((--t) * (t - 2) - 1) + b;\n    },\n\n    /**\n     * Cubic easing in\n     * @memberOf fabric.util.ease\n     */\n    easeInCubic: function(t, b, c, d) {\n      return c * (t /= d) * t * t + b;\n    },\n\n    easeOutCubic: easeOutCubic,\n    easeInOutCubic: easeInOutCubic,\n    easeInQuart: easeInQuart,\n    easeOutQuart: easeOutQuart,\n    easeInOutQuart: easeInOutQuart,\n    easeInQuint: easeInQuint,\n    easeOutQuint: easeOutQuint,\n    easeInOutQuint: easeInOutQuint,\n    easeInSine: easeInSine,\n    easeOutSine: easeOutSine,\n    easeInOutSine: easeInOutSine,\n    easeInExpo: easeInExpo,\n    easeOutExpo: easeOutExpo,\n    easeInOutExpo: easeInOutExpo,\n    easeInCirc: easeInCirc,\n    easeOutCirc: easeOutCirc,\n    easeInOutCirc: easeInOutCirc,\n    easeInElastic: easeInElastic,\n    easeOutElastic: easeOutElastic,\n    easeInOutElastic: easeInOutElastic,\n    easeInBack: easeInBack,\n    easeOutBack: easeOutBack,\n    easeInOutBack: easeInOutBack,\n    easeInBounce: easeInBounce,\n    easeOutBounce: easeOutBounce,\n    easeInOutBounce: easeInOutBounce\n  };\n\n})();\n\n\n(function(global) {\n\n  'use strict';\n\n  /**\n   * @name fabric\n   * @namespace\n   */\n\n  var fabric = global.fabric || (global.fabric = { }),\n      extend = fabric.util.object.extend,\n      clone = fabric.util.object.clone,\n      toFixed = fabric.util.toFixed,\n      parseUnit = fabric.util.parseUnit,\n      multiplyTransformMatrices = fabric.util.multiplyTransformMatrices,\n\n      svgValidTagNames = ['path', 'circle', 'polygon', 'polyline', 'ellipse', 'rect', 'line',\n        'image', 'text'],\n      svgViewBoxElements = ['symbol', 'image', 'marker', 'pattern', 'view', 'svg'],\n      svgInvalidAncestors = ['pattern', 'defs', 'symbol', 'metadata', 'clipPath', 'mask', 'desc'],\n      svgValidParents = ['symbol', 'g', 'a', 'svg', 'clipPath', 'defs'],\n\n      attributesMap = {\n        cx:                   'left',\n        x:                    'left',\n        r:                    'radius',\n        cy:                   'top',\n        y:                    'top',\n        display:              'visible',\n        visibility:           'visible',\n        transform:            'transformMatrix',\n        'fill-opacity':       'fillOpacity',\n        'fill-rule':          'fillRule',\n        'font-family':        'fontFamily',\n        'font-size':          'fontSize',\n        'font-style':         'fontStyle',\n        'font-weight':        'fontWeight',\n        'letter-spacing':     'charSpacing',\n        'paint-order':        'paintFirst',\n        'stroke-dasharray':   'strokeDashArray',\n        'stroke-dashoffset':  'strokeDashOffset',\n        'stroke-linecap':     'strokeLineCap',\n        'stroke-linejoin':    'strokeLineJoin',\n        'stroke-miterlimit':  'strokeMiterLimit',\n        'stroke-opacity':     'strokeOpacity',\n        'stroke-width':       'strokeWidth',\n        'text-decoration':    'textDecoration',\n        'text-anchor':        'textAnchor',\n        opacity:              'opacity',\n        'clip-path':          'clipPath',\n        'clip-rule':          'clipRule',\n        'vector-effect':      'strokeUniform'\n      },\n\n      colorAttributes = {\n        stroke: 'strokeOpacity',\n        fill:   'fillOpacity'\n      };\n\n  fabric.svgValidTagNamesRegEx = getSvgRegex(svgValidTagNames);\n  fabric.svgViewBoxElementsRegEx = getSvgRegex(svgViewBoxElements);\n  fabric.svgInvalidAncestorsRegEx = getSvgRegex(svgInvalidAncestors);\n  fabric.svgValidParentsRegEx = getSvgRegex(svgValidParents);\n\n  fabric.cssRules = { };\n  fabric.gradientDefs = { };\n  fabric.clipPaths = { };\n\n  function normalizeAttr(attr) {\n    // transform attribute names\n    if (attr in attributesMap) {\n      return attributesMap[attr];\n    }\n    return attr;\n  }\n\n  function normalizeValue(attr, value, parentAttributes, fontSize) {\n    var isArray = Object.prototype.toString.call(value) === '[object Array]',\n        parsed;\n\n    if ((attr === 'fill' || attr === 'stroke') && value === 'none') {\n      value = '';\n    }\n    else if (attr === 'vector-effect') {\n      value = value === 'non-scaling-stroke';\n    }\n    else if (attr === 'strokeDashArray') {\n      if (value === 'none') {\n        value = null;\n      }\n      else {\n        value = value.replace(/,/g, ' ').split(/\\s+/).map(parseFloat);\n      }\n    }\n    else if (attr === 'transformMatrix') {\n      if (parentAttributes && parentAttributes.transformMatrix) {\n        value = multiplyTransformMatrices(\n          parentAttributes.transformMatrix, fabric.parseTransformAttribute(value));\n      }\n      else {\n        value = fabric.parseTransformAttribute(value);\n      }\n    }\n    else if (attr === 'visible') {\n      value = value !== 'none' && value !== 'hidden';\n      // display=none on parent element always takes precedence over child element\n      if (parentAttributes && parentAttributes.visible === false) {\n        value = false;\n      }\n    }\n    else if (attr === 'opacity') {\n      value = parseFloat(value);\n      if (parentAttributes && typeof parentAttributes.opacity !== 'undefined') {\n        value *= parentAttributes.opacity;\n      }\n    }\n    else if (attr === 'textAnchor' /* text-anchor */) {\n      value = value === 'start' ? 'left' : value === 'end' ? 'right' : 'center';\n    }\n    else if (attr === 'charSpacing') {\n      // parseUnit returns px and we convert it to em\n      parsed = parseUnit(value, fontSize) / fontSize * 1000;\n    }\n    else if (attr === 'paintFirst') {\n      var fillIndex = value.indexOf('fill');\n      var strokeIndex = value.indexOf('stroke');\n      var value = 'fill';\n      if (fillIndex > -1 && strokeIndex > -1 && strokeIndex < fillIndex) {\n        value = 'stroke';\n      }\n      else if (fillIndex === -1 && strokeIndex > -1) {\n        value = 'stroke';\n      }\n    }\n    else if (attr === 'href' || attr === 'xlink:href') {\n      return value;\n    }\n    else {\n      parsed = isArray ? value.map(parseUnit) : parseUnit(value, fontSize);\n    }\n\n    return (!isArray && isNaN(parsed) ? value : parsed);\n  }\n\n  /**\n    * @private\n    */\n  function getSvgRegex(arr) {\n    return new RegExp('^(' + arr.join('|') + ')\\\\b', 'i');\n  }\n\n  /**\n   * @private\n   * @param {Object} attributes Array of attributes to parse\n   */\n  function _setStrokeFillOpacity(attributes) {\n    for (var attr in colorAttributes) {\n\n      if (typeof attributes[colorAttributes[attr]] === 'undefined' || attributes[attr] === '') {\n        continue;\n      }\n\n      if (typeof attributes[attr] === 'undefined') {\n        if (!fabric.Object.prototype[attr]) {\n          continue;\n        }\n        attributes[attr] = fabric.Object.prototype[attr];\n      }\n\n      if (attributes[attr].indexOf('url(') === 0) {\n        continue;\n      }\n\n      var color = new fabric.Color(attributes[attr]);\n      attributes[attr] = color.setAlpha(toFixed(color.getAlpha() * attributes[colorAttributes[attr]], 2)).toRgba();\n    }\n    return attributes;\n  }\n\n  /**\n   * @private\n   */\n  function _getMultipleNodes(doc, nodeNames) {\n    var nodeName, nodeArray = [], nodeList, i, len;\n    for (i = 0, len = nodeNames.length; i < len; i++) {\n      nodeName = nodeNames[i];\n      nodeList = doc.getElementsByTagName(nodeName);\n      nodeArray = nodeArray.concat(Array.prototype.slice.call(nodeList));\n    }\n    return nodeArray;\n  }\n\n  /**\n   * Parses \"transform\" attribute, returning an array of values\n   * @static\n   * @function\n   * @memberOf fabric\n   * @param {String} attributeValue String containing attribute value\n   * @return {Array} Array of 6 elements representing transformation matrix\n   */\n  fabric.parseTransformAttribute = (function() {\n    function rotateMatrix(matrix, args) {\n      var cos = fabric.util.cos(args[0]), sin = fabric.util.sin(args[0]),\n          x = 0, y = 0;\n      if (args.length === 3) {\n        x = args[1];\n        y = args[2];\n      }\n\n      matrix[0] = cos;\n      matrix[1] = sin;\n      matrix[2] = -sin;\n      matrix[3] = cos;\n      matrix[4] = x - (cos * x - sin * y);\n      matrix[5] = y - (sin * x + cos * y);\n    }\n\n    function scaleMatrix(matrix, args) {\n      var multiplierX = args[0],\n          multiplierY = (args.length === 2) ? args[1] : args[0];\n\n      matrix[0] = multiplierX;\n      matrix[3] = multiplierY;\n    }\n\n    function skewMatrix(matrix, args, pos) {\n      matrix[pos] = Math.tan(fabric.util.degreesToRadians(args[0]));\n    }\n\n    function translateMatrix(matrix, args) {\n      matrix[4] = args[0];\n      if (args.length === 2) {\n        matrix[5] = args[1];\n      }\n    }\n\n    // identity matrix\n    var iMatrix = fabric.iMatrix,\n\n        // == begin transform regexp\n        number = fabric.reNum,\n\n        commaWsp = '(?:\\\\s+,?\\\\s*|,\\\\s*)',\n\n        skewX = '(?:(skewX)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n\n        skewY = '(?:(skewY)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n\n        rotate = '(?:(rotate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n                    commaWsp + '(' + number + ')' +\n                    commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n        scale = '(?:(scale)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n                    commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n        translate = '(?:(translate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n                    commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n        matrix = '(?:(matrix)\\\\s*\\\\(\\\\s*' +\n                  '(' + number + ')' + commaWsp +\n                  '(' + number + ')' + commaWsp +\n                  '(' + number + ')' + commaWsp +\n                  '(' + number + ')' + commaWsp +\n                  '(' + number + ')' + commaWsp +\n                  '(' + number + ')' +\n                  '\\\\s*\\\\))',\n\n        transform = '(?:' +\n                    matrix + '|' +\n                    translate + '|' +\n                    scale + '|' +\n                    rotate + '|' +\n                    skewX + '|' +\n                    skewY +\n                    ')',\n\n        transforms = '(?:' + transform + '(?:' + commaWsp + '*' + transform + ')*' + ')',\n\n        transformList = '^\\\\s*(?:' + transforms + '?)\\\\s*$',\n\n        // http://www.w3.org/TR/SVG/coords.html#TransformAttribute\n        reTransformList = new RegExp(transformList),\n        // == end transform regexp\n\n        reTransform = new RegExp(transform, 'g');\n\n    return function(attributeValue) {\n\n      // start with identity matrix\n      var matrix = iMatrix.concat(),\n          matrices = [];\n\n      // return if no argument was given or\n      // an argument does not match transform attribute regexp\n      if (!attributeValue || (attributeValue && !reTransformList.test(attributeValue))) {\n        return matrix;\n      }\n\n      attributeValue.replace(reTransform, function(match) {\n\n        var m = new RegExp(transform).exec(match).filter(function (match) {\n              // match !== '' && match != null\n              return (!!match);\n            }),\n            operation = m[1],\n            args = m.slice(2).map(parseFloat);\n\n        switch (operation) {\n          case 'translate':\n            translateMatrix(matrix, args);\n            break;\n          case 'rotate':\n            args[0] = fabric.util.degreesToRadians(args[0]);\n            rotateMatrix(matrix, args);\n            break;\n          case 'scale':\n            scaleMatrix(matrix, args);\n            break;\n          case 'skewX':\n            skewMatrix(matrix, args, 2);\n            break;\n          case 'skewY':\n            skewMatrix(matrix, args, 1);\n            break;\n          case 'matrix':\n            matrix = args;\n            break;\n        }\n\n        // snapshot current matrix into matrices array\n        matrices.push(matrix.concat());\n        // reset\n        matrix = iMatrix.concat();\n      });\n\n      var combinedMatrix = matrices[0];\n      while (matrices.length > 1) {\n        matrices.shift();\n        combinedMatrix = fabric.util.multiplyTransformMatrices(combinedMatrix, matrices[0]);\n      }\n      return combinedMatrix;\n    };\n  })();\n\n  /**\n   * @private\n   */\n  function parseStyleString(style, oStyle) {\n    var attr, value;\n    style.replace(/;\\s*$/, '').split(';').forEach(function (chunk) {\n      var pair = chunk.split(':');\n\n      attr = pair[0].trim().toLowerCase();\n      value =  pair[1].trim();\n\n      oStyle[attr] = value;\n    });\n  }\n\n  /**\n   * @private\n   */\n  function parseStyleObject(style, oStyle) {\n    var attr, value;\n    for (var prop in style) {\n      if (typeof style[prop] === 'undefined') {\n        continue;\n      }\n\n      attr = prop.toLowerCase();\n      value = style[prop];\n\n      oStyle[attr] = value;\n    }\n  }\n\n  /**\n   * @private\n   */\n  function getGlobalStylesForElement(element, svgUid) {\n    var styles = { };\n    for (var rule in fabric.cssRules[svgUid]) {\n      if (elementMatchesRule(element, rule.split(' '))) {\n        for (var property in fabric.cssRules[svgUid][rule]) {\n          styles[property] = fabric.cssRules[svgUid][rule][property];\n        }\n      }\n    }\n    return styles;\n  }\n\n  /**\n   * @private\n   */\n  function elementMatchesRule(element, selectors) {\n    var firstMatching, parentMatching = true;\n    //start from rightmost selector.\n    firstMatching = selectorMatches(element, selectors.pop());\n    if (firstMatching && selectors.length) {\n      parentMatching = doesSomeParentMatch(element, selectors);\n    }\n    return firstMatching && parentMatching && (selectors.length === 0);\n  }\n\n  function doesSomeParentMatch(element, selectors) {\n    var selector, parentMatching = true;\n    while (element.parentNode && element.parentNode.nodeType === 1 && selectors.length) {\n      if (parentMatching) {\n        selector = selectors.pop();\n      }\n      element = element.parentNode;\n      parentMatching = selectorMatches(element, selector);\n    }\n    return selectors.length === 0;\n  }\n\n  /**\n   * @private\n   */\n  function selectorMatches(element, selector) {\n    var nodeName = element.nodeName,\n        classNames = element.getAttribute('class'),\n        id = element.getAttribute('id'), matcher, i;\n    // i check if a selector matches slicing away part from it.\n    // if i get empty string i should match\n    matcher = new RegExp('^' + nodeName, 'i');\n    selector = selector.replace(matcher, '');\n    if (id && selector.length) {\n      matcher = new RegExp('#' + id + '(?![a-zA-Z\\\\-]+)', 'i');\n      selector = selector.replace(matcher, '');\n    }\n    if (classNames && selector.length) {\n      classNames = classNames.split(' ');\n      for (i = classNames.length; i--;) {\n        matcher = new RegExp('\\\\.' + classNames[i] + '(?![a-zA-Z\\\\-]+)', 'i');\n        selector = selector.replace(matcher, '');\n      }\n    }\n    return selector.length === 0;\n  }\n\n  /**\n   * @private\n   * to support IE8 missing getElementById on SVGdocument and on node xmlDOM\n   */\n  function elementById(doc, id) {\n    var el;\n    doc.getElementById && (el = doc.getElementById(id));\n    if (el) {\n      return el;\n    }\n    var node, i, len, nodelist = doc.getElementsByTagName('*');\n    for (i = 0, len = nodelist.length; i < len; i++) {\n      node = nodelist[i];\n      if (id === node.getAttribute('id')) {\n        return node;\n      }\n    }\n  }\n\n  /**\n   * @private\n   */\n  function parseUseDirectives(doc) {\n    var nodelist = _getMultipleNodes(doc, ['use', 'svg:use']), i = 0;\n    while (nodelist.length && i < nodelist.length) {\n      var el = nodelist[i],\n          xlink = (el.getAttribute('xlink:href') || el.getAttribute('href')).substr(1),\n          x = el.getAttribute('x') || 0,\n          y = el.getAttribute('y') || 0,\n          el2 = elementById(doc, xlink).cloneNode(true),\n          currentTrans = (el2.getAttribute('transform') || '') + ' translate(' + x + ', ' + y + ')',\n          parentNode, oldLength = nodelist.length, attr, j, attrs, len;\n\n      applyViewboxTransform(el2);\n      if (/^svg$/i.test(el2.nodeName)) {\n        var el3 = el2.ownerDocument.createElement('g');\n        for (j = 0, attrs = el2.attributes, len = attrs.length; j < len; j++) {\n          attr = attrs.item(j);\n          el3.setAttribute(attr.nodeName, attr.nodeValue);\n        }\n        // el2.firstChild != null\n        while (el2.firstChild) {\n          el3.appendChild(el2.firstChild);\n        }\n        el2 = el3;\n      }\n\n      for (j = 0, attrs = el.attributes, len = attrs.length; j < len; j++) {\n        attr = attrs.item(j);\n        if (attr.nodeName === 'x' || attr.nodeName === 'y' ||\n          attr.nodeName === 'xlink:href' || attr.nodeName === 'href') {\n          continue;\n        }\n\n        if (attr.nodeName === 'transform') {\n          currentTrans = attr.nodeValue + ' ' + currentTrans;\n        }\n        else {\n          el2.setAttribute(attr.nodeName, attr.nodeValue);\n        }\n      }\n\n      el2.setAttribute('transform', currentTrans);\n      el2.setAttribute('instantiated_by_use', '1');\n      el2.removeAttribute('id');\n      parentNode = el.parentNode;\n      parentNode.replaceChild(el2, el);\n      // some browsers do not shorten nodelist after replaceChild (IE8)\n      if (nodelist.length === oldLength) {\n        i++;\n      }\n    }\n  }\n\n  // http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute\n  // matches, e.g.: +14.56e-12, etc.\n  var reViewBoxAttrValue = new RegExp(\n    '^' +\n    '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n    '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n    '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n    '\\\\s*(' + fabric.reNum + '+)\\\\s*' +\n    '$'\n  );\n\n  /**\n   * Add a <g> element that envelop all child elements and makes the viewbox transformMatrix descend on all elements\n   */\n  function applyViewboxTransform(element) {\n\n    var viewBoxAttr = element.getAttribute('viewBox'),\n        scaleX = 1,\n        scaleY = 1,\n        minX = 0,\n        minY = 0,\n        viewBoxWidth, viewBoxHeight, matrix, el,\n        widthAttr = element.getAttribute('width'),\n        heightAttr = element.getAttribute('height'),\n        x = element.getAttribute('x') || 0,\n        y = element.getAttribute('y') || 0,\n        preserveAspectRatio = element.getAttribute('preserveAspectRatio') || '',\n        missingViewBox = (!viewBoxAttr || !fabric.svgViewBoxElementsRegEx.test(element.nodeName)\n                           || !(viewBoxAttr = viewBoxAttr.match(reViewBoxAttrValue))),\n        missingDimAttr = (!widthAttr || !heightAttr || widthAttr === '100%' || heightAttr === '100%'),\n        toBeParsed = missingViewBox && missingDimAttr,\n        parsedDim = { }, translateMatrix = '', widthDiff = 0, heightDiff = 0;\n\n    parsedDim.width = 0;\n    parsedDim.height = 0;\n    parsedDim.toBeParsed = toBeParsed;\n\n    if (toBeParsed) {\n      return parsedDim;\n    }\n\n    if (missingViewBox) {\n      parsedDim.width = parseUnit(widthAttr);\n      parsedDim.height = parseUnit(heightAttr);\n      return parsedDim;\n    }\n\n    minX = -parseFloat(viewBoxAttr[1]);\n    minY = -parseFloat(viewBoxAttr[2]);\n    viewBoxWidth = parseFloat(viewBoxAttr[3]);\n    viewBoxHeight = parseFloat(viewBoxAttr[4]);\n\n    if (!missingDimAttr) {\n      parsedDim.width = parseUnit(widthAttr);\n      parsedDim.height = parseUnit(heightAttr);\n      scaleX = parsedDim.width / viewBoxWidth;\n      scaleY = parsedDim.height / viewBoxHeight;\n    }\n    else {\n      parsedDim.width = viewBoxWidth;\n      parsedDim.height = viewBoxHeight;\n    }\n\n    // default is to preserve aspect ratio\n    preserveAspectRatio = fabric.util.parsePreserveAspectRatioAttribute(preserveAspectRatio);\n    if (preserveAspectRatio.alignX !== 'none') {\n      //translate all container for the effect of Mid, Min, Max\n      if (preserveAspectRatio.meetOrSlice === 'meet') {\n        scaleY = scaleX = (scaleX > scaleY ? scaleY : scaleX);\n        // calculate additional translation to move the viewbox\n      }\n      if (preserveAspectRatio.meetOrSlice === 'slice') {\n        scaleY = scaleX = (scaleX > scaleY ? scaleX : scaleY);\n        // calculate additional translation to move the viewbox\n      }\n      widthDiff = parsedDim.width - viewBoxWidth * scaleX;\n      heightDiff = parsedDim.height - viewBoxHeight * scaleX;\n      if (preserveAspectRatio.alignX === 'Mid') {\n        widthDiff /= 2;\n      }\n      if (preserveAspectRatio.alignY === 'Mid') {\n        heightDiff /= 2;\n      }\n      if (preserveAspectRatio.alignX === 'Min') {\n        widthDiff = 0;\n      }\n      if (preserveAspectRatio.alignY === 'Min') {\n        heightDiff = 0;\n      }\n    }\n\n    if (scaleX === 1 && scaleY === 1 && minX === 0 && minY === 0 && x === 0 && y === 0) {\n      return parsedDim;\n    }\n\n    if (x || y) {\n      translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';\n    }\n\n    matrix = translateMatrix + ' matrix(' + scaleX +\n                  ' 0' +\n                  ' 0 ' +\n                  scaleY + ' ' +\n                  (minX * scaleX + widthDiff) + ' ' +\n                  (minY * scaleY + heightDiff) + ') ';\n    parsedDim.viewboxTransform = fabric.parseTransformAttribute(matrix);\n    if (element.nodeName === 'svg') {\n      el = element.ownerDocument.createElement('g');\n      // element.firstChild != null\n      while (element.firstChild) {\n        el.appendChild(element.firstChild);\n      }\n      element.appendChild(el);\n    }\n    else {\n      el = element;\n      matrix = el.getAttribute('transform') + matrix;\n    }\n    el.setAttribute('transform', matrix);\n    return parsedDim;\n  }\n\n  function hasAncestorWithNodeName(element, nodeName) {\n    while (element && (element = element.parentNode)) {\n      if (element.nodeName && nodeName.test(element.nodeName.replace('svg:', ''))\n        && !element.getAttribute('instantiated_by_use')) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Parses an SVG document, converts it to an array of corresponding fabric.* instances and passes them to a callback\n   * @static\n   * @function\n   * @memberOf fabric\n   * @param {SVGDocument} doc SVG document to parse\n   * @param {Function} callback Callback to call when parsing is finished;\n   * It's being passed an array of elements (parsed from a document).\n   * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n   * @param {Object} [parsingOptions] options for parsing document\n   * @param {String} [parsingOptions.crossOrigin] crossOrigin settings\n   */\n  fabric.parseSVGDocument = function(doc, callback, reviver, parsingOptions) {\n    if (!doc) {\n      return;\n    }\n\n    parseUseDirectives(doc);\n\n    var svgUid =  fabric.Object.__uid++, i, len,\n        options = applyViewboxTransform(doc),\n        descendants = fabric.util.toArray(doc.getElementsByTagName('*'));\n    options.crossOrigin = parsingOptions && parsingOptions.crossOrigin;\n    options.svgUid = svgUid;\n\n    if (descendants.length === 0 && fabric.isLikelyNode) {\n      // we're likely in node, where \"o3-xml\" library fails to gEBTN(\"*\")\n      // https://github.com/ajaxorg/node-o3-xml/issues/21\n      descendants = doc.selectNodes('//*[name(.)!=\"svg\"]');\n      var arr = [];\n      for (i = 0, len = descendants.length; i < len; i++) {\n        arr[i] = descendants[i];\n      }\n      descendants = arr;\n    }\n\n    var elements = descendants.filter(function(el) {\n      applyViewboxTransform(el);\n      return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', '')) &&\n            !hasAncestorWithNodeName(el, fabric.svgInvalidAncestorsRegEx); // http://www.w3.org/TR/SVG/struct.html#DefsElement\n    });\n\n    if (!elements || (elements && !elements.length)) {\n      callback && callback([], {});\n      return;\n    }\n    var clipPaths = { };\n    descendants.filter(function(el) {\n      return el.nodeName.replace('svg:', '') === 'clipPath';\n    }).forEach(function(el) {\n      var id = el.getAttribute('id');\n      clipPaths[id] = fabric.util.toArray(el.getElementsByTagName('*')).filter(function(el) {\n        return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', ''));\n      });\n    });\n    fabric.gradientDefs[svgUid] = fabric.getGradientDefs(doc);\n    fabric.cssRules[svgUid] = fabric.getCSSRules(doc);\n    fabric.clipPaths[svgUid] = clipPaths;\n    // Precedence of rules:   style > class > attribute\n    fabric.parseElements(elements, function(instances, elements) {\n      if (callback) {\n        callback(instances, options, elements, descendants);\n        delete fabric.gradientDefs[svgUid];\n        delete fabric.cssRules[svgUid];\n        delete fabric.clipPaths[svgUid];\n      }\n    }, clone(options), reviver, parsingOptions);\n  };\n\n  function recursivelyParseGradientsXlink(doc, gradient) {\n    var gradientsAttrs = ['gradientTransform', 'x1', 'x2', 'y1', 'y2', 'gradientUnits', 'cx', 'cy', 'r', 'fx', 'fy'],\n        xlinkAttr = 'xlink:href',\n        xLink = gradient.getAttribute(xlinkAttr).substr(1),\n        referencedGradient = elementById(doc, xLink);\n    if (referencedGradient && referencedGradient.getAttribute(xlinkAttr)) {\n      recursivelyParseGradientsXlink(doc, referencedGradient);\n    }\n    gradientsAttrs.forEach(function(attr) {\n      if (!gradient.hasAttribute(attr)) {\n        gradient.setAttribute(attr, referencedGradient.getAttribute(attr));\n      }\n    });\n    if (!gradient.children.length) {\n      var referenceClone = referencedGradient.cloneNode(true);\n      while (referenceClone.firstChild) {\n        gradient.appendChild(referenceClone.firstChild);\n      }\n    }\n    gradient.removeAttribute(xlinkAttr);\n  }\n\n  var reFontDeclaration = new RegExp(\n    '(normal|italic)?\\\\s*(normal|small-caps)?\\\\s*' +\n    '(normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900)?\\\\s*(' +\n      fabric.reNum +\n    '(?:px|cm|mm|em|pt|pc|in)*)(?:\\\\/(normal|' + fabric.reNum + '))?\\\\s+(.*)');\n\n  extend(fabric, {\n    /**\n     * Parses a short font declaration, building adding its properties to a style object\n     * @static\n     * @function\n     * @memberOf fabric\n     * @param {String} value font declaration\n     * @param {Object} oStyle definition\n     */\n    parseFontDeclaration: function(value, oStyle) {\n      var match = value.match(reFontDeclaration);\n\n      if (!match) {\n        return;\n      }\n      var fontStyle = match[1],\n          // font variant is not used\n          // fontVariant = match[2],\n          fontWeight = match[3],\n          fontSize = match[4],\n          lineHeight = match[5],\n          fontFamily = match[6];\n\n      if (fontStyle) {\n        oStyle.fontStyle = fontStyle;\n      }\n      if (fontWeight) {\n        oStyle.fontWeight = isNaN(parseFloat(fontWeight)) ? fontWeight : parseFloat(fontWeight);\n      }\n      if (fontSize) {\n        oStyle.fontSize = parseUnit(fontSize);\n      }\n      if (fontFamily) {\n        oStyle.fontFamily = fontFamily;\n      }\n      if (lineHeight) {\n        oStyle.lineHeight = lineHeight === 'normal' ? 1 : lineHeight;\n      }\n    },\n\n    /**\n     * Parses an SVG document, returning all of the gradient declarations found in it\n     * @static\n     * @function\n     * @memberOf fabric\n     * @param {SVGDocument} doc SVG document to parse\n     * @return {Object} Gradient definitions; key corresponds to element id, value -- to gradient definition element\n     */\n    getGradientDefs: function(doc) {\n      var tagArray = [\n            'linearGradient',\n            'radialGradient',\n            'svg:linearGradient',\n            'svg:radialGradient'],\n          elList = _getMultipleNodes(doc, tagArray),\n          el, j = 0, gradientDefs = { };\n      j = elList.length;\n      while (j--) {\n        el = elList[j];\n        if (el.getAttribute('xlink:href')) {\n          recursivelyParseGradientsXlink(doc, el);\n        }\n        gradientDefs[el.getAttribute('id')] = el;\n      }\n      return gradientDefs;\n    },\n\n    /**\n     * Returns an object of attributes' name/value, given element and an array of attribute names;\n     * Parses parent \"g\" nodes recursively upwards.\n     * @static\n     * @memberOf fabric\n     * @param {DOMElement} element Element to parse\n     * @param {Array} attributes Array of attributes to parse\n     * @return {Object} object containing parsed attributes' names/values\n     */\n    parseAttributes: function(element, attributes, svgUid) {\n\n      if (!element) {\n        return;\n      }\n\n      var value,\n          parentAttributes = { },\n          fontSize, parentFontSize;\n\n      if (typeof svgUid === 'undefined') {\n        svgUid = element.getAttribute('svgUid');\n      }\n      // if there's a parent container (`g` or `a` or `symbol` node), parse its attributes recursively upwards\n      if (element.parentNode && fabric.svgValidParentsRegEx.test(element.parentNode.nodeName)) {\n        parentAttributes = fabric.parseAttributes(element.parentNode, attributes, svgUid);\n      }\n\n      var ownAttributes = attributes.reduce(function(memo, attr) {\n        value = element.getAttribute(attr);\n        if (value) { // eslint-disable-line\n          memo[attr] = value;\n        }\n        return memo;\n      }, { });\n      // add values parsed from style, which take precedence over attributes\n      // (see: http://www.w3.org/TR/SVG/styling.html#UsingPresentationAttributes)\n      ownAttributes = extend(ownAttributes,\n        extend(getGlobalStylesForElement(element, svgUid), fabric.parseStyleAttribute(element)));\n\n      fontSize = parentFontSize = parentAttributes.fontSize || fabric.Text.DEFAULT_SVG_FONT_SIZE;\n      if (ownAttributes['font-size']) {\n        // looks like the minimum should be 9px when dealing with ems. this is what looks like in browsers.\n        ownAttributes['font-size'] = fontSize = parseUnit(ownAttributes['font-size'], parentFontSize);\n      }\n\n      var normalizedAttr, normalizedValue, normalizedStyle = {};\n      for (var attr in ownAttributes) {\n        normalizedAttr = normalizeAttr(attr);\n        normalizedValue = normalizeValue(normalizedAttr, ownAttributes[attr], parentAttributes, fontSize);\n        normalizedStyle[normalizedAttr] = normalizedValue;\n      }\n      if (normalizedStyle && normalizedStyle.font) {\n        fabric.parseFontDeclaration(normalizedStyle.font, normalizedStyle);\n      }\n      var mergedAttrs = extend(parentAttributes, normalizedStyle);\n      return fabric.svgValidParentsRegEx.test(element.nodeName) ? mergedAttrs : _setStrokeFillOpacity(mergedAttrs);\n    },\n\n    /**\n     * Transforms an array of svg elements to corresponding fabric.* instances\n     * @static\n     * @memberOf fabric\n     * @param {Array} elements Array of elements to parse\n     * @param {Function} callback Being passed an array of fabric instances (transformed from SVG elements)\n     * @param {Object} [options] Options object\n     * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n     */\n    parseElements: function(elements, callback, options, reviver, parsingOptions) {\n      new fabric.ElementsParser(elements, callback, options, reviver, parsingOptions).parse();\n    },\n\n    /**\n     * Parses \"style\" attribute, retuning an object with values\n     * @static\n     * @memberOf fabric\n     * @param {SVGElement} element Element to parse\n     * @return {Object} Objects with values parsed from style attribute of an element\n     */\n    parseStyleAttribute: function(element) {\n      var oStyle = { },\n          style = element.getAttribute('style');\n\n      if (!style) {\n        return oStyle;\n      }\n\n      if (typeof style === 'string') {\n        parseStyleString(style, oStyle);\n      }\n      else {\n        parseStyleObject(style, oStyle);\n      }\n\n      return oStyle;\n    },\n\n    /**\n     * Parses \"points\" attribute, returning an array of values\n     * @static\n     * @memberOf fabric\n     * @param {String} points points attribute string\n     * @return {Array} array of points\n     */\n    parsePointsAttribute: function(points) {\n\n      // points attribute is required and must not be empty\n      if (!points) {\n        return null;\n      }\n\n      // replace commas with whitespace and remove bookending whitespace\n      points = points.replace(/,/g, ' ').trim();\n\n      points = points.split(/\\s+/);\n      var parsedPoints = [], i, len;\n\n      for (i = 0, len = points.length; i < len; i += 2) {\n        parsedPoints.push({\n          x: parseFloat(points[i]),\n          y: parseFloat(points[i + 1])\n        });\n      }\n\n      // odd number of points is an error\n      // if (parsedPoints.length % 2 !== 0) {\n      //   return null;\n      // }\n\n      return parsedPoints;\n    },\n\n    /**\n     * Returns CSS rules for a given SVG document\n     * @static\n     * @function\n     * @memberOf fabric\n     * @param {SVGDocument} doc SVG document to parse\n     * @return {Object} CSS rules of this document\n     */\n    getCSSRules: function(doc) {\n      var styles = doc.getElementsByTagName('style'), i, len,\n          allRules = { }, rules;\n\n      // very crude parsing of style contents\n      for (i = 0, len = styles.length; i < len; i++) {\n        // IE9 doesn't support textContent, but provides text instead.\n        var styleContents = styles[i].textContent || styles[i].text;\n\n        // remove comments\n        styleContents = styleContents.replace(/\\/\\*[\\s\\S]*?\\*\\//g, '');\n        if (styleContents.trim() === '') {\n          continue;\n        }\n        rules = styleContents.match(/[^{]*\\{[\\s\\S]*?\\}/g);\n        rules = rules.map(function(rule) { return rule.trim(); });\n        // eslint-disable-next-line no-loop-func\n        rules.forEach(function(rule) {\n\n          var match = rule.match(/([\\s\\S]*?)\\s*\\{([^}]*)\\}/),\n              ruleObj = { }, declaration = match[2].trim(),\n              propertyValuePairs = declaration.replace(/;$/, '').split(/\\s*;\\s*/);\n\n          for (i = 0, len = propertyValuePairs.length; i < len; i++) {\n            var pair = propertyValuePairs[i].split(/\\s*:\\s*/),\n                property = pair[0],\n                value = pair[1];\n            ruleObj[property] = value;\n          }\n          rule = match[1];\n          rule.split(',').forEach(function(_rule) {\n            _rule = _rule.replace(/^svg/i, '').trim();\n            if (_rule === '') {\n              return;\n            }\n            if (allRules[_rule]) {\n              fabric.util.object.extend(allRules[_rule], ruleObj);\n            }\n            else {\n              allRules[_rule] = fabric.util.object.clone(ruleObj);\n            }\n          });\n        });\n      }\n      return allRules;\n    },\n\n    /**\n     * Takes url corresponding to an SVG document, and parses it into a set of fabric objects.\n     * Note that SVG is fetched via XMLHttpRequest, so it needs to conform to SOP (Same Origin Policy)\n     * @memberOf fabric\n     * @param {String} url\n     * @param {Function} callback\n     * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n     * @param {Object} [options] Object containing options for parsing\n     * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n     */\n    loadSVGFromURL: function(url, callback, reviver, options) {\n\n      url = url.replace(/^\\n\\s*/, '').trim();\n      new fabric.util.request(url, {\n        method: 'get',\n        onComplete: onComplete\n      });\n\n      function onComplete(r) {\n\n        var xml = r.responseXML;\n        if (xml && !xml.documentElement && fabric.window.ActiveXObject && r.responseText) {\n          xml = new ActiveXObject('Microsoft.XMLDOM');\n          xml.async = 'false';\n          //IE chokes on DOCTYPE\n          xml.loadXML(r.responseText.replace(/<!DOCTYPE[\\s\\S]*?(\\[[\\s\\S]*\\])*?>/i, ''));\n        }\n        if (!xml || !xml.documentElement) {\n          callback && callback(null);\n          return false;\n        }\n\n        fabric.parseSVGDocument(xml.documentElement, function (results, _options, elements, allElements) {\n          callback && callback(results, _options, elements, allElements);\n        }, reviver, options);\n      }\n    },\n\n    /**\n     * Takes string corresponding to an SVG document, and parses it into a set of fabric objects\n     * @memberOf fabric\n     * @param {String} string\n     * @param {Function} callback\n     * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n     * @param {Object} [options] Object containing options for parsing\n     * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n     */\n    loadSVGFromString: function(string, callback, reviver, options) {\n      string = string.trim();\n      var doc;\n      if (typeof fabric.window.DOMParser !== 'undefined') {\n        var parser = new fabric.window.DOMParser();\n        if (parser && parser.parseFromString) {\n          doc = parser.parseFromString(string, 'text/xml');\n        }\n      }\n      else if (fabric.window.ActiveXObject) {\n        doc = new ActiveXObject('Microsoft.XMLDOM');\n        doc.async = 'false';\n        // IE chokes on DOCTYPE\n        doc.loadXML(string.replace(/<!DOCTYPE[\\s\\S]*?(\\[[\\s\\S]*\\])*?>/i, ''));\n      }\n\n      fabric.parseSVGDocument(doc.documentElement, function (results, _options, elements, allElements) {\n        callback(results, _options, elements, allElements);\n      }, reviver, options);\n    }\n  });\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\nfabric.ElementsParser = function(elements, callback, options, reviver, parsingOptions) {\n  this.elements = elements;\n  this.callback = callback;\n  this.options = options;\n  this.reviver = reviver;\n  this.svgUid = (options && options.svgUid) || 0;\n  this.parsingOptions = parsingOptions;\n  this.regexUrl = /^url\\(['\"]?#([^'\"]+)['\"]?\\)/g;\n};\n\n(function(proto) {\n  proto.parse = function() {\n    this.instances = new Array(this.elements.length);\n    this.numElements = this.elements.length;\n    this.createObjects();\n  };\n\n  proto.createObjects = function() {\n    var _this = this;\n    this.elements.forEach(function(element, i) {\n      element.setAttribute('svgUid', _this.svgUid);\n      _this.createObject(element, i);\n    });\n  };\n\n  proto.findTag = function(el) {\n    return fabric[fabric.util.string.capitalize(el.tagName.replace('svg:', ''))];\n  };\n\n  proto.createObject = function(el, index) {\n    var klass = this.findTag(el);\n    if (klass && klass.fromElement) {\n      try {\n        klass.fromElement(el, this.createCallback(index, el), this.options);\n      }\n      catch (err) {\n        fabric.log(err);\n      }\n    }\n    else {\n      this.checkIfDone();\n    }\n  };\n\n  proto.createCallback = function(index, el) {\n    var _this = this;\n    return function(obj) {\n      var _options;\n      _this.resolveGradient(obj, 'fill');\n      _this.resolveGradient(obj, 'stroke');\n      if (obj instanceof fabric.Image && obj._originalElement) {\n        _options = obj.parsePreserveAspectRatioAttribute(el);\n      }\n      obj._removeTransformMatrix(_options);\n      _this.resolveClipPath(obj);\n      _this.reviver && _this.reviver(el, obj);\n      _this.instances[index] = obj;\n      _this.checkIfDone();\n    };\n  };\n\n  proto.extractPropertyDefinition = function(obj, property, storage) {\n    var value = obj[property];\n    if (!(/^url\\(/).test(value)) {\n      return;\n    }\n    var id = this.regexUrl.exec(value)[1];\n    this.regexUrl.lastIndex = 0;\n    return fabric[storage][this.svgUid][id];\n  };\n\n  proto.resolveGradient = function(obj, property) {\n    var gradientDef = this.extractPropertyDefinition(obj, property, 'gradientDefs');\n    if (gradientDef) {\n      obj.set(property, fabric.Gradient.fromElement(gradientDef, obj));\n    }\n  };\n\n  proto.createClipPathCallback = function(obj, container) {\n    return function(_newObj) {\n      _newObj._removeTransformMatrix();\n      _newObj.fillRule = _newObj.clipRule;\n      container.push(_newObj);\n    };\n  };\n\n  proto.resolveClipPath = function(obj) {\n    var clipPath = this.extractPropertyDefinition(obj, 'clipPath', 'clipPaths'),\n        element, klass, objTransformInv, container, gTransform, options;\n    if (clipPath) {\n      container = [];\n      objTransformInv = fabric.util.invertTransform(obj.calcTransformMatrix());\n      for (var i = 0; i < clipPath.length; i++) {\n        element = clipPath[i];\n        klass = this.findTag(element);\n        klass.fromElement(\n          element,\n          this.createClipPathCallback(obj, container),\n          this.options\n        );\n      }\n      if (container.length === 1) {\n        clipPath = container[0];\n      }\n      else {\n        clipPath = new fabric.Group(container);\n      }\n      gTransform = fabric.util.multiplyTransformMatrices(\n        objTransformInv,\n        clipPath.calcTransformMatrix()\n      );\n      var options = fabric.util.qrDecompose(gTransform);\n      clipPath.flipX = false;\n      clipPath.flipY = false;\n      clipPath.set('scaleX', options.scaleX);\n      clipPath.set('scaleY', options.scaleY);\n      clipPath.angle = options.angle;\n      clipPath.skewX = options.skewX;\n      clipPath.skewY = 0;\n      clipPath.setPositionByOrigin({ x: options.translateX, y: options.translateY }, 'center', 'center');\n      obj.clipPath = clipPath;\n    }\n  };\n\n  proto.checkIfDone = function() {\n    if (--this.numElements === 0) {\n      this.instances = this.instances.filter(function(el) {\n        // eslint-disable-next-line no-eq-null, eqeqeq\n        return el != null;\n      });\n      this.callback(this.instances, this.elements);\n    }\n  };\n})(fabric.ElementsParser.prototype);\n\n\n(function(global) {\n\n  'use strict';\n\n  /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n\n  var fabric = global.fabric || (global.fabric = { });\n\n  if (fabric.Point) {\n    fabric.warn('fabric.Point is already defined');\n    return;\n  }\n\n  fabric.Point = Point;\n\n  /**\n   * Point class\n   * @class fabric.Point\n   * @memberOf fabric\n   * @constructor\n   * @param {Number} x\n   * @param {Number} y\n   * @return {fabric.Point} thisArg\n   */\n  function Point(x, y) {\n    this.x = x;\n    this.y = y;\n  }\n\n  Point.prototype = /** @lends fabric.Point.prototype */ {\n\n    type: 'point',\n\n    constructor: Point,\n\n    /**\n     * Adds another point to this one and returns another one\n     * @param {fabric.Point} that\n     * @return {fabric.Point} new Point instance with added values\n     */\n    add: function (that) {\n      return new Point(this.x + that.x, this.y + that.y);\n    },\n\n    /**\n     * Adds another point to this one\n     * @param {fabric.Point} that\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    addEquals: function (that) {\n      this.x += that.x;\n      this.y += that.y;\n      return this;\n    },\n\n    /**\n     * Adds value to this point and returns a new one\n     * @param {Number} scalar\n     * @return {fabric.Point} new Point with added value\n     */\n    scalarAdd: function (scalar) {\n      return new Point(this.x + scalar, this.y + scalar);\n    },\n\n    /**\n     * Adds value to this point\n     * @param {Number} scalar\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    scalarAddEquals: function (scalar) {\n      this.x += scalar;\n      this.y += scalar;\n      return this;\n    },\n\n    /**\n     * Subtracts another point from this point and returns a new one\n     * @param {fabric.Point} that\n     * @return {fabric.Point} new Point object with subtracted values\n     */\n    subtract: function (that) {\n      return new Point(this.x - that.x, this.y - that.y);\n    },\n\n    /**\n     * Subtracts another point from this point\n     * @param {fabric.Point} that\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    subtractEquals: function (that) {\n      this.x -= that.x;\n      this.y -= that.y;\n      return this;\n    },\n\n    /**\n     * Subtracts value from this point and returns a new one\n     * @param {Number} scalar\n     * @return {fabric.Point}\n     */\n    scalarSubtract: function (scalar) {\n      return new Point(this.x - scalar, this.y - scalar);\n    },\n\n    /**\n     * Subtracts value from this point\n     * @param {Number} scalar\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    scalarSubtractEquals: function (scalar) {\n      this.x -= scalar;\n      this.y -= scalar;\n      return this;\n    },\n\n    /**\n     * Multiplies this point by a value and returns a new one\n     * TODO: rename in scalarMultiply in 2.0\n     * @param {Number} scalar\n     * @return {fabric.Point}\n     */\n    multiply: function (scalar) {\n      return new Point(this.x * scalar, this.y * scalar);\n    },\n\n    /**\n     * Multiplies this point by a value\n     * TODO: rename in scalarMultiplyEquals in 2.0\n     * @param {Number} scalar\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    multiplyEquals: function (scalar) {\n      this.x *= scalar;\n      this.y *= scalar;\n      return this;\n    },\n\n    /**\n     * Divides this point by a value and returns a new one\n     * TODO: rename in scalarDivide in 2.0\n     * @param {Number} scalar\n     * @return {fabric.Point}\n     */\n    divide: function (scalar) {\n      return new Point(this.x / scalar, this.y / scalar);\n    },\n\n    /**\n     * Divides this point by a value\n     * TODO: rename in scalarDivideEquals in 2.0\n     * @param {Number} scalar\n     * @return {fabric.Point} thisArg\n     * @chainable\n     */\n    divideEquals: function (scalar) {\n      this.x /= scalar;\n      this.y /= scalar;\n      return this;\n    },\n\n    /**\n     * Returns true if this point is equal to another one\n     * @param {fabric.Point} that\n     * @return {Boolean}\n     */\n    eq: function (that) {\n      return (this.x === that.x && this.y === that.y);\n    },\n\n    /**\n     * Returns true if this point is less than another one\n     * @param {fabric.Point} that\n     * @return {Boolean}\n     */\n    lt: function (that) {\n      return (this.x < that.x && this.y < that.y);\n    },\n\n    /**\n     * Returns true if this point is less than or equal to another one\n     * @param {fabric.Point} that\n     * @return {Boolean}\n     */\n    lte: function (that) {\n      return (this.x <= that.x && this.y <= that.y);\n    },\n\n    /**\n\n     * Returns true if this point is greater another one\n     * @param {fabric.Point} that\n     * @return {Boolean}\n     */\n    gt: function (that) {\n      return (this.x > that.x && this.y > that.y);\n    },\n\n    /**\n     * Returns true if this point is greater than or equal to another one\n     * @param {fabric.Point} that\n     * @return {Boolean}\n     */\n    gte: function (that) {\n      return (this.x >= that.x && this.y >= that.y);\n    },\n\n    /**\n     * Returns new point which is the result of linear interpolation with this one and another one\n     * @param {fabric.Point} that\n     * @param {Number} t , position of interpolation, between 0 and 1 default 0.5\n     * @return {fabric.Point}\n     */\n    lerp: function (that, t) {\n      if (typeof t === 'undefined') {\n        t = 0.5;\n      }\n      t = Math.max(Math.min(1, t), 0);\n      return new Point(this.x + (that.x - this.x) * t, this.y + (that.y - this.y) * t);\n    },\n\n    /**\n     * Returns distance from this point and another one\n     * @param {fabric.Point} that\n     * @return {Number}\n     */\n    distanceFrom: function (that) {\n      var dx = this.x - that.x,\n          dy = this.y - that.y;\n      return Math.sqrt(dx * dx + dy * dy);\n    },\n\n    /**\n     * Returns the point between this point and another one\n     * @param {fabric.Point} that\n     * @return {fabric.Point}\n     */\n    midPointFrom: function (that) {\n      return this.lerp(that);\n    },\n\n    /**\n     * Returns a new point which is the min of this and another one\n     * @param {fabric.Point} that\n     * @return {fabric.Point}\n     */\n    min: function (that) {\n      return new Point(Math.min(this.x, that.x), Math.min(this.y, that.y));\n    },\n\n    /**\n     * Returns a new point which is the max of this and another one\n     * @param {fabric.Point} that\n     * @return {fabric.Point}\n     */\n    max: function (that) {\n      return new Point(Math.max(this.x, that.x), Math.max(this.y, that.y));\n    },\n\n    /**\n     * Returns string representation of this point\n     * @return {String}\n     */\n    toString: function () {\n      return this.x + ',' + this.y;\n    },\n\n    /**\n     * Sets x/y of this point\n     * @param {Number} x\n     * @param {Number} y\n     * @chainable\n     */\n    setXY: function (x, y) {\n      this.x = x;\n      this.y = y;\n      return this;\n    },\n\n    /**\n     * Sets x of this point\n     * @param {Number} x\n     * @chainable\n     */\n    setX: function (x) {\n      this.x = x;\n      return this;\n    },\n\n    /**\n     * Sets y of this point\n     * @param {Number} y\n     * @chainable\n     */\n    setY: function (y) {\n      this.y = y;\n      return this;\n    },\n\n    /**\n     * Sets x/y of this point from another point\n     * @param {fabric.Point} that\n     * @chainable\n     */\n    setFromPoint: function (that) {\n      this.x = that.x;\n      this.y = that.y;\n      return this;\n    },\n\n    /**\n     * Swaps x/y of this point and another point\n     * @param {fabric.Point} that\n     */\n    swap: function (that) {\n      var x = this.x,\n          y = this.y;\n      this.x = that.x;\n      this.y = that.y;\n      that.x = x;\n      that.y = y;\n    },\n\n    /**\n     * return a cloned instance of the point\n     * @return {fabric.Point}\n     */\n    clone: function () {\n      return new Point(this.x, this.y);\n    }\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n  var fabric = global.fabric || (global.fabric = { });\n\n  if (fabric.Intersection) {\n    fabric.warn('fabric.Intersection is already defined');\n    return;\n  }\n\n  /**\n   * Intersection class\n   * @class fabric.Intersection\n   * @memberOf fabric\n   * @constructor\n   */\n  function Intersection(status) {\n    this.status = status;\n    this.points = [];\n  }\n\n  fabric.Intersection = Intersection;\n\n  fabric.Intersection.prototype = /** @lends fabric.Intersection.prototype */ {\n\n    constructor: Intersection,\n\n    /**\n     * Appends a point to intersection\n     * @param {fabric.Point} point\n     * @return {fabric.Intersection} thisArg\n     * @chainable\n     */\n    appendPoint: function (point) {\n      this.points.push(point);\n      return this;\n    },\n\n    /**\n     * Appends points to intersection\n     * @param {Array} points\n     * @return {fabric.Intersection} thisArg\n     * @chainable\n     */\n    appendPoints: function (points) {\n      this.points = this.points.concat(points);\n      return this;\n    }\n  };\n\n  /**\n   * Checks if one line intersects another\n   * TODO: rename in intersectSegmentSegment\n   * @static\n   * @param {fabric.Point} a1\n   * @param {fabric.Point} a2\n   * @param {fabric.Point} b1\n   * @param {fabric.Point} b2\n   * @return {fabric.Intersection}\n   */\n  fabric.Intersection.intersectLineLine = function (a1, a2, b1, b2) {\n    var result,\n        uaT = (b2.x - b1.x) * (a1.y - b1.y) - (b2.y - b1.y) * (a1.x - b1.x),\n        ubT = (a2.x - a1.x) * (a1.y - b1.y) - (a2.y - a1.y) * (a1.x - b1.x),\n        uB = (b2.y - b1.y) * (a2.x - a1.x) - (b2.x - b1.x) * (a2.y - a1.y);\n    if (uB !== 0) {\n      var ua = uaT / uB,\n          ub = ubT / uB;\n      if (0 <= ua && ua <= 1 && 0 <= ub && ub <= 1) {\n        result = new Intersection('Intersection');\n        result.appendPoint(new fabric.Point(a1.x + ua * (a2.x - a1.x), a1.y + ua * (a2.y - a1.y)));\n      }\n      else {\n        result = new Intersection();\n      }\n    }\n    else {\n      if (uaT === 0 || ubT === 0) {\n        result = new Intersection('Coincident');\n      }\n      else {\n        result = new Intersection('Parallel');\n      }\n    }\n    return result;\n  };\n\n  /**\n   * Checks if line intersects polygon\n   * TODO: rename in intersectSegmentPolygon\n   * fix detection of coincident\n   * @static\n   * @param {fabric.Point} a1\n   * @param {fabric.Point} a2\n   * @param {Array} points\n   * @return {fabric.Intersection}\n   */\n  fabric.Intersection.intersectLinePolygon = function(a1, a2, points) {\n    var result = new Intersection(),\n        length = points.length,\n        b1, b2, inter, i;\n\n    for (i = 0; i < length; i++) {\n      b1 = points[i];\n      b2 = points[(i + 1) % length];\n      inter = Intersection.intersectLineLine(a1, a2, b1, b2);\n\n      result.appendPoints(inter.points);\n    }\n    if (result.points.length > 0) {\n      result.status = 'Intersection';\n    }\n    return result;\n  };\n\n  /**\n   * Checks if polygon intersects another polygon\n   * @static\n   * @param {Array} points1\n   * @param {Array} points2\n   * @return {fabric.Intersection}\n   */\n  fabric.Intersection.intersectPolygonPolygon = function (points1, points2) {\n    var result = new Intersection(),\n        length = points1.length, i;\n\n    for (i = 0; i < length; i++) {\n      var a1 = points1[i],\n          a2 = points1[(i + 1) % length],\n          inter = Intersection.intersectLinePolygon(a1, a2, points2);\n\n      result.appendPoints(inter.points);\n    }\n    if (result.points.length > 0) {\n      result.status = 'Intersection';\n    }\n    return result;\n  };\n\n  /**\n   * Checks if polygon intersects rectangle\n   * @static\n   * @param {Array} points\n   * @param {fabric.Point} r1\n   * @param {fabric.Point} r2\n   * @return {fabric.Intersection}\n   */\n  fabric.Intersection.intersectPolygonRectangle = function (points, r1, r2) {\n    var min = r1.min(r2),\n        max = r1.max(r2),\n        topRight = new fabric.Point(max.x, min.y),\n        bottomLeft = new fabric.Point(min.x, max.y),\n        inter1 = Intersection.intersectLinePolygon(min, topRight, points),\n        inter2 = Intersection.intersectLinePolygon(topRight, max, points),\n        inter3 = Intersection.intersectLinePolygon(max, bottomLeft, points),\n        inter4 = Intersection.intersectLinePolygon(bottomLeft, min, points),\n        result = new Intersection();\n\n    result.appendPoints(inter1.points);\n    result.appendPoints(inter2.points);\n    result.appendPoints(inter3.points);\n    result.appendPoints(inter4.points);\n\n    if (result.points.length > 0) {\n      result.status = 'Intersection';\n    }\n    return result;\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { });\n\n  if (fabric.Color) {\n    fabric.warn('fabric.Color is already defined.');\n    return;\n  }\n\n  /**\n   * Color class\n   * The purpose of {@link fabric.Color} is to abstract and encapsulate common color operations;\n   * {@link fabric.Color} is a constructor and creates instances of {@link fabric.Color} objects.\n   *\n   * @class fabric.Color\n   * @param {String} color optional in hex or rgb(a) or hsl format or from known color list\n   * @return {fabric.Color} thisArg\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-2/#colors}\n   */\n  function Color(color) {\n    if (!color) {\n      this.setSource([0, 0, 0, 1]);\n    }\n    else {\n      this._tryParsingColor(color);\n    }\n  }\n\n  fabric.Color = Color;\n\n  fabric.Color.prototype = /** @lends fabric.Color.prototype */ {\n\n    /**\n     * @private\n     * @param {String|Array} color Color value to parse\n     */\n    _tryParsingColor: function(color) {\n      var source;\n\n      if (color in Color.colorNameMap) {\n        color = Color.colorNameMap[color];\n      }\n\n      if (color === 'transparent') {\n        source = [255, 255, 255, 0];\n      }\n\n      if (!source) {\n        source = Color.sourceFromHex(color);\n      }\n      if (!source) {\n        source = Color.sourceFromRgb(color);\n      }\n      if (!source) {\n        source = Color.sourceFromHsl(color);\n      }\n      if (!source) {\n        //if color is not recognize let's make black as canvas does\n        source = [0, 0, 0, 1];\n      }\n      if (source) {\n        this.setSource(source);\n      }\n    },\n\n    /**\n     * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n     * @private\n     * @param {Number} r Red color value\n     * @param {Number} g Green color value\n     * @param {Number} b Blue color value\n     * @return {Array} Hsl color\n     */\n    _rgbToHsl: function(r, g, b) {\n      r /= 255; g /= 255; b /= 255;\n\n      var h, s, l,\n          max = fabric.util.array.max([r, g, b]),\n          min = fabric.util.array.min([r, g, b]);\n\n      l = (max + min) / 2;\n\n      if (max === min) {\n        h = s = 0; // achromatic\n      }\n      else {\n        var d = max - min;\n        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);\n        switch (max) {\n          case r:\n            h = (g - b) / d + (g < b ? 6 : 0);\n            break;\n          case g:\n            h = (b - r) / d + 2;\n            break;\n          case b:\n            h = (r - g) / d + 4;\n            break;\n        }\n        h /= 6;\n      }\n\n      return [\n        Math.round(h * 360),\n        Math.round(s * 100),\n        Math.round(l * 100)\n      ];\n    },\n\n    /**\n     * Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n     * @return {Array}\n     */\n    getSource: function() {\n      return this._source;\n    },\n\n    /**\n     * Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n     * @param {Array} source\n     */\n    setSource: function(source) {\n      this._source = source;\n    },\n\n    /**\n     * Returns color representation in RGB format\n     * @return {String} ex: rgb(0-255,0-255,0-255)\n     */\n    toRgb: function() {\n      var source = this.getSource();\n      return 'rgb(' + source[0] + ',' + source[1] + ',' + source[2] + ')';\n    },\n\n    /**\n     * Returns color representation in RGBA format\n     * @return {String} ex: rgba(0-255,0-255,0-255,0-1)\n     */\n    toRgba: function() {\n      var source = this.getSource();\n      return 'rgba(' + source[0] + ',' + source[1] + ',' + source[2] + ',' + source[3] + ')';\n    },\n\n    /**\n     * Returns color representation in HSL format\n     * @return {String} ex: hsl(0-360,0%-100%,0%-100%)\n     */\n    toHsl: function() {\n      var source = this.getSource(),\n          hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n      return 'hsl(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%)';\n    },\n\n    /**\n     * Returns color representation in HSLA format\n     * @return {String} ex: hsla(0-360,0%-100%,0%-100%,0-1)\n     */\n    toHsla: function() {\n      var source = this.getSource(),\n          hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n      return 'hsla(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%,' + source[3] + ')';\n    },\n\n    /**\n     * Returns color representation in HEX format\n     * @return {String} ex: FF5555\n     */\n    toHex: function() {\n      var source = this.getSource(), r, g, b;\n\n      r = source[0].toString(16);\n      r = (r.length === 1) ? ('0' + r) : r;\n\n      g = source[1].toString(16);\n      g = (g.length === 1) ? ('0' + g) : g;\n\n      b = source[2].toString(16);\n      b = (b.length === 1) ? ('0' + b) : b;\n\n      return r.toUpperCase() + g.toUpperCase() + b.toUpperCase();\n    },\n\n    /**\n     * Returns color representation in HEXA format\n     * @return {String} ex: FF5555CC\n     */\n    toHexa: function() {\n      var source = this.getSource(), a;\n\n      a = Math.round(source[3] * 255);\n      a = a.toString(16);\n      a = (a.length === 1) ? ('0' + a) : a;\n\n      return this.toHex() + a.toUpperCase();\n    },\n\n    /**\n     * Gets value of alpha channel for this color\n     * @return {Number} 0-1\n     */\n    getAlpha: function() {\n      return this.getSource()[3];\n    },\n\n    /**\n     * Sets value of alpha channel for this color\n     * @param {Number} alpha Alpha value 0-1\n     * @return {fabric.Color} thisArg\n     */\n    setAlpha: function(alpha) {\n      var source = this.getSource();\n      source[3] = alpha;\n      this.setSource(source);\n      return this;\n    },\n\n    /**\n     * Transforms color to its grayscale representation\n     * @return {fabric.Color} thisArg\n     */\n    toGrayscale: function() {\n      var source = this.getSource(),\n          average = parseInt((source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0), 10),\n          currentAlpha = source[3];\n      this.setSource([average, average, average, currentAlpha]);\n      return this;\n    },\n\n    /**\n     * Transforms color to its black and white representation\n     * @param {Number} threshold\n     * @return {fabric.Color} thisArg\n     */\n    toBlackWhite: function(threshold) {\n      var source = this.getSource(),\n          average = (source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0),\n          currentAlpha = source[3];\n\n      threshold = threshold || 127;\n\n      average = (Number(average) < Number(threshold)) ? 0 : 255;\n      this.setSource([average, average, average, currentAlpha]);\n      return this;\n    },\n\n    /**\n     * Overlays color with another color\n     * @param {String|fabric.Color} otherColor\n     * @return {fabric.Color} thisArg\n     */\n    overlayWith: function(otherColor) {\n      if (!(otherColor instanceof Color)) {\n        otherColor = new Color(otherColor);\n      }\n\n      var result = [],\n          alpha = this.getAlpha(),\n          otherAlpha = 0.5,\n          source = this.getSource(),\n          otherSource = otherColor.getSource(), i;\n\n      for (i = 0; i < 3; i++) {\n        result.push(Math.round((source[i] * (1 - otherAlpha)) + (otherSource[i] * otherAlpha)));\n      }\n\n      result[3] = alpha;\n      this.setSource(result);\n      return this;\n    }\n  };\n\n  /**\n   * Regex matching color in RGB or RGBA formats (ex: rgb(0, 0, 0), rgba(255, 100, 10, 0.5), rgba( 255 , 100 , 10 , 0.5 ), rgb(1,1,1), rgba(100%, 60%, 10%, 0.5))\n   * @static\n   * @field\n   * @memberOf fabric.Color\n   */\n  // eslint-disable-next-line max-len\n  fabric.Color.reRGBa = /^rgba?\\(\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*(?:\\s*,\\s*((?:\\d*\\.?\\d+)?)\\s*)?\\)$/i;\n\n  /**\n   * Regex matching color in HSL or HSLA formats (ex: hsl(200, 80%, 10%), hsla(300, 50%, 80%, 0.5), hsla( 300 , 50% , 80% , 0.5 ))\n   * @static\n   * @field\n   * @memberOf fabric.Color\n   */\n  fabric.Color.reHSLa = /^hsla?\\(\\s*(\\d{1,3})\\s*,\\s*(\\d{1,3}\\%)\\s*,\\s*(\\d{1,3}\\%)\\s*(?:\\s*,\\s*(\\d+(?:\\.\\d+)?)\\s*)?\\)$/i;\n\n  /**\n   * Regex matching color in HEX format (ex: #FF5544CC, #FF5555, 010155, aff)\n   * @static\n   * @field\n   * @memberOf fabric.Color\n   */\n  fabric.Color.reHex = /^#?([0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{4}|[0-9a-f]{3})$/i;\n\n  /**\n   * Map of the 148 color names with HEX code\n   * @static\n   * @field\n   * @memberOf fabric.Color\n   * @see: https://www.w3.org/TR/css3-color/#svg-color\n   */\n  fabric.Color.colorNameMap = {\n    aliceblue:            '#F0F8FF',\n    antiquewhite:         '#FAEBD7',\n    aqua:                 '#00FFFF',\n    aquamarine:           '#7FFFD4',\n    azure:                '#F0FFFF',\n    beige:                '#F5F5DC',\n    bisque:               '#FFE4C4',\n    black:                '#000000',\n    blanchedalmond:       '#FFEBCD',\n    blue:                 '#0000FF',\n    blueviolet:           '#8A2BE2',\n    brown:                '#A52A2A',\n    burlywood:            '#DEB887',\n    cadetblue:            '#5F9EA0',\n    chartreuse:           '#7FFF00',\n    chocolate:            '#D2691E',\n    coral:                '#FF7F50',\n    cornflowerblue:       '#6495ED',\n    cornsilk:             '#FFF8DC',\n    crimson:              '#DC143C',\n    cyan:                 '#00FFFF',\n    darkblue:             '#00008B',\n    darkcyan:             '#008B8B',\n    darkgoldenrod:        '#B8860B',\n    darkgray:             '#A9A9A9',\n    darkgrey:             '#A9A9A9',\n    darkgreen:            '#006400',\n    darkkhaki:            '#BDB76B',\n    darkmagenta:          '#8B008B',\n    darkolivegreen:       '#556B2F',\n    darkorange:           '#FF8C00',\n    darkorchid:           '#9932CC',\n    darkred:              '#8B0000',\n    darksalmon:           '#E9967A',\n    darkseagreen:         '#8FBC8F',\n    darkslateblue:        '#483D8B',\n    darkslategray:        '#2F4F4F',\n    darkslategrey:        '#2F4F4F',\n    darkturquoise:        '#00CED1',\n    darkviolet:           '#9400D3',\n    deeppink:             '#FF1493',\n    deepskyblue:          '#00BFFF',\n    dimgray:              '#696969',\n    dimgrey:              '#696969',\n    dodgerblue:           '#1E90FF',\n    firebrick:            '#B22222',\n    floralwhite:          '#FFFAF0',\n    forestgreen:          '#228B22',\n    fuchsia:              '#FF00FF',\n    gainsboro:            '#DCDCDC',\n    ghostwhite:           '#F8F8FF',\n    gold:                 '#FFD700',\n    goldenrod:            '#DAA520',\n    gray:                 '#808080',\n    grey:                 '#808080',\n    green:                '#008000',\n    greenyellow:          '#ADFF2F',\n    honeydew:             '#F0FFF0',\n    hotpink:              '#FF69B4',\n    indianred:            '#CD5C5C',\n    indigo:               '#4B0082',\n    ivory:                '#FFFFF0',\n    khaki:                '#F0E68C',\n    lavender:             '#E6E6FA',\n    lavenderblush:        '#FFF0F5',\n    lawngreen:            '#7CFC00',\n    lemonchiffon:         '#FFFACD',\n    lightblue:            '#ADD8E6',\n    lightcoral:           '#F08080',\n    lightcyan:            '#E0FFFF',\n    lightgoldenrodyellow: '#FAFAD2',\n    lightgray:            '#D3D3D3',\n    lightgrey:            '#D3D3D3',\n    lightgreen:           '#90EE90',\n    lightpink:            '#FFB6C1',\n    lightsalmon:          '#FFA07A',\n    lightseagreen:        '#20B2AA',\n    lightskyblue:         '#87CEFA',\n    lightslategray:       '#778899',\n    lightslategrey:       '#778899',\n    lightsteelblue:       '#B0C4DE',\n    lightyellow:          '#FFFFE0',\n    lime:                 '#00FF00',\n    limegreen:            '#32CD32',\n    linen:                '#FAF0E6',\n    magenta:              '#FF00FF',\n    maroon:               '#800000',\n    mediumaquamarine:     '#66CDAA',\n    mediumblue:           '#0000CD',\n    mediumorchid:         '#BA55D3',\n    mediumpurple:         '#9370DB',\n    mediumseagreen:       '#3CB371',\n    mediumslateblue:      '#7B68EE',\n    mediumspringgreen:    '#00FA9A',\n    mediumturquoise:      '#48D1CC',\n    mediumvioletred:      '#C71585',\n    midnightblue:         '#191970',\n    mintcream:            '#F5FFFA',\n    mistyrose:            '#FFE4E1',\n    moccasin:             '#FFE4B5',\n    navajowhite:          '#FFDEAD',\n    navy:                 '#000080',\n    oldlace:              '#FDF5E6',\n    olive:                '#808000',\n    olivedrab:            '#6B8E23',\n    orange:               '#FFA500',\n    orangered:            '#FF4500',\n    orchid:               '#DA70D6',\n    palegoldenrod:        '#EEE8AA',\n    palegreen:            '#98FB98',\n    paleturquoise:        '#AFEEEE',\n    palevioletred:        '#DB7093',\n    papayawhip:           '#FFEFD5',\n    peachpuff:            '#FFDAB9',\n    peru:                 '#CD853F',\n    pink:                 '#FFC0CB',\n    plum:                 '#DDA0DD',\n    powderblue:           '#B0E0E6',\n    purple:               '#800080',\n    rebeccapurple:        '#663399',\n    red:                  '#FF0000',\n    rosybrown:            '#BC8F8F',\n    royalblue:            '#4169E1',\n    saddlebrown:          '#8B4513',\n    salmon:               '#FA8072',\n    sandybrown:           '#F4A460',\n    seagreen:             '#2E8B57',\n    seashell:             '#FFF5EE',\n    sienna:               '#A0522D',\n    silver:               '#C0C0C0',\n    skyblue:              '#87CEEB',\n    slateblue:            '#6A5ACD',\n    slategray:            '#708090',\n    slategrey:            '#708090',\n    snow:                 '#FFFAFA',\n    springgreen:          '#00FF7F',\n    steelblue:            '#4682B4',\n    tan:                  '#D2B48C',\n    teal:                 '#008080',\n    thistle:              '#D8BFD8',\n    tomato:               '#FF6347',\n    turquoise:            '#40E0D0',\n    violet:               '#EE82EE',\n    wheat:                '#F5DEB3',\n    white:                '#FFFFFF',\n    whitesmoke:           '#F5F5F5',\n    yellow:               '#FFFF00',\n    yellowgreen:          '#9ACD32'\n  };\n\n  /**\n   * @private\n   * @param {Number} p\n   * @param {Number} q\n   * @param {Number} t\n   * @return {Number}\n   */\n  function hue2rgb(p, q, t) {\n    if (t < 0) {\n      t += 1;\n    }\n    if (t > 1) {\n      t -= 1;\n    }\n    if (t < 1 / 6) {\n      return p + (q - p) * 6 * t;\n    }\n    if (t < 1 / 2) {\n      return q;\n    }\n    if (t < 2 / 3) {\n      return p + (q - p) * (2 / 3 - t) * 6;\n    }\n    return p;\n  }\n\n  /**\n   * Returns new color object, when given a color in RGB format\n   * @memberOf fabric.Color\n   * @param {String} color Color value ex: rgb(0-255,0-255,0-255)\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromRgb = function(color) {\n    return Color.fromSource(Color.sourceFromRgb(color));\n  };\n\n  /**\n   * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format\n   * @memberOf fabric.Color\n   * @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)\n   * @return {Array} source\n   */\n  fabric.Color.sourceFromRgb = function(color) {\n    var match = color.match(Color.reRGBa);\n    if (match) {\n      var r = parseInt(match[1], 10) / (/%$/.test(match[1]) ? 100 : 1) * (/%$/.test(match[1]) ? 255 : 1),\n          g = parseInt(match[2], 10) / (/%$/.test(match[2]) ? 100 : 1) * (/%$/.test(match[2]) ? 255 : 1),\n          b = parseInt(match[3], 10) / (/%$/.test(match[3]) ? 100 : 1) * (/%$/.test(match[3]) ? 255 : 1);\n\n      return [\n        parseInt(r, 10),\n        parseInt(g, 10),\n        parseInt(b, 10),\n        match[4] ? parseFloat(match[4]) : 1\n      ];\n    }\n  };\n\n  /**\n   * Returns new color object, when given a color in RGBA format\n   * @static\n   * @function\n   * @memberOf fabric.Color\n   * @param {String} color\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromRgba = Color.fromRgb;\n\n  /**\n   * Returns new color object, when given a color in HSL format\n   * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)\n   * @memberOf fabric.Color\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromHsl = function(color) {\n    return Color.fromSource(Color.sourceFromHsl(color));\n  };\n\n  /**\n   * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.\n   * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n   * @memberOf fabric.Color\n   * @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)\n   * @return {Array} source\n   * @see http://http://www.w3.org/TR/css3-color/#hsl-color\n   */\n  fabric.Color.sourceFromHsl = function(color) {\n    var match = color.match(Color.reHSLa);\n    if (!match) {\n      return;\n    }\n\n    var h = (((parseFloat(match[1]) % 360) + 360) % 360) / 360,\n        s = parseFloat(match[2]) / (/%$/.test(match[2]) ? 100 : 1),\n        l = parseFloat(match[3]) / (/%$/.test(match[3]) ? 100 : 1),\n        r, g, b;\n\n    if (s === 0) {\n      r = g = b = l;\n    }\n    else {\n      var q = l <= 0.5 ? l * (s + 1) : l + s - l * s,\n          p = l * 2 - q;\n\n      r = hue2rgb(p, q, h + 1 / 3);\n      g = hue2rgb(p, q, h);\n      b = hue2rgb(p, q, h - 1 / 3);\n    }\n\n    return [\n      Math.round(r * 255),\n      Math.round(g * 255),\n      Math.round(b * 255),\n      match[4] ? parseFloat(match[4]) : 1\n    ];\n  };\n\n  /**\n   * Returns new color object, when given a color in HSLA format\n   * @static\n   * @function\n   * @memberOf fabric.Color\n   * @param {String} color\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromHsla = Color.fromHsl;\n\n  /**\n   * Returns new color object, when given a color in HEX format\n   * @static\n   * @memberOf fabric.Color\n   * @param {String} color Color value ex: FF5555\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromHex = function(color) {\n    return Color.fromSource(Color.sourceFromHex(color));\n  };\n\n  /**\n   * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HEX format\n   * @static\n   * @memberOf fabric.Color\n   * @param {String} color ex: FF5555 or FF5544CC (RGBa)\n   * @return {Array} source\n   */\n  fabric.Color.sourceFromHex = function(color) {\n    if (color.match(Color.reHex)) {\n      var value = color.slice(color.indexOf('#') + 1),\n          isShortNotation = (value.length === 3 || value.length === 4),\n          isRGBa = (value.length === 8 || value.length === 4),\n          r = isShortNotation ? (value.charAt(0) + value.charAt(0)) : value.substring(0, 2),\n          g = isShortNotation ? (value.charAt(1) + value.charAt(1)) : value.substring(2, 4),\n          b = isShortNotation ? (value.charAt(2) + value.charAt(2)) : value.substring(4, 6),\n          a = isRGBa ? (isShortNotation ? (value.charAt(3) + value.charAt(3)) : value.substring(6, 8)) : 'FF';\n\n      return [\n        parseInt(r, 16),\n        parseInt(g, 16),\n        parseInt(b, 16),\n        parseFloat((parseInt(a, 16) / 255).toFixed(2))\n      ];\n    }\n  };\n\n  /**\n   * Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])\n   * @static\n   * @memberOf fabric.Color\n   * @param {Array} source\n   * @return {fabric.Color}\n   */\n  fabric.Color.fromSource = function(source) {\n    var oColor = new Color();\n    oColor.setSource(source);\n    return oColor;\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n  /* _FROM_SVG_START_ */\n  function getColorStop(el) {\n    var style = el.getAttribute('style'),\n        offset = el.getAttribute('offset') || 0,\n        color, colorAlpha, opacity, i;\n\n    // convert percents to absolute values\n    offset = parseFloat(offset) / (/%$/.test(offset) ? 100 : 1);\n    offset = offset < 0 ? 0 : offset > 1 ? 1 : offset;\n    if (style) {\n      var keyValuePairs = style.split(/\\s*;\\s*/);\n\n      if (keyValuePairs[keyValuePairs.length - 1] === '') {\n        keyValuePairs.pop();\n      }\n\n      for (i = keyValuePairs.length; i--; ) {\n\n        var split = keyValuePairs[i].split(/\\s*:\\s*/),\n            key = split[0].trim(),\n            value = split[1].trim();\n\n        if (key === 'stop-color') {\n          color = value;\n        }\n        else if (key === 'stop-opacity') {\n          opacity = value;\n        }\n      }\n    }\n\n    if (!color) {\n      color = el.getAttribute('stop-color') || 'rgb(0,0,0)';\n    }\n    if (!opacity) {\n      opacity = el.getAttribute('stop-opacity');\n    }\n\n    color = new fabric.Color(color);\n    colorAlpha = color.getAlpha();\n    opacity = isNaN(parseFloat(opacity)) ? 1 : parseFloat(opacity);\n    opacity *= colorAlpha;\n\n    return {\n      offset: offset,\n      color: color.toRgb(),\n      opacity: opacity\n    };\n  }\n\n  function getLinearCoords(el) {\n    return {\n      x1: el.getAttribute('x1') || 0,\n      y1: el.getAttribute('y1') || 0,\n      x2: el.getAttribute('x2') || '100%',\n      y2: el.getAttribute('y2') || 0\n    };\n  }\n\n  function getRadialCoords(el) {\n    return {\n      x1: el.getAttribute('fx') || el.getAttribute('cx') || '50%',\n      y1: el.getAttribute('fy') || el.getAttribute('cy') || '50%',\n      r1: 0,\n      x2: el.getAttribute('cx') || '50%',\n      y2: el.getAttribute('cy') || '50%',\n      r2: el.getAttribute('r') || '50%'\n    };\n  }\n  /* _FROM_SVG_END_ */\n\n  var clone = fabric.util.object.clone;\n\n  /**\n   * Gradient class\n   * @class fabric.Gradient\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#gradients}\n   * @see {@link fabric.Gradient#initialize} for constructor definition\n   */\n  fabric.Gradient = fabric.util.createClass(/** @lends fabric.Gradient.prototype */ {\n\n    /**\n     * Horizontal offset for aligning gradients coming from SVG when outside pathgroups\n     * @type Number\n     * @default 0\n     */\n    offsetX: 0,\n\n    /**\n     * Vertical offset for aligning gradients coming from SVG when outside pathgroups\n     * @type Number\n     * @default 0\n     */\n    offsetY: 0,\n\n    /**\n     * Constructor\n     * @param {Object} [options] Options object with type, coords, gradientUnits and colorStops\n     * @return {fabric.Gradient} thisArg\n     */\n    initialize: function(options) {\n      options || (options = { });\n\n      var coords = { };\n\n      this.id = fabric.Object.__uid++;\n      this.type = options.type || 'linear';\n\n      coords = {\n        x1: options.coords.x1 || 0,\n        y1: options.coords.y1 || 0,\n        x2: options.coords.x2 || 0,\n        y2: options.coords.y2 || 0\n      };\n\n      if (this.type === 'radial') {\n        coords.r1 = options.coords.r1 || 0;\n        coords.r2 = options.coords.r2 || 0;\n      }\n      this.coords = coords;\n      this.colorStops = options.colorStops.slice();\n      if (options.gradientTransform) {\n        this.gradientTransform = options.gradientTransform;\n      }\n      this.offsetX = options.offsetX || this.offsetX;\n      this.offsetY = options.offsetY || this.offsetY;\n    },\n\n    /**\n     * Adds another colorStop\n     * @param {Object} colorStop Object with offset and color\n     * @return {fabric.Gradient} thisArg\n     */\n    addColorStop: function(colorStops) {\n      for (var position in colorStops) {\n        var color = new fabric.Color(colorStops[position]);\n        this.colorStops.push({\n          offset: parseFloat(position),\n          color: color.toRgb(),\n          opacity: color.getAlpha()\n        });\n      }\n      return this;\n    },\n\n    /**\n     * Returns object representation of a gradient\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object}\n     */\n    toObject: function(propertiesToInclude) {\n      var object = {\n        type: this.type,\n        coords: this.coords,\n        colorStops: this.colorStops,\n        offsetX: this.offsetX,\n        offsetY: this.offsetY,\n        gradientTransform: this.gradientTransform ? this.gradientTransform.concat() : this.gradientTransform\n      };\n      fabric.util.populateWithProperties(this, object, propertiesToInclude);\n\n      return object;\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns SVG representation of an gradient\n     * @param {Object} object Object to create a gradient for\n     * @return {String} SVG representation of an gradient (linear/radial)\n     */\n    toSVG: function(object, options) {\n      var coords = clone(this.coords, true), i, len, options = options || {},\n          markup, commonAttributes, colorStops = clone(this.colorStops, true),\n          needsSwap = coords.r1 > coords.r2,\n          transform = this.gradientTransform ? this.gradientTransform.concat() : fabric.iMatrix.concat(),\n          offsetX = object.width / 2 - this.offsetX, offsetY = object.height / 2 - this.offsetY,\n          withViewport = !!options.additionalTransform;\n      // colorStops must be sorted ascending\n      colorStops.sort(function(a, b) {\n        return a.offset - b.offset;\n      });\n\n      if (object.type === 'path') {\n        offsetX -= object.pathOffset.x;\n        offsetY -= object.pathOffset.y;\n      }\n\n      transform[4] -= offsetX;\n      transform[5] -= offsetY;\n\n      commonAttributes = 'id=\"SVGID_' + this.id +\n                     '\" gradientUnits=\"userSpaceOnUse\"';\n      commonAttributes += ' gradientTransform=\"' + (withViewport ?\n        options.additionalTransform + ' ' : '') + fabric.util.matrixToSVG(transform) + '\" ';\n\n      if (this.type === 'linear') {\n        markup = [\n          '<linearGradient ',\n          commonAttributes,\n          ' x1=\"', coords.x1,\n          '\" y1=\"', coords.y1,\n          '\" x2=\"', coords.x2,\n          '\" y2=\"', coords.y2,\n          '\">\\n'\n        ];\n      }\n      else if (this.type === 'radial') {\n        // svg radial gradient has just 1 radius. the biggest.\n        markup = [\n          '<radialGradient ',\n          commonAttributes,\n          ' cx=\"', needsSwap ? coords.x1 : coords.x2,\n          '\" cy=\"', needsSwap ? coords.y1 : coords.y2,\n          '\" r=\"', needsSwap ? coords.r1 : coords.r2,\n          '\" fx=\"', needsSwap ? coords.x2 : coords.x1,\n          '\" fy=\"', needsSwap ? coords.y2 : coords.y1,\n          '\">\\n'\n        ];\n      }\n\n      if (this.type === 'radial') {\n        if (needsSwap) {\n          // svg goes from internal to external radius. if radius are inverted, swap color stops.\n          colorStops = colorStops.concat();\n          colorStops.reverse();\n          for (i = 0, len = colorStops.length; i < len; i++) {\n            colorStops[i].offset = 1 - colorStops[i].offset;\n          }\n        }\n        var minRadius = Math.min(coords.r1, coords.r2);\n        if (minRadius > 0) {\n          // i have to shift all colorStops and add new one in 0.\n          var maxRadius = Math.max(coords.r1, coords.r2),\n              percentageShift = minRadius / maxRadius;\n          for (i = 0, len = colorStops.length; i < len; i++) {\n            colorStops[i].offset += percentageShift * (1 - colorStops[i].offset);\n          }\n        }\n      }\n\n      for (i = 0, len = colorStops.length; i < len; i++) {\n        var colorStop = colorStops[i];\n        markup.push(\n          '<stop ',\n          'offset=\"', (colorStop.offset * 100) + '%',\n          '\" style=\"stop-color:', colorStop.color,\n          (typeof colorStop.opacity !== 'undefined' ? ';stop-opacity: ' + colorStop.opacity : ';'),\n          '\"/>\\n'\n        );\n      }\n\n      markup.push((this.type === 'linear' ? '</linearGradient>\\n' : '</radialGradient>\\n'));\n\n      return markup.join('');\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * Returns an instance of CanvasGradient\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     * @return {CanvasGradient}\n     */\n    toLive: function(ctx) {\n      var gradient, coords = fabric.util.object.clone(this.coords), i, len;\n\n      if (!this.type) {\n        return;\n      }\n\n      if (this.type === 'linear') {\n        gradient = ctx.createLinearGradient(\n          coords.x1, coords.y1, coords.x2, coords.y2);\n      }\n      else if (this.type === 'radial') {\n        gradient = ctx.createRadialGradient(\n          coords.x1, coords.y1, coords.r1, coords.x2, coords.y2, coords.r2);\n      }\n\n      for (i = 0, len = this.colorStops.length; i < len; i++) {\n        var color = this.colorStops[i].color,\n            opacity = this.colorStops[i].opacity,\n            offset = this.colorStops[i].offset;\n\n        if (typeof opacity !== 'undefined') {\n          color = new fabric.Color(color).setAlpha(opacity).toRgba();\n        }\n        gradient.addColorStop(offset, color);\n      }\n\n      return gradient;\n    }\n  });\n\n  fabric.util.object.extend(fabric.Gradient, {\n\n    /* _FROM_SVG_START_ */\n    /**\n     * Returns {@link fabric.Gradient} instance from an SVG element\n     * @static\n     * @memberOf fabric.Gradient\n     * @param {SVGGradientElement} el SVG gradient element\n     * @param {fabric.Object} instance\n     * @return {fabric.Gradient} Gradient instance\n     * @see http://www.w3.org/TR/SVG/pservers.html#LinearGradientElement\n     * @see http://www.w3.org/TR/SVG/pservers.html#RadialGradientElement\n     */\n    fromElement: function(el, instance) {\n      /**\n       *  @example:\n       *\n       *  <linearGradient id=\"linearGrad1\">\n       *    <stop offset=\"0%\" stop-color=\"white\"/>\n       *    <stop offset=\"100%\" stop-color=\"black\"/>\n       *  </linearGradient>\n       *\n       *  OR\n       *\n       *  <linearGradient id=\"linearGrad2\">\n       *    <stop offset=\"0\" style=\"stop-color:rgb(255,255,255)\"/>\n       *    <stop offset=\"1\" style=\"stop-color:rgb(0,0,0)\"/>\n       *  </linearGradient>\n       *\n       *  OR\n       *\n       *  <radialGradient id=\"radialGrad1\">\n       *    <stop offset=\"0%\" stop-color=\"white\" stop-opacity=\"1\" />\n       *    <stop offset=\"50%\" stop-color=\"black\" stop-opacity=\"0.5\" />\n       *    <stop offset=\"100%\" stop-color=\"white\" stop-opacity=\"1\" />\n       *  </radialGradient>\n       *\n       *  OR\n       *\n       *  <radialGradient id=\"radialGrad2\">\n       *    <stop offset=\"0\" stop-color=\"rgb(255,255,255)\" />\n       *    <stop offset=\"0.5\" stop-color=\"rgb(0,0,0)\" />\n       *    <stop offset=\"1\" stop-color=\"rgb(255,255,255)\" />\n       *  </radialGradient>\n       *\n       */\n\n      var colorStopEls = el.getElementsByTagName('stop'),\n          type,\n          gradientUnits = el.getAttribute('gradientUnits') || 'objectBoundingBox',\n          gradientTransform = el.getAttribute('gradientTransform'),\n          colorStops = [],\n          coords, ellipseMatrix, i;\n\n      if (el.nodeName === 'linearGradient' || el.nodeName === 'LINEARGRADIENT') {\n        type = 'linear';\n      }\n      else {\n        type = 'radial';\n      }\n\n      if (type === 'linear') {\n        coords = getLinearCoords(el);\n      }\n      else if (type === 'radial') {\n        coords = getRadialCoords(el);\n      }\n\n      for (i = colorStopEls.length; i--; ) {\n        colorStops.push(getColorStop(colorStopEls[i]));\n      }\n\n      ellipseMatrix = _convertPercentUnitsToValues(instance, coords, gradientUnits);\n\n      var gradient = new fabric.Gradient({\n        type: type,\n        coords: coords,\n        colorStops: colorStops,\n        offsetX: -instance.left,\n        offsetY: -instance.top\n      });\n\n      if (gradientTransform || ellipseMatrix !== '') {\n        gradient.gradientTransform = fabric.parseTransformAttribute((gradientTransform || '') + ellipseMatrix);\n      }\n\n      return gradient;\n    },\n    /* _FROM_SVG_END_ */\n\n    /**\n     * Returns {@link fabric.Gradient} instance from its object representation\n     * @static\n     * @memberOf fabric.Gradient\n     * @param {Object} obj\n     * @param {Object} [options] Options object\n     */\n    forObject: function(obj, options) {\n      options || (options = { });\n      _convertPercentUnitsToValues(obj, options.coords, 'userSpaceOnUse');\n      return new fabric.Gradient(options);\n    }\n  });\n\n  /**\n   * @private\n   */\n  function _convertPercentUnitsToValues(object, options, gradientUnits) {\n    var propValue, addFactor = 0, multFactor = 1, ellipseMatrix = '';\n    for (var prop in options) {\n      if (options[prop] === 'Infinity') {\n        options[prop] = 1;\n      }\n      else if (options[prop] === '-Infinity') {\n        options[prop] = 0;\n      }\n      propValue = parseFloat(options[prop], 10);\n      if (typeof options[prop] === 'string' && /^(\\d+\\.\\d+)%|(\\d+)%$/.test(options[prop])) {\n        multFactor = 0.01;\n      }\n      else {\n        multFactor = 1;\n      }\n      if (prop === 'x1' || prop === 'x2' || prop === 'r2') {\n        multFactor *= gradientUnits === 'objectBoundingBox' ? object.width : 1;\n        addFactor = gradientUnits === 'objectBoundingBox' ? object.left || 0 : 0;\n      }\n      else if (prop === 'y1' || prop === 'y2') {\n        multFactor *= gradientUnits === 'objectBoundingBox' ? object.height : 1;\n        addFactor = gradientUnits === 'objectBoundingBox' ? object.top || 0 : 0;\n      }\n      options[prop] = propValue * multFactor + addFactor;\n    }\n    if (object.type === 'ellipse' &&\n        options.r2 !== null &&\n        gradientUnits === 'objectBoundingBox' &&\n        object.rx !== object.ry) {\n\n      var scaleFactor = object.ry / object.rx;\n      ellipseMatrix = ' scale(1, ' + scaleFactor + ')';\n      if (options.y1) {\n        options.y1 /= scaleFactor;\n      }\n      if (options.y2) {\n        options.y2 /= scaleFactor;\n      }\n    }\n    return ellipseMatrix;\n  }\n})();\n\n\n(function() {\n\n  'use strict';\n\n  var toFixed = fabric.util.toFixed;\n\n  /**\n   * Pattern class\n   * @class fabric.Pattern\n   * @see {@link http://fabricjs.com/patterns|Pattern demo}\n   * @see {@link http://fabricjs.com/dynamic-patterns|DynamicPattern demo}\n   * @see {@link fabric.Pattern#initialize} for constructor definition\n   */\n\n\n  fabric.Pattern = fabric.util.createClass(/** @lends fabric.Pattern.prototype */ {\n\n    /**\n     * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)\n     * @type String\n     * @default\n     */\n    repeat: 'repeat',\n\n    /**\n     * Pattern horizontal offset from object's left/top corner\n     * @type Number\n     * @default\n     */\n    offsetX: 0,\n\n    /**\n     * Pattern vertical offset from object's left/top corner\n     * @type Number\n     * @default\n     */\n    offsetY: 0,\n\n    /**\n     * crossOrigin value (one of \"\", \"anonymous\", \"use-credentials\")\n     * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes\n     * @type String\n     * @default\n     */\n    crossOrigin: '',\n\n    /**\n     * transform matrix to change the pattern, imported from svgs.\n     * @type Array\n     * @default\n     */\n    patternTransform: null,\n\n    /**\n     * Constructor\n     * @param {Object} [options] Options object\n     * @param {Function} [callback] function to invoke after callback init.\n     * @return {fabric.Pattern} thisArg\n     */\n    initialize: function(options, callback) {\n      options || (options = { });\n\n      this.id = fabric.Object.__uid++;\n      this.setOptions(options);\n      if (!options.source || (options.source && typeof options.source !== 'string')) {\n        callback && callback(this);\n        return;\n      }\n      // function string\n      if (typeof fabric.util.getFunctionBody(options.source) !== 'undefined') {\n        this.source = new Function(fabric.util.getFunctionBody(options.source));\n        callback && callback(this);\n      }\n      else {\n        // img src string\n        var _this = this;\n        this.source = fabric.util.createImage();\n        fabric.util.loadImage(options.source, function(img) {\n          _this.source = img;\n          callback && callback(_this);\n        }, null, this.crossOrigin);\n      }\n    },\n\n    /**\n     * Returns object representation of a pattern\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} Object representation of a pattern instance\n     */\n    toObject: function(propertiesToInclude) {\n      var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n          source, object;\n\n      // callback\n      if (typeof this.source === 'function') {\n        source = String(this.source);\n      }\n      // <img> element\n      else if (typeof this.source.src === 'string') {\n        source = this.source.src;\n      }\n      // <canvas> element\n      else if (typeof this.source === 'object' && this.source.toDataURL) {\n        source = this.source.toDataURL();\n      }\n\n      object = {\n        type: 'pattern',\n        source: source,\n        repeat: this.repeat,\n        crossOrigin: this.crossOrigin,\n        offsetX: toFixed(this.offsetX, NUM_FRACTION_DIGITS),\n        offsetY: toFixed(this.offsetY, NUM_FRACTION_DIGITS),\n        patternTransform: this.patternTransform ? this.patternTransform.concat() : null\n      };\n      fabric.util.populateWithProperties(this, object, propertiesToInclude);\n\n      return object;\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns SVG representation of a pattern\n     * @param {fabric.Object} object\n     * @return {String} SVG representation of a pattern\n     */\n    toSVG: function(object) {\n      var patternSource = typeof this.source === 'function' ? this.source() : this.source,\n          patternWidth = patternSource.width / object.width,\n          patternHeight = patternSource.height / object.height,\n          patternOffsetX = this.offsetX / object.width,\n          patternOffsetY = this.offsetY / object.height,\n          patternImgSrc = '';\n      if (this.repeat === 'repeat-x' || this.repeat === 'no-repeat') {\n        patternHeight = 1;\n        if (patternOffsetY) {\n          patternHeight += Math.abs(patternOffsetY);\n        }\n      }\n      if (this.repeat === 'repeat-y' || this.repeat === 'no-repeat') {\n        patternWidth = 1;\n        if (patternOffsetX) {\n          patternWidth += Math.abs(patternOffsetX);\n        }\n\n      }\n      if (patternSource.src) {\n        patternImgSrc = patternSource.src;\n      }\n      else if (patternSource.toDataURL) {\n        patternImgSrc = patternSource.toDataURL();\n      }\n\n      return '<pattern id=\"SVGID_' + this.id +\n                    '\" x=\"' + patternOffsetX +\n                    '\" y=\"' + patternOffsetY +\n                    '\" width=\"' + patternWidth +\n                    '\" height=\"' + patternHeight + '\">\\n' +\n               '<image x=\"0\" y=\"0\"' +\n                      ' width=\"' + patternSource.width +\n                      '\" height=\"' + patternSource.height +\n                      '\" xlink:href=\"' + patternImgSrc +\n               '\"></image>\\n' +\n             '</pattern>\\n';\n    },\n    /* _TO_SVG_END_ */\n\n    setOptions: function(options) {\n      for (var prop in options) {\n        this[prop] = options[prop];\n      }\n    },\n\n    /**\n     * Returns an instance of CanvasPattern\n     * @param {CanvasRenderingContext2D} ctx Context to create pattern\n     * @return {CanvasPattern}\n     */\n    toLive: function(ctx) {\n      var source = typeof this.source === 'function' ? this.source() : this.source;\n\n      // if the image failed to load, return, and allow rest to continue loading\n      if (!source) {\n        return '';\n      }\n\n      // if an image\n      if (typeof source.src !== 'undefined') {\n        if (!source.complete) {\n          return '';\n        }\n        if (source.naturalWidth === 0 || source.naturalHeight === 0) {\n          return '';\n        }\n      }\n      return ctx.createPattern(source, this.repeat);\n    }\n  });\n})();\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      toFixed = fabric.util.toFixed;\n\n  if (fabric.Shadow) {\n    fabric.warn('fabric.Shadow is already defined.');\n    return;\n  }\n\n  /**\n   * Shadow class\n   * @class fabric.Shadow\n   * @see {@link http://fabricjs.com/shadows|Shadow demo}\n   * @see {@link fabric.Shadow#initialize} for constructor definition\n   */\n  fabric.Shadow = fabric.util.createClass(/** @lends fabric.Shadow.prototype */ {\n\n    /**\n     * Shadow color\n     * @type String\n     * @default\n     */\n    color: 'rgb(0,0,0)',\n\n    /**\n     * Shadow blur\n     * @type Number\n     */\n    blur: 0,\n\n    /**\n     * Shadow horizontal offset\n     * @type Number\n     * @default\n     */\n    offsetX: 0,\n\n    /**\n     * Shadow vertical offset\n     * @type Number\n     * @default\n     */\n    offsetY: 0,\n\n    /**\n     * Whether the shadow should affect stroke operations\n     * @type Boolean\n     * @default\n     */\n    affectStroke: false,\n\n    /**\n     * Indicates whether toObject should include default values\n     * @type Boolean\n     * @default\n     */\n    includeDefaultValues: true,\n\n    /**\n     * When `false`, the shadow will scale with the object.\n     * When `true`, the shadow's offsetX, offsetY, and blur will not be affected by the object's scale.\n     * default to false\n     * @type Boolean\n     * @default\n     */\n    nonScaling: false,\n\n    /**\n     * Constructor\n     * @param {Object|String} [options] Options object with any of color, blur, offsetX, offsetY properties or string (e.g. \"rgba(0,0,0,0.2) 2px 2px 10px\")\n     * @return {fabric.Shadow} thisArg\n     */\n    initialize: function(options) {\n\n      if (typeof options === 'string') {\n        options = this._parseShadow(options);\n      }\n\n      for (var prop in options) {\n        this[prop] = options[prop];\n      }\n\n      this.id = fabric.Object.__uid++;\n    },\n\n    /**\n     * @private\n     * @param {String} shadow Shadow value to parse\n     * @return {Object} Shadow object with color, offsetX, offsetY and blur\n     */\n    _parseShadow: function(shadow) {\n      var shadowStr = shadow.trim(),\n          offsetsAndBlur = fabric.Shadow.reOffsetsAndBlur.exec(shadowStr) || [],\n          color = shadowStr.replace(fabric.Shadow.reOffsetsAndBlur, '') || 'rgb(0,0,0)';\n\n      return {\n        color: color.trim(),\n        offsetX: parseInt(offsetsAndBlur[1], 10) || 0,\n        offsetY: parseInt(offsetsAndBlur[2], 10) || 0,\n        blur: parseInt(offsetsAndBlur[3], 10) || 0\n      };\n    },\n\n    /**\n     * Returns a string representation of an instance\n     * @see http://www.w3.org/TR/css-text-decor-3/#text-shadow\n     * @return {String} Returns CSS3 text-shadow declaration\n     */\n    toString: function() {\n      return [this.offsetX, this.offsetY, this.blur, this.color].join('px ');\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns SVG representation of a shadow\n     * @param {fabric.Object} object\n     * @return {String} SVG representation of a shadow\n     */\n    toSVG: function(object) {\n      var fBoxX = 40, fBoxY = 40, NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n          offset = fabric.util.rotateVector(\n            { x: this.offsetX, y: this.offsetY },\n            fabric.util.degreesToRadians(-object.angle)),\n          BLUR_BOX = 20, color = new fabric.Color(this.color);\n\n      if (object.width && object.height) {\n        //http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion\n        // we add some extra space to filter box to contain the blur ( 20 )\n        fBoxX = toFixed((Math.abs(offset.x) + this.blur) / object.width, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n        fBoxY = toFixed((Math.abs(offset.y) + this.blur) / object.height, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n      }\n      if (object.flipX) {\n        offset.x *= -1;\n      }\n      if (object.flipY) {\n        offset.y *= -1;\n      }\n\n      return (\n        '<filter id=\"SVGID_' + this.id + '\" y=\"-' + fBoxY + '%\" height=\"' + (100 + 2 * fBoxY) + '%\" ' +\n          'x=\"-' + fBoxX + '%\" width=\"' + (100 + 2 * fBoxX) + '%\" ' + '>\\n' +\n          '\\t<feGaussianBlur in=\"SourceAlpha\" stdDeviation=\"' +\n            toFixed(this.blur ? this.blur / 2 : 0, NUM_FRACTION_DIGITS) + '\"></feGaussianBlur>\\n' +\n          '\\t<feOffset dx=\"' + toFixed(offset.x, NUM_FRACTION_DIGITS) +\n          '\" dy=\"' + toFixed(offset.y, NUM_FRACTION_DIGITS) + '\" result=\"oBlur\" ></feOffset>\\n' +\n          '\\t<feFlood flood-color=\"' + color.toRgb() + '\" flood-opacity=\"' + color.getAlpha() + '\"/>\\n' +\n          '\\t<feComposite in2=\"oBlur\" operator=\"in\" />\\n' +\n          '\\t<feMerge>\\n' +\n            '\\t\\t<feMergeNode></feMergeNode>\\n' +\n            '\\t\\t<feMergeNode in=\"SourceGraphic\"></feMergeNode>\\n' +\n          '\\t</feMerge>\\n' +\n        '</filter>\\n');\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * Returns object representation of a shadow\n     * @return {Object} Object representation of a shadow instance\n     */\n    toObject: function() {\n      if (this.includeDefaultValues) {\n        return {\n          color: this.color,\n          blur: this.blur,\n          offsetX: this.offsetX,\n          offsetY: this.offsetY,\n          affectStroke: this.affectStroke,\n          nonScaling: this.nonScaling\n        };\n      }\n      var obj = { }, proto = fabric.Shadow.prototype;\n\n      ['color', 'blur', 'offsetX', 'offsetY', 'affectStroke', 'nonScaling'].forEach(function(prop) {\n        if (this[prop] !== proto[prop]) {\n          obj[prop] = this[prop];\n        }\n      }, this);\n\n      return obj;\n    }\n  });\n\n  /**\n   * Regex matching shadow offsetX, offsetY and blur (ex: \"2px 2px 10px rgba(0,0,0,0.2)\", \"rgb(0,255,0) 2px 2px\")\n   * @static\n   * @field\n   * @memberOf fabric.Shadow\n   */\n  // eslint-disable-next-line max-len\n  fabric.Shadow.reOffsetsAndBlur = /(?:\\s|^)(-?\\d+(?:px)?(?:\\s?|$))?(-?\\d+(?:px)?(?:\\s?|$))?(\\d+(?:px)?)?(?:\\s?|$)(?:$|\\s)/;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function () {\n\n  'use strict';\n\n  if (fabric.StaticCanvas) {\n    fabric.warn('fabric.StaticCanvas is already defined.');\n    return;\n  }\n\n  // aliases for faster resolution\n  var extend = fabric.util.object.extend,\n      getElementOffset = fabric.util.getElementOffset,\n      removeFromArray = fabric.util.removeFromArray,\n      toFixed = fabric.util.toFixed,\n      transformPoint = fabric.util.transformPoint,\n      invertTransform = fabric.util.invertTransform,\n      getNodeCanvas = fabric.util.getNodeCanvas,\n      createCanvasElement = fabric.util.createCanvasElement,\n\n      CANVAS_INIT_ERROR = new Error('Could not initialize `canvas` element');\n\n  /**\n   * Static canvas class\n   * @class fabric.StaticCanvas\n   * @mixes fabric.Collection\n   * @mixes fabric.Observable\n   * @see {@link http://fabricjs.com/static_canvas|StaticCanvas demo}\n   * @see {@link fabric.StaticCanvas#initialize} for constructor definition\n   * @fires before:render\n   * @fires after:render\n   * @fires canvas:cleared\n   * @fires object:added\n   * @fires object:removed\n   */\n  fabric.StaticCanvas = fabric.util.createClass(fabric.CommonMethods, /** @lends fabric.StaticCanvas.prototype */ {\n\n    /**\n     * Constructor\n     * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on\n     * @param {Object} [options] Options object\n     * @return {Object} thisArg\n     */\n    initialize: function(el, options) {\n      options || (options = { });\n      this.renderAndResetBound = this.renderAndReset.bind(this);\n      this.requestRenderAllBound = this.requestRenderAll.bind(this);\n      this._initStatic(el, options);\n    },\n\n    /**\n     * Background color of canvas instance.\n     * Should be set via {@link fabric.StaticCanvas#setBackgroundColor}.\n     * @type {(String|fabric.Pattern)}\n     * @default\n     */\n    backgroundColor: '',\n\n    /**\n     * Background image of canvas instance.\n     * Should be set via {@link fabric.StaticCanvas#setBackgroundImage}.\n     * <b>Backwards incompatibility note:</b> The \"backgroundImageOpacity\"\n     * and \"backgroundImageStretch\" properties are deprecated since 1.3.9.\n     * Use {@link fabric.Image#opacity}, {@link fabric.Image#width} and {@link fabric.Image#height}.\n     * since 2.4.0 image caching is active, please when putting an image as background, add to the\n     * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n     * vale. As an alternative you can disable image objectCaching\n     * @type fabric.Image\n     * @default\n     */\n    backgroundImage: null,\n\n    /**\n     * Overlay color of canvas instance.\n     * Should be set via {@link fabric.StaticCanvas#setOverlayColor}\n     * @since 1.3.9\n     * @type {(String|fabric.Pattern)}\n     * @default\n     */\n    overlayColor: '',\n\n    /**\n     * Overlay image of canvas instance.\n     * Should be set via {@link fabric.StaticCanvas#setOverlayImage}.\n     * <b>Backwards incompatibility note:</b> The \"overlayImageLeft\"\n     * and \"overlayImageTop\" properties are deprecated since 1.3.9.\n     * Use {@link fabric.Image#left} and {@link fabric.Image#top}.\n     * since 2.4.0 image caching is active, please when putting an image as overlay, add to the\n     * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n     * vale. As an alternative you can disable image objectCaching\n     * @type fabric.Image\n     * @default\n     */\n    overlayImage: null,\n\n    /**\n     * Indicates whether toObject/toDatalessObject should include default values\n     * if set to false, takes precedence over the object value.\n     * @type Boolean\n     * @default\n     */\n    includeDefaultValues: true,\n\n    /**\n     * Indicates whether objects' state should be saved\n     * @type Boolean\n     * @default\n     */\n    stateful: false,\n\n    /**\n     * Indicates whether {@link fabric.Collection.add}, {@link fabric.Collection.insertAt} and {@link fabric.Collection.remove},\n     * {@link fabric.StaticCanvas.moveTo}, {@link fabric.StaticCanvas.clear} and many more, should also re-render canvas.\n     * Disabling this option will not give a performance boost when adding/removing a lot of objects to/from canvas at once\n     * since the renders are quequed and executed one per frame.\n     * Disabling is suggested anyway and managing the renders of the app manually is not a big effort ( canvas.requestRenderAll() )\n     * Left default to true to do not break documentation and old app, fiddles.\n     * @type Boolean\n     * @default\n     */\n    renderOnAddRemove: true,\n\n    /**\n     * Function that determines clipping of entire canvas area\n     * Being passed context as first argument.\n     * If you are using code minification, ctx argument can be minified/manglied you should use\n     * as a workaround `var ctx = arguments[0];` in the function;\n     * See clipping canvas area in {@link https://github.com/kangax/fabric.js/wiki/FAQ}\n     * @deprecated since 2.0.0\n     * @type Function\n     * @default\n     */\n    clipTo: null,\n\n    /**\n     * Indicates whether object controls (borders/controls) are rendered above overlay image\n     * @type Boolean\n     * @default\n     */\n    controlsAboveOverlay: false,\n\n    /**\n     * Indicates whether the browser can be scrolled when using a touchscreen and dragging on the canvas\n     * @type Boolean\n     * @default\n     */\n    allowTouchScrolling: false,\n\n    /**\n     * Indicates whether this canvas will use image smoothing, this is on by default in browsers\n     * @type Boolean\n     * @default\n     */\n    imageSmoothingEnabled: true,\n\n    /**\n     * The transformation (in the format of Canvas transform) which focuses the viewport\n     * @type Array\n     * @default\n     */\n    viewportTransform: fabric.iMatrix.concat(),\n\n    /**\n     * if set to false background image is not affected by viewport transform\n     * @since 1.6.3\n     * @type Boolean\n     * @default\n     */\n    backgroundVpt: true,\n\n    /**\n     * if set to false overlya image is not affected by viewport transform\n     * @since 1.6.3\n     * @type Boolean\n     * @default\n     */\n    overlayVpt: true,\n\n    /**\n     * Callback; invoked right before object is about to be scaled/rotated\n     * @deprecated since 2.3.0\n     * Use before:transform event\n     */\n    onBeforeScaleRotate: function () {\n      /* NOOP */\n    },\n\n    /**\n     * When true, canvas is scaled by devicePixelRatio for better rendering on retina screens\n     * @type Boolean\n     * @default\n     */\n    enableRetinaScaling: true,\n\n    /**\n     * Describe canvas element extension over design\n     * properties are tl,tr,bl,br.\n     * if canvas is not zoomed/panned those points are the four corner of canvas\n     * if canvas is viewportTransformed you those points indicate the extension\n     * of canvas element in plain untrasformed coordinates\n     * The coordinates get updated with @method calcViewportBoundaries.\n     * @memberOf fabric.StaticCanvas.prototype\n     */\n    vptCoords: { },\n\n    /**\n     * Based on vptCoords and object.aCoords, skip rendering of objects that\n     * are not included in current viewport.\n     * May greatly help in applications with crowded canvas and use of zoom/pan\n     * If One of the corner of the bounding box of the object is on the canvas\n     * the objects get rendered.\n     * @memberOf fabric.StaticCanvas.prototype\n     * @type Boolean\n     * @default\n     */\n    skipOffscreen: true,\n\n    /**\n     * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n     * the clipPath object gets used when the canvas has rendered, and the context is placed in the\n     * top left corner of the canvas.\n     * clipPath will clip away controls, if you do not want this to happen use controlsAboveOverlay = true\n     * @type fabric.Object\n     */\n    clipPath: undefined,\n\n    /**\n     * @private\n     * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on\n     * @param {Object} [options] Options object\n     */\n    _initStatic: function(el, options) {\n      var cb = this.requestRenderAllBound;\n      this._objects = [];\n      this._createLowerCanvas(el);\n      this._initOptions(options);\n      this._setImageSmoothing();\n      // only initialize retina scaling once\n      if (!this.interactive) {\n        this._initRetinaScaling();\n      }\n\n      if (options.overlayImage) {\n        this.setOverlayImage(options.overlayImage, cb);\n      }\n      if (options.backgroundImage) {\n        this.setBackgroundImage(options.backgroundImage, cb);\n      }\n      if (options.backgroundColor) {\n        this.setBackgroundColor(options.backgroundColor, cb);\n      }\n      if (options.overlayColor) {\n        this.setOverlayColor(options.overlayColor, cb);\n      }\n      this.calcOffset();\n    },\n\n    /**\n     * @private\n     */\n    _isRetinaScaling: function() {\n      return (fabric.devicePixelRatio !== 1 && this.enableRetinaScaling);\n    },\n\n    /**\n     * @private\n     * @return {Number} retinaScaling if applied, otherwise 1;\n     */\n    getRetinaScaling: function() {\n      return this._isRetinaScaling() ? fabric.devicePixelRatio : 1;\n    },\n\n    /**\n     * @private\n     */\n    _initRetinaScaling: function() {\n      if (!this._isRetinaScaling()) {\n        return;\n      }\n      this.lowerCanvasEl.setAttribute('width', this.width * fabric.devicePixelRatio);\n      this.lowerCanvasEl.setAttribute('height', this.height * fabric.devicePixelRatio);\n\n      this.contextContainer.scale(fabric.devicePixelRatio, fabric.devicePixelRatio);\n    },\n\n    /**\n     * Calculates canvas element offset relative to the document\n     * This method is also attached as \"resize\" event handler of window\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    calcOffset: function () {\n      this._offset = getElementOffset(this.lowerCanvasEl);\n      return this;\n    },\n\n    /**\n     * Sets {@link fabric.StaticCanvas#overlayImage|overlay image} for this canvas\n     * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set overlay to\n     * @param {Function} callback callback to invoke when image is loaded and set as an overlay\n     * @param {Object} [options] Optional options to set for the {@link fabric.Image|overlay image}.\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/MnzHT/|jsFiddle demo}\n     * @example <caption>Normal overlayImage with left/top = 0</caption>\n     * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n     *   // Needed to position overlayImage at 0/0\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>overlayImage with different properties</caption>\n     * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n     *   opacity: 0.5,\n     *   angle: 45,\n     *   left: 400,\n     *   top: 400,\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>Stretched overlayImage #1 - width/height correspond to canvas width/height</caption>\n     * fabric.Image.fromURL('http://fabricjs.com/assets/jail_cell_bars.png', function(img) {\n     *    img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n     *    canvas.setOverlayImage(img, canvas.renderAll.bind(canvas));\n     * });\n     * @example <caption>Stretched overlayImage #2 - width/height correspond to canvas width/height</caption>\n     * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n     *   width: canvas.width,\n     *   height: canvas.height,\n     *   // Needed to position overlayImage at 0/0\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>overlayImage loaded from cross-origin</caption>\n     * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n     *   opacity: 0.5,\n     *   angle: 45,\n     *   left: 400,\n     *   top: 400,\n     *   originX: 'left',\n     *   originY: 'top',\n     *   crossOrigin: 'anonymous'\n     * });\n     */\n    setOverlayImage: function (image, callback, options) {\n      return this.__setBgOverlayImage('overlayImage', image, callback, options);\n    },\n\n    /**\n     * Sets {@link fabric.StaticCanvas#backgroundImage|background image} for this canvas\n     * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set background to\n     * @param {Function} callback Callback to invoke when image is loaded and set as background\n     * @param {Object} [options] Optional options to set for the {@link fabric.Image|background image}.\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/djnr8o7a/28/|jsFiddle demo}\n     * @example <caption>Normal backgroundImage with left/top = 0</caption>\n     * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n     *   // Needed to position backgroundImage at 0/0\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>backgroundImage with different properties</caption>\n     * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n     *   opacity: 0.5,\n     *   angle: 45,\n     *   left: 400,\n     *   top: 400,\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>Stretched backgroundImage #1 - width/height correspond to canvas width/height</caption>\n     * fabric.Image.fromURL('http://fabricjs.com/assets/honey_im_subtle.png', function(img) {\n     *    img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n     *    canvas.setBackgroundImage(img, canvas.renderAll.bind(canvas));\n     * });\n     * @example <caption>Stretched backgroundImage #2 - width/height correspond to canvas width/height</caption>\n     * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n     *   width: canvas.width,\n     *   height: canvas.height,\n     *   // Needed to position backgroundImage at 0/0\n     *   originX: 'left',\n     *   originY: 'top'\n     * });\n     * @example <caption>backgroundImage loaded from cross-origin</caption>\n     * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n     *   opacity: 0.5,\n     *   angle: 45,\n     *   left: 400,\n     *   top: 400,\n     *   originX: 'left',\n     *   originY: 'top',\n     *   crossOrigin: 'anonymous'\n     * });\n     */\n    // TODO: fix stretched examples\n    setBackgroundImage: function (image, callback, options) {\n      return this.__setBgOverlayImage('backgroundImage', image, callback, options);\n    },\n\n    /**\n     * Sets {@link fabric.StaticCanvas#overlayColor|foreground color} for this canvas\n     * @param {(String|fabric.Pattern)} overlayColor Color or pattern to set foreground color to\n     * @param {Function} callback Callback to invoke when foreground color is set\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/pB55h/|jsFiddle demo}\n     * @example <caption>Normal overlayColor - color value</caption>\n     * canvas.setOverlayColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n     * @example <caption>fabric.Pattern used as overlayColor</caption>\n     * canvas.setOverlayColor({\n     *   source: 'http://fabricjs.com/assets/escheresque_ste.png'\n     * }, canvas.renderAll.bind(canvas));\n     * @example <caption>fabric.Pattern used as overlayColor with repeat and offset</caption>\n     * canvas.setOverlayColor({\n     *   source: 'http://fabricjs.com/assets/escheresque_ste.png',\n     *   repeat: 'repeat',\n     *   offsetX: 200,\n     *   offsetY: 100\n     * }, canvas.renderAll.bind(canvas));\n     */\n    setOverlayColor: function(overlayColor, callback) {\n      return this.__setBgOverlayColor('overlayColor', overlayColor, callback);\n    },\n\n    /**\n     * Sets {@link fabric.StaticCanvas#backgroundColor|background color} for this canvas\n     * @param {(String|fabric.Pattern)} backgroundColor Color or pattern to set background color to\n     * @param {Function} callback Callback to invoke when background color is set\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/hXzvk/|jsFiddle demo}\n     * @example <caption>Normal backgroundColor - color value</caption>\n     * canvas.setBackgroundColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n     * @example <caption>fabric.Pattern used as backgroundColor</caption>\n     * canvas.setBackgroundColor({\n     *   source: 'http://fabricjs.com/assets/escheresque_ste.png'\n     * }, canvas.renderAll.bind(canvas));\n     * @example <caption>fabric.Pattern used as backgroundColor with repeat and offset</caption>\n     * canvas.setBackgroundColor({\n     *   source: 'http://fabricjs.com/assets/escheresque_ste.png',\n     *   repeat: 'repeat',\n     *   offsetX: 200,\n     *   offsetY: 100\n     * }, canvas.renderAll.bind(canvas));\n     */\n    setBackgroundColor: function(backgroundColor, callback) {\n      return this.__setBgOverlayColor('backgroundColor', backgroundColor, callback);\n    },\n\n    /**\n     * @private\n     * @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-imagesmoothingenabled|WhatWG Canvas Standard}\n     */\n    _setImageSmoothing: function() {\n      var ctx = this.getContext();\n\n      ctx.imageSmoothingEnabled = ctx.imageSmoothingEnabled || ctx.webkitImageSmoothingEnabled\n        || ctx.mozImageSmoothingEnabled || ctx.msImageSmoothingEnabled || ctx.oImageSmoothingEnabled;\n      ctx.imageSmoothingEnabled = this.imageSmoothingEnabled;\n    },\n\n    /**\n     * @private\n     * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundImage|backgroundImage}\n     * or {@link fabric.StaticCanvas#overlayImage|overlayImage})\n     * @param {(fabric.Image|String|null)} image fabric.Image instance, URL of an image or null to set background or overlay to\n     * @param {Function} callback Callback to invoke when image is loaded and set as background or overlay\n     * @param {Object} [options] Optional options to set for the {@link fabric.Image|image}.\n     */\n    __setBgOverlayImage: function(property, image, callback, options) {\n      if (typeof image === 'string') {\n        fabric.util.loadImage(image, function(img) {\n          if (img) {\n            var instance = new fabric.Image(img, options);\n            this[property] = instance;\n            instance.canvas = this;\n          }\n          callback && callback(img);\n        }, this, options && options.crossOrigin);\n      }\n      else {\n        options && image.setOptions(options);\n        this[property] = image;\n        image && (image.canvas = this);\n        callback && callback(image);\n      }\n\n      return this;\n    },\n\n    /**\n     * @private\n     * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundColor|backgroundColor}\n     * or {@link fabric.StaticCanvas#overlayColor|overlayColor})\n     * @param {(Object|String|null)} color Object with pattern information, color value or null\n     * @param {Function} [callback] Callback is invoked when color is set\n     */\n    __setBgOverlayColor: function(property, color, callback) {\n      this[property] = color;\n      this._initGradient(color, property);\n      this._initPattern(color, property, callback);\n      return this;\n    },\n\n    /**\n     * @private\n     */\n    _createCanvasElement: function() {\n      var element = createCanvasElement();\n      if (!element) {\n        throw CANVAS_INIT_ERROR;\n      }\n      if (!element.style) {\n        element.style = { };\n      }\n      if (typeof element.getContext === 'undefined') {\n        throw CANVAS_INIT_ERROR;\n      }\n      return element;\n    },\n\n    /**\n     * @private\n     * @param {Object} [options] Options object\n     */\n    _initOptions: function (options) {\n      var lowerCanvasEl = this.lowerCanvasEl;\n      this._setOptions(options);\n\n      this.width = this.width || parseInt(lowerCanvasEl.width, 10) || 0;\n      this.height = this.height || parseInt(lowerCanvasEl.height, 10) || 0;\n\n      if (!this.lowerCanvasEl.style) {\n        return;\n      }\n\n      lowerCanvasEl.width = this.width;\n      lowerCanvasEl.height = this.height;\n\n      lowerCanvasEl.style.width = this.width + 'px';\n      lowerCanvasEl.style.height = this.height + 'px';\n\n      this.viewportTransform = this.viewportTransform.slice();\n    },\n\n    /**\n     * Creates a bottom canvas\n     * @private\n     * @param {HTMLElement} [canvasEl]\n     */\n    _createLowerCanvas: function (canvasEl) {\n      // canvasEl === 'HTMLCanvasElement' does not work on jsdom/node\n      if (canvasEl && canvasEl.getContext) {\n        this.lowerCanvasEl = canvasEl;\n      }\n      else {\n        this.lowerCanvasEl = fabric.util.getById(canvasEl) || this._createCanvasElement();\n      }\n\n      fabric.util.addClass(this.lowerCanvasEl, 'lower-canvas');\n\n      if (this.interactive) {\n        this._applyCanvasStyle(this.lowerCanvasEl);\n      }\n\n      this.contextContainer = this.lowerCanvasEl.getContext('2d');\n    },\n\n    /**\n     * Returns canvas width (in px)\n     * @return {Number}\n     */\n    getWidth: function () {\n      return this.width;\n    },\n\n    /**\n     * Returns canvas height (in px)\n     * @return {Number}\n     */\n    getHeight: function () {\n      return this.height;\n    },\n\n    /**\n     * Sets width of this canvas instance\n     * @param {Number|String} value                         Value to set width to\n     * @param {Object}        [options]                     Options object\n     * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n     * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    setWidth: function (value, options) {\n      return this.setDimensions({ width: value }, options);\n    },\n\n    /**\n     * Sets height of this canvas instance\n     * @param {Number|String} value                         Value to set height to\n     * @param {Object}        [options]                     Options object\n     * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n     * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    setHeight: function (value, options) {\n      return this.setDimensions({ height: value }, options);\n    },\n\n    /**\n     * Sets dimensions (width, height) of this canvas instance. when options.cssOnly flag active you should also supply the unit of measure (px/%/em)\n     * @param {Object}        dimensions                    Object with width/height properties\n     * @param {Number|String} [dimensions.width]            Width of canvas element\n     * @param {Number|String} [dimensions.height]           Height of canvas element\n     * @param {Object}        [options]                     Options object\n     * @param {Boolean}       [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n     * @param {Boolean}       [options.cssOnly=false]       Set the given dimensions only as css dimensions\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    setDimensions: function (dimensions, options) {\n      var cssValue;\n\n      options = options || {};\n\n      for (var prop in dimensions) {\n        cssValue = dimensions[prop];\n\n        if (!options.cssOnly) {\n          this._setBackstoreDimension(prop, dimensions[prop]);\n          cssValue += 'px';\n          this.hasLostContext = true;\n        }\n\n        if (!options.backstoreOnly) {\n          this._setCssDimension(prop, cssValue);\n        }\n      }\n      if (this._isCurrentlyDrawing) {\n        this.freeDrawingBrush && this.freeDrawingBrush._setBrushStyles();\n      }\n      this._initRetinaScaling();\n      this._setImageSmoothing();\n      this.calcOffset();\n\n      if (!options.cssOnly) {\n        this.requestRenderAll();\n      }\n\n      return this;\n    },\n\n    /**\n     * Helper for setting width/height\n     * @private\n     * @param {String} prop property (width|height)\n     * @param {Number} value value to set property to\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    _setBackstoreDimension: function (prop, value) {\n      this.lowerCanvasEl[prop] = value;\n\n      if (this.upperCanvasEl) {\n        this.upperCanvasEl[prop] = value;\n      }\n\n      if (this.cacheCanvasEl) {\n        this.cacheCanvasEl[prop] = value;\n      }\n\n      this[prop] = value;\n\n      return this;\n    },\n\n    /**\n     * Helper for setting css width/height\n     * @private\n     * @param {String} prop property (width|height)\n     * @param {String} value value to set property to\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    _setCssDimension: function (prop, value) {\n      this.lowerCanvasEl.style[prop] = value;\n\n      if (this.upperCanvasEl) {\n        this.upperCanvasEl.style[prop] = value;\n      }\n\n      if (this.wrapperEl) {\n        this.wrapperEl.style[prop] = value;\n      }\n\n      return this;\n    },\n\n    /**\n     * Returns canvas zoom level\n     * @return {Number}\n     */\n    getZoom: function () {\n      return this.viewportTransform[0];\n    },\n\n    /**\n     * Sets viewport transform of this canvas instance\n     * @param {Array} vpt the transform in the form of context.transform\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    setViewportTransform: function (vpt) {\n      var activeObject = this._activeObject, object, ignoreVpt = false, skipAbsolute = true, i, len;\n      this.viewportTransform = vpt;\n      for (i = 0, len = this._objects.length; i < len; i++) {\n        object = this._objects[i];\n        object.group || object.setCoords(ignoreVpt, skipAbsolute);\n      }\n      if (activeObject && activeObject.type === 'activeSelection') {\n        activeObject.setCoords(ignoreVpt, skipAbsolute);\n      }\n      this.calcViewportBoundaries();\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * Sets zoom level of this canvas instance, zoom centered around point\n     * @param {fabric.Point} point to zoom with respect to\n     * @param {Number} value to set zoom to, less than 1 zooms out\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    zoomToPoint: function (point, value) {\n      // TODO: just change the scale, preserve other transformations\n      var before = point, vpt = this.viewportTransform.slice(0);\n      point = transformPoint(point, invertTransform(this.viewportTransform));\n      vpt[0] = value;\n      vpt[3] = value;\n      var after = transformPoint(point, vpt);\n      vpt[4] += before.x - after.x;\n      vpt[5] += before.y - after.y;\n      return this.setViewportTransform(vpt);\n    },\n\n    /**\n     * Sets zoom level of this canvas instance\n     * @param {Number} value to set zoom to, less than 1 zooms out\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    setZoom: function (value) {\n      this.zoomToPoint(new fabric.Point(0, 0), value);\n      return this;\n    },\n\n    /**\n     * Pan viewport so as to place point at top left corner of canvas\n     * @param {fabric.Point} point to move to\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    absolutePan: function (point) {\n      var vpt = this.viewportTransform.slice(0);\n      vpt[4] = -point.x;\n      vpt[5] = -point.y;\n      return this.setViewportTransform(vpt);\n    },\n\n    /**\n     * Pans viewpoint relatively\n     * @param {fabric.Point} point (position vector) to move by\n     * @return {fabric.Canvas} instance\n     * @chainable true\n     */\n    relativePan: function (point) {\n      return this.absolutePan(new fabric.Point(\n        -point.x - this.viewportTransform[4],\n        -point.y - this.viewportTransform[5]\n      ));\n    },\n\n    /**\n     * Returns &lt;canvas> element corresponding to this instance\n     * @return {HTMLCanvasElement}\n     */\n    getElement: function () {\n      return this.lowerCanvasEl;\n    },\n\n    /**\n     * @private\n     * @param {fabric.Object} obj Object that was added\n     */\n    _onObjectAdded: function(obj) {\n      this.stateful && obj.setupState();\n      obj._set('canvas', this);\n      obj.setCoords();\n      this.fire('object:added', { target: obj });\n      obj.fire('added');\n    },\n\n    /**\n     * @private\n     * @param {fabric.Object} obj Object that was removed\n     */\n    _onObjectRemoved: function(obj) {\n      this.fire('object:removed', { target: obj });\n      obj.fire('removed');\n      delete obj.canvas;\n    },\n\n    /**\n     * Clears specified context of canvas element\n     * @param {CanvasRenderingContext2D} ctx Context to clear\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    clearContext: function(ctx) {\n      ctx.clearRect(0, 0, this.width, this.height);\n      return this;\n    },\n\n    /**\n     * Returns context of canvas where objects are drawn\n     * @return {CanvasRenderingContext2D}\n     */\n    getContext: function () {\n      return this.contextContainer;\n    },\n\n    /**\n     * Clears all contexts (background, main, top) of an instance\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    clear: function () {\n      this._objects.length = 0;\n      this.backgroundImage = null;\n      this.overlayImage = null;\n      this.backgroundColor = '';\n      this.overlayColor = '';\n      if (this._hasITextHandlers) {\n        this.off('mouse:up', this._mouseUpITextHandler);\n        this._iTextInstances = null;\n        this._hasITextHandlers = false;\n      }\n      this.clearContext(this.contextContainer);\n      this.fire('canvas:cleared');\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * Renders the canvas\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    renderAll: function () {\n      var canvasToDrawOn = this.contextContainer;\n      this.renderCanvas(canvasToDrawOn, this._objects);\n      return this;\n    },\n\n    /**\n     * Function created to be instance bound at initialization\n     * used in requestAnimationFrame rendering\n     * Let the fabricJS call it. If you call it manually you could have more\n     * animationFrame stacking on to of each other\n     * for an imperative rendering, use canvas.renderAll\n     * @private\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    renderAndReset: function() {\n      this.isRendering = 0;\n      this.renderAll();\n    },\n\n    /**\n     * Append a renderAll request to next animation frame.\n     * unless one is already in progress, in that case nothing is done\n     * a boolean flag will avoid appending more.\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    requestRenderAll: function () {\n      if (!this.isRendering) {\n        this.isRendering = fabric.util.requestAnimFrame(this.renderAndResetBound);\n      }\n      return this;\n    },\n\n    /**\n     * Calculate the position of the 4 corner of canvas with current viewportTransform.\n     * helps to determinate when an object is in the current rendering viewport using\n     * object absolute coordinates ( aCoords )\n     * @return {Object} points.tl\n     * @chainable\n     */\n    calcViewportBoundaries: function() {\n      var points = { }, width = this.width, height = this.height,\n          iVpt = invertTransform(this.viewportTransform);\n      points.tl = transformPoint({ x: 0, y: 0 }, iVpt);\n      points.br = transformPoint({ x: width, y: height }, iVpt);\n      points.tr = new fabric.Point(points.br.x, points.tl.y);\n      points.bl = new fabric.Point(points.tl.x, points.br.y);\n      this.vptCoords = points;\n      return points;\n    },\n\n    cancelRequestedRender: function() {\n      if (this.isRendering) {\n        fabric.util.cancelAnimFrame(this.isRendering);\n        this.isRendering = 0;\n      }\n    },\n\n    /**\n     * Renders background, objects, overlay and controls.\n     * @param {CanvasRenderingContext2D} ctx\n     * @param {Array} objects to render\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    renderCanvas: function(ctx, objects) {\n      var v = this.viewportTransform, path = this.clipPath;\n      this.cancelRequestedRender();\n      this.calcViewportBoundaries();\n      this.clearContext(ctx);\n      this.fire('before:render', { ctx: ctx, });\n      if (this.clipTo) {\n        fabric.util.clipContext(this, ctx);\n      }\n      this._renderBackground(ctx);\n\n      ctx.save();\n      //apply viewport transform once for all rendering process\n      ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n      this._renderObjects(ctx, objects);\n      ctx.restore();\n      if (!this.controlsAboveOverlay && this.interactive) {\n        this.drawControls(ctx);\n      }\n      if (this.clipTo) {\n        ctx.restore();\n      }\n      if (path) {\n        path.canvas = this;\n        // needed to setup a couple of variables\n        path.shouldCache();\n        path._transformDone = true;\n        path.renderCache({ forClipping: true });\n        this.drawClipPathOnCanvas(ctx);\n      }\n      this._renderOverlay(ctx);\n      if (this.controlsAboveOverlay && this.interactive) {\n        this.drawControls(ctx);\n      }\n      this.fire('after:render', { ctx: ctx, });\n    },\n\n    /**\n     * Paint the cached clipPath on the lowerCanvasEl\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    drawClipPathOnCanvas: function(ctx) {\n      var v = this.viewportTransform, path = this.clipPath;\n      ctx.save();\n      ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n      // DEBUG: uncomment this line, comment the following\n      // ctx.globalAlpha = 0.4;\n      ctx.globalCompositeOperation = 'destination-in';\n      path.transform(ctx);\n      ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n      ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n      ctx.restore();\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     * @param {Array} objects to render\n     */\n    _renderObjects: function(ctx, objects) {\n      var i, len;\n      for (i = 0, len = objects.length; i < len; ++i) {\n        objects[i] && objects[i].render(ctx);\n      }\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     * @param {string} property 'background' or 'overlay'\n     */\n    _renderBackgroundOrOverlay: function(ctx, property) {\n      var fill = this[property + 'Color'], object = this[property + 'Image'],\n          v = this.viewportTransform, needsVpt = this[property + 'Vpt'];\n      if (!fill && !object) {\n        return;\n      }\n      if (fill) {\n        ctx.save();\n        ctx.beginPath();\n        ctx.moveTo(0, 0);\n        ctx.lineTo(this.width, 0);\n        ctx.lineTo(this.width, this.height);\n        ctx.lineTo(0, this.height);\n        ctx.closePath();\n        ctx.fillStyle = fill.toLive\n          ? fill.toLive(ctx, this)\n          : fill;\n        if (needsVpt) {\n          ctx.transform(\n            v[0], v[1], v[2], v[3],\n            v[4] + (fill.offsetX || 0),\n            v[5] + (fill.offsetY || 0)\n          );\n        }\n        var m = fill.gradientTransform || fill.patternTransform;\n        m && ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n        ctx.fill();\n        ctx.restore();\n      }\n      if (object) {\n        ctx.save();\n        if (needsVpt) {\n          ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n        }\n        object.render(ctx);\n        ctx.restore();\n      }\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderBackground: function(ctx) {\n      this._renderBackgroundOrOverlay(ctx, 'background');\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderOverlay: function(ctx) {\n      this._renderBackgroundOrOverlay(ctx, 'overlay');\n    },\n\n    /**\n     * Returns coordinates of a center of canvas.\n     * Returned value is an object with top and left properties\n     * @return {Object} object with \"top\" and \"left\" number values\n     */\n    getCenter: function () {\n      return {\n        top: this.height / 2,\n        left: this.width / 2\n      };\n    },\n\n    /**\n     * Centers object horizontally in the canvas\n     * @param {fabric.Object} object Object to center horizontally\n     * @return {fabric.Canvas} thisArg\n     */\n    centerObjectH: function (object) {\n      return this._centerObject(object, new fabric.Point(this.getCenter().left, object.getCenterPoint().y));\n    },\n\n    /**\n     * Centers object vertically in the canvas\n     * @param {fabric.Object} object Object to center vertically\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    centerObjectV: function (object) {\n      return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, this.getCenter().top));\n    },\n\n    /**\n     * Centers object vertically and horizontally in the canvas\n     * @param {fabric.Object} object Object to center vertically and horizontally\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    centerObject: function(object) {\n      var center = this.getCenter();\n\n      return this._centerObject(object, new fabric.Point(center.left, center.top));\n    },\n\n    /**\n     * Centers object vertically and horizontally in the viewport\n     * @param {fabric.Object} object Object to center vertically and horizontally\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    viewportCenterObject: function(object) {\n      var vpCenter = this.getVpCenter();\n\n      return this._centerObject(object, vpCenter);\n    },\n\n    /**\n     * Centers object horizontally in the viewport, object.top is unchanged\n     * @param {fabric.Object} object Object to center vertically and horizontally\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    viewportCenterObjectH: function(object) {\n      var vpCenter = this.getVpCenter();\n      this._centerObject(object, new fabric.Point(vpCenter.x, object.getCenterPoint().y));\n      return this;\n    },\n\n    /**\n     * Centers object Vertically in the viewport, object.top is unchanged\n     * @param {fabric.Object} object Object to center vertically and horizontally\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    viewportCenterObjectV: function(object) {\n      var vpCenter = this.getVpCenter();\n\n      return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, vpCenter.y));\n    },\n\n    /**\n     * Calculate the point in canvas that correspond to the center of actual viewport.\n     * @return {fabric.Point} vpCenter, viewport center\n     * @chainable\n     */\n    getVpCenter: function() {\n      var center = this.getCenter(),\n          iVpt = invertTransform(this.viewportTransform);\n      return transformPoint({ x: center.left, y: center.top }, iVpt);\n    },\n\n    /**\n     * @private\n     * @param {fabric.Object} object Object to center\n     * @param {fabric.Point} center Center point\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    _centerObject: function(object, center) {\n      object.setPositionByOrigin(center, 'center', 'center');\n      object.setCoords();\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * Returs dataless JSON representation of canvas\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {String} json string\n     */\n    toDatalessJSON: function (propertiesToInclude) {\n      return this.toDatalessObject(propertiesToInclude);\n    },\n\n    /**\n     * Returns object representation of canvas\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function (propertiesToInclude) {\n      return this._toObjectMethod('toObject', propertiesToInclude);\n    },\n\n    /**\n     * Returns dataless object representation of canvas\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toDatalessObject: function (propertiesToInclude) {\n      return this._toObjectMethod('toDatalessObject', propertiesToInclude);\n    },\n\n    /**\n     * @private\n     */\n    _toObjectMethod: function (methodName, propertiesToInclude) {\n\n      var clipPath = this.clipPath, data = {\n        version: fabric.version,\n        objects: this._toObjects(methodName, propertiesToInclude),\n      };\n      if (clipPath) {\n        data.clipPath = this._toObject(this.clipPath, methodName, propertiesToInclude);\n      }\n      extend(data, this.__serializeBgOverlay(methodName, propertiesToInclude));\n\n      fabric.util.populateWithProperties(this, data, propertiesToInclude);\n\n      return data;\n    },\n\n    /**\n     * @private\n     */\n    _toObjects: function(methodName, propertiesToInclude) {\n      return this._objects.filter(function(object) {\n        return !object.excludeFromExport;\n      }).map(function(instance) {\n        return this._toObject(instance, methodName, propertiesToInclude);\n      }, this);\n    },\n\n    /**\n     * @private\n     */\n    _toObject: function(instance, methodName, propertiesToInclude) {\n      var originalValue;\n\n      if (!this.includeDefaultValues) {\n        originalValue = instance.includeDefaultValues;\n        instance.includeDefaultValues = false;\n      }\n\n      var object = instance[methodName](propertiesToInclude);\n      if (!this.includeDefaultValues) {\n        instance.includeDefaultValues = originalValue;\n      }\n      return object;\n    },\n\n    /**\n     * @private\n     */\n    __serializeBgOverlay: function(methodName, propertiesToInclude) {\n      var data = { }, bgImage = this.backgroundImage, overlay = this.overlayImage;\n\n      if (this.backgroundColor) {\n        data.background = this.backgroundColor.toObject\n          ? this.backgroundColor.toObject(propertiesToInclude)\n          : this.backgroundColor;\n      }\n\n      if (this.overlayColor) {\n        data.overlay = this.overlayColor.toObject\n          ? this.overlayColor.toObject(propertiesToInclude)\n          : this.overlayColor;\n      }\n      if (bgImage && !bgImage.excludeFromExport) {\n        data.backgroundImage = this._toObject(bgImage, methodName, propertiesToInclude);\n      }\n      if (overlay && !overlay.excludeFromExport) {\n        data.overlayImage = this._toObject(overlay, methodName, propertiesToInclude);\n      }\n\n      return data;\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * When true, getSvgTransform() will apply the StaticCanvas.viewportTransform to the SVG transformation. When true,\n     * a zoomed canvas will then produce zoomed SVG output.\n     * @type Boolean\n     * @default\n     */\n    svgViewportTransformation: true,\n\n    /**\n     * Returns SVG representation of canvas\n     * @function\n     * @param {Object} [options] Options object for SVG output\n     * @param {Boolean} [options.suppressPreamble=false] If true xml tag is not included\n     * @param {Object} [options.viewBox] SVG viewbox object\n     * @param {Number} [options.viewBox.x] x-cooridnate of viewbox\n     * @param {Number} [options.viewBox.y] y-coordinate of viewbox\n     * @param {Number} [options.viewBox.width] Width of viewbox\n     * @param {Number} [options.viewBox.height] Height of viewbox\n     * @param {String} [options.encoding=UTF-8] Encoding of SVG output\n     * @param {String} [options.width] desired width of svg with or without units\n     * @param {String} [options.height] desired height of svg with or without units\n     * @param {Function} [reviver] Method for further parsing of svg elements, called after each fabric object converted into svg representation.\n     * @return {String} SVG string\n     * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n     * @see {@link http://jsfiddle.net/fabricjs/jQ3ZZ/|jsFiddle demo}\n     * @example <caption>Normal SVG output</caption>\n     * var svg = canvas.toSVG();\n     * @example <caption>SVG output without preamble (without &lt;?xml ../>)</caption>\n     * var svg = canvas.toSVG({suppressPreamble: true});\n     * @example <caption>SVG output with viewBox attribute</caption>\n     * var svg = canvas.toSVG({\n     *   viewBox: {\n     *     x: 100,\n     *     y: 100,\n     *     width: 200,\n     *     height: 300\n     *   }\n     * });\n     * @example <caption>SVG output with different encoding (default: UTF-8)</caption>\n     * var svg = canvas.toSVG({encoding: 'ISO-8859-1'});\n     * @example <caption>Modify SVG output with reviver function</caption>\n     * var svg = canvas.toSVG(null, function(svg) {\n     *   return svg.replace('stroke-dasharray: ; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 10; ', '');\n     * });\n     */\n    toSVG: function(options, reviver) {\n      options || (options = { });\n      options.reviver = reviver;\n      var markup = [];\n\n      this._setSVGPreamble(markup, options);\n      this._setSVGHeader(markup, options);\n      if (this.clipPath) {\n        markup.push('<g clip-path=\"url(#' + this.clipPath.clipPathId + ')\" >\\n');\n      }\n      this._setSVGBgOverlayColor(markup, 'background');\n      this._setSVGBgOverlayImage(markup, 'backgroundImage', reviver);\n      this._setSVGObjects(markup, reviver);\n      if (this.clipPath) {\n        markup.push('</g>\\n');\n      }\n      this._setSVGBgOverlayColor(markup, 'overlay');\n      this._setSVGBgOverlayImage(markup, 'overlayImage', reviver);\n\n      markup.push('</svg>');\n\n      return markup.join('');\n    },\n\n    /**\n     * @private\n     */\n    _setSVGPreamble: function(markup, options) {\n      if (options.suppressPreamble) {\n        return;\n      }\n      markup.push(\n        '<?xml version=\"1.0\" encoding=\"', (options.encoding || 'UTF-8'), '\" standalone=\"no\" ?>\\n',\n        '<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" ',\n        '\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\\n'\n      );\n    },\n\n    /**\n     * @private\n     */\n    _setSVGHeader: function(markup, options) {\n      var width = options.width || this.width,\n          height = options.height || this.height,\n          vpt, viewBox = 'viewBox=\"0 0 ' + this.width + ' ' + this.height + '\" ',\n          NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n      if (options.viewBox) {\n        viewBox = 'viewBox=\"' +\n                options.viewBox.x + ' ' +\n                options.viewBox.y + ' ' +\n                options.viewBox.width + ' ' +\n                options.viewBox.height + '\" ';\n      }\n      else {\n        if (this.svgViewportTransformation) {\n          vpt = this.viewportTransform;\n          viewBox = 'viewBox=\"' +\n                  toFixed(-vpt[4] / vpt[0], NUM_FRACTION_DIGITS) + ' ' +\n                  toFixed(-vpt[5] / vpt[3], NUM_FRACTION_DIGITS) + ' ' +\n                  toFixed(this.width / vpt[0], NUM_FRACTION_DIGITS) + ' ' +\n                  toFixed(this.height / vpt[3], NUM_FRACTION_DIGITS) + '\" ';\n        }\n      }\n\n      markup.push(\n        '<svg ',\n        'xmlns=\"http://www.w3.org/2000/svg\" ',\n        'xmlns:xlink=\"http://www.w3.org/1999/xlink\" ',\n        'version=\"1.1\" ',\n        'width=\"', width, '\" ',\n        'height=\"', height, '\" ',\n        viewBox,\n        'xml:space=\"preserve\">\\n',\n        '<desc>Created with Fabric.js ', fabric.version, '</desc>\\n',\n        '<defs>\\n',\n        this.createSVGFontFacesMarkup(),\n        this.createSVGRefElementsMarkup(),\n        this.createSVGClipPathMarkup(options),\n        '</defs>\\n'\n      );\n    },\n\n    createSVGClipPathMarkup: function(options) {\n      var clipPath = this.clipPath;\n      if (clipPath) {\n        clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n        return  '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' +\n          this.clipPath.toClipPathSVG(options.reviver) +\n          '</clipPath>\\n';\n      }\n      return '';\n    },\n\n    /**\n     * Creates markup containing SVG referenced elements like patterns, gradients etc.\n     * @return {String}\n     */\n    createSVGRefElementsMarkup: function() {\n      var _this = this,\n          markup = ['background', 'overlay'].map(function(prop) {\n            var fill = _this[prop + 'Color'];\n            if (fill && fill.toLive) {\n              var shouldTransform = _this[prop + 'Vpt'], vpt = _this.viewportTransform,\n                  object = {\n                    width: _this.width / (shouldTransform ? vpt[0] : 1),\n                    height: _this.height / (shouldTransform ? vpt[3] : 1)\n                  };\n              return fill.toSVG(\n                object,\n                { additionalTransform: shouldTransform ? fabric.util.matrixToSVG(vpt) : '' }\n              );\n            }\n          });\n      return markup.join('');\n    },\n\n    /**\n     * Creates markup containing SVG font faces,\n     * font URLs for font faces must be collected by developers\n     * and are not extracted from the DOM by fabricjs\n     * @param {Array} objects Array of fabric objects\n     * @return {String}\n     */\n    createSVGFontFacesMarkup: function() {\n      var markup = '', fontList = { }, obj, fontFamily,\n          style, row, rowIndex, _char, charIndex, i, len,\n          fontPaths = fabric.fontPaths, objects = this._objects;\n\n      for (i = 0, len = objects.length; i < len; i++) {\n        obj = objects[i];\n        fontFamily = obj.fontFamily;\n        if (obj.type.indexOf('text') === -1 || fontList[fontFamily] || !fontPaths[fontFamily]) {\n          continue;\n        }\n        fontList[fontFamily] = true;\n        if (!obj.styles) {\n          continue;\n        }\n        style = obj.styles;\n        for (rowIndex in style) {\n          row = style[rowIndex];\n          for (charIndex in row) {\n            _char = row[charIndex];\n            fontFamily = _char.fontFamily;\n            if (!fontList[fontFamily] && fontPaths[fontFamily]) {\n              fontList[fontFamily] = true;\n            }\n          }\n        }\n      }\n\n      for (var j in fontList) {\n        markup += [\n          '\\t\\t@font-face {\\n',\n          '\\t\\t\\tfont-family: \\'', j, '\\';\\n',\n          '\\t\\t\\tsrc: url(\\'', fontPaths[j], '\\');\\n',\n          '\\t\\t}\\n'\n        ].join('');\n      }\n\n      if (markup) {\n        markup = [\n          '\\t<style type=\"text/css\">',\n          '<![CDATA[\\n',\n          markup,\n          ']]>',\n          '</style>\\n'\n        ].join('');\n      }\n\n      return markup;\n    },\n\n    /**\n     * @private\n     */\n    _setSVGObjects: function(markup, reviver) {\n      var instance, i, len, objects = this._objects;\n      for (i = 0, len = objects.length; i < len; i++) {\n        instance = objects[i];\n        if (instance.excludeFromExport) {\n          continue;\n        }\n        this._setSVGObject(markup, instance, reviver);\n      }\n    },\n\n    /**\n     * @private\n     */\n    _setSVGObject: function(markup, instance, reviver) {\n      markup.push(instance.toSVG(reviver));\n    },\n\n    /**\n     * @private\n     */\n    _setSVGBgOverlayImage: function(markup, property, reviver) {\n      if (this[property] && !this[property].excludeFromExport && this[property].toSVG) {\n        markup.push(this[property].toSVG(reviver));\n      }\n    },\n\n    /**\n     * @private\n     */\n    _setSVGBgOverlayColor: function(markup, property) {\n      var filler = this[property + 'Color'], vpt = this.viewportTransform, finalWidth = this.width,\n          finalHeight = this.height;\n      if (!filler) {\n        return;\n      }\n      if (filler.toLive) {\n        var repeat = filler.repeat, iVpt = fabric.util.invertTransform(vpt), shouldInvert = this[property + 'Vpt'],\n            additionalTransform = shouldInvert ? fabric.util.matrixToSVG(iVpt) : '';\n        markup.push(\n          '<rect transform=\"' + additionalTransform + ' translate(', finalWidth / 2, ',', finalHeight / 2, ')\"',\n          ' x=\"', filler.offsetX - finalWidth / 2,\n          '\" y=\"', filler.offsetY - finalHeight / 2, '\" ',\n          'width=\"',\n          (repeat === 'repeat-y' || repeat === 'no-repeat'\n            ? filler.source.width\n            : finalWidth ),\n          '\" height=\"',\n          (repeat === 'repeat-x' || repeat === 'no-repeat'\n            ? filler.source.height\n            : finalHeight),\n          '\" fill=\"url(#SVGID_' + filler.id + ')\"',\n          '></rect>\\n'\n        );\n      }\n      else {\n        markup.push(\n          '<rect x=\"0\" y=\"0\" width=\"100%\" height=\"100%\" ',\n          'fill=\"', filler, '\"',\n          '></rect>\\n'\n        );\n      }\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * Moves an object or the objects of a multiple selection\n     * to the bottom of the stack of drawn objects\n     * @param {fabric.Object} object Object to send to back\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    sendToBack: function (object) {\n      if (!object) {\n        return this;\n      }\n      var activeSelection = this._activeObject,\n          i, obj, objs;\n      if (object === activeSelection && object.type === 'activeSelection') {\n        objs = activeSelection._objects;\n        for (i = objs.length; i--;) {\n          obj = objs[i];\n          removeFromArray(this._objects, obj);\n          this._objects.unshift(obj);\n        }\n      }\n      else {\n        removeFromArray(this._objects, object);\n        this._objects.unshift(object);\n      }\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * Moves an object or the objects of a multiple selection\n     * to the top of the stack of drawn objects\n     * @param {fabric.Object} object Object to send\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    bringToFront: function (object) {\n      if (!object) {\n        return this;\n      }\n      var activeSelection = this._activeObject,\n          i, obj, objs;\n      if (object === activeSelection && object.type === 'activeSelection') {\n        objs = activeSelection._objects;\n        for (i = 0; i < objs.length; i++) {\n          obj = objs[i];\n          removeFromArray(this._objects, obj);\n          this._objects.push(obj);\n        }\n      }\n      else {\n        removeFromArray(this._objects, object);\n        this._objects.push(object);\n      }\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * Moves an object or a selection down in stack of drawn objects\n     * An optional paramter, intersecting allowes to move the object in behind\n     * the first intersecting object. Where intersection is calculated with\n     * bounding box. If no intersection is found, there will not be change in the\n     * stack.\n     * @param {fabric.Object} object Object to send\n     * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    sendBackwards: function (object, intersecting) {\n      if (!object) {\n        return this;\n      }\n      var activeSelection = this._activeObject,\n          i, obj, idx, newIdx, objs, objsMoved = 0;\n\n      if (object === activeSelection && object.type === 'activeSelection') {\n        objs = activeSelection._objects;\n        for (i = 0; i < objs.length; i++) {\n          obj = objs[i];\n          idx = this._objects.indexOf(obj);\n          if (idx > 0 + objsMoved) {\n            newIdx = idx - 1;\n            removeFromArray(this._objects, obj);\n            this._objects.splice(newIdx, 0, obj);\n          }\n          objsMoved++;\n        }\n      }\n      else {\n        idx = this._objects.indexOf(object);\n        if (idx !== 0) {\n          // if object is not on the bottom of stack\n          newIdx = this._findNewLowerIndex(object, idx, intersecting);\n          removeFromArray(this._objects, object);\n          this._objects.splice(newIdx, 0, object);\n        }\n      }\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * @private\n     */\n    _findNewLowerIndex: function(object, idx, intersecting) {\n      var newIdx, i;\n\n      if (intersecting) {\n        newIdx = idx;\n\n        // traverse down the stack looking for the nearest intersecting object\n        for (i = idx - 1; i >= 0; --i) {\n\n          var isIntersecting = object.intersectsWithObject(this._objects[i]) ||\n                               object.isContainedWithinObject(this._objects[i]) ||\n                               this._objects[i].isContainedWithinObject(object);\n\n          if (isIntersecting) {\n            newIdx = i;\n            break;\n          }\n        }\n      }\n      else {\n        newIdx = idx - 1;\n      }\n\n      return newIdx;\n    },\n\n    /**\n     * Moves an object or a selection up in stack of drawn objects\n     * An optional paramter, intersecting allowes to move the object in front\n     * of the first intersecting object. Where intersection is calculated with\n     * bounding box. If no intersection is found, there will not be change in the\n     * stack.\n     * @param {fabric.Object} object Object to send\n     * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    bringForward: function (object, intersecting) {\n      if (!object) {\n        return this;\n      }\n      var activeSelection = this._activeObject,\n          i, obj, idx, newIdx, objs, objsMoved = 0;\n\n      if (object === activeSelection && object.type === 'activeSelection') {\n        objs = activeSelection._objects;\n        for (i = objs.length; i--;) {\n          obj = objs[i];\n          idx = this._objects.indexOf(obj);\n          if (idx < this._objects.length - 1 - objsMoved) {\n            newIdx = idx + 1;\n            removeFromArray(this._objects, obj);\n            this._objects.splice(newIdx, 0, obj);\n          }\n          objsMoved++;\n        }\n      }\n      else {\n        idx = this._objects.indexOf(object);\n        if (idx !== this._objects.length - 1) {\n          // if object is not on top of stack (last item in an array)\n          newIdx = this._findNewUpperIndex(object, idx, intersecting);\n          removeFromArray(this._objects, object);\n          this._objects.splice(newIdx, 0, object);\n        }\n      }\n      this.renderOnAddRemove && this.requestRenderAll();\n      return this;\n    },\n\n    /**\n     * @private\n     */\n    _findNewUpperIndex: function(object, idx, intersecting) {\n      var newIdx, i, len;\n\n      if (intersecting) {\n        newIdx = idx;\n\n        // traverse up the stack looking for the nearest intersecting object\n        for (i = idx + 1, len = this._objects.length; i < len; ++i) {\n\n          var isIntersecting = object.intersectsWithObject(this._objects[i]) ||\n                               object.isContainedWithinObject(this._objects[i]) ||\n                               this._objects[i].isContainedWithinObject(object);\n\n          if (isIntersecting) {\n            newIdx = i;\n            break;\n          }\n        }\n      }\n      else {\n        newIdx = idx + 1;\n      }\n\n      return newIdx;\n    },\n\n    /**\n     * Moves an object to specified level in stack of drawn objects\n     * @param {fabric.Object} object Object to send\n     * @param {Number} index Position to move to\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    moveTo: function (object, index) {\n      removeFromArray(this._objects, object);\n      this._objects.splice(index, 0, object);\n      return this.renderOnAddRemove && this.requestRenderAll();\n    },\n\n    /**\n     * Clears a canvas element and dispose objects\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    dispose: function () {\n      // cancel eventually ongoing renders\n      if (this.isRendering) {\n        fabric.util.cancelAnimFrame(this.isRendering);\n        this.isRendering = 0;\n      }\n      this.forEachObject(function(object) {\n        object.dispose && object.dispose();\n      });\n      this._objects = [];\n      if (this.backgroundImage && this.backgroundImage.dispose) {\n        this.backgroundImage.dispose();\n      }\n      this.backgroundImage = null;\n      if (this.overlayImage && this.overlayImage.dispose) {\n        this.overlayImage.dispose();\n      }\n      this.overlayImage = null;\n      this._iTextInstances = null;\n      this.contextContainer = null;\n      fabric.util.cleanUpJsdomNode(this.lowerCanvasEl);\n      this.lowerCanvasEl = undefined;\n      return this;\n    },\n\n    /**\n     * Returns a string representation of an instance\n     * @return {String} string representation of an instance\n     */\n    toString: function () {\n      return '#<fabric.Canvas (' + this.complexity() + '): ' +\n               '{ objects: ' + this._objects.length + ' }>';\n    }\n  });\n\n  extend(fabric.StaticCanvas.prototype, fabric.Observable);\n  extend(fabric.StaticCanvas.prototype, fabric.Collection);\n  extend(fabric.StaticCanvas.prototype, fabric.DataURLExporter);\n\n  extend(fabric.StaticCanvas, /** @lends fabric.StaticCanvas */ {\n\n    /**\n     * @static\n     * @type String\n     * @default\n     */\n    EMPTY_JSON: '{\"objects\": [], \"background\": \"white\"}',\n\n    /**\n     * Provides a way to check support of some of the canvas methods\n     * (either those of HTMLCanvasElement itself, or rendering context)\n     *\n     * @param {String} methodName Method to check support for;\n     *                            Could be one of \"setLineDash\"\n     * @return {Boolean | null} `true` if method is supported (or at least exists),\n     *                          `null` if canvas element or context can not be initialized\n     */\n    supports: function (methodName) {\n      var el = createCanvasElement();\n\n      if (!el || !el.getContext) {\n        return null;\n      }\n\n      var ctx = el.getContext('2d');\n      if (!ctx) {\n        return null;\n      }\n\n      switch (methodName) {\n\n        case 'setLineDash':\n          return typeof ctx.setLineDash !== 'undefined';\n\n        default:\n          return null;\n      }\n    }\n  });\n\n  /**\n   * Returns JSON representation of canvas\n   * @function\n   * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n   * @return {String} JSON string\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n   * @see {@link http://jsfiddle.net/fabricjs/pec86/|jsFiddle demo}\n   * @example <caption>JSON without additional properties</caption>\n   * var json = canvas.toJSON();\n   * @example <caption>JSON with additional properties included</caption>\n   * var json = canvas.toJSON(['lockMovementX', 'lockMovementY', 'lockRotation', 'lockScalingX', 'lockScalingY', 'lockUniScaling']);\n   * @example <caption>JSON without default values</caption>\n   * canvas.includeDefaultValues = false;\n   * var json = canvas.toJSON();\n   */\n  fabric.StaticCanvas.prototype.toJSON = fabric.StaticCanvas.prototype.toObject;\n\n  if (fabric.isLikelyNode) {\n    fabric.StaticCanvas.prototype.createPNGStream = function() {\n      var impl = getNodeCanvas(this.lowerCanvasEl);\n      return impl && impl.createPNGStream();\n    };\n    fabric.StaticCanvas.prototype.createJPEGStream = function(opts) {\n      var impl = getNodeCanvas(this.lowerCanvasEl);\n      return impl && impl.createJPEGStream(opts);\n    };\n  }\n})();\n\n\n/**\n * BaseBrush class\n * @class fabric.BaseBrush\n * @see {@link http://fabricjs.com/freedrawing|Freedrawing demo}\n */\nfabric.BaseBrush = fabric.util.createClass(/** @lends fabric.BaseBrush.prototype */ {\n\n  /**\n   * Color of a brush\n   * @type String\n   * @default\n   */\n  color: 'rgb(0, 0, 0)',\n\n  /**\n   * Width of a brush, has to be a Number, no string literals\n   * @type Number\n   * @default\n   */\n  width: 1,\n\n  /**\n   * Shadow object representing shadow of this shape.\n   * <b>Backwards incompatibility note:</b> This property replaces \"shadowColor\" (String), \"shadowOffsetX\" (Number),\n   * \"shadowOffsetY\" (Number) and \"shadowBlur\" (Number) since v1.2.12\n   * @type fabric.Shadow\n   * @default\n   */\n  shadow: null,\n\n  /**\n   * Line endings style of a brush (one of \"butt\", \"round\", \"square\")\n   * @type String\n   * @default\n   */\n  strokeLineCap: 'round',\n\n  /**\n   * Corner style of a brush (one of \"bevel\", \"round\", \"miter\")\n   * @type String\n   * @default\n   */\n  strokeLineJoin: 'round',\n\n  /**\n   * Maximum miter length (used for strokeLineJoin = \"miter\") of a brush's\n   * @type Number\n   * @default\n   */\n  strokeMiterLimit:         10,\n\n  /**\n   * Stroke Dash Array.\n   * @type Array\n   * @default\n   */\n  strokeDashArray: null,\n\n  /**\n   * Sets shadow of an object\n   * @param {Object|String} [options] Options object or string (e.g. \"2px 2px 10px rgba(0,0,0,0.2)\")\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  setShadow: function(options) {\n    this.shadow = new fabric.Shadow(options);\n    return this;\n  },\n\n  /**\n   * Sets brush styles\n   * @private\n   */\n  _setBrushStyles: function() {\n    var ctx = this.canvas.contextTop;\n    ctx.strokeStyle = this.color;\n    ctx.lineWidth = this.width;\n    ctx.lineCap = this.strokeLineCap;\n    ctx.miterLimit = this.strokeMiterLimit;\n    ctx.lineJoin = this.strokeLineJoin;\n    if (fabric.StaticCanvas.supports('setLineDash')) {\n      ctx.setLineDash(this.strokeDashArray || []);\n    }\n  },\n\n  /**\n   * Sets the transformation on given context\n   * @param {RenderingContext2d} ctx context to render on\n   * @private\n   */\n  _saveAndTransform: function(ctx) {\n    var v = this.canvas.viewportTransform;\n    ctx.save();\n    ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n  },\n\n  /**\n   * Sets brush shadow styles\n   * @private\n   */\n  _setShadow: function() {\n    if (!this.shadow) {\n      return;\n    }\n\n    var ctx = this.canvas.contextTop,\n        zoom = this.canvas.getZoom();\n\n    ctx.shadowColor = this.shadow.color;\n    ctx.shadowBlur = this.shadow.blur * zoom;\n    ctx.shadowOffsetX = this.shadow.offsetX * zoom;\n    ctx.shadowOffsetY = this.shadow.offsetY * zoom;\n  },\n\n  needsFullRender: function() {\n    var color = new fabric.Color(this.color);\n    return color.getAlpha() < 1 || !!this.shadow;\n  },\n\n  /**\n   * Removes brush shadow styles\n   * @private\n   */\n  _resetShadow: function() {\n    var ctx = this.canvas.contextTop;\n\n    ctx.shadowColor = '';\n    ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n  }\n});\n\n\n(function() {\n  /**\n   * PencilBrush class\n   * @class fabric.PencilBrush\n   * @extends fabric.BaseBrush\n   */\n  fabric.PencilBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.PencilBrush.prototype */ {\n\n    /**\n     * Discard points that are less than `decimate` pixel distant from each other\n     * @type Number\n     * @default 0.4\n     */\n    decimate: 0.4,\n\n    /**\n     * Constructor\n     * @param {fabric.Canvas} canvas\n     * @return {fabric.PencilBrush} Instance of a pencil brush\n     */\n    initialize: function(canvas) {\n      this.canvas = canvas;\n      this._points = [];\n    },\n\n    /**\n     * Invoked inside on mouse down and mouse move\n     * @param {Object} pointer\n     */\n    _drawSegment: function (ctx, p1, p2) {\n      var midPoint = p1.midPointFrom(p2);\n      ctx.quadraticCurveTo(p1.x, p1.y, midPoint.x, midPoint.y);\n      return midPoint;\n    },\n\n    /**\n     * Inovoked on mouse down\n     * @param {Object} pointer\n     */\n    onMouseDown: function(pointer, options) {\n      if (!this.canvas._isMainEvent(options.e)) {\n        return;\n      }\n      this._prepareForDrawing(pointer);\n      // capture coordinates immediately\n      // this allows to draw dots (when movement never occurs)\n      this._captureDrawingPath(pointer);\n      this._render();\n    },\n\n    /**\n     * Inovoked on mouse move\n     * @param {Object} pointer\n     */\n    onMouseMove: function(pointer, options) {\n      if (!this.canvas._isMainEvent(options.e)) {\n        return;\n      }\n      if (this._captureDrawingPath(pointer) && this._points.length > 1) {\n        if (this.needsFullRender()) {\n          // redraw curve\n          // clear top canvas\n          this.canvas.clearContext(this.canvas.contextTop);\n          this._render();\n        }\n        else {\n          var points = this._points, length = points.length, ctx = this.canvas.contextTop;\n          // draw the curve update\n          this._saveAndTransform(ctx);\n          if (this.oldEnd) {\n            ctx.beginPath();\n            ctx.moveTo(this.oldEnd.x, this.oldEnd.y);\n          }\n          this.oldEnd = this._drawSegment(ctx, points[length - 2], points[length - 1], true);\n          ctx.stroke();\n          ctx.restore();\n        }\n      }\n    },\n\n    /**\n     * Invoked on mouse up\n     */\n    onMouseUp: function(options) {\n      if (!this.canvas._isMainEvent(options.e)) {\n        return true;\n      }\n      this.oldEnd = undefined;\n      this._finalizeAndAddPath();\n      return false;\n    },\n\n    /**\n     * @private\n     * @param {Object} pointer Actual mouse position related to the canvas.\n     */\n    _prepareForDrawing: function(pointer) {\n\n      var p = new fabric.Point(pointer.x, pointer.y);\n\n      this._reset();\n      this._addPoint(p);\n      this.canvas.contextTop.moveTo(p.x, p.y);\n    },\n\n    /**\n     * @private\n     * @param {fabric.Point} point Point to be added to points array\n     */\n    _addPoint: function(point) {\n      if (this._points.length > 1 && point.eq(this._points[this._points.length - 1])) {\n        return false;\n      }\n      this._points.push(point);\n      return true;\n    },\n\n    /**\n     * Clear points array and set contextTop canvas style.\n     * @private\n     */\n    _reset: function() {\n      this._points = [];\n      this._setBrushStyles();\n      this._setShadow();\n    },\n\n    /**\n     * @private\n     * @param {Object} pointer Actual mouse position related to the canvas.\n     */\n    _captureDrawingPath: function(pointer) {\n      var pointerPoint = new fabric.Point(pointer.x, pointer.y);\n      return this._addPoint(pointerPoint);\n    },\n\n    /**\n     * Draw a smooth path on the topCanvas using quadraticCurveTo\n     * @private\n     */\n    _render: function() {\n      var ctx  = this.canvas.contextTop, i, len,\n          p1 = this._points[0],\n          p2 = this._points[1];\n\n      this._saveAndTransform(ctx);\n      ctx.beginPath();\n      //if we only have 2 points in the path and they are the same\n      //it means that the user only clicked the canvas without moving the mouse\n      //then we should be drawing a dot. A path isn't drawn between two identical dots\n      //that's why we set them apart a bit\n      if (this._points.length === 2 && p1.x === p2.x && p1.y === p2.y) {\n        var width = this.width / 1000;\n        p1 = new fabric.Point(p1.x, p1.y);\n        p2 = new fabric.Point(p2.x, p2.y);\n        p1.x -= width;\n        p2.x += width;\n      }\n      ctx.moveTo(p1.x, p1.y);\n\n      for (i = 1, len = this._points.length; i < len; i++) {\n        // we pick the point between pi + 1 & pi + 2 as the\n        // end point and p1 as our control point.\n        this._drawSegment(ctx, p1, p2);\n        p1 = this._points[i];\n        p2 = this._points[i + 1];\n      }\n      // Draw last line as a straight line while\n      // we wait for the next point to be able to calculate\n      // the bezier control point\n      ctx.lineTo(p1.x, p1.y);\n      ctx.stroke();\n      ctx.restore();\n    },\n\n    /**\n     * Converts points to SVG path\n     * @param {Array} points Array of points\n     * @return {String} SVG path\n     */\n    convertPointsToSVGPath: function(points) {\n      var path = [], i, width = this.width / 1000,\n          p1 = new fabric.Point(points[0].x, points[0].y),\n          p2 = new fabric.Point(points[1].x, points[1].y),\n          len = points.length, multSignX = 1, multSignY = 0, manyPoints = len > 2;\n\n      if (manyPoints) {\n        multSignX = points[2].x < p2.x ? -1 : points[2].x === p2.x ? 0 : 1;\n        multSignY = points[2].y < p2.y ? -1 : points[2].y === p2.y ? 0 : 1;\n      }\n      path.push('M ', p1.x - multSignX * width, ' ', p1.y - multSignY * width, ' ');\n      for (i = 1; i < len; i++) {\n        if (!p1.eq(p2)) {\n          var midPoint = p1.midPointFrom(p2);\n          // p1 is our bezier control point\n          // midpoint is our endpoint\n          // start point is p(i-1) value.\n          path.push('Q ', p1.x, ' ', p1.y, ' ', midPoint.x, ' ', midPoint.y, ' ');\n        }\n        p1 = points[i];\n        if ((i + 1) < points.length) {\n          p2 = points[i + 1];\n        }\n      }\n      if (manyPoints) {\n        multSignX = p1.x > points[i - 2].x ? 1 : p1.x === points[i - 2].x ? 0 : -1;\n        multSignY = p1.y > points[i - 2].y ? 1 : p1.y === points[i - 2].y ? 0 : -1;\n      }\n      path.push('L ', p1.x + multSignX * width, ' ', p1.y + multSignY * width);\n      return path;\n    },\n\n    /**\n     * Creates fabric.Path object to add on canvas\n     * @param {String} pathData Path data\n     * @return {fabric.Path} Path to add on canvas\n     */\n    createPath: function(pathData) {\n      var path = new fabric.Path(pathData, {\n        fill: null,\n        stroke: this.color,\n        strokeWidth: this.width,\n        strokeLineCap: this.strokeLineCap,\n        strokeMiterLimit: this.strokeMiterLimit,\n        strokeLineJoin: this.strokeLineJoin,\n        strokeDashArray: this.strokeDashArray,\n      });\n      if (this.shadow) {\n        this.shadow.affectStroke = true;\n        path.setShadow(this.shadow);\n      }\n\n      return path;\n    },\n\n    /**\n     * Decimate poins array with the decimate value\n     */\n    decimatePoints: function(points, distance) {\n      if (points.length <= 2) {\n        return points;\n      }\n      var zoom = this.canvas.getZoom(), adjustedDistance = Math.pow(distance / zoom, 2),\n          i, l = points.length - 1, lastPoint = points[0], newPoints = [lastPoint],\n          cDistance;\n      for (i = 1; i < l; i++) {\n        cDistance = Math.pow(lastPoint.x - points[i].x, 2) + Math.pow(lastPoint.y - points[i].y, 2);\n        if (cDistance >= adjustedDistance) {\n          lastPoint = points[i];\n          newPoints.push(lastPoint);\n        }\n      }\n      if (newPoints.length === 1) {\n        newPoints.push(new fabric.Point(newPoints[0].x, newPoints[0].y));\n      }\n      return newPoints;\n    },\n\n    /**\n     * On mouseup after drawing the path on contextTop canvas\n     * we use the points captured to create an new fabric path object\n     * and add it to the fabric canvas.\n     */\n    _finalizeAndAddPath: function() {\n      var ctx = this.canvas.contextTop;\n      ctx.closePath();\n      if (this.decimate) {\n        this._points = this.decimatePoints(this._points, this.decimate);\n      }\n      var pathData = this.convertPointsToSVGPath(this._points).join('');\n      if (pathData === 'M 0 0 Q 0 0 0 0 L 0 0') {\n        // do not create 0 width/height paths, as they are\n        // rendered inconsistently across browsers\n        // Firefox 4, for example, renders a dot,\n        // whereas Chrome 10 renders nothing\n        this.canvas.requestRenderAll();\n        return;\n      }\n\n      var path = this.createPath(pathData);\n      this.canvas.clearContext(this.canvas.contextTop);\n      this.canvas.add(path);\n      this.canvas.renderAll();\n      path.setCoords();\n      this._resetShadow();\n\n\n      // fire event 'path' created\n      this.canvas.fire('path:created', { path: path });\n    }\n  });\n})();\n\n\n/**\n * CircleBrush class\n * @class fabric.CircleBrush\n */\nfabric.CircleBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.CircleBrush.prototype */ {\n\n  /**\n   * Width of a brush\n   * @type Number\n   * @default\n   */\n  width: 10,\n\n  /**\n   * Constructor\n   * @param {fabric.Canvas} canvas\n   * @return {fabric.CircleBrush} Instance of a circle brush\n   */\n  initialize: function(canvas) {\n    this.canvas = canvas;\n    this.points = [];\n  },\n\n  /**\n   * Invoked inside on mouse down and mouse move\n   * @param {Object} pointer\n   */\n  drawDot: function(pointer) {\n    var point = this.addPoint(pointer),\n        ctx = this.canvas.contextTop;\n    this._saveAndTransform(ctx);\n    this.dot(ctx, point);\n    ctx.restore();\n  },\n\n  dot: function(ctx, point) {\n    ctx.fillStyle = point.fill;\n    ctx.beginPath();\n    ctx.arc(point.x, point.y, point.radius, 0, Math.PI * 2, false);\n    ctx.closePath();\n    ctx.fill();\n  },\n\n  /**\n   * Invoked on mouse down\n   */\n  onMouseDown: function(pointer) {\n    this.points.length = 0;\n    this.canvas.clearContext(this.canvas.contextTop);\n    this._setShadow();\n    this.drawDot(pointer);\n  },\n\n  /**\n   * Render the full state of the brush\n   * @private\n   */\n  _render: function() {\n    var ctx  = this.canvas.contextTop, i, len,\n        points = this.points;\n    this._saveAndTransform(ctx);\n    for (i = 0, len = points.length; i < len; i++) {\n      this.dot(ctx, points[i]);\n    }\n    ctx.restore();\n  },\n\n  /**\n   * Invoked on mouse move\n   * @param {Object} pointer\n   */\n  onMouseMove: function(pointer) {\n    if (this.needsFullRender()) {\n      this.canvas.clearContext(this.canvas.contextTop);\n      this.addPoint(pointer);\n      this._render();\n    }\n    else {\n      this.drawDot(pointer);\n    }\n  },\n\n  /**\n   * Invoked on mouse up\n   */\n  onMouseUp: function() {\n    var originalRenderOnAddRemove = this.canvas.renderOnAddRemove, i, len;\n    this.canvas.renderOnAddRemove = false;\n\n    var circles = [];\n\n    for (i = 0, len = this.points.length; i < len; i++) {\n      var point = this.points[i],\n          circle = new fabric.Circle({\n            radius: point.radius,\n            left: point.x,\n            top: point.y,\n            originX: 'center',\n            originY: 'center',\n            fill: point.fill\n          });\n\n      this.shadow && circle.setShadow(this.shadow);\n\n      circles.push(circle);\n    }\n    var group = new fabric.Group(circles);\n    group.canvas = this.canvas;\n\n    this.canvas.add(group);\n    this.canvas.fire('path:created', { path: group });\n\n    this.canvas.clearContext(this.canvas.contextTop);\n    this._resetShadow();\n    this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n    this.canvas.requestRenderAll();\n  },\n\n  /**\n   * @param {Object} pointer\n   * @return {fabric.Point} Just added pointer point\n   */\n  addPoint: function(pointer) {\n    var pointerPoint = new fabric.Point(pointer.x, pointer.y),\n\n        circleRadius = fabric.util.getRandomInt(\n          Math.max(0, this.width - 20), this.width + 20) / 2,\n\n        circleColor = new fabric.Color(this.color)\n          .setAlpha(fabric.util.getRandomInt(0, 100) / 100)\n          .toRgba();\n\n    pointerPoint.radius = circleRadius;\n    pointerPoint.fill = circleColor;\n\n    this.points.push(pointerPoint);\n\n    return pointerPoint;\n  }\n});\n\n\n/**\n * SprayBrush class\n * @class fabric.SprayBrush\n */\nfabric.SprayBrush = fabric.util.createClass( fabric.BaseBrush, /** @lends fabric.SprayBrush.prototype */ {\n\n  /**\n   * Width of a spray\n   * @type Number\n   * @default\n   */\n  width:              10,\n\n  /**\n   * Density of a spray (number of dots per chunk)\n   * @type Number\n   * @default\n   */\n  density:            20,\n\n  /**\n   * Width of spray dots\n   * @type Number\n   * @default\n   */\n  dotWidth:           1,\n\n  /**\n   * Width variance of spray dots\n   * @type Number\n   * @default\n   */\n  dotWidthVariance:   1,\n\n  /**\n   * Whether opacity of a dot should be random\n   * @type Boolean\n   * @default\n   */\n  randomOpacity:        false,\n\n  /**\n   * Whether overlapping dots (rectangles) should be removed (for performance reasons)\n   * @type Boolean\n   * @default\n   */\n  optimizeOverlapping:  true,\n\n  /**\n   * Constructor\n   * @param {fabric.Canvas} canvas\n   * @return {fabric.SprayBrush} Instance of a spray brush\n   */\n  initialize: function(canvas) {\n    this.canvas = canvas;\n    this.sprayChunks = [];\n  },\n\n  /**\n   * Invoked on mouse down\n   * @param {Object} pointer\n   */\n  onMouseDown: function(pointer) {\n    this.sprayChunks.length = 0;\n    this.canvas.clearContext(this.canvas.contextTop);\n    this._setShadow();\n\n    this.addSprayChunk(pointer);\n    this.render(this.sprayChunkPoints);\n  },\n\n  /**\n   * Invoked on mouse move\n   * @param {Object} pointer\n   */\n  onMouseMove: function(pointer) {\n    this.addSprayChunk(pointer);\n    this.render(this.sprayChunkPoints);\n  },\n\n  /**\n   * Invoked on mouse up\n   */\n  onMouseUp: function() {\n    var originalRenderOnAddRemove = this.canvas.renderOnAddRemove;\n    this.canvas.renderOnAddRemove = false;\n\n    var rects = [];\n\n    for (var i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n      var sprayChunk = this.sprayChunks[i];\n\n      for (var j = 0, jlen = sprayChunk.length; j < jlen; j++) {\n\n        var rect = new fabric.Rect({\n          width: sprayChunk[j].width,\n          height: sprayChunk[j].width,\n          left: sprayChunk[j].x + 1,\n          top: sprayChunk[j].y + 1,\n          originX: 'center',\n          originY: 'center',\n          fill: this.color\n        });\n        rects.push(rect);\n      }\n    }\n\n    if (this.optimizeOverlapping) {\n      rects = this._getOptimizedRects(rects);\n    }\n\n    var group = new fabric.Group(rects);\n    this.shadow && group.setShadow(this.shadow);\n    this.canvas.add(group);\n    this.canvas.fire('path:created', { path: group });\n\n    this.canvas.clearContext(this.canvas.contextTop);\n    this._resetShadow();\n    this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n    this.canvas.requestRenderAll();\n  },\n\n  /**\n   * @private\n   * @param {Array} rects\n   */\n  _getOptimizedRects: function(rects) {\n\n    // avoid creating duplicate rects at the same coordinates\n    var uniqueRects = { }, key, i, len;\n\n    for (i = 0, len = rects.length; i < len; i++) {\n      key = rects[i].left + '' + rects[i].top;\n      if (!uniqueRects[key]) {\n        uniqueRects[key] = rects[i];\n      }\n    }\n    var uniqueRectsArray = [];\n    for (key in uniqueRects) {\n      uniqueRectsArray.push(uniqueRects[key]);\n    }\n\n    return uniqueRectsArray;\n  },\n\n  /**\n   * Render new chunk of spray brush\n   */\n  render: function(sprayChunk) {\n    var ctx = this.canvas.contextTop, i, len;\n    ctx.fillStyle = this.color;\n\n    this._saveAndTransform(ctx);\n\n    for (i = 0, len = sprayChunk.length; i < len; i++) {\n      var point = sprayChunk[i];\n      if (typeof point.opacity !== 'undefined') {\n        ctx.globalAlpha = point.opacity;\n      }\n      ctx.fillRect(point.x, point.y, point.width, point.width);\n    }\n    ctx.restore();\n  },\n\n  /**\n   * Render all spray chunks\n   */\n  _render: function() {\n    var ctx = this.canvas.contextTop, i, ilen;\n    ctx.fillStyle = this.color;\n\n    this._saveAndTransform(ctx);\n\n    for (i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n      this.render(this.sprayChunks[i]);\n    }\n    ctx.restore();\n  },\n\n  /**\n   * @param {Object} pointer\n   */\n  addSprayChunk: function(pointer) {\n    this.sprayChunkPoints = [];\n\n    var x, y, width, radius = this.width / 2, i;\n\n    for (i = 0; i < this.density; i++) {\n\n      x = fabric.util.getRandomInt(pointer.x - radius, pointer.x + radius);\n      y = fabric.util.getRandomInt(pointer.y - radius, pointer.y + radius);\n\n      if (this.dotWidthVariance) {\n        width = fabric.util.getRandomInt(\n          // bottom clamp width to 1\n          Math.max(1, this.dotWidth - this.dotWidthVariance),\n          this.dotWidth + this.dotWidthVariance);\n      }\n      else {\n        width = this.dotWidth;\n      }\n\n      var point = new fabric.Point(x, y);\n      point.width = width;\n\n      if (this.randomOpacity) {\n        point.opacity = fabric.util.getRandomInt(0, 100) / 100;\n      }\n\n      this.sprayChunkPoints.push(point);\n    }\n\n    this.sprayChunks.push(this.sprayChunkPoints);\n  }\n});\n\n\n/**\n * PatternBrush class\n * @class fabric.PatternBrush\n * @extends fabric.BaseBrush\n */\nfabric.PatternBrush = fabric.util.createClass(fabric.PencilBrush, /** @lends fabric.PatternBrush.prototype */ {\n\n  getPatternSrc: function() {\n\n    var dotWidth = 20,\n        dotDistance = 5,\n        patternCanvas = fabric.util.createCanvasElement(),\n        patternCtx = patternCanvas.getContext('2d');\n\n    patternCanvas.width = patternCanvas.height = dotWidth + dotDistance;\n\n    patternCtx.fillStyle = this.color;\n    patternCtx.beginPath();\n    patternCtx.arc(dotWidth / 2, dotWidth / 2, dotWidth / 2, 0, Math.PI * 2, false);\n    patternCtx.closePath();\n    patternCtx.fill();\n\n    return patternCanvas;\n  },\n\n  getPatternSrcFunction: function() {\n    return String(this.getPatternSrc).replace('this.color', '\"' + this.color + '\"');\n  },\n\n  /**\n   * Creates \"pattern\" instance property\n   */\n  getPattern: function() {\n    return this.canvas.contextTop.createPattern(this.source || this.getPatternSrc(), 'repeat');\n  },\n\n  /**\n   * Sets brush styles\n   */\n  _setBrushStyles: function() {\n    this.callSuper('_setBrushStyles');\n    this.canvas.contextTop.strokeStyle = this.getPattern();\n  },\n\n  /**\n   * Creates path\n   */\n  createPath: function(pathData) {\n    var path = this.callSuper('createPath', pathData),\n        topLeft = path._getLeftTopCoords().scalarAdd(path.strokeWidth / 2);\n\n    path.stroke = new fabric.Pattern({\n      source: this.source || this.getPatternSrcFunction(),\n      offsetX: -topLeft.x,\n      offsetY: -topLeft.y\n    });\n    return path;\n  }\n});\n\n\n(function() {\n\n  var getPointer = fabric.util.getPointer,\n      degreesToRadians = fabric.util.degreesToRadians,\n      radiansToDegrees = fabric.util.radiansToDegrees,\n      atan2 = Math.atan2,\n      abs = Math.abs,\n      supportLineDash = fabric.StaticCanvas.supports('setLineDash'),\n\n      STROKE_OFFSET = 0.5;\n\n  /**\n   * Canvas class\n   * @class fabric.Canvas\n   * @extends fabric.StaticCanvas\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#canvas}\n   * @see {@link fabric.Canvas#initialize} for constructor definition\n   *\n   * @fires object:modified\n   * @fires object:rotated\n   * @fires object:scaled\n   * @fires object:moved\n   * @fires object:skewed\n   * @fires object:rotating\n   * @fires object:scaling\n   * @fires object:moving\n   * @fires object:skewing\n   * @fires object:selected this event is deprecated. use selection:created\n   *\n   * @fires before:transform\n   * @fires before:selection:cleared\n   * @fires selection:cleared\n   * @fires selection:updated\n   * @fires selection:created\n   *\n   * @fires path:created\n   * @fires mouse:down\n   * @fires mouse:move\n   * @fires mouse:up\n   * @fires mouse:down:before\n   * @fires mouse:move:before\n   * @fires mouse:up:before\n   * @fires mouse:over\n   * @fires mouse:out\n   * @fires mouse:dblclick\n   *\n   * @fires dragover\n   * @fires dragenter\n   * @fires dragleave\n   * @fires drop\n   *\n   */\n  fabric.Canvas = fabric.util.createClass(fabric.StaticCanvas, /** @lends fabric.Canvas.prototype */ {\n\n    /**\n     * Constructor\n     * @param {HTMLElement | String} el &lt;canvas> element to initialize instance on\n     * @param {Object} [options] Options object\n     * @return {Object} thisArg\n     */\n    initialize: function(el, options) {\n      options || (options = { });\n      this.renderAndResetBound = this.renderAndReset.bind(this);\n      this.requestRenderAllBound = this.requestRenderAll.bind(this);\n      this._initStatic(el, options);\n      this._initInteractive();\n      this._createCacheCanvas();\n    },\n\n    /**\n     * When true, objects can be transformed by one side (unproportionally)\n     * @type Boolean\n     * @default\n     */\n    uniScaleTransform:      false,\n\n    /**\n     * Indicates which key enable unproportional scaling\n     * values: 'altKey', 'shiftKey', 'ctrlKey'.\n     * If `null` or 'none' or any other string that is not a modifier key\n     * feature is disabled feature disabled.\n     * @since 1.6.2\n     * @type String\n     * @default\n     */\n    uniScaleKey:           'shiftKey',\n\n    /**\n     * When true, objects use center point as the origin of scale transformation.\n     * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n     * @since 1.3.4\n     * @type Boolean\n     * @default\n     */\n    centeredScaling:        false,\n\n    /**\n     * When true, objects use center point as the origin of rotate transformation.\n     * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n     * @since 1.3.4\n     * @type Boolean\n     * @default\n     */\n    centeredRotation:       false,\n\n    /**\n     * Indicates which key enable centered Transform\n     * values: 'altKey', 'shiftKey', 'ctrlKey'.\n     * If `null` or 'none' or any other string that is not a modifier key\n     * feature is disabled feature disabled.\n     * @since 1.6.2\n     * @type String\n     * @default\n     */\n    centeredKey:           'altKey',\n\n    /**\n     * Indicates which key enable alternate action on corner\n     * values: 'altKey', 'shiftKey', 'ctrlKey'.\n     * If `null` or 'none' or any other string that is not a modifier key\n     * feature is disabled feature disabled.\n     * @since 1.6.2\n     * @type String\n     * @default\n     */\n    altActionKey:           'shiftKey',\n\n    /**\n     * Indicates that canvas is interactive. This property should not be changed.\n     * @type Boolean\n     * @default\n     */\n    interactive:            true,\n\n    /**\n     * Indicates whether group selection should be enabled\n     * @type Boolean\n     * @default\n     */\n    selection:              true,\n\n    /**\n     * Indicates which key or keys enable multiple click selection\n     * Pass value as a string or array of strings\n     * values: 'altKey', 'shiftKey', 'ctrlKey'.\n     * If `null` or empty or containing any other string that is not a modifier key\n     * feature is disabled.\n     * @since 1.6.2\n     * @type String|Array\n     * @default\n     */\n    selectionKey:           'shiftKey',\n\n    /**\n     * Indicates which key enable alternative selection\n     * in case of target overlapping with active object\n     * values: 'altKey', 'shiftKey', 'ctrlKey'.\n     * For a series of reason that come from the general expectations on how\n     * things should work, this feature works only for preserveObjectStacking true.\n     * If `null` or 'none' or any other string that is not a modifier key\n     * feature is disabled.\n     * @since 1.6.5\n     * @type null|String\n     * @default\n     */\n    altSelectionKey:           null,\n\n    /**\n     * Color of selection\n     * @type String\n     * @default\n     */\n    selectionColor:         'rgba(100, 100, 255, 0.3)', // blue\n\n    /**\n     * Default dash array pattern\n     * If not empty the selection border is dashed\n     * @type Array\n     */\n    selectionDashArray:     [],\n\n    /**\n     * Color of the border of selection (usually slightly darker than color of selection itself)\n     * @type String\n     * @default\n     */\n    selectionBorderColor:   'rgba(255, 255, 255, 0.3)',\n\n    /**\n     * Width of a line used in object/group selection\n     * @type Number\n     * @default\n     */\n    selectionLineWidth:     1,\n\n    /**\n     * Select only shapes that are fully contained in the dragged selection rectangle.\n     * @type Boolean\n     * @default\n     */\n    selectionFullyContained: false,\n\n    /**\n     * Default cursor value used when hovering over an object on canvas\n     * @type String\n     * @default\n     */\n    hoverCursor:            'move',\n\n    /**\n     * Default cursor value used when moving an object on canvas\n     * @type String\n     * @default\n     */\n    moveCursor:             'move',\n\n    /**\n     * Default cursor value used for the entire canvas\n     * @type String\n     * @default\n     */\n    defaultCursor:          'default',\n\n    /**\n     * Cursor value used during free drawing\n     * @type String\n     * @default\n     */\n    freeDrawingCursor:      'crosshair',\n\n    /**\n     * Cursor value used for rotation point\n     * @type String\n     * @default\n     */\n    rotationCursor:         'crosshair',\n\n    /**\n     * Cursor value used for disabled elements ( corners with disabled action )\n     * @type String\n     * @since 2.0.0\n     * @default\n     */\n    notAllowedCursor:         'not-allowed',\n\n    /**\n     * Default element class that's given to wrapper (div) element of canvas\n     * @type String\n     * @default\n     */\n    containerClass:         'canvas-container',\n\n    /**\n     * When true, object detection happens on per-pixel basis rather than on per-bounding-box\n     * @type Boolean\n     * @default\n     */\n    perPixelTargetFind:     false,\n\n    /**\n     * Number of pixels around target pixel to tolerate (consider active) during object detection\n     * @type Number\n     * @default\n     */\n    targetFindTolerance:    0,\n\n    /**\n     * When true, target detection is skipped when hovering over canvas. This can be used to improve performance.\n     * @type Boolean\n     * @default\n     */\n    skipTargetFind:         false,\n\n    /**\n     * When true, mouse events on canvas (mousedown/mousemove/mouseup) result in free drawing.\n     * After mousedown, mousemove creates a shape,\n     * and then mouseup finalizes it and adds an instance of `fabric.Path` onto canvas.\n     * @tutorial {@link http://fabricjs.com/fabric-intro-part-4#free_drawing}\n     * @type Boolean\n     * @default\n     */\n    isDrawingMode:          false,\n\n    /**\n     * Indicates whether objects should remain in current stack position when selected.\n     * When false objects are brought to top and rendered as part of the selection group\n     * @type Boolean\n     * @default\n     */\n    preserveObjectStacking: false,\n\n    /**\n     * Indicates the angle that an object will lock to while rotating.\n     * @type Number\n     * @since 1.6.7\n     * @default\n     */\n    snapAngle: 0,\n\n    /**\n     * Indicates the distance from the snapAngle the rotation will lock to the snapAngle.\n     * When `null`, the snapThreshold will default to the snapAngle.\n     * @type null|Number\n     * @since 1.6.7\n     * @default\n     */\n    snapThreshold: null,\n\n    /**\n     * Indicates if the right click on canvas can output the context menu or not\n     * @type Boolean\n     * @since 1.6.5\n     * @default\n     */\n    stopContextMenu: false,\n\n    /**\n     * Indicates if the canvas can fire right click events\n     * @type Boolean\n     * @since 1.6.5\n     * @default\n     */\n    fireRightClick: false,\n\n    /**\n     * Indicates if the canvas can fire middle click events\n     * @type Boolean\n     * @since 1.7.8\n     * @default\n     */\n    fireMiddleClick: false,\n\n    /**\n     * @private\n     */\n    _initInteractive: function() {\n      this._currentTransform = null;\n      this._groupSelector = null;\n      this._initWrapperElement();\n      this._createUpperCanvas();\n      this._initEventListeners();\n\n      this._initRetinaScaling();\n\n      this.freeDrawingBrush = fabric.PencilBrush && new fabric.PencilBrush(this);\n\n      this.calcOffset();\n    },\n\n    /**\n     * Divides objects in two groups, one to render immediately\n     * and one to render as activeGroup.\n     * @return {Array} objects to render immediately and pushes the other in the activeGroup.\n     */\n    _chooseObjectsToRender: function() {\n      var activeObjects = this.getActiveObjects(),\n          object, objsToRender, activeGroupObjects;\n\n      if (activeObjects.length > 0 && !this.preserveObjectStacking) {\n        objsToRender = [];\n        activeGroupObjects = [];\n        for (var i = 0, length = this._objects.length; i < length; i++) {\n          object = this._objects[i];\n          if (activeObjects.indexOf(object) === -1 ) {\n            objsToRender.push(object);\n          }\n          else {\n            activeGroupObjects.push(object);\n          }\n        }\n        if (activeObjects.length > 1) {\n          this._activeObject._objects = activeGroupObjects;\n        }\n        objsToRender.push.apply(objsToRender, activeGroupObjects);\n      }\n      else {\n        objsToRender = this._objects;\n      }\n      return objsToRender;\n    },\n\n    /**\n     * Renders both the top canvas and the secondary container canvas.\n     * @return {fabric.Canvas} instance\n     * @chainable\n     */\n    renderAll: function () {\n      if (this.contextTopDirty && !this._groupSelector && !this.isDrawingMode) {\n        this.clearContext(this.contextTop);\n        this.contextTopDirty = false;\n      }\n      if (this.hasLostContext) {\n        this.renderTopLayer(this.contextTop);\n      }\n      var canvasToDrawOn = this.contextContainer;\n      this.renderCanvas(canvasToDrawOn, this._chooseObjectsToRender());\n      return this;\n    },\n\n    renderTopLayer: function(ctx) {\n      ctx.save();\n      if (this.isDrawingMode && this._isCurrentlyDrawing) {\n        this.freeDrawingBrush && this.freeDrawingBrush._render();\n        this.contextTopDirty = true;\n      }\n      // we render the top context - last object\n      if (this.selection && this._groupSelector) {\n        this._drawSelection(ctx);\n        this.contextTopDirty = true;\n      }\n      ctx.restore();\n    },\n\n    /**\n     * Method to render only the top canvas.\n     * Also used to render the group selection box.\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    renderTop: function () {\n      var ctx = this.contextTop;\n      this.clearContext(ctx);\n      this.renderTopLayer(ctx);\n      this.fire('after:render');\n      return this;\n    },\n\n    /**\n     * Resets the current transform to its original values and chooses the type of resizing based on the event\n     * @private\n     */\n    _resetCurrentTransform: function() {\n      var t = this._currentTransform;\n\n      t.target.set({\n        scaleX: t.original.scaleX,\n        scaleY: t.original.scaleY,\n        skewX: t.original.skewX,\n        skewY: t.original.skewY,\n        left: t.original.left,\n        top: t.original.top\n      });\n\n      if (this._shouldCenterTransform(t.target)) {\n        if (t.originX !== 'center') {\n          if (t.originX === 'right') {\n            t.mouseXSign = -1;\n          }\n          else {\n            t.mouseXSign = 1;\n          }\n        }\n        if (t.originY !== 'center') {\n          if (t.originY === 'bottom') {\n            t.mouseYSign = -1;\n          }\n          else {\n            t.mouseYSign = 1;\n          }\n        }\n\n        t.originX = 'center';\n        t.originY = 'center';\n      }\n      else {\n        t.originX = t.original.originX;\n        t.originY = t.original.originY;\n      }\n    },\n\n    /**\n     * Checks if point is contained within an area of given object\n     * @param {Event} e Event object\n     * @param {fabric.Object} target Object to test against\n     * @param {Object} [point] x,y object of point coordinates we want to check.\n     * @return {Boolean} true if point is contained within an area of given object\n     */\n    containsPoint: function (e, target, point) {\n      var ignoreZoom = true,\n          pointer = point || this.getPointer(e, ignoreZoom),\n          xy;\n\n      if (target.group && target.group === this._activeObject && target.group.type === 'activeSelection') {\n        xy = this._normalizePointer(target.group, pointer);\n      }\n      else {\n        xy = { x: pointer.x, y: pointer.y };\n      }\n      // http://www.geog.ubc.ca/courses/klink/gis.notes/ncgia/u32.html\n      // http://idav.ucdavis.edu/~okreylos/TAship/Spring2000/PointInPolygon.html\n      return (target.containsPoint(xy) || target._findTargetCorner(pointer));\n    },\n\n    /**\n     * @private\n     */\n    _normalizePointer: function (object, pointer) {\n      var m = object.calcTransformMatrix(),\n          invertedM = fabric.util.invertTransform(m),\n          vptPointer = this.restorePointerVpt(pointer);\n      return fabric.util.transformPoint(vptPointer, invertedM);\n    },\n\n    /**\n     * Returns true if object is transparent at a certain location\n     * @param {fabric.Object} target Object to check\n     * @param {Number} x Left coordinate\n     * @param {Number} y Top coordinate\n     * @return {Boolean}\n     */\n    isTargetTransparent: function (target, x, y) {\n      // in case the target is the activeObject, we cannot execute this optimization\n      // because we need to draw controls too.\n      if (target.shouldCache() && target._cacheCanvas && target !== this._activeObject) {\n        var normalizedPointer = this._normalizePointer(target, {x: x, y: y}),\n            targetRelativeX = Math.max(target.cacheTranslationX + (normalizedPointer.x * target.zoomX), 0),\n            targetRelativeY = Math.max(target.cacheTranslationY + (normalizedPointer.y * target.zoomY), 0);\n\n        var isTransparent = fabric.util.isTransparent(\n          target._cacheContext, Math.round(targetRelativeX), Math.round(targetRelativeY), this.targetFindTolerance);\n\n        return isTransparent;\n      }\n\n      var ctx = this.contextCache,\n          originalColor = target.selectionBackgroundColor, v = this.viewportTransform;\n\n      target.selectionBackgroundColor = '';\n\n      this.clearContext(ctx);\n\n      ctx.save();\n      ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n      target.render(ctx);\n      ctx.restore();\n\n      target === this._activeObject && target._renderControls(ctx, {\n        hasBorders: false,\n        transparentCorners: false\n      }, {\n        hasBorders: false,\n      });\n\n      target.selectionBackgroundColor = originalColor;\n\n      var isTransparent = fabric.util.isTransparent(\n        ctx, x, y, this.targetFindTolerance);\n\n      return isTransparent;\n    },\n\n    /**\n     * takes an event and determins if selection key has been pressed\n     * @private\n     * @param {Event} e Event object\n     */\n    _isSelectionKeyPressed: function(e) {\n      var selectionKeyPressed = false;\n\n      if (Object.prototype.toString.call(this.selectionKey) === '[object Array]') {\n        selectionKeyPressed = !!this.selectionKey.find(function(key) { return e[key] === true; });\n      }\n      else {\n        selectionKeyPressed = e[this.selectionKey];\n      }\n\n      return selectionKeyPressed;\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {fabric.Object} target\n     */\n    _shouldClearSelection: function (e, target) {\n      var activeObjects = this.getActiveObjects(),\n          activeObject = this._activeObject;\n\n      return (\n        !target\n        ||\n        (target &&\n          activeObject &&\n          activeObjects.length > 1 &&\n          activeObjects.indexOf(target) === -1 &&\n          activeObject !== target &&\n          !this._isSelectionKeyPressed(e))\n        ||\n        (target && !target.evented)\n        ||\n        (target &&\n          !target.selectable &&\n          activeObject &&\n          activeObject !== target)\n      );\n    },\n\n    /**\n     * centeredScaling from object can't override centeredScaling from canvas.\n     * this should be fixed, since object setting should take precedence over canvas.\n     * @private\n     * @param {fabric.Object} target\n     */\n    _shouldCenterTransform: function (target) {\n      if (!target) {\n        return;\n      }\n\n      var t = this._currentTransform,\n          centerTransform;\n\n      if (t.action === 'scale' || t.action === 'scaleX' || t.action === 'scaleY') {\n        centerTransform = this.centeredScaling || target.centeredScaling;\n      }\n      else if (t.action === 'rotate') {\n        centerTransform = this.centeredRotation || target.centeredRotation;\n      }\n\n      return centerTransform ? !t.altKey : t.altKey;\n    },\n\n    /**\n     * @private\n     */\n    _getOriginFromCorner: function(target, corner) {\n      var origin = {\n        x: target.originX,\n        y: target.originY\n      };\n\n      if (corner === 'ml' || corner === 'tl' || corner === 'bl') {\n        origin.x = 'right';\n      }\n      else if (corner === 'mr' || corner === 'tr' || corner === 'br') {\n        origin.x = 'left';\n      }\n\n      if (corner === 'tl' || corner === 'mt' || corner === 'tr') {\n        origin.y = 'bottom';\n      }\n      else if (corner === 'bl' || corner === 'mb' || corner === 'br') {\n        origin.y = 'top';\n      }\n\n      return origin;\n    },\n\n    /**\n     * @private\n     * @param {Boolean} alreadySelected true if target is already selected\n     * @param {String} corner a string representing the corner ml, mr, tl ...\n     * @param {Event} e Event object\n     * @param {fabric.Object} [target] inserted back to help overriding. Unused\n     */\n    _getActionFromCorner: function(alreadySelected, corner, e /* target */) {\n      if (!corner || !alreadySelected) {\n        return 'drag';\n      }\n\n      switch (corner) {\n        case 'mtr':\n          return 'rotate';\n        case 'ml':\n        case 'mr':\n          return e[this.altActionKey] ? 'skewY' : 'scaleX';\n        case 'mt':\n        case 'mb':\n          return e[this.altActionKey] ? 'skewX' : 'scaleY';\n        default:\n          return 'scale';\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {fabric.Object} target\n     */\n    _setupCurrentTransform: function (e, target, alreadySelected) {\n      if (!target) {\n        return;\n      }\n\n      var pointer = this.getPointer(e),\n          corner = target._findTargetCorner(this.getPointer(e, true)),\n          action = this._getActionFromCorner(alreadySelected, corner, e, target),\n          origin = this._getOriginFromCorner(target, corner);\n\n      this._currentTransform = {\n        target: target,\n        action: action,\n        corner: corner,\n        scaleX: target.scaleX,\n        scaleY: target.scaleY,\n        skewX: target.skewX,\n        skewY: target.skewY,\n        // used by transation\n        offsetX: pointer.x - target.left,\n        offsetY: pointer.y - target.top,\n        originX: origin.x,\n        originY: origin.y,\n        ex: pointer.x,\n        ey: pointer.y,\n        lastX: pointer.x,\n        lastY: pointer.y,\n        // unsure they are usefull anymore.\n        // left: target.left,\n        // top: target.top,\n        theta: degreesToRadians(target.angle),\n        // end of unsure\n        width: target.width * target.scaleX,\n        mouseXSign: 1,\n        mouseYSign: 1,\n        shiftKey: e.shiftKey,\n        altKey: e[this.centeredKey],\n        original: fabric.util.saveObjectTransform(target),\n      };\n\n      this._currentTransform.original.originX = origin.x;\n      this._currentTransform.original.originY = origin.y;\n\n      this._resetCurrentTransform();\n      this._beforeTransform(e);\n    },\n\n    /**\n     * Translates object by \"setting\" its left/top\n     * @private\n     * @param {Number} x pointer's x coordinate\n     * @param {Number} y pointer's y coordinate\n     * @return {Boolean} true if the translation occurred\n     */\n    _translateObject: function (x, y) {\n      var transform = this._currentTransform,\n          target = transform.target,\n          newLeft = x - transform.offsetX,\n          newTop = y - transform.offsetY,\n          moveX = !target.get('lockMovementX') && target.left !== newLeft,\n          moveY = !target.get('lockMovementY') && target.top !== newTop;\n\n      moveX && target.set('left', newLeft);\n      moveY && target.set('top', newTop);\n      return moveX || moveY;\n    },\n\n    /**\n     * Check if we are increasing a positive skew or lower it,\n     * checking mouse direction and pressed corner.\n     * @private\n     */\n    _changeSkewTransformOrigin: function(mouseMove, t, by) {\n      var property = 'originX', origins = { 0: 'center' },\n          skew = t.target.skewX, originA = 'left', originB = 'right',\n          corner = t.corner === 'mt' || t.corner === 'ml' ? 1 : -1,\n          flipSign = 1;\n\n      mouseMove = mouseMove > 0 ? 1 : -1;\n      if (by === 'y') {\n        skew = t.target.skewY;\n        originA = 'top';\n        originB = 'bottom';\n        property = 'originY';\n      }\n      origins[-1] = originA;\n      origins[1] = originB;\n\n      t.target.flipX && (flipSign *= -1);\n      t.target.flipY && (flipSign *= -1);\n\n      if (skew === 0) {\n        t.skewSign = -corner * mouseMove * flipSign;\n        t[property] = origins[-mouseMove];\n      }\n      else {\n        skew = skew > 0 ? 1 : -1;\n        t.skewSign = skew;\n        t[property] = origins[skew * corner * flipSign];\n      }\n    },\n\n    /**\n     * Skew object by mouse events\n     * @private\n     * @param {Number} x pointer's x coordinate\n     * @param {Number} y pointer's y coordinate\n     * @param {String} by Either 'x' or 'y'\n     * @return {Boolean} true if the skewing occurred\n     */\n    _skewObject: function (x, y, by) {\n      var t = this._currentTransform,\n          target = t.target, skewed = false,\n          lockSkewingX = target.get('lockSkewingX'),\n          lockSkewingY = target.get('lockSkewingY');\n\n      if ((lockSkewingX && by === 'x') || (lockSkewingY && by === 'y')) {\n        return false;\n      }\n\n      // Get the constraint point\n      var center = target.getCenterPoint(),\n          actualMouseByCenter = target.toLocalPoint(new fabric.Point(x, y), 'center', 'center')[by],\n          lastMouseByCenter = target.toLocalPoint(new fabric.Point(t.lastX, t.lastY), 'center', 'center')[by],\n          actualMouseByOrigin, constraintPosition, dim = target._getTransformedDimensions();\n\n      this._changeSkewTransformOrigin(actualMouseByCenter - lastMouseByCenter, t, by);\n      actualMouseByOrigin = target.toLocalPoint(new fabric.Point(x, y), t.originX, t.originY)[by];\n      constraintPosition = target.translateToOriginPoint(center, t.originX, t.originY);\n      // Actually skew the object\n      skewed = this._setObjectSkew(actualMouseByOrigin, t, by, dim);\n      t.lastX = x;\n      t.lastY = y;\n      // Make sure the constraints apply\n      target.setPositionByOrigin(constraintPosition, t.originX, t.originY);\n      return skewed;\n    },\n\n    /**\n     * Set object skew\n     * @private\n     * @return {Boolean} true if the skewing occurred\n     */\n    _setObjectSkew: function(localMouse, transform, by, _dim) {\n      var target = transform.target, newValue, skewed = false,\n          skewSign = transform.skewSign, newDim, dimNoSkew,\n          otherBy, _otherBy, _by, newDimMouse, skewX, skewY;\n\n      if (by === 'x') {\n        otherBy = 'y';\n        _otherBy = 'Y';\n        _by = 'X';\n        skewX = 0;\n        skewY = target.skewY;\n      }\n      else {\n        otherBy = 'x';\n        _otherBy = 'X';\n        _by = 'Y';\n        skewX = target.skewX;\n        skewY = 0;\n      }\n\n      dimNoSkew = target._getTransformedDimensions(skewX, skewY);\n      newDimMouse = 2 * Math.abs(localMouse) - dimNoSkew[by];\n      if (newDimMouse <= 2) {\n        newValue = 0;\n      }\n      else {\n        newValue = skewSign * Math.atan((newDimMouse / target['scale' + _by]) /\n                                        (dimNoSkew[otherBy] / target['scale' + _otherBy]));\n        newValue = fabric.util.radiansToDegrees(newValue);\n      }\n      skewed = target['skew' + _by] !== newValue;\n      target.set('skew' + _by, newValue);\n      if (target['skew' + _otherBy] !== 0) {\n        newDim = target._getTransformedDimensions();\n        newValue = (_dim[otherBy] / newDim[otherBy]) * target['scale' + _otherBy];\n        target.set('scale' + _otherBy, newValue);\n      }\n      return skewed;\n    },\n\n    /**\n     * Scales object by invoking its scaleX/scaleY methods\n     * @private\n     * @param {Number} x pointer's x coordinate\n     * @param {Number} y pointer's y coordinate\n     * @param {String} by Either 'x' or 'y' - specifies dimension constraint by which to scale an object.\n     *                    When not provided, an object is scaled by both dimensions equally\n     * @return {Boolean} true if the scaling occurred\n     */\n    _scaleObject: function (x, y, by) {\n      var t = this._currentTransform,\n          target = t.target,\n          lockScalingX = target.lockScalingX,\n          lockScalingY = target.lockScalingY,\n          lockScalingFlip = target.lockScalingFlip;\n\n      if (lockScalingX && lockScalingY) {\n        return false;\n      }\n\n      // Get the constraint point\n      var constraintPosition = target.translateToOriginPoint(target.getCenterPoint(), t.originX, t.originY),\n          localMouse = target.toLocalPoint(new fabric.Point(x, y), t.originX, t.originY),\n          dim = target._getTransformedDimensions(), scaled = false;\n\n      this._setLocalMouse(localMouse, t);\n\n      // Actually scale the object\n      scaled = this._setObjectScale(localMouse, t, lockScalingX, lockScalingY, by, lockScalingFlip, dim);\n\n      // Make sure the constraints apply\n      target.setPositionByOrigin(constraintPosition, t.originX, t.originY);\n      return scaled;\n    },\n\n    /**\n     * @private\n     * @return {Boolean} true if the scaling occurred\n     */\n    _setObjectScale: function(localMouse, transform, lockScalingX, lockScalingY, by, lockScalingFlip, _dim) {\n      var target = transform.target, forbidScalingX = false, forbidScalingY = false, scaled = false,\n          scaleX = localMouse.x * target.scaleX / _dim.x,\n          scaleY = localMouse.y * target.scaleY / _dim.y,\n          changeX = target.scaleX !== scaleX,\n          changeY = target.scaleY !== scaleY;\n\n      transform.newScaleX = scaleX;\n      transform.newScaleY = scaleY;\n      if (by === 'x' && target instanceof fabric.Textbox) {\n        var w = target.width * (localMouse.x / _dim.x);\n        if (w >= target.getMinWidth()) {\n          scaled = w !== target.width;\n          target.set('width', w);\n          return scaled;\n        }\n        return false;\n      }\n\n      if (lockScalingFlip && scaleX <= 0 && scaleX < target.scaleX) {\n        forbidScalingX = true;\n        localMouse.x = 0;\n      }\n\n      if (lockScalingFlip && scaleY <= 0 && scaleY < target.scaleY) {\n        forbidScalingY = true;\n        localMouse.y = 0;\n      }\n\n      if (by === 'equally' && !lockScalingX && !lockScalingY) {\n        scaled = this._scaleObjectEqually(localMouse, target, transform, _dim);\n      }\n      else if (!by) {\n        forbidScalingX || lockScalingX || (target.set('scaleX', scaleX) && (scaled = scaled || changeX));\n        forbidScalingY || lockScalingY || (target.set('scaleY', scaleY) && (scaled = scaled || changeY));\n      }\n      else if (by === 'x' && !target.get('lockUniScaling')) {\n        forbidScalingX || lockScalingX || (target.set('scaleX', scaleX) && (scaled = changeX));\n      }\n      else if (by === 'y' && !target.get('lockUniScaling')) {\n        forbidScalingY || lockScalingY || (target.set('scaleY', scaleY) && (scaled = changeY));\n      }\n      forbidScalingX || forbidScalingY || this._flipObject(transform, by);\n      return scaled;\n    },\n\n    /**\n     * @private\n     * @return {Boolean} true if the scaling occurred\n     */\n    _scaleObjectEqually: function(localMouse, target, transform, _dim) {\n\n      var dist = localMouse.y + localMouse.x,\n          lastDist = _dim.y * transform.original.scaleY / target.scaleY +\n                     _dim.x * transform.original.scaleX / target.scaleX,\n          scaled, signX = localMouse.x < 0 ? -1 : 1,\n          signY = localMouse.y < 0 ? -1 : 1, newScaleX, newScaleY;\n\n      // We use transform.scaleX/Y instead of target.scaleX/Y\n      // because the object may have a min scale and we'll loose the proportions\n      newScaleX = signX * Math.abs(transform.original.scaleX * dist / lastDist);\n      newScaleY = signY * Math.abs(transform.original.scaleY * dist / lastDist);\n      scaled = newScaleX !== target.scaleX || newScaleY !== target.scaleY;\n      target.set('scaleX', newScaleX);\n      target.set('scaleY', newScaleY);\n      return scaled;\n    },\n\n    /**\n     * @private\n     */\n    _flipObject: function(transform, by) {\n      if (transform.newScaleX < 0 && by !== 'y') {\n        if (transform.originX === 'left') {\n          transform.originX = 'right';\n        }\n        else if (transform.originX === 'right') {\n          transform.originX = 'left';\n        }\n      }\n\n      if (transform.newScaleY < 0 && by !== 'x') {\n        if (transform.originY === 'top') {\n          transform.originY = 'bottom';\n        }\n        else if (transform.originY === 'bottom') {\n          transform.originY = 'top';\n        }\n      }\n    },\n\n    /**\n     * @private\n     */\n    _setLocalMouse: function(localMouse, t) {\n      var target = t.target, zoom = this.getZoom(),\n          padding = target.padding / zoom;\n\n      if (t.originX === 'right') {\n        localMouse.x *= -1;\n      }\n      else if (t.originX === 'center') {\n        localMouse.x *= t.mouseXSign * 2;\n        if (localMouse.x < 0) {\n          t.mouseXSign = -t.mouseXSign;\n        }\n      }\n\n      if (t.originY === 'bottom') {\n        localMouse.y *= -1;\n      }\n      else if (t.originY === 'center') {\n        localMouse.y *= t.mouseYSign * 2;\n        if (localMouse.y < 0) {\n          t.mouseYSign = -t.mouseYSign;\n        }\n      }\n\n      // adjust the mouse coordinates when dealing with padding\n      if (abs(localMouse.x) > padding) {\n        if (localMouse.x < 0) {\n          localMouse.x += padding;\n        }\n        else {\n          localMouse.x -= padding;\n        }\n      }\n      else { // mouse is within the padding, set to 0\n        localMouse.x = 0;\n      }\n\n      if (abs(localMouse.y) > padding) {\n        if (localMouse.y < 0) {\n          localMouse.y += padding;\n        }\n        else {\n          localMouse.y -= padding;\n        }\n      }\n      else {\n        localMouse.y = 0;\n      }\n    },\n\n    /**\n     * Rotates object by invoking its rotate method\n     * @private\n     * @param {Number} x pointer's x coordinate\n     * @param {Number} y pointer's y coordinate\n     * @return {Boolean} true if the rotation occurred\n     */\n    _rotateObject: function (x, y) {\n\n      var t = this._currentTransform,\n          target = t.target, constraintPosition,\n          constraintPosition = target.translateToOriginPoint(target.getCenterPoint(), t.originX, t.originY);\n\n      if (target.lockRotation) {\n        return false;\n      }\n\n      var lastAngle = atan2(t.ey - constraintPosition.y, t.ex - constraintPosition.x),\n          curAngle = atan2(y - constraintPosition.y, x - constraintPosition.x),\n          angle = radiansToDegrees(curAngle - lastAngle + t.theta),\n          hasRotated = true;\n\n      if (target.snapAngle > 0) {\n        var snapAngle  = target.snapAngle,\n            snapThreshold  = target.snapThreshold || snapAngle,\n            rightAngleLocked = Math.ceil(angle / snapAngle) * snapAngle,\n            leftAngleLocked = Math.floor(angle / snapAngle) * snapAngle;\n\n        if (Math.abs(angle - leftAngleLocked) < snapThreshold) {\n          angle = leftAngleLocked;\n        }\n        else if (Math.abs(angle - rightAngleLocked) < snapThreshold) {\n          angle = rightAngleLocked;\n        }\n      }\n\n      // normalize angle to positive value\n      if (angle < 0) {\n        angle = 360 + angle;\n      }\n      angle %= 360;\n\n      if (target.angle === angle) {\n        hasRotated = false;\n      }\n      else {\n        // rotation only happen here\n        target.angle = angle;\n        // Make sure the constraints apply\n        target.setPositionByOrigin(constraintPosition, t.originX, t.originY);\n      }\n\n      return hasRotated;\n    },\n\n    /**\n     * Set the cursor type of the canvas element\n     * @param {String} value Cursor type of the canvas element.\n     * @see http://www.w3.org/TR/css3-ui/#cursor\n     */\n    setCursor: function (value) {\n      this.upperCanvasEl.style.cursor = value;\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx to draw the selection on\n     */\n    _drawSelection: function (ctx) {\n      var groupSelector = this._groupSelector,\n          left = groupSelector.left,\n          top = groupSelector.top,\n          aleft = abs(left),\n          atop = abs(top);\n\n      if (this.selectionColor) {\n        ctx.fillStyle = this.selectionColor;\n\n        ctx.fillRect(\n          groupSelector.ex - ((left > 0) ? 0 : -left),\n          groupSelector.ey - ((top > 0) ? 0 : -top),\n          aleft,\n          atop\n        );\n      }\n\n      if (!this.selectionLineWidth || !this.selectionBorderColor) {\n        return;\n      }\n      ctx.lineWidth = this.selectionLineWidth;\n      ctx.strokeStyle = this.selectionBorderColor;\n\n      // selection border\n      if (this.selectionDashArray.length > 1 && !supportLineDash) {\n\n        var px = groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0 : aleft),\n            py = groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0 : atop);\n\n        ctx.beginPath();\n\n        fabric.util.drawDashedLine(ctx, px, py, px + aleft, py, this.selectionDashArray);\n        fabric.util.drawDashedLine(ctx, px, py + atop - 1, px + aleft, py + atop - 1, this.selectionDashArray);\n        fabric.util.drawDashedLine(ctx, px, py, px, py + atop, this.selectionDashArray);\n        fabric.util.drawDashedLine(ctx, px + aleft - 1, py, px + aleft - 1, py + atop, this.selectionDashArray);\n\n        ctx.closePath();\n        ctx.stroke();\n      }\n      else {\n        fabric.Object.prototype._setLineDash.call(this, ctx, this.selectionDashArray);\n        ctx.strokeRect(\n          groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0 : aleft),\n          groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0 : atop),\n          aleft,\n          atop\n        );\n      }\n    },\n\n    /**\n     * Method that determines what object we are clicking on\n     * the skipGroup parameter is for internal use, is needed for shift+click action\n     * 11/09/2018 TODO: would be cool if findTarget could discern between being a full target\n     * or the outside part of the corner.\n     * @param {Event} e mouse event\n     * @param {Boolean} skipGroup when true, activeGroup is skipped and only objects are traversed through\n     * @return {fabric.Object} the target found\n     */\n    findTarget: function (e, skipGroup) {\n      if (this.skipTargetFind) {\n        return;\n      }\n\n      var ignoreZoom = true,\n          pointer = this.getPointer(e, ignoreZoom),\n          activeObject = this._activeObject,\n          aObjects = this.getActiveObjects(),\n          activeTarget, activeTargetSubs;\n\n      // first check current group (if one exists)\n      // active group does not check sub targets like normal groups.\n      // if active group just exits.\n      this.targets = [];\n\n      if (aObjects.length > 1 && !skipGroup && activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n        return activeObject;\n      }\n      // if we hit the corner of an activeObject, let's return that.\n      if (aObjects.length === 1 && activeObject._findTargetCorner(pointer)) {\n        return activeObject;\n      }\n      if (aObjects.length === 1 &&\n        activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n        if (!this.preserveObjectStacking) {\n          return activeObject;\n        }\n        else {\n          activeTarget = activeObject;\n          activeTargetSubs = this.targets;\n          this.targets = [];\n        }\n      }\n      var target = this._searchPossibleTargets(this._objects, pointer);\n      if (e[this.altSelectionKey] && target && activeTarget && target !== activeTarget) {\n        target = activeTarget;\n        this.targets = activeTargetSubs;\n      }\n      return target;\n    },\n\n    /**\n     * Checks point is inside the object.\n     * @param {Object} [pointer] x,y object of point coordinates we want to check.\n     * @param {fabric.Object} obj Object to test against\n     * @param {Object} [globalPointer] x,y object of point coordinates relative to canvas used to search per pixel target.\n     * @return {Boolean} true if point is contained within an area of given object\n     * @private\n     */\n    _checkTarget: function(pointer, obj, globalPointer) {\n      if (obj &&\n          obj.visible &&\n          obj.evented &&\n          this.containsPoint(null, obj, pointer)){\n        if ((this.perPixelTargetFind || obj.perPixelTargetFind) && !obj.isEditing) {\n          var isTransparent = this.isTargetTransparent(obj, globalPointer.x, globalPointer.y);\n          if (!isTransparent) {\n            return true;\n          }\n        }\n        else {\n          return true;\n        }\n      }\n    },\n\n    /**\n     * Function used to search inside objects an object that contains pointer in bounding box or that contains pointerOnCanvas when painted\n     * @param {Array} [objects] objects array to look into\n     * @param {Object} [pointer] x,y object of point coordinates we want to check.\n     * @return {fabric.Object} object that contains pointer\n     * @private\n     */\n    _searchPossibleTargets: function(objects, pointer) {\n      // Cache all targets where their bounding box contains point.\n      var target, i = objects.length, subTarget;\n      // Do not check for currently grouped objects, since we check the parent group itself.\n      // until we call this function specifically to search inside the activeGroup\n      while (i--) {\n        var objToCheck = objects[i];\n        var pointerToUse = objToCheck.group && objToCheck.group.type !== 'activeSelection' ?\n          this._normalizePointer(objToCheck.group, pointer) : pointer;\n        if (this._checkTarget(pointerToUse, objToCheck, pointer)) {\n          target = objects[i];\n          if (target.subTargetCheck && target instanceof fabric.Group) {\n            subTarget = this._searchPossibleTargets(target._objects, pointer);\n            subTarget && this.targets.push(subTarget);\n          }\n          break;\n        }\n      }\n      return target;\n    },\n\n    /**\n     * Returns pointer coordinates without the effect of the viewport\n     * @param {Object} pointer with \"x\" and \"y\" number values\n     * @return {Object} object with \"x\" and \"y\" number values\n     */\n    restorePointerVpt: function(pointer) {\n      return fabric.util.transformPoint(\n        pointer,\n        fabric.util.invertTransform(this.viewportTransform)\n      );\n    },\n\n    /**\n     * Returns pointer coordinates relative to canvas.\n     * Can return coordinates with or without viewportTransform.\n     * ignoreZoom false gives back coordinates that represent\n     * the point clicked on canvas element.\n     * ignoreZoom true gives back coordinates after being processed\n     * by the viewportTransform ( sort of coordinates of what is displayed\n     * on the canvas where you are clicking.\n     * ignoreZoom true = HTMLElement coordinates relative to top,left\n     * ignoreZoom false, default = fabric space coordinates, the same used for shape position\n     * To interact with your shapes top and left you want to use ignoreZoom true\n     * most of the time, while ignoreZoom false will give you coordinates\n     * compatible with the object.oCoords system.\n     * of the time.\n     * @param {Event} e\n     * @param {Boolean} ignoreZoom\n     * @return {Object} object with \"x\" and \"y\" number values\n     */\n    getPointer: function (e, ignoreZoom) {\n      // return cached values if we are in the event processing chain\n      if (this._absolutePointer && !ignoreZoom) {\n        return this._absolutePointer;\n      }\n      if (this._pointer && ignoreZoom) {\n        return this._pointer;\n      }\n\n      var pointer = getPointer(e),\n          upperCanvasEl = this.upperCanvasEl,\n          bounds = upperCanvasEl.getBoundingClientRect(),\n          boundsWidth = bounds.width || 0,\n          boundsHeight = bounds.height || 0,\n          cssScale;\n\n      if (!boundsWidth || !boundsHeight ) {\n        if ('top' in bounds && 'bottom' in bounds) {\n          boundsHeight = Math.abs( bounds.top - bounds.bottom );\n        }\n        if ('right' in bounds && 'left' in bounds) {\n          boundsWidth = Math.abs( bounds.right - bounds.left );\n        }\n      }\n\n      this.calcOffset();\n      pointer.x = pointer.x - this._offset.left;\n      pointer.y = pointer.y - this._offset.top;\n      if (!ignoreZoom) {\n        pointer = this.restorePointerVpt(pointer);\n      }\n\n      if (boundsWidth === 0 || boundsHeight === 0) {\n        // If bounds are not available (i.e. not visible), do not apply scale.\n        cssScale = { width: 1, height: 1 };\n      }\n      else {\n        cssScale = {\n          width: upperCanvasEl.width / boundsWidth,\n          height: upperCanvasEl.height / boundsHeight\n        };\n      }\n\n      return {\n        x: pointer.x * cssScale.width,\n        y: pointer.y * cssScale.height\n      };\n    },\n\n    /**\n     * @private\n     * @throws {CANVAS_INIT_ERROR} If canvas can not be initialized\n     */\n    _createUpperCanvas: function () {\n      var lowerCanvasClass = this.lowerCanvasEl.className.replace(/\\s*lower-canvas\\s*/, '');\n\n      // there is no need to create a new upperCanvas element if we have already one.\n      if (this.upperCanvasEl) {\n        this.upperCanvasEl.className = '';\n      }\n      else {\n        this.upperCanvasEl = this._createCanvasElement();\n      }\n      fabric.util.addClass(this.upperCanvasEl, 'upper-canvas ' + lowerCanvasClass);\n\n      this.wrapperEl.appendChild(this.upperCanvasEl);\n\n      this._copyCanvasStyle(this.lowerCanvasEl, this.upperCanvasEl);\n      this._applyCanvasStyle(this.upperCanvasEl);\n      this.contextTop = this.upperCanvasEl.getContext('2d');\n    },\n\n    /**\n     * @private\n     */\n    _createCacheCanvas: function () {\n      this.cacheCanvasEl = this._createCanvasElement();\n      this.cacheCanvasEl.setAttribute('width', this.width);\n      this.cacheCanvasEl.setAttribute('height', this.height);\n      this.contextCache = this.cacheCanvasEl.getContext('2d');\n    },\n\n    /**\n     * @private\n     */\n    _initWrapperElement: function () {\n      this.wrapperEl = fabric.util.wrapElement(this.lowerCanvasEl, 'div', {\n        'class': this.containerClass\n      });\n      fabric.util.setStyle(this.wrapperEl, {\n        width: this.width + 'px',\n        height: this.height + 'px',\n        position: 'relative'\n      });\n      fabric.util.makeElementUnselectable(this.wrapperEl);\n    },\n\n    /**\n     * @private\n     * @param {HTMLElement} element canvas element to apply styles on\n     */\n    _applyCanvasStyle: function (element) {\n      var width = this.width || element.width,\n          height = this.height || element.height;\n\n      fabric.util.setStyle(element, {\n        position: 'absolute',\n        width: width + 'px',\n        height: height + 'px',\n        left: 0,\n        top: 0,\n        'touch-action': this.allowTouchScrolling ? 'manipulation' : 'none',\n        '-ms-touch-action': this.allowTouchScrolling ? 'manipulation' : 'none'\n      });\n      element.width = width;\n      element.height = height;\n      fabric.util.makeElementUnselectable(element);\n    },\n\n    /**\n     * Copy the entire inline style from one element (fromEl) to another (toEl)\n     * @private\n     * @param {Element} fromEl Element style is copied from\n     * @param {Element} toEl Element copied style is applied to\n     */\n    _copyCanvasStyle: function (fromEl, toEl) {\n      toEl.style.cssText = fromEl.style.cssText;\n    },\n\n    /**\n     * Returns context of canvas where object selection is drawn\n     * @return {CanvasRenderingContext2D}\n     */\n    getSelectionContext: function() {\n      return this.contextTop;\n    },\n\n    /**\n     * Returns &lt;canvas> element on which object selection is drawn\n     * @return {HTMLCanvasElement}\n     */\n    getSelectionElement: function () {\n      return this.upperCanvasEl;\n    },\n\n    /**\n     * Returns currently active object\n     * @return {fabric.Object} active object\n     */\n    getActiveObject: function () {\n      return this._activeObject;\n    },\n\n    /**\n     * Returns an array with the current selected objects\n     * @return {fabric.Object} active object\n     */\n    getActiveObjects: function () {\n      var active = this._activeObject;\n      if (active) {\n        if (active.type === 'activeSelection' && active._objects) {\n          return active._objects.slice(0);\n        }\n        else {\n          return [active];\n        }\n      }\n      return [];\n    },\n\n    /**\n     * @private\n     * @param {fabric.Object} obj Object that was removed\n     */\n    _onObjectRemoved: function(obj) {\n      // removing active object should fire \"selection:cleared\" events\n      if (obj === this._activeObject) {\n        this.fire('before:selection:cleared', { target: obj });\n        this._discardActiveObject();\n        this.fire('selection:cleared', { target: obj });\n        obj.fire('deselected');\n      }\n      if (this._hoveredTarget === obj) {\n        this._hoveredTarget = null;\n      }\n      this.callSuper('_onObjectRemoved', obj);\n    },\n\n    /**\n     * @private\n     * Compares the old activeObject with the current one and fires correct events\n     * @param {fabric.Object} obj old activeObject\n     */\n    _fireSelectionEvents: function(oldObjects, e) {\n      var somethingChanged = false, objects = this.getActiveObjects(),\n          added = [], removed = [], opt = { e: e };\n      oldObjects.forEach(function(oldObject) {\n        if (objects.indexOf(oldObject) === -1) {\n          somethingChanged = true;\n          oldObject.fire('deselected', opt);\n          removed.push(oldObject);\n        }\n      });\n      objects.forEach(function(object) {\n        if (oldObjects.indexOf(object) === -1) {\n          somethingChanged = true;\n          object.fire('selected', opt);\n          added.push(object);\n        }\n      });\n      if (oldObjects.length > 0 && objects.length > 0) {\n        opt.selected = added;\n        opt.deselected = removed;\n        // added for backward compatibility\n        opt.updated = added[0] || removed[0];\n        opt.target = this._activeObject;\n        somethingChanged && this.fire('selection:updated', opt);\n      }\n      else if (objects.length > 0) {\n        // deprecated event\n        if (objects.length === 1) {\n          opt.target = added[0];\n          this.fire('object:selected', opt);\n        }\n        opt.selected = added;\n        // added for backward compatibility\n        opt.target = this._activeObject;\n        this.fire('selection:created', opt);\n      }\n      else if (oldObjects.length > 0) {\n        opt.deselected = removed;\n        this.fire('selection:cleared', opt);\n      }\n    },\n\n    /**\n     * Sets given object as the only active object on canvas\n     * @param {fabric.Object} object Object to set as an active one\n     * @param {Event} [e] Event (passed along when firing \"object:selected\")\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    setActiveObject: function (object, e) {\n      var currentActives = this.getActiveObjects();\n      this._setActiveObject(object, e);\n      this._fireSelectionEvents(currentActives, e);\n      return this;\n    },\n\n    /**\n     * @private\n     * @param {Object} object to set as active\n     * @param {Event} [e] Event (passed along when firing \"object:selected\")\n     * @return {Boolean} true if the selection happened\n     */\n    _setActiveObject: function(object, e) {\n      if (this._activeObject === object) {\n        return false;\n      }\n      if (!this._discardActiveObject(e, object)) {\n        return false;\n      }\n      if (object.onSelect({ e: e })) {\n        return false;\n      }\n      this._activeObject = object;\n      return true;\n    },\n\n    /**\n     * @private\n     */\n    _discardActiveObject: function(e, object) {\n      var obj = this._activeObject;\n      if (obj) {\n        // onDeselect return TRUE to cancel selection;\n        if (obj.onDeselect({ e: e, object: object })) {\n          return false;\n        }\n        this._activeObject = null;\n      }\n      return true;\n    },\n\n    /**\n     * Discards currently active object and fire events. If the function is called by fabric\n     * as a consequence of a mouse event, the event is passed as a parameter and\n     * sent to the fire function for the custom events. When used as a method the\n     * e param does not have any application.\n     * @param {event} e\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    discardActiveObject: function (e) {\n      var currentActives = this.getActiveObjects(), activeObject = this.getActiveObject();\n      if (currentActives.length) {\n        this.fire('before:selection:cleared', { target: activeObject, e: e });\n      }\n      this._discardActiveObject(e);\n      this._fireSelectionEvents(currentActives, e);\n      return this;\n    },\n\n    /**\n     * Clears a canvas element and removes all event listeners\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    dispose: function () {\n      var wrapper = this.wrapperEl;\n      this.removeListeners();\n      wrapper.removeChild(this.upperCanvasEl);\n      wrapper.removeChild(this.lowerCanvasEl);\n      this.contextCache = null;\n      this.contextTop = null;\n      ['upperCanvasEl', 'cacheCanvasEl'].forEach((function(element) {\n        fabric.util.cleanUpJsdomNode(this[element]);\n        this[element] = undefined;\n      }).bind(this));\n      if (wrapper.parentNode) {\n        wrapper.parentNode.replaceChild(this.lowerCanvasEl, this.wrapperEl);\n      }\n      delete this.wrapperEl;\n      fabric.StaticCanvas.prototype.dispose.call(this);\n      return this;\n    },\n\n    /**\n     * Clears all contexts (background, main, top) of an instance\n     * @return {fabric.Canvas} thisArg\n     * @chainable\n     */\n    clear: function () {\n      // this.discardActiveGroup();\n      this.discardActiveObject();\n      this.clearContext(this.contextTop);\n      return this.callSuper('clear');\n    },\n\n    /**\n     * Draws objects' controls (borders/controls)\n     * @param {CanvasRenderingContext2D} ctx Context to render controls on\n     */\n    drawControls: function(ctx) {\n      var activeObject = this._activeObject;\n\n      if (activeObject) {\n        activeObject._renderControls(ctx);\n      }\n    },\n\n    /**\n     * @private\n     */\n    _toObject: function(instance, methodName, propertiesToInclude) {\n      //If the object is part of the current selection group, it should\n      //be transformed appropriately\n      //i.e. it should be serialised as it would appear if the selection group\n      //were to be destroyed.\n      var originalProperties = this._realizeGroupTransformOnObject(instance),\n          object = this.callSuper('_toObject', instance, methodName, propertiesToInclude);\n      //Undo the damage we did by changing all of its properties\n      this._unwindGroupTransformOnObject(instance, originalProperties);\n      return object;\n    },\n\n    /**\n     * Realises an object's group transformation on it\n     * @private\n     * @param {fabric.Object} [instance] the object to transform (gets mutated)\n     * @returns the original values of instance which were changed\n     */\n    _realizeGroupTransformOnObject: function(instance) {\n      if (instance.group && instance.group.type === 'activeSelection' && this._activeObject === instance.group) {\n        var layoutProps = ['angle', 'flipX', 'flipY', 'left', 'scaleX', 'scaleY', 'skewX', 'skewY', 'top'];\n        //Copy all the positionally relevant properties across now\n        var originalValues = {};\n        layoutProps.forEach(function(prop) {\n          originalValues[prop] = instance[prop];\n        });\n        this._activeObject.realizeTransform(instance);\n        return originalValues;\n      }\n      else {\n        return null;\n      }\n    },\n\n    /**\n     * Restores the changed properties of instance\n     * @private\n     * @param {fabric.Object} [instance] the object to un-transform (gets mutated)\n     * @param {Object} [originalValues] the original values of instance, as returned by _realizeGroupTransformOnObject\n     */\n    _unwindGroupTransformOnObject: function(instance, originalValues) {\n      if (originalValues) {\n        instance.set(originalValues);\n      }\n    },\n\n    /**\n     * @private\n     */\n    _setSVGObject: function(markup, instance, reviver) {\n      //If the object is in a selection group, simulate what would happen to that\n      //object when the group is deselected\n      var originalProperties = this._realizeGroupTransformOnObject(instance);\n      this.callSuper('_setSVGObject', markup, instance, reviver);\n      this._unwindGroupTransformOnObject(instance, originalProperties);\n    },\n\n    setViewportTransform: function (vpt) {\n      if (this.renderOnAddRemove && this._activeObject && this._activeObject.isEditing) {\n        this._activeObject.clearContextTop();\n      }\n      fabric.StaticCanvas.prototype.setViewportTransform.call(this, vpt);\n    }\n  });\n\n  // copying static properties manually to work around Opera's bug,\n  // where \"prototype\" property is enumerable and overrides existing prototype\n  for (var prop in fabric.StaticCanvas) {\n    if (prop !== 'prototype') {\n      fabric.Canvas[prop] = fabric.StaticCanvas[prop];\n    }\n  }\n})();\n\n\n(function() {\n\n  var cursorOffset = {\n        mt: 0, // n\n        tr: 1, // ne\n        mr: 2, // e\n        br: 3, // se\n        mb: 4, // s\n        bl: 5, // sw\n        ml: 6, // w\n        tl: 7 // nw\n      },\n      addListener = fabric.util.addListener,\n      removeListener = fabric.util.removeListener,\n      RIGHT_CLICK = 3, MIDDLE_CLICK = 2, LEFT_CLICK = 1,\n      addEventOptions = { passive: false };\n\n  function checkClick(e, value) {\n    return e.button && (e.button === value - 1);\n  }\n\n  fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {\n\n    /**\n     * Map of cursor style values for each of the object controls\n     * @private\n     */\n    cursorMap: [\n      'n-resize',\n      'ne-resize',\n      'e-resize',\n      'se-resize',\n      's-resize',\n      'sw-resize',\n      'w-resize',\n      'nw-resize'\n    ],\n\n    /**\n     * Contains the id of the touch event that owns the fabric transform\n     * @type Number\n     * @private\n     */\n    mainTouchId: null,\n\n    /**\n     * Adds mouse listeners to canvas\n     * @private\n     */\n    _initEventListeners: function () {\n      // in case we initialized the class twice. This should not happen normally\n      // but in some kind of applications where the canvas element may be changed\n      // this is a workaround to having double listeners.\n      this.removeListeners();\n      this._bindEvents();\n      this.addOrRemove(addListener, 'add');\n    },\n\n    /**\n     * return an event prefix pointer or mouse.\n     * @private\n     */\n    _getEventPrefix: function () {\n      return this.enablePointerEvents ? 'pointer' : 'mouse';\n    },\n\n    addOrRemove: function(functor, eventjsFunctor) {\n      var canvasElement = this.upperCanvasEl,\n          eventTypePrefix = this._getEventPrefix();\n      functor(fabric.window, 'resize', this._onResize);\n      functor(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n      functor(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n      functor(canvasElement, eventTypePrefix + 'out', this._onMouseOut);\n      functor(canvasElement, eventTypePrefix + 'enter', this._onMouseEnter);\n      functor(canvasElement, 'wheel', this._onMouseWheel);\n      functor(canvasElement, 'contextmenu', this._onContextMenu);\n      functor(canvasElement, 'dblclick', this._onDoubleClick);\n      functor(canvasElement, 'dragover', this._onDragOver);\n      functor(canvasElement, 'dragenter', this._onDragEnter);\n      functor(canvasElement, 'dragleave', this._onDragLeave);\n      functor(canvasElement, 'drop', this._onDrop);\n      if (!this.enablePointerEvents) {\n        functor(canvasElement, 'touchstart', this._onTouchStart, addEventOptions);\n      }\n      if (typeof eventjs !== 'undefined' && eventjsFunctor in eventjs) {\n        eventjs[eventjsFunctor](canvasElement, 'gesture', this._onGesture);\n        eventjs[eventjsFunctor](canvasElement, 'drag', this._onDrag);\n        eventjs[eventjsFunctor](canvasElement, 'orientation', this._onOrientationChange);\n        eventjs[eventjsFunctor](canvasElement, 'shake', this._onShake);\n        eventjs[eventjsFunctor](canvasElement, 'longpress', this._onLongPress);\n      }\n    },\n\n    /**\n     * Removes all event listeners\n     */\n    removeListeners: function() {\n      this.addOrRemove(removeListener, 'remove');\n      // if you dispose on a mouseDown, before mouse up, you need to clean document to...\n      var eventTypePrefix = this._getEventPrefix();\n      removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n      removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n      removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n      removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n    },\n\n    /**\n     * @private\n     */\n    _bindEvents: function() {\n      if (this.eventsBound) {\n        // for any reason we pass here twice we do not want to bind events twice.\n        return;\n      }\n      this._onMouseDown = this._onMouseDown.bind(this);\n      this._onTouchStart = this._onTouchStart.bind(this);\n      this._onMouseMove = this._onMouseMove.bind(this);\n      this._onMouseUp = this._onMouseUp.bind(this);\n      this._onTouchEnd = this._onTouchEnd.bind(this);\n      this._onResize = this._onResize.bind(this);\n      this._onGesture = this._onGesture.bind(this);\n      this._onDrag = this._onDrag.bind(this);\n      this._onShake = this._onShake.bind(this);\n      this._onLongPress = this._onLongPress.bind(this);\n      this._onOrientationChange = this._onOrientationChange.bind(this);\n      this._onMouseWheel = this._onMouseWheel.bind(this);\n      this._onMouseOut = this._onMouseOut.bind(this);\n      this._onMouseEnter = this._onMouseEnter.bind(this);\n      this._onContextMenu = this._onContextMenu.bind(this);\n      this._onDoubleClick = this._onDoubleClick.bind(this);\n      this._onDragOver = this._onDragOver.bind(this);\n      this._onDragEnter = this._simpleEventHandler.bind(this, 'dragenter');\n      this._onDragLeave = this._simpleEventHandler.bind(this, 'dragleave');\n      this._onDrop = this._simpleEventHandler.bind(this, 'drop');\n      this.eventsBound = true;\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on Event.js gesture\n     * @param {Event} [self] Inner Event object\n     */\n    _onGesture: function(e, self) {\n      this.__onTransformGesture && this.__onTransformGesture(e, self);\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on Event.js drag\n     * @param {Event} [self] Inner Event object\n     */\n    _onDrag: function(e, self) {\n      this.__onDrag && this.__onDrag(e, self);\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on wheel event\n     */\n    _onMouseWheel: function(e) {\n      this.__onMouseWheel(e);\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onMouseOut: function(e) {\n      var target = this._hoveredTarget;\n      this.fire('mouse:out', { target: target, e: e });\n      this._hoveredTarget = null;\n      target && target.fire('mouseout', { e: e });\n      if (this._iTextInstances) {\n        this._iTextInstances.forEach(function(obj) {\n          if (obj.isEditing) {\n            obj.hiddenTextarea.focus();\n          }\n        });\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mouseenter\n     */\n    _onMouseEnter: function(e) {\n      // This find target and consequent 'mouse:over' is used to\n      // clear old instances on hovered target.\n      // calling findTarget has the side effect of killing target.__corner.\n      // as a short term fix we are not firing this if we are currently transforming.\n      // as a long term fix we need to separate the action of finding a target with the\n      // side effects we added to it.\n      if (!this.currentTransform && !this.findTarget(e)) {\n        this.fire('mouse:over', { target: null, e: e });\n        this._hoveredTarget = null;\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on Event.js orientation change\n     * @param {Event} [self] Inner Event object\n     */\n    _onOrientationChange: function(e, self) {\n      this.__onOrientationChange && this.__onOrientationChange(e, self);\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on Event.js shake\n     * @param {Event} [self] Inner Event object\n     */\n    _onShake: function(e, self) {\n      this.__onShake && this.__onShake(e, self);\n    },\n\n    /**\n     * @private\n     * @param {Event} [e] Event object fired on Event.js shake\n     * @param {Event} [self] Inner Event object\n     */\n    _onLongPress: function(e, self) {\n      this.__onLongPress && this.__onLongPress(e, self);\n    },\n\n    /**\n     * prevent default to allow drop event to be fired\n     * @private\n     * @param {Event} [e] Event object fired on Event.js shake\n     */\n    _onDragOver: function(e) {\n      e.preventDefault();\n      var target = this._simpleEventHandler('dragover', e);\n      this._fireEnterLeaveEvents(target, e);\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onContextMenu: function (e) {\n      if (this.stopContextMenu) {\n        e.stopPropagation();\n        e.preventDefault();\n      }\n      return false;\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onDoubleClick: function (e) {\n      this._cacheTransformEventData(e);\n      this._handleEvent(e, 'dblclick');\n      this._resetTransformEventData(e);\n    },\n\n    /**\n     * Return a the id of an event.\n     * returns either the pointerId or the identifier or 0 for the mouse event\n     * @private\n     * @param {Event} evt Event object\n     */\n    getPointerId: function(evt) {\n      var changedTouches = evt.changedTouches;\n\n      if (changedTouches) {\n        return changedTouches[0] && changedTouches[0].identifier;\n      }\n\n      if (this.enablePointerEvents) {\n        return evt.pointerId;\n      }\n\n      return -1;\n    },\n\n    /**\n     * Determines if an event has the id of the event that is considered main\n     * @private\n     * @param {evt} event Event object\n     */\n    _isMainEvent: function(evt) {\n      if (evt.isPrimary === true) {\n        return true;\n      }\n      if (evt.isPrimary === false) {\n        return false;\n      }\n      if (evt.type === 'touchend' && evt.touches.length === 0) {\n        return true;\n      }\n      if (evt.changedTouches) {\n        return evt.changedTouches[0].identifier === this.mainTouchId;\n      }\n      return true;\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onTouchStart: function(e) {\n      e.preventDefault();\n      if (this.mainTouchId === null) {\n        this.mainTouchId = this.getPointerId(e);\n      }\n      this.__onMouseDown(e);\n      this._resetTransformEventData();\n      var canvasElement = this.upperCanvasEl,\n          eventTypePrefix = this._getEventPrefix();\n      addListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n      addListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n      // Unbind mousedown to prevent double triggers from touch devices\n      removeListener(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onMouseDown: function (e) {\n      this.__onMouseDown(e);\n      this._resetTransformEventData();\n      var canvasElement = this.upperCanvasEl,\n          eventTypePrefix = this._getEventPrefix();\n      removeListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n      addListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n      addListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onTouchEnd: function(e) {\n      if (e.touches.length > 0) {\n        // if there are still touches stop here\n        return;\n      }\n      this.__onMouseUp(e);\n      this._resetTransformEventData();\n      this.mainTouchId = null;\n      var eventTypePrefix = this._getEventPrefix();\n      removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n      removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n      var _this = this;\n      if (this._willAddMouseDown) {\n        clearTimeout(this._willAddMouseDown);\n      }\n      this._willAddMouseDown = setTimeout(function() {\n        // Wait 400ms before rebinding mousedown to prevent double triggers\n        // from touch devices\n        addListener(_this.upperCanvasEl, eventTypePrefix + 'down', _this._onMouseDown);\n        _this._willAddMouseDown = 0;\n      }, 400);\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mouseup\n     */\n    _onMouseUp: function (e) {\n      this.__onMouseUp(e);\n      this._resetTransformEventData();\n      var canvasElement = this.upperCanvasEl,\n          eventTypePrefix = this._getEventPrefix();\n      if (this._isMainEvent(e)) {\n        removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n        removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n        addListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousemove\n     */\n    _onMouseMove: function (e) {\n      !this.allowTouchScrolling && e.preventDefault && e.preventDefault();\n      this.__onMouseMove(e);\n    },\n\n    /**\n     * @private\n     */\n    _onResize: function () {\n      this.calcOffset();\n    },\n\n    /**\n     * Decides whether the canvas should be redrawn in mouseup and mousedown events.\n     * @private\n     * @param {Object} target\n     */\n    _shouldRender: function(target) {\n      var activeObject = this._activeObject;\n\n      if (\n        !!activeObject !== !!target ||\n        (activeObject && target && (activeObject !== target))\n      ) {\n        // this covers: switch of target, from target to no target, selection of target\n        // multiSelection with key and mouse\n        return true;\n      }\n      else if (activeObject && activeObject.isEditing) {\n        // if we mouse up/down over a editing textbox a cursor change,\n        // there is no need to re render\n        return false;\n      }\n      return false;\n    },\n\n    /**\n     * Method that defines the actions when mouse is released on canvas.\n     * The method resets the currentTransform parameters, store the image corner\n     * position in the image object and render the canvas on top.\n     * @private\n     * @param {Event} e Event object fired on mouseup\n     */\n    __onMouseUp: function (e) {\n      var target, transform = this._currentTransform,\n          groupSelector = this._groupSelector, shouldRender = false,\n          isClick = (!groupSelector || (groupSelector.left === 0 && groupSelector.top === 0));\n      this._cacheTransformEventData(e);\n      target = this._target;\n      this._handleEvent(e, 'up:before');\n      // if right/middle click just fire events and return\n      // target undefined will make the _handleEvent search the target\n      if (checkClick(e, RIGHT_CLICK)) {\n        if (this.fireRightClick) {\n          this._handleEvent(e, 'up', RIGHT_CLICK, isClick);\n        }\n        return;\n      }\n\n      if (checkClick(e, MIDDLE_CLICK)) {\n        if (this.fireMiddleClick) {\n          this._handleEvent(e, 'up', MIDDLE_CLICK, isClick);\n        }\n        this._resetTransformEventData();\n        return;\n      }\n\n      if (this.isDrawingMode && this._isCurrentlyDrawing) {\n        this._onMouseUpInDrawingMode(e);\n        return;\n      }\n\n      if (!this._isMainEvent(e)) {\n        return;\n      }\n      if (transform) {\n        this._finalizeCurrentTransform(e);\n        shouldRender = transform.actionPerformed;\n      }\n\n      if (!isClick) {\n        this._maybeGroupObjects(e);\n        shouldRender || (shouldRender = this._shouldRender(target));\n      }\n      if (target) {\n        target.isMoving = false;\n      }\n      this._setCursorFromEvent(e, target);\n      this._handleEvent(e, 'up', LEFT_CLICK, isClick);\n      this._groupSelector = null;\n      this._currentTransform = null;\n      // reset the target information about which corner is selected\n      target && (target.__corner = 0);\n      if (shouldRender) {\n        this.requestRenderAll();\n      }\n      else if (!isClick) {\n        this.renderTop();\n      }\n    },\n\n    /**\n     * @private\n     * Handle event firing for target and subtargets\n     * @param {Event} e event from mouse\n     * @param {String} eventType event to fire (up, down or move)\n     * @return {Fabric.Object} target return the the target found, for internal reasons.\n     */\n    _simpleEventHandler: function(eventType, e) {\n      var target = this.findTarget(e),\n          targets = this.targets,\n          options = {\n            e: e,\n            target: target,\n            subTargets: targets,\n          };\n      this.fire(eventType, options);\n      target && target.fire(eventType, options);\n      if (!targets) {\n        return target;\n      }\n      for (var i = 0; i < targets.length; i++) {\n        targets[i].fire(eventType, options);\n      }\n      return target;\n    },\n\n    /**\n     * @private\n     * Handle event firing for target and subtargets\n     * @param {Event} e event from mouse\n     * @param {String} eventType event to fire (up, down or move)\n     * @param {fabric.Object} targetObj receiving event\n     * @param {Number} [button] button used in the event 1 = left, 2 = middle, 3 = right\n     * @param {Boolean} isClick for left button only, indicates that the mouse up happened without move.\n     */\n    _handleEvent: function(e, eventType, button, isClick) {\n      var target = this._target,\n          targets = this.targets || [],\n          options = {\n            e: e,\n            target: target,\n            subTargets: targets,\n            button: button || LEFT_CLICK,\n            isClick: isClick || false,\n            pointer: this._pointer,\n            absolutePointer: this._absolutePointer,\n            transform: this._currentTransform\n          };\n      this.fire('mouse:' + eventType, options);\n      target && target.fire('mouse' + eventType, options);\n      for (var i = 0; i < targets.length; i++) {\n        targets[i].fire('mouse' + eventType, options);\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e send the mouse event that generate the finalize down, so it can be used in the event\n     */\n    _finalizeCurrentTransform: function(e) {\n\n      var transform = this._currentTransform,\n          target = transform.target,\n          eventName,\n          options = {\n            e: e,\n            target: target,\n            transform: transform,\n          };\n\n      if (target._scaling) {\n        target._scaling = false;\n      }\n\n      target.setCoords();\n\n      if (transform.actionPerformed || (this.stateful && target.hasStateChanged())) {\n        if (transform.actionPerformed) {\n          eventName = this._addEventOptions(options, transform);\n          this._fire(eventName, options);\n        }\n        this._fire('modified', options);\n      }\n    },\n\n    /**\n     * Mutate option object in order to add by property and give back the event name.\n     * @private\n     * @param {Object} options to mutate\n     * @param {Object} transform to inspect action from\n     */\n    _addEventOptions: function(options, transform) {\n      // we can probably add more details at low cost\n      // scale change, rotation changes, translation changes\n      var eventName, by;\n      switch (transform.action) {\n        case 'scaleX':\n          eventName = 'scaled';\n          by = 'x';\n          break;\n        case 'scaleY':\n          eventName = 'scaled';\n          by = 'y';\n          break;\n        case 'skewX':\n          eventName = 'skewed';\n          by = 'x';\n          break;\n        case 'skewY':\n          eventName = 'skewed';\n          by = 'y';\n          break;\n        case 'scale':\n          eventName = 'scaled';\n          by = 'equally';\n          break;\n        case 'rotate':\n          eventName = 'rotated';\n          break;\n        case 'drag':\n          eventName = 'moved';\n          break;\n      }\n      options.by = by;\n      return eventName;\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    _onMouseDownInDrawingMode: function(e) {\n      this._isCurrentlyDrawing = true;\n      if (this.getActiveObject()) {\n        this.discardActiveObject(e).requestRenderAll();\n      }\n      if (this.clipTo) {\n        fabric.util.clipContext(this, this.contextTop);\n      }\n      var pointer = this.getPointer(e);\n      this.freeDrawingBrush.onMouseDown(pointer, { e: e, pointer: pointer });\n      this._handleEvent(e, 'down');\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mousemove\n     */\n    _onMouseMoveInDrawingMode: function(e) {\n      if (this._isCurrentlyDrawing) {\n        var pointer = this.getPointer(e);\n        this.freeDrawingBrush.onMouseMove(pointer, { e: e, pointer: pointer });\n      }\n      this.setCursor(this.freeDrawingCursor);\n      this._handleEvent(e, 'move');\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object fired on mouseup\n     */\n    _onMouseUpInDrawingMode: function(e) {\n      if (this.clipTo) {\n        this.contextTop.restore();\n      }\n      var pointer = this.getPointer(e);\n      this._isCurrentlyDrawing = this.freeDrawingBrush.onMouseUp({ e: e, pointer: pointer });\n      this._handleEvent(e, 'up');\n    },\n\n    /**\n     * Method that defines the actions when mouse is clicked on canvas.\n     * The method inits the currentTransform parameters and renders all the\n     * canvas so the current image can be placed on the top canvas and the rest\n     * in on the container one.\n     * @private\n     * @param {Event} e Event object fired on mousedown\n     */\n    __onMouseDown: function (e) {\n      this._cacheTransformEventData(e);\n      this._handleEvent(e, 'down:before');\n      var target = this._target;\n      // if right click just fire events\n      if (checkClick(e, RIGHT_CLICK)) {\n        if (this.fireRightClick) {\n          this._handleEvent(e, 'down', RIGHT_CLICK);\n        }\n        return;\n      }\n\n      if (checkClick(e, MIDDLE_CLICK)) {\n        if (this.fireMiddleClick) {\n          this._handleEvent(e, 'down', MIDDLE_CLICK);\n        }\n        return;\n      }\n\n      if (this.isDrawingMode) {\n        this._onMouseDownInDrawingMode(e);\n        return;\n      }\n\n      if (!this._isMainEvent(e)) {\n        return;\n      }\n\n      // ignore if some object is being transformed at this moment\n      if (this._currentTransform) {\n        return;\n      }\n\n      var pointer = this._pointer;\n      // save pointer for check in __onMouseUp event\n      this._previousPointer = pointer;\n      var shouldRender = this._shouldRender(target),\n          shouldGroup = this._shouldGroup(e, target);\n      if (this._shouldClearSelection(e, target)) {\n        this.discardActiveObject(e);\n      }\n      else if (shouldGroup) {\n        this._handleGrouping(e, target);\n        target = this._activeObject;\n      }\n\n      if (this.selection && (!target ||\n        (!target.selectable && !target.isEditing && target !== this._activeObject))) {\n        this._groupSelector = {\n          ex: pointer.x,\n          ey: pointer.y,\n          top: 0,\n          left: 0\n        };\n      }\n\n      if (target) {\n        var alreadySelected = target === this._activeObject;\n        if (target.selectable) {\n          this.setActiveObject(target, e);\n        }\n        if (target === this._activeObject && (target.__corner || !shouldGroup)) {\n          this._setupCurrentTransform(e, target, alreadySelected);\n        }\n      }\n      this._handleEvent(e, 'down');\n      // we must renderAll so that we update the visuals\n      (shouldRender || shouldGroup) && this.requestRenderAll();\n    },\n\n    /**\n     * reset cache form common information needed during event processing\n     * @private\n     */\n    _resetTransformEventData: function() {\n      this._target = null;\n      this._pointer = null;\n      this._absolutePointer = null;\n    },\n\n    /**\n     * Cache common information needed during event processing\n     * @private\n     * @param {Event} e Event object fired on event\n     */\n    _cacheTransformEventData: function(e) {\n      // reset in order to avoid stale caching\n      this._resetTransformEventData();\n      this._pointer = this.getPointer(e, true);\n      this._absolutePointer = this.restorePointerVpt(this._pointer);\n      this._target = this._currentTransform ? this._currentTransform.target : this.findTarget(e) || null;\n    },\n\n    /**\n     * @private\n     */\n    _beforeTransform: function(e) {\n      var t = this._currentTransform;\n      this.stateful && t.target.saveState();\n      this.fire('before:transform', {\n        e: e,\n        transform: t,\n      });\n      // determine if it's a drag or rotate case\n      if (t.corner) {\n        this.onBeforeScaleRotate(t.target);\n      }\n    },\n\n    /**\n     * Method that defines the actions when mouse is hovering the canvas.\n     * The currentTransform parameter will define whether the user is rotating/scaling/translating\n     * an image or neither of them (only hovering). A group selection is also possible and would cancel\n     * all any other type of action.\n     * In case of an image transformation only the top canvas will be rendered.\n     * @private\n     * @param {Event} e Event object fired on mousemove\n     */\n    __onMouseMove: function (e) {\n      this._handleEvent(e, 'move:before');\n      this._cacheTransformEventData(e);\n      var target, pointer;\n\n      if (this.isDrawingMode) {\n        this._onMouseMoveInDrawingMode(e);\n        return;\n      }\n\n      if (!this._isMainEvent(e)) {\n        return;\n      }\n\n      var groupSelector = this._groupSelector;\n\n      // We initially clicked in an empty area, so we draw a box for multiple selection\n      if (groupSelector) {\n        pointer = this._pointer;\n\n        groupSelector.left = pointer.x - groupSelector.ex;\n        groupSelector.top = pointer.y - groupSelector.ey;\n\n        this.renderTop();\n      }\n      else if (!this._currentTransform) {\n        target = this.findTarget(e) || null;\n        this._setCursorFromEvent(e, target);\n        this._fireOverOutEvents(target, e);\n      }\n      else {\n        this._transformObject(e);\n      }\n      this._handleEvent(e, 'move');\n      this._resetTransformEventData();\n    },\n\n    /**\n     * Manage the mouseout, mouseover events for the fabric object on the canvas\n     * @param {Fabric.Object} target the target where the target from the mousemove event\n     * @param {Event} e Event object fired on mousemove\n     * @private\n     */\n    _fireOverOutEvents: function(target, e) {\n      this.fireSyntheticInOutEvents(target, e, {\n        targetName: '_hoveredTarget',\n        canvasEvtOut: 'mouse:out',\n        evtOut: 'mouseout',\n        canvasEvtIn: 'mouse:over',\n        evtIn: 'mouseover',\n      });\n    },\n\n    /**\n     * Manage the dragEnter, dragLeave events for the fabric objects on the canvas\n     * @param {Fabric.Object} target the target where the target from the onDrag event\n     * @param {Event} e Event object fired on ondrag\n     * @private\n     */\n    _fireEnterLeaveEvents: function(target, e) {\n      this.fireSyntheticInOutEvents(target, e, {\n        targetName: '_draggedoverTarget',\n        evtOut: 'dragleave',\n        evtIn: 'dragenter',\n      });\n    },\n\n    /**\n     * Manage the synthetic in/out events for the fabric objects on the canvas\n     * @param {Fabric.Object} target the target where the target from the supported events\n     * @param {Event} e Event object fired\n     * @param {Object} config configuration for the function to work\n     * @param {String} config.targetName property on the canvas where the old target is stored\n     * @param {String} [config.canvasEvtOut] name of the event to fire at canvas level for out\n     * @param {String} config.evtOut name of the event to fire for out\n     * @param {String} [config.canvasEvtIn] name of the event to fire at canvas level for in\n     * @param {String} config.evtIn name of the event to fire for in\n     * @private\n     */\n    fireSyntheticInOutEvents: function(target, e, config) {\n      var inOpt, outOpt, oldTarget = this[config.targetName], outFires, inFires,\n          targetChanged = oldTarget !== target, canvasEvtIn = config.canvasEvtIn, canvasEvtOut = config.canvasEvtOut;\n      if (targetChanged) {\n        inOpt = { e: e, target: target, previousTarget: oldTarget };\n        outOpt = { e: e, target: oldTarget, nextTarget: target };\n        this[config.targetName] = target;\n      }\n      inFires = target && targetChanged;\n      outFires = oldTarget && targetChanged;\n      if (outFires) {\n        canvasEvtOut && this.fire(canvasEvtOut, outOpt);\n        oldTarget.fire(config.evtOut, outOpt);\n      }\n      if (inFires) {\n        canvasEvtIn && this.fire(canvasEvtIn, inOpt);\n        target.fire(config.evtIn, inOpt);\n      }\n    },\n\n    /**\n     * Method that defines actions when an Event Mouse Wheel\n     * @param {Event} e Event object fired on mouseup\n     */\n    __onMouseWheel: function(e) {\n      this._cacheTransformEventData(e);\n      this._handleEvent(e, 'wheel');\n      this._resetTransformEventData();\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event fired on mousemove\n     */\n    _transformObject: function(e) {\n      var pointer = this.getPointer(e),\n          transform = this._currentTransform;\n\n      transform.reset = false;\n      transform.target.isMoving = true;\n      transform.shiftKey = e.shiftKey;\n      transform.altKey = e[this.centeredKey];\n\n      this._beforeScaleTransform(e, transform);\n      this._performTransformAction(e, transform, pointer);\n\n      transform.actionPerformed && this.requestRenderAll();\n    },\n\n    /**\n     * @private\n     */\n    _performTransformAction: function(e, transform, pointer) {\n      var x = pointer.x,\n          y = pointer.y,\n          action = transform.action,\n          actionPerformed = false,\n          options = {\n            target: transform.target,\n            e: e,\n            transform: transform,\n            pointer: pointer\n          };\n\n      if (action === 'rotate') {\n        (actionPerformed = this._rotateObject(x, y)) && this._fire('rotating', options);\n      }\n      else if (action === 'scale') {\n        (actionPerformed = this._onScale(e, transform, x, y)) && this._fire('scaling', options);\n      }\n      else if (action === 'scaleX') {\n        (actionPerformed = this._scaleObject(x, y, 'x')) && this._fire('scaling', options);\n      }\n      else if (action === 'scaleY') {\n        (actionPerformed = this._scaleObject(x, y, 'y')) && this._fire('scaling', options);\n      }\n      else if (action === 'skewX') {\n        (actionPerformed = this._skewObject(x, y, 'x')) && this._fire('skewing', options);\n      }\n      else if (action === 'skewY') {\n        (actionPerformed = this._skewObject(x, y, 'y')) && this._fire('skewing', options);\n      }\n      else {\n        actionPerformed = this._translateObject(x, y);\n        if (actionPerformed) {\n          this._fire('moving', options);\n          this.setCursor(options.target.moveCursor || this.moveCursor);\n        }\n      }\n      transform.actionPerformed = transform.actionPerformed || actionPerformed;\n    },\n\n    /**\n     * @private\n     */\n    _fire: function(eventName, options) {\n      this.fire('object:' + eventName, options);\n      options.target.fire(eventName, options);\n    },\n\n    /**\n     * @private\n     */\n    _beforeScaleTransform: function(e, transform) {\n      if (transform.action === 'scale' || transform.action === 'scaleX' || transform.action === 'scaleY') {\n        var centerTransform = this._shouldCenterTransform(transform.target);\n\n        // Switch from a normal resize to center-based\n        if ((centerTransform && (transform.originX !== 'center' || transform.originY !== 'center')) ||\n           // Switch from center-based resize to normal one\n           (!centerTransform && transform.originX === 'center' && transform.originY === 'center')\n        ) {\n          this._resetCurrentTransform();\n          transform.reset = true;\n        }\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {Object} transform current transform\n     * @param {Number} x mouse position x from origin\n     * @param {Number} y mouse position y from origin\n     * @return {Boolean} true if the scaling occurred\n     */\n    _onScale: function(e, transform, x, y) {\n      if (this._isUniscalePossible(e, transform.target)) {\n        transform.currentAction = 'scale';\n        return this._scaleObject(x, y);\n      }\n      else {\n        // Switch from a normal resize to proportional\n        if (!transform.reset && transform.currentAction === 'scale') {\n          this._resetCurrentTransform();\n        }\n\n        transform.currentAction = 'scaleEqually';\n        return this._scaleObject(x, y, 'equally');\n      }\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {fabric.Object} target current target\n     * @return {Boolean} true if unproportional scaling is possible\n     */\n    _isUniscalePossible: function(e, target) {\n      return (e[this.uniScaleKey] || this.uniScaleTransform) && !target.get('lockUniScaling');\n    },\n\n    /**\n     * Sets the cursor depending on where the canvas is being hovered.\n     * Note: very buggy in Opera\n     * @param {Event} e Event object\n     * @param {Object} target Object that the mouse is hovering, if so.\n     */\n    _setCursorFromEvent: function (e, target) {\n      if (!target) {\n        this.setCursor(this.defaultCursor);\n        return false;\n      }\n      var hoverCursor = target.hoverCursor || this.hoverCursor,\n          activeSelection = this._activeObject && this._activeObject.type === 'activeSelection' ?\n            this._activeObject : null,\n          // only show proper corner when group selection is not active\n          corner = (!activeSelection || !activeSelection.contains(target))\n                    && target._findTargetCorner(this.getPointer(e, true));\n\n      if (!corner) {\n        this.setCursor(hoverCursor);\n      }\n      else {\n        this.setCursor(this.getCornerCursor(corner, target, e));\n      }\n    },\n\n    /**\n     * @private\n     */\n    getCornerCursor: function(corner, target, e) {\n      if (this.actionIsDisabled(corner, target, e)) {\n        return this.notAllowedCursor;\n      }\n      else if (corner in cursorOffset) {\n        return this._getRotatedCornerCursor(corner, target, e);\n      }\n      else if (corner === 'mtr' && target.hasRotatingPoint) {\n        return this.rotationCursor;\n      }\n      else {\n        return this.defaultCursor;\n      }\n    },\n\n    actionIsDisabled: function(corner, target, e) {\n      if (corner === 'mt' || corner === 'mb') {\n        return e[this.altActionKey] ? target.lockSkewingX : target.lockScalingY;\n      }\n      else if (corner === 'ml' || corner === 'mr') {\n        return e[this.altActionKey] ? target.lockSkewingY : target.lockScalingX;\n      }\n      else if (corner === 'mtr') {\n        return target.lockRotation;\n      }\n      else {\n        return this._isUniscalePossible(e, target) ?\n          target.lockScalingX && target.lockScalingY : target.lockScalingX || target.lockScalingY;\n      }\n    },\n\n    /**\n     * @private\n     */\n    _getRotatedCornerCursor: function(corner, target, e) {\n      var n = Math.round((target.angle % 360) / 45);\n\n      if (n < 0) {\n        n += 8; // full circle ahead\n      }\n      n += cursorOffset[corner];\n      if (e[this.altActionKey] && cursorOffset[corner] % 2 === 0) {\n        //if we are holding shift and we are on a mx corner...\n        n += 2;\n      }\n      // normalize n to be from 0 to 7\n      n %= 8;\n\n      return this.cursorMap[n];\n    }\n  });\n})();\n\n\n(function() {\n\n  var min = Math.min,\n      max = Math.max;\n\n  fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {fabric.Object} target\n     * @return {Boolean}\n     */\n    _shouldGroup: function(e, target) {\n      var activeObject = this._activeObject;\n      return activeObject && this._isSelectionKeyPressed(e) && target && target.selectable && this.selection &&\n            (activeObject !== target || activeObject.type === 'activeSelection') && !target.onSelect({ e: e });\n    },\n\n    /**\n     * @private\n     * @param {Event} e Event object\n     * @param {fabric.Object} target\n     */\n    _handleGrouping: function (e, target) {\n      var activeObject = this._activeObject;\n      // avoid multi select when shift click on a corner\n      if (activeObject.__corner) {\n        return;\n      }\n      if (target === activeObject) {\n        // if it's a group, find target again, using activeGroup objects\n        target = this.findTarget(e, true);\n        // if even object is not found or we are on activeObjectCorner, bail out\n        if (!target || !target.selectable) {\n          return;\n        }\n      }\n      if (activeObject && activeObject.type === 'activeSelection') {\n        this._updateActiveSelection(target, e);\n      }\n      else {\n        this._createActiveSelection(target, e);\n      }\n    },\n\n    /**\n     * @private\n     */\n    _updateActiveSelection: function(target, e) {\n      var activeSelection = this._activeObject,\n          currentActiveObjects = activeSelection._objects.slice(0);\n      if (activeSelection.contains(target)) {\n        activeSelection.removeWithUpdate(target);\n        this._hoveredTarget = target;\n        if (activeSelection.size() === 1) {\n          // activate last remaining object\n          this._setActiveObject(activeSelection.item(0), e);\n        }\n      }\n      else {\n        activeSelection.addWithUpdate(target);\n        this._hoveredTarget = activeSelection;\n      }\n      this._fireSelectionEvents(currentActiveObjects, e);\n    },\n\n    /**\n     * @private\n     */\n    _createActiveSelection: function(target, e) {\n      var currentActives = this.getActiveObjects(), group = this._createGroup(target);\n      this._hoveredTarget = group;\n      this._setActiveObject(group, e);\n      this._fireSelectionEvents(currentActives, e);\n    },\n\n    /**\n     * @private\n     * @param {Object} target\n     */\n    _createGroup: function(target) {\n      var objects = this._objects,\n          isActiveLower = objects.indexOf(this._activeObject) < objects.indexOf(target),\n          groupObjects = isActiveLower\n            ? [this._activeObject, target]\n            : [target, this._activeObject];\n      this._activeObject.isEditing && this._activeObject.exitEditing();\n      return new fabric.ActiveSelection(groupObjects, {\n        canvas: this\n      });\n    },\n\n    /**\n     * @private\n     * @param {Event} e mouse event\n     */\n    _groupSelectedObjects: function (e) {\n\n      var group = this._collectObjects(e),\n          aGroup;\n\n      // do not create group for 1 element only\n      if (group.length === 1) {\n        this.setActiveObject(group[0], e);\n      }\n      else if (group.length > 1) {\n        aGroup = new fabric.ActiveSelection(group.reverse(), {\n          canvas: this\n        });\n        this.setActiveObject(aGroup, e);\n      }\n    },\n\n    /**\n     * @private\n     */\n    _collectObjects: function(e) {\n      var group = [],\n          currentObject,\n          x1 = this._groupSelector.ex,\n          y1 = this._groupSelector.ey,\n          x2 = x1 + this._groupSelector.left,\n          y2 = y1 + this._groupSelector.top,\n          selectionX1Y1 = new fabric.Point(min(x1, x2), min(y1, y2)),\n          selectionX2Y2 = new fabric.Point(max(x1, x2), max(y1, y2)),\n          allowIntersect = !this.selectionFullyContained,\n          isClick = x1 === x2 && y1 === y2;\n      // we iterate reverse order to collect top first in case of click.\n      for (var i = this._objects.length; i--; ) {\n        currentObject = this._objects[i];\n\n        if (!currentObject || !currentObject.selectable || !currentObject.visible) {\n          continue;\n        }\n\n        if ((allowIntersect && currentObject.intersectsWithRect(selectionX1Y1, selectionX2Y2)) ||\n            currentObject.isContainedWithinRect(selectionX1Y1, selectionX2Y2) ||\n            (allowIntersect && currentObject.containsPoint(selectionX1Y1)) ||\n            (allowIntersect && currentObject.containsPoint(selectionX2Y2))\n        ) {\n          group.push(currentObject);\n          // only add one object if it's a click\n          if (isClick) {\n            break;\n          }\n        }\n      }\n\n      if (group.length > 1) {\n        group = group.filter(function(object) {\n          return !object.onSelect({ e: e });\n        });\n      }\n\n      return group;\n    },\n\n    /**\n     * @private\n     */\n    _maybeGroupObjects: function(e) {\n      if (this.selection && this._groupSelector) {\n        this._groupSelectedObjects(e);\n      }\n      this.setCursor(this.defaultCursor);\n      // clear selection and current transformation\n      this._groupSelector = null;\n    }\n  });\n\n})();\n\n\n(function () {\n  fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n    /**\n     * Exports canvas element to a dataurl image. Note that when multiplier is used, cropping is scaled appropriately\n     * @param {Object} [options] Options object\n     * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n     * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n     * @param {Number} [options.multiplier=1] Multiplier to scale by, to have consistent\n     * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n     * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n     * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n     * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n     * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 2.0.0\n     * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n     * @see {@link http://jsfiddle.net/fabricjs/NfZVb/|jsFiddle demo}\n     * @example <caption>Generate jpeg dataURL with lower quality</caption>\n     * var dataURL = canvas.toDataURL({\n     *   format: 'jpeg',\n     *   quality: 0.8\n     * });\n     * @example <caption>Generate cropped png dataURL (clipping of canvas)</caption>\n     * var dataURL = canvas.toDataURL({\n     *   format: 'png',\n     *   left: 100,\n     *   top: 100,\n     *   width: 200,\n     *   height: 200\n     * });\n     * @example <caption>Generate double scaled png dataURL</caption>\n     * var dataURL = canvas.toDataURL({\n     *   format: 'png',\n     *   multiplier: 2\n     * });\n     */\n    toDataURL: function (options) {\n      options || (options = { });\n\n      var format = options.format || 'png',\n          quality = options.quality || 1,\n          multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? this.getRetinaScaling() : 1),\n          canvasEl = this.toCanvasElement(multiplier, options);\n      return fabric.util.toDataURL(canvasEl, format, quality);\n    },\n\n    /**\n     * Create a new HTMLCanvas element painted with the current canvas content.\n     * No need to resize the actual one or repaint it.\n     * Will transfer object ownership to a new canvas, paint it, and set everything back.\n     * This is an intermediary step used to get to a dataUrl but also it is useful to\n     * create quick image copies of a canvas without passing for the dataUrl string\n     * @param {Number} [multiplier] a zoom factor.\n     * @param {Object} [cropping] Cropping informations\n     * @param {Number} [cropping.left] Cropping left offset.\n     * @param {Number} [cropping.top] Cropping top offset.\n     * @param {Number} [cropping.width] Cropping width.\n     * @param {Number} [cropping.height] Cropping height.\n     */\n    toCanvasElement: function(multiplier, cropping) {\n      multiplier = multiplier || 1;\n      cropping = cropping || { };\n      var scaledWidth = (cropping.width || this.width) * multiplier,\n          scaledHeight = (cropping.height || this.height) * multiplier,\n          zoom = this.getZoom(),\n          originalWidth = this.width,\n          originalHeight = this.height,\n          newZoom = zoom * multiplier,\n          vp = this.viewportTransform,\n          translateX = (vp[4] - (cropping.left || 0)) * multiplier,\n          translateY = (vp[5] - (cropping.top || 0)) * multiplier,\n          originalInteractive = this.interactive,\n          newVp = [newZoom, 0, 0, newZoom, translateX, translateY],\n          originalRetina = this.enableRetinaScaling,\n          canvasEl = fabric.util.createCanvasElement(),\n          originalContextTop = this.contextTop;\n      canvasEl.width = scaledWidth;\n      canvasEl.height = scaledHeight;\n      this.contextTop = null;\n      this.enableRetinaScaling = false;\n      this.interactive = false;\n      this.viewportTransform = newVp;\n      this.width = scaledWidth;\n      this.height = scaledHeight;\n      this.calcViewportBoundaries();\n      this.renderCanvas(canvasEl.getContext('2d'), this._objects);\n      this.viewportTransform = vp;\n      this.width = originalWidth;\n      this.height = originalHeight;\n      this.calcViewportBoundaries();\n      this.interactive = originalInteractive;\n      this.enableRetinaScaling = originalRetina;\n      this.contextTop = originalContextTop;\n      return canvasEl;\n    },\n  });\n\n})();\n\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n  /**\n   * Populates canvas with data from the specified dataless JSON.\n   * JSON format must conform to the one of {@link fabric.Canvas#toDatalessJSON}\n   * @deprecated since 1.2.2\n   * @param {String|Object} json JSON string or object\n   * @param {Function} callback Callback, invoked when json is parsed\n   *                            and corresponding objects (e.g: {@link fabric.Image})\n   *                            are initialized\n   * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.\n   * @return {fabric.Canvas} instance\n   * @chainable\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}\n   */\n  loadFromDatalessJSON: function (json, callback, reviver) {\n    return this.loadFromJSON(json, callback, reviver);\n  },\n\n  /**\n   * Populates canvas with data from the specified JSON.\n   * JSON format must conform to the one of {@link fabric.Canvas#toJSON}\n   * @param {String|Object} json JSON string or object\n   * @param {Function} callback Callback, invoked when json is parsed\n   *                            and corresponding objects (e.g: {@link fabric.Image})\n   *                            are initialized\n   * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.\n   * @return {fabric.Canvas} instance\n   * @chainable\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}\n   * @see {@link http://jsfiddle.net/fabricjs/fmgXt/|jsFiddle demo}\n   * @example <caption>loadFromJSON</caption>\n   * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas));\n   * @example <caption>loadFromJSON with reviver</caption>\n   * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas), function(o, object) {\n   *   // `o` = json object\n   *   // `object` = fabric.Object instance\n   *   // ... do some stuff ...\n   * });\n   */\n  loadFromJSON: function (json, callback, reviver) {\n    if (!json) {\n      return;\n    }\n\n    // serialize if it wasn't already\n    var serialized = (typeof json === 'string')\n      ? JSON.parse(json)\n      : fabric.util.object.clone(json);\n\n    var _this = this,\n        clipPath = serialized.clipPath,\n        renderOnAddRemove = this.renderOnAddRemove;\n\n    this.renderOnAddRemove = false;\n\n    delete serialized.clipPath;\n\n    this._enlivenObjects(serialized.objects, function (enlivenedObjects) {\n      _this.clear();\n      _this._setBgOverlay(serialized, function () {\n        if (clipPath) {\n          _this._enlivenObjects([clipPath], function (enlivenedCanvasClip) {\n            _this.clipPath = enlivenedCanvasClip[0];\n            _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n          });\n        }\n        else {\n          _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n        }\n      });\n    }, reviver);\n    return this;\n  },\n\n  /**\n   * @private\n   * @param {Object} serialized Object with background and overlay information\n   * @param {Array} restored canvas objects\n   * @param {Function} cached renderOnAddRemove callback\n   * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n   */\n  __setupCanvas: function(serialized, enlivenedObjects, renderOnAddRemove, callback) {\n    var _this = this;\n    enlivenedObjects.forEach(function(obj, index) {\n      // we splice the array just in case some custom classes restored from JSON\n      // will add more object to canvas at canvas init.\n      _this.insertAt(obj, index);\n    });\n    this.renderOnAddRemove = renderOnAddRemove;\n    // remove parts i cannot set as options\n    delete serialized.objects;\n    delete serialized.backgroundImage;\n    delete serialized.overlayImage;\n    delete serialized.background;\n    delete serialized.overlay;\n    // this._initOptions does too many things to just\n    // call it. Normally loading an Object from JSON\n    // create the Object instance. Here the Canvas is\n    // already an instance and we are just loading things over it\n    this._setOptions(serialized);\n    this.renderAll();\n    callback && callback();\n  },\n\n  /**\n   * @private\n   * @param {Object} serialized Object with background and overlay information\n   * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n   */\n  _setBgOverlay: function(serialized, callback) {\n    var loaded = {\n      backgroundColor: false,\n      overlayColor: false,\n      backgroundImage: false,\n      overlayImage: false\n    };\n\n    if (!serialized.backgroundImage && !serialized.overlayImage && !serialized.background && !serialized.overlay) {\n      callback && callback();\n      return;\n    }\n\n    var cbIfLoaded = function () {\n      if (loaded.backgroundImage && loaded.overlayImage && loaded.backgroundColor && loaded.overlayColor) {\n        callback && callback();\n      }\n    };\n\n    this.__setBgOverlay('backgroundImage', serialized.backgroundImage, loaded, cbIfLoaded);\n    this.__setBgOverlay('overlayImage', serialized.overlayImage, loaded, cbIfLoaded);\n    this.__setBgOverlay('backgroundColor', serialized.background, loaded, cbIfLoaded);\n    this.__setBgOverlay('overlayColor', serialized.overlay, loaded, cbIfLoaded);\n  },\n\n  /**\n   * @private\n   * @param {String} property Property to set (backgroundImage, overlayImage, backgroundColor, overlayColor)\n   * @param {(Object|String)} value Value to set\n   * @param {Object} loaded Set loaded property to true if property is set\n   * @param {Object} callback Callback function to invoke after property is set\n   */\n  __setBgOverlay: function(property, value, loaded, callback) {\n    var _this = this;\n\n    if (!value) {\n      loaded[property] = true;\n      callback && callback();\n      return;\n    }\n\n    if (property === 'backgroundImage' || property === 'overlayImage') {\n      fabric.util.enlivenObjects([value], function(enlivedObject){\n        _this[property] = enlivedObject[0];\n        loaded[property] = true;\n        callback && callback();\n      });\n    }\n    else {\n      this['set' + fabric.util.string.capitalize(property, true)](value, function() {\n        loaded[property] = true;\n        callback && callback();\n      });\n    }\n  },\n\n  /**\n   * @private\n   * @param {Array} objects\n   * @param {Function} callback\n   * @param {Function} [reviver]\n   */\n  _enlivenObjects: function (objects, callback, reviver) {\n    if (!objects || objects.length === 0) {\n      callback && callback([]);\n      return;\n    }\n\n    fabric.util.enlivenObjects(objects, function(enlivenedObjects) {\n      callback && callback(enlivenedObjects);\n    }, null, reviver);\n  },\n\n  /**\n   * @private\n   * @param {String} format\n   * @param {Function} callback\n   */\n  _toDataURL: function (format, callback) {\n    this.clone(function (clone) {\n      callback(clone.toDataURL(format));\n    });\n  },\n\n  /**\n   * @private\n   * @param {String} format\n   * @param {Number} multiplier\n   * @param {Function} callback\n   */\n  _toDataURLWithMultiplier: function (format, multiplier, callback) {\n    this.clone(function (clone) {\n      callback(clone.toDataURLWithMultiplier(format, multiplier));\n    });\n  },\n\n  /**\n   * Clones canvas instance\n   * @param {Object} [callback] Receives cloned instance as a first argument\n   * @param {Array} [properties] Array of properties to include in the cloned canvas and children\n   */\n  clone: function (callback, properties) {\n    var data = JSON.stringify(this.toJSON(properties));\n    this.cloneWithoutData(function(clone) {\n      clone.loadFromJSON(data, function() {\n        callback && callback(clone);\n      });\n    });\n  },\n\n  /**\n   * Clones canvas instance without cloning existing data.\n   * This essentially copies canvas dimensions, clipping properties, etc.\n   * but leaves data empty (so that you can populate it with your own)\n   * @param {Object} [callback] Receives cloned instance as a first argument\n   */\n  cloneWithoutData: function(callback) {\n    var el = fabric.util.createCanvasElement();\n\n    el.width = this.width;\n    el.height = this.height;\n\n    var clone = new fabric.Canvas(el);\n    clone.clipTo = this.clipTo;\n    if (this.backgroundImage) {\n      clone.setBackgroundImage(this.backgroundImage.src, function() {\n        clone.renderAll();\n        callback && callback(clone);\n      });\n      clone.backgroundImageOpacity = this.backgroundImageOpacity;\n      clone.backgroundImageStretch = this.backgroundImageStretch;\n    }\n    else {\n      callback && callback(clone);\n    }\n  }\n});\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      extend = fabric.util.object.extend,\n      clone = fabric.util.object.clone,\n      toFixed = fabric.util.toFixed,\n      capitalize = fabric.util.string.capitalize,\n      degreesToRadians = fabric.util.degreesToRadians,\n      supportsLineDash = fabric.StaticCanvas.supports('setLineDash'),\n      objectCaching = !fabric.isLikelyNode,\n      ALIASING_LIMIT = 2;\n\n  if (fabric.Object) {\n    return;\n  }\n\n  /**\n   * Root object class from which all 2d shape classes inherit from\n   * @class fabric.Object\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#objects}\n   * @see {@link fabric.Object#initialize} for constructor definition\n   *\n   * @fires added\n   * @fires removed\n   *\n   * @fires selected\n   * @fires deselected\n   * @fires modified\n   * @fires modified\n   * @fires moved\n   * @fires scaled\n   * @fires rotated\n   * @fires skewed\n   *\n   * @fires rotating\n   * @fires scaling\n   * @fires moving\n   * @fires skewing\n   *\n   * @fires mousedown\n   * @fires mouseup\n   * @fires mouseover\n   * @fires mouseout\n   * @fires mousewheel\n   * @fires mousedblclick\n   *\n   * @fires dragover\n   * @fires dragenter\n   * @fires dragleave\n   * @fires drop\n   */\n  fabric.Object = fabric.util.createClass(fabric.CommonMethods, /** @lends fabric.Object.prototype */ {\n\n    /**\n     * Type of an object (rect, circle, path, etc.).\n     * Note that this property is meant to be read-only and not meant to be modified.\n     * If you modify, certain parts of Fabric (such as JSON loading) won't work correctly.\n     * @type String\n     * @default\n     */\n    type:                     'object',\n\n    /**\n     * Horizontal origin of transformation of an object (one of \"left\", \"right\", \"center\")\n     * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n     * @type String\n     * @default\n     */\n    originX:                  'left',\n\n    /**\n     * Vertical origin of transformation of an object (one of \"top\", \"bottom\", \"center\")\n     * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n     * @type String\n     * @default\n     */\n    originY:                  'top',\n\n    /**\n     * Top position of an object. Note that by default it's relative to object top. You can change this by setting originY={top/center/bottom}\n     * @type Number\n     * @default\n     */\n    top:                      0,\n\n    /**\n     * Left position of an object. Note that by default it's relative to object left. You can change this by setting originX={left/center/right}\n     * @type Number\n     * @default\n     */\n    left:                     0,\n\n    /**\n     * Object width\n     * @type Number\n     * @default\n     */\n    width:                    0,\n\n    /**\n     * Object height\n     * @type Number\n     * @default\n     */\n    height:                   0,\n\n    /**\n     * Object scale factor (horizontal)\n     * @type Number\n     * @default\n     */\n    scaleX:                   1,\n\n    /**\n     * Object scale factor (vertical)\n     * @type Number\n     * @default\n     */\n    scaleY:                   1,\n\n    /**\n     * When true, an object is rendered as flipped horizontally\n     * @type Boolean\n     * @default\n     */\n    flipX:                    false,\n\n    /**\n     * When true, an object is rendered as flipped vertically\n     * @type Boolean\n     * @default\n     */\n    flipY:                    false,\n\n    /**\n     * Opacity of an object\n     * @type Number\n     * @default\n     */\n    opacity:                  1,\n\n    /**\n     * Angle of rotation of an object (in degrees)\n     * @type Number\n     * @default\n     */\n    angle:                    0,\n\n    /**\n     * Angle of skew on x axes of an object (in degrees)\n     * @type Number\n     * @default\n     */\n    skewX:                    0,\n\n    /**\n     * Angle of skew on y axes of an object (in degrees)\n     * @type Number\n     * @default\n     */\n    skewY:                    0,\n\n    /**\n     * Size of object's controlling corners (in pixels)\n     * @type Number\n     * @default\n     */\n    cornerSize:               13,\n\n    /**\n     * When true, object's controlling corners are rendered as transparent inside (i.e. stroke instead of fill)\n     * @type Boolean\n     * @default\n     */\n    transparentCorners:       true,\n\n    /**\n     * Default cursor value used when hovering over this object on canvas\n     * @type String\n     * @default\n     */\n    hoverCursor:              null,\n\n    /**\n     * Default cursor value used when moving this object on canvas\n     * @type String\n     * @default\n     */\n    moveCursor:               null,\n\n    /**\n     * Padding between object and its controlling borders (in pixels)\n     * @type Number\n     * @default\n     */\n    padding:                  0,\n\n    /**\n     * Color of controlling borders of an object (when it's active)\n     * @type String\n     * @default\n     */\n    borderColor:              'rgba(102,153,255,0.75)',\n\n    /**\n     * Array specifying dash pattern of an object's borders (hasBorder must be true)\n     * @since 1.6.2\n     * @type Array\n     */\n    borderDashArray:          null,\n\n    /**\n     * Color of controlling corners of an object (when it's active)\n     * @type String\n     * @default\n     */\n    cornerColor:              'rgba(102,153,255,0.5)',\n\n    /**\n     * Color of controlling corners of an object (when it's active and transparentCorners false)\n     * @since 1.6.2\n     * @type String\n     * @default\n     */\n    cornerStrokeColor:        null,\n\n    /**\n     * Specify style of control, 'rect' or 'circle'\n     * @since 1.6.2\n     * @type String\n     */\n    cornerStyle:          'rect',\n\n    /**\n     * Array specifying dash pattern of an object's control (hasBorder must be true)\n     * @since 1.6.2\n     * @type Array\n     */\n    cornerDashArray:          null,\n\n    /**\n     * When true, this object will use center point as the origin of transformation\n     * when being scaled via the controls.\n     * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n     * @since 1.3.4\n     * @type Boolean\n     * @default\n     */\n    centeredScaling:          false,\n\n    /**\n     * When true, this object will use center point as the origin of transformation\n     * when being rotated via the controls.\n     * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n     * @since 1.3.4\n     * @type Boolean\n     * @default\n     */\n    centeredRotation:         true,\n\n    /**\n     * Color of object's fill\n     * takes css colors https://www.w3.org/TR/css-color-3/\n     * @type String\n     * @default\n     */\n    fill:                     'rgb(0,0,0)',\n\n    /**\n     * Fill rule used to fill an object\n     * accepted values are nonzero, evenodd\n     * <b>Backwards incompatibility note:</b> This property was used for setting globalCompositeOperation until v1.4.12 (use `fabric.Object#globalCompositeOperation` instead)\n     * @type String\n     * @default\n     */\n    fillRule:                 'nonzero',\n\n    /**\n     * Composite rule used for canvas globalCompositeOperation\n     * @type String\n     * @default\n     */\n    globalCompositeOperation: 'source-over',\n\n    /**\n     * Background color of an object.\n     * takes css colors https://www.w3.org/TR/css-color-3/\n     * @type String\n     * @default\n     */\n    backgroundColor:          '',\n\n    /**\n     * Selection Background color of an object. colored layer behind the object when it is active.\n     * does not mix good with globalCompositeOperation methods.\n     * @type String\n     * @default\n     */\n    selectionBackgroundColor:          '',\n\n    /**\n     * When defined, an object is rendered via stroke and this property specifies its color\n     * takes css colors https://www.w3.org/TR/css-color-3/\n     * @type String\n     * @default\n     */\n    stroke:                   null,\n\n    /**\n     * Width of a stroke used to render this object\n     * @type Number\n     * @default\n     */\n    strokeWidth:              1,\n\n    /**\n     * Array specifying dash pattern of an object's stroke (stroke must be defined)\n     * @type Array\n     */\n    strokeDashArray:          null,\n\n    /**\n     * Line offset of an object's stroke\n     * @type Number\n     * @default\n     */\n    strokeDashOffset: 0,\n\n    /**\n     * Line endings style of an object's stroke (one of \"butt\", \"round\", \"square\")\n     * @type String\n     * @default\n     */\n    strokeLineCap:            'butt',\n\n    /**\n     * Corner style of an object's stroke (one of \"bevil\", \"round\", \"miter\")\n     * @type String\n     * @default\n     */\n    strokeLineJoin:           'miter',\n\n    /**\n     * Maximum miter length (used for strokeLineJoin = \"miter\") of an object's stroke\n     * @type Number\n     * @default\n     */\n    strokeMiterLimit:         4,\n\n    /**\n     * Shadow object representing shadow of this shape\n     * @type fabric.Shadow\n     * @default\n     */\n    shadow:                   null,\n\n    /**\n     * Opacity of object's controlling borders when object is active and moving\n     * @type Number\n     * @default\n     */\n    borderOpacityWhenMoving:  0.4,\n\n    /**\n     * Scale factor of object's controlling borders\n     * @type Number\n     * @default\n     */\n    borderScaleFactor:        1,\n\n    /**\n     * Transform matrix (similar to SVG's transform matrix)\n     * This property has been depreacted. Since caching and and qrDecompose this\n     * property can be handled with the standard top,left,scaleX,scaleY,angle and skewX.\n     * A documentation example on how to parse and merge a transformMatrix will be provided before\n     * completely removing it in fabric 4.0\n     * If you are starting a project now, DO NOT use it.\n     * @deprecated since 3.2.0\n     * @type Array\n     */\n    transformMatrix:          null,\n\n    /**\n     * Minimum allowed scale value of an object\n     * @type Number\n     * @default\n     */\n    minScaleLimit:            0,\n\n    /**\n     * When set to `false`, an object can not be selected for modification (using either point-click-based or group-based selection).\n     * But events still fire on it.\n     * @type Boolean\n     * @default\n     */\n    selectable:               true,\n\n    /**\n     * When set to `false`, an object can not be a target of events. All events propagate through it. Introduced in v1.3.4\n     * @type Boolean\n     * @default\n     */\n    evented:                  true,\n\n    /**\n     * When set to `false`, an object is not rendered on canvas\n     * @type Boolean\n     * @default\n     */\n    visible:                  true,\n\n    /**\n     * When set to `false`, object's controls are not displayed and can not be used to manipulate object\n     * @type Boolean\n     * @default\n     */\n    hasControls:              true,\n\n    /**\n     * When set to `false`, object's controlling borders are not rendered\n     * @type Boolean\n     * @default\n     */\n    hasBorders:               true,\n\n    /**\n     * When set to `false`, object's controlling rotating point will not be visible or selectable\n     * @type Boolean\n     * @default\n     */\n    hasRotatingPoint:         true,\n\n    /**\n     * Offset for object's controlling rotating point (when enabled via `hasRotatingPoint`)\n     * @type Number\n     * @default\n     */\n    rotatingPointOffset:      40,\n\n    /**\n     * When set to `true`, objects are \"found\" on canvas on per-pixel basis rather than according to bounding box\n     * @type Boolean\n     * @default\n     */\n    perPixelTargetFind:       false,\n\n    /**\n     * When `false`, default object's values are not included in its serialization\n     * @type Boolean\n     * @default\n     */\n    includeDefaultValues:     true,\n\n    /**\n     * Function that determines clipping of an object (context is passed as a first argument).\n     * If you are using code minification, ctx argument can be minified/manglied you should use\n     * as a workaround `var ctx = arguments[0];` in the function;\n     * Note that context origin is at the object's center point (not left/top corner)\n     * @deprecated since 2.0.0\n     * @type Function\n     */\n    clipTo:                   null,\n\n    /**\n     * When `true`, object horizontal movement is locked\n     * @type Boolean\n     * @default\n     */\n    lockMovementX:            false,\n\n    /**\n     * When `true`, object vertical movement is locked\n     * @type Boolean\n     * @default\n     */\n    lockMovementY:            false,\n\n    /**\n     * When `true`, object rotation is locked\n     * @type Boolean\n     * @default\n     */\n    lockRotation:             false,\n\n    /**\n     * When `true`, object horizontal scaling is locked\n     * @type Boolean\n     * @default\n     */\n    lockScalingX:             false,\n\n    /**\n     * When `true`, object vertical scaling is locked\n     * @type Boolean\n     * @default\n     */\n    lockScalingY:             false,\n\n    /**\n     * When `true`, object non-uniform scaling is locked\n     * @type Boolean\n     * @default\n     */\n    lockUniScaling:           false,\n\n    /**\n     * When `true`, object horizontal skewing is locked\n     * @type Boolean\n     * @default\n     */\n    lockSkewingX:             false,\n\n    /**\n     * When `true`, object vertical skewing is locked\n     * @type Boolean\n     * @default\n     */\n    lockSkewingY:             false,\n\n    /**\n     * When `true`, object cannot be flipped by scaling into negative values\n     * @type Boolean\n     * @default\n     */\n    lockScalingFlip:          false,\n\n    /**\n     * When `true`, object is not exported in OBJECT/JSON\n     * @since 1.6.3\n     * @type Boolean\n     * @default\n     */\n    excludeFromExport:        false,\n\n    /**\n     * When `true`, object is cached on an additional canvas.\n     * When `false`, object is not cached unless necessary ( clipPath )\n     * default to true\n     * @since 1.7.0\n     * @type Boolean\n     * @default true\n     */\n    objectCaching:            objectCaching,\n\n    /**\n     * When `true`, object properties are checked for cache invalidation. In some particular\n     * situation you may want this to be disabled ( spray brush, very big, groups)\n     * or if your application does not allow you to modify properties for groups child you want\n     * to disable it for groups.\n     * default to false\n     * since 1.7.0\n     * @type Boolean\n     * @default false\n     */\n    statefullCache:            false,\n\n    /**\n     * When `true`, cache does not get updated during scaling. The picture will get blocky if scaled\n     * too much and will be redrawn with correct details at the end of scaling.\n     * this setting is performance and application dependant.\n     * default to true\n     * since 1.7.0\n     * @type Boolean\n     * @default true\n     */\n    noScaleCache:              true,\n\n    /**\n     * When `false`, the stoke width will scale with the object.\n     * When `true`, the stroke will always match the exact pixel size entered for stroke width.\n     * default to false\n     * @since 2.6.0\n     * @type Boolean\n     * @default false\n     * @type Boolean\n     * @default false\n     */\n    strokeUniform:              false,\n\n    /**\n     * When set to `true`, object's cache will be rerendered next render call.\n     * since 1.7.0\n     * @type Boolean\n     * @default true\n     */\n    dirty:                true,\n\n    /**\n     * keeps the value of the last hovered corner during mouse move.\n     * 0 is no corner, or 'mt', 'ml', 'mtr' etc..\n     * It should be private, but there is no harm in using it as\n     * a read-only property.\n     * @type number|string|any\n     * @default 0\n     */\n    __corner: 0,\n\n    /**\n     * Determines if the fill or the stroke is drawn first (one of \"fill\" or \"stroke\")\n     * @type String\n     * @default\n     */\n    paintFirst:           'fill',\n\n    /**\n     * List of properties to consider when checking if state\n     * of an object is changed (fabric.Object#hasStateChanged)\n     * as well as for history (undo/redo) purposes\n     * @type Array\n     */\n    stateProperties: (\n      'top left width height scaleX scaleY flipX flipY originX originY transformMatrix ' +\n      'stroke strokeWidth strokeDashArray strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit ' +\n      'angle opacity fill globalCompositeOperation shadow clipTo visible backgroundColor ' +\n      'skewX skewY fillRule paintFirst clipPath strokeUniform'\n    ).split(' '),\n\n    /**\n     * List of properties to consider when checking if cache needs refresh\n     * Those properties are checked by statefullCache ON ( or lazy mode if we want ) or from single\n     * calls to Object.set(key, value). If the key is in this list, the object is marked as dirty\n     * and refreshed at the next render\n     * @type Array\n     */\n    cacheProperties: (\n      'fill stroke strokeWidth strokeDashArray width height paintFirst strokeUniform' +\n      ' strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit backgroundColor clipPath'\n    ).split(' '),\n\n    /**\n     * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n     * the clipPath object gets used when the object has rendered, and the context is placed in the center\n     * of the object cacheCanvas.\n     * If you want 0,0 of a clipPath to align with an object center, use clipPath.originX/Y to 'center'\n     * @type fabric.Object\n     */\n    clipPath: undefined,\n\n    /**\n     * Meaningful ONLY when the object is used as clipPath.\n     * if true, the clipPath will make the object clip to the outside of the clipPath\n     * since 2.4.0\n     * @type boolean\n     * @default false\n     */\n    inverted: false,\n\n    /**\n     * Meaningful ONLY when the object is used as clipPath.\n     * if true, the clipPath will have its top and left relative to canvas, and will\n     * not be influenced by the object transform. This will make the clipPath relative\n     * to the canvas, but clipping just a particular object.\n     * WARNING this is beta, this feature may change or be renamed.\n     * since 2.4.0\n     * @type boolean\n     * @default false\n     */\n    absolutePositioned: false,\n\n    /**\n     * Constructor\n     * @param {Object} [options] Options object\n     */\n    initialize: function(options) {\n      if (options) {\n        this.setOptions(options);\n      }\n    },\n\n    /**\n     * Create a the canvas used to keep the cached copy of the object\n     * @private\n     */\n    _createCacheCanvas: function() {\n      this._cacheProperties = {};\n      this._cacheCanvas = fabric.util.createCanvasElement();\n      this._cacheContext = this._cacheCanvas.getContext('2d');\n      this._updateCacheCanvas();\n      // if canvas gets created, is empty, so dirty.\n      this.dirty = true;\n    },\n\n    /**\n     * Limit the cache dimensions so that X * Y do not cross fabric.perfLimitSizeTotal\n     * and each side do not cross fabric.cacheSideLimit\n     * those numbers are configurable so that you can get as much detail as you want\n     * making bargain with performances.\n     * @param {Object} dims\n     * @param {Object} dims.width width of canvas\n     * @param {Object} dims.height height of canvas\n     * @param {Object} dims.zoomX zoomX zoom value to unscale the canvas before drawing cache\n     * @param {Object} dims.zoomY zoomY zoom value to unscale the canvas before drawing cache\n     * @return {Object}.width width of canvas\n     * @return {Object}.height height of canvas\n     * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n     * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n     */\n    _limitCacheSize: function(dims) {\n      var perfLimitSizeTotal = fabric.perfLimitSizeTotal,\n          width = dims.width, height = dims.height,\n          max = fabric.maxCacheSideLimit, min = fabric.minCacheSideLimit;\n      if (width <= max && height <= max && width * height <= perfLimitSizeTotal) {\n        if (width < min) {\n          dims.width = min;\n        }\n        if (height < min) {\n          dims.height = min;\n        }\n        return dims;\n      }\n      var ar = width / height, limitedDims = fabric.util.limitDimsByArea(ar, perfLimitSizeTotal),\n          capValue = fabric.util.capValue,\n          x = capValue(min, limitedDims.x, max),\n          y = capValue(min, limitedDims.y, max);\n      if (width > x) {\n        dims.zoomX /= width / x;\n        dims.width = x;\n        dims.capped = true;\n      }\n      if (height > y) {\n        dims.zoomY /= height / y;\n        dims.height = y;\n        dims.capped = true;\n      }\n      return dims;\n    },\n\n    /**\n     * Return the dimension and the zoom level needed to create a cache canvas\n     * big enough to host the object to be cached.\n     * @private\n     * @return {Object}.x width of object to be cached\n     * @return {Object}.y height of object to be cached\n     * @return {Object}.width width of canvas\n     * @return {Object}.height height of canvas\n     * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n     * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n     */\n    _getCacheCanvasDimensions: function() {\n      var objectScale = this.getTotalObjectScaling(),\n          // caculate dimensions without skewing\n          dim = this._getTransformedDimensions(0, 0),\n          neededX = dim.x * objectScale.scaleX / this.scaleX,\n          neededY = dim.y * objectScale.scaleY / this.scaleY;\n      return {\n        // for sure this ALIASING_LIMIT is slightly creating problem\n        // in situation in which the cache canvas gets an upper limit\n        // also objectScale contains already scaleX and scaleY\n        width: neededX + ALIASING_LIMIT,\n        height: neededY + ALIASING_LIMIT,\n        zoomX: objectScale.scaleX,\n        zoomY: objectScale.scaleY,\n        x: neededX,\n        y: neededY\n      };\n    },\n\n    /**\n     * Update width and height of the canvas for cache\n     * returns true or false if canvas needed resize.\n     * @private\n     * @return {Boolean} true if the canvas has been resized\n     */\n    _updateCacheCanvas: function() {\n      var targetCanvas = this.canvas;\n      if (this.noScaleCache && targetCanvas && targetCanvas._currentTransform) {\n        var target = targetCanvas._currentTransform.target,\n            action = targetCanvas._currentTransform.action;\n        if (this === target && action.slice && action.slice(0, 5) === 'scale') {\n          return false;\n        }\n      }\n      var canvas = this._cacheCanvas,\n          dims = this._limitCacheSize(this._getCacheCanvasDimensions()),\n          minCacheSize = fabric.minCacheSideLimit,\n          width = dims.width, height = dims.height, drawingWidth, drawingHeight,\n          zoomX = dims.zoomX, zoomY = dims.zoomY,\n          dimensionsChanged = width !== this.cacheWidth || height !== this.cacheHeight,\n          zoomChanged = this.zoomX !== zoomX || this.zoomY !== zoomY,\n          shouldRedraw = dimensionsChanged || zoomChanged,\n          additionalWidth = 0, additionalHeight = 0, shouldResizeCanvas = false;\n      if (dimensionsChanged) {\n        var canvasWidth = this._cacheCanvas.width,\n            canvasHeight = this._cacheCanvas.height,\n            sizeGrowing = width > canvasWidth || height > canvasHeight,\n            sizeShrinking = (width < canvasWidth * 0.9 || height < canvasHeight * 0.9) &&\n              canvasWidth > minCacheSize && canvasHeight > minCacheSize;\n        shouldResizeCanvas = sizeGrowing || sizeShrinking;\n        if (sizeGrowing && !dims.capped && (width > minCacheSize || height > minCacheSize)) {\n          additionalWidth = width * 0.1;\n          additionalHeight = height * 0.1;\n        }\n      }\n      if (shouldRedraw) {\n        if (shouldResizeCanvas) {\n          canvas.width = Math.ceil(width + additionalWidth);\n          canvas.height = Math.ceil(height + additionalHeight);\n        }\n        else {\n          this._cacheContext.setTransform(1, 0, 0, 1, 0, 0);\n          this._cacheContext.clearRect(0, 0, canvas.width, canvas.height);\n        }\n        drawingWidth = dims.x / 2;\n        drawingHeight = dims.y / 2;\n        this.cacheTranslationX = Math.round(canvas.width / 2 - drawingWidth) + drawingWidth;\n        this.cacheTranslationY = Math.round(canvas.height / 2 - drawingHeight) + drawingHeight;\n        this.cacheWidth = width;\n        this.cacheHeight = height;\n        this._cacheContext.translate(this.cacheTranslationX, this.cacheTranslationY);\n        this._cacheContext.scale(zoomX, zoomY);\n        this.zoomX = zoomX;\n        this.zoomY = zoomY;\n        return true;\n      }\n      return false;\n    },\n\n    /**\n     * Sets object's properties from options\n     * @param {Object} [options] Options object\n     */\n    setOptions: function(options) {\n      this._setOptions(options);\n      this._initGradient(options.fill, 'fill');\n      this._initGradient(options.stroke, 'stroke');\n      this._initClipping(options);\n      this._initPattern(options.fill, 'fill');\n      this._initPattern(options.stroke, 'stroke');\n    },\n\n    /**\n     * Transforms context when rendering an object\n     * @param {CanvasRenderingContext2D} ctx Context\n     */\n    transform: function(ctx) {\n      var m;\n      if (this.group && !this.group._transformDone) {\n        m = this.calcTransformMatrix();\n      }\n      else {\n        m = this.calcOwnMatrix();\n      }\n      ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n    },\n\n    /**\n     * Returns an object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} Object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n\n          object = {\n            type:                     this.type,\n            version:                  fabric.version,\n            originX:                  this.originX,\n            originY:                  this.originY,\n            left:                     toFixed(this.left, NUM_FRACTION_DIGITS),\n            top:                      toFixed(this.top, NUM_FRACTION_DIGITS),\n            width:                    toFixed(this.width, NUM_FRACTION_DIGITS),\n            height:                   toFixed(this.height, NUM_FRACTION_DIGITS),\n            fill:                     (this.fill && this.fill.toObject) ? this.fill.toObject() : this.fill,\n            stroke:                   (this.stroke && this.stroke.toObject) ? this.stroke.toObject() : this.stroke,\n            strokeWidth:              toFixed(this.strokeWidth, NUM_FRACTION_DIGITS),\n            strokeDashArray:          this.strokeDashArray ? this.strokeDashArray.concat() : this.strokeDashArray,\n            strokeLineCap:            this.strokeLineCap,\n            strokeDashOffset:         this.strokeDashOffset,\n            strokeLineJoin:           this.strokeLineJoin,\n            strokeMiterLimit:         toFixed(this.strokeMiterLimit, NUM_FRACTION_DIGITS),\n            scaleX:                   toFixed(this.scaleX, NUM_FRACTION_DIGITS),\n            scaleY:                   toFixed(this.scaleY, NUM_FRACTION_DIGITS),\n            angle:                    toFixed(this.angle, NUM_FRACTION_DIGITS),\n            flipX:                    this.flipX,\n            flipY:                    this.flipY,\n            opacity:                  toFixed(this.opacity, NUM_FRACTION_DIGITS),\n            shadow:                   (this.shadow && this.shadow.toObject) ? this.shadow.toObject() : this.shadow,\n            visible:                  this.visible,\n            clipTo:                   this.clipTo && String(this.clipTo),\n            backgroundColor:          this.backgroundColor,\n            fillRule:                 this.fillRule,\n            paintFirst:               this.paintFirst,\n            globalCompositeOperation: this.globalCompositeOperation,\n            transformMatrix:          this.transformMatrix ? this.transformMatrix.concat() : null,\n            skewX:                    toFixed(this.skewX, NUM_FRACTION_DIGITS),\n            skewY:                    toFixed(this.skewY, NUM_FRACTION_DIGITS),\n          };\n\n      if (this.clipPath) {\n        object.clipPath = this.clipPath.toObject(propertiesToInclude);\n        object.clipPath.inverted = this.clipPath.inverted;\n        object.clipPath.absolutePositioned = this.clipPath.absolutePositioned;\n      }\n\n      fabric.util.populateWithProperties(this, object, propertiesToInclude);\n      if (!this.includeDefaultValues) {\n        object = this._removeDefaultValues(object);\n      }\n\n      return object;\n    },\n\n    /**\n     * Returns (dataless) object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} Object representation of an instance\n     */\n    toDatalessObject: function(propertiesToInclude) {\n      // will be overwritten by subclasses\n      return this.toObject(propertiesToInclude);\n    },\n\n    /**\n     * @private\n     * @param {Object} object\n     */\n    _removeDefaultValues: function(object) {\n      var prototype = fabric.util.getKlass(object.type).prototype,\n          stateProperties = prototype.stateProperties;\n      stateProperties.forEach(function(prop) {\n        if (prop === 'left' || prop === 'top') {\n          return;\n        }\n        if (object[prop] === prototype[prop]) {\n          delete object[prop];\n        }\n        var isArray = Object.prototype.toString.call(object[prop]) === '[object Array]' &&\n                      Object.prototype.toString.call(prototype[prop]) === '[object Array]';\n\n        // basically a check for [] === []\n        if (isArray && object[prop].length === 0 && prototype[prop].length === 0) {\n          delete object[prop];\n        }\n      });\n\n      return object;\n    },\n\n    /**\n     * Returns a string representation of an instance\n     * @return {String}\n     */\n    toString: function() {\n      return '#<fabric.' + capitalize(this.type) + '>';\n    },\n\n    /**\n     * Return the object scale factor counting also the group scaling\n     * @return {Object} object with scaleX and scaleY properties\n     */\n    getObjectScaling: function() {\n      var scaleX = this.scaleX, scaleY = this.scaleY;\n      if (this.group) {\n        var scaling = this.group.getObjectScaling();\n        scaleX *= scaling.scaleX;\n        scaleY *= scaling.scaleY;\n      }\n      return { scaleX: scaleX, scaleY: scaleY };\n    },\n\n    /**\n     * Return the object scale factor counting also the group scaling, zoom and retina\n     * @return {Object} object with scaleX and scaleY properties\n     */\n    getTotalObjectScaling: function() {\n      var scale = this.getObjectScaling(), scaleX = scale.scaleX, scaleY = scale.scaleY;\n      if (this.canvas) {\n        var zoom = this.canvas.getZoom();\n        var retina = this.canvas.getRetinaScaling();\n        scaleX *= zoom * retina;\n        scaleY *= zoom * retina;\n      }\n      return { scaleX: scaleX, scaleY: scaleY };\n    },\n\n    /**\n     * Return the object opacity counting also the group property\n     * @return {Number}\n     */\n    getObjectOpacity: function() {\n      var opacity = this.opacity;\n      if (this.group) {\n        opacity *= this.group.getObjectOpacity();\n      }\n      return opacity;\n    },\n\n    /**\n     * @private\n     * @param {String} key\n     * @param {*} value\n     * @return {fabric.Object} thisArg\n     */\n    _set: function(key, value) {\n      var shouldConstrainValue = (key === 'scaleX' || key === 'scaleY'),\n          isChanged = this[key] !== value, groupNeedsUpdate = false;\n\n      if (shouldConstrainValue) {\n        value = this._constrainScale(value);\n      }\n      if (key === 'scaleX' && value < 0) {\n        this.flipX = !this.flipX;\n        value *= -1;\n      }\n      else if (key === 'scaleY' && value < 0) {\n        this.flipY = !this.flipY;\n        value *= -1;\n      }\n      else if (key === 'shadow' && value && !(value instanceof fabric.Shadow)) {\n        value = new fabric.Shadow(value);\n      }\n      else if (key === 'dirty' && this.group) {\n        this.group.set('dirty', value);\n      }\n\n      this[key] = value;\n\n      if (isChanged) {\n        groupNeedsUpdate = this.group && this.group.isOnACache();\n        if (this.cacheProperties.indexOf(key) > -1) {\n          this.dirty = true;\n          groupNeedsUpdate && this.group.set('dirty', true);\n        }\n        else if (groupNeedsUpdate && this.stateProperties.indexOf(key) > -1) {\n          this.group.set('dirty', true);\n        }\n      }\n\n      return this;\n    },\n\n    /**\n     * This callback function is called by the parent group of an object every\n     * time a non-delegated property changes on the group. It is passed the key\n     * and value as parameters. Not adding in this function's signature to avoid\n     * Travis build error about unused variables.\n     */\n    setOnGroup: function() {\n      // implemented by sub-classes, as needed.\n    },\n\n    /**\n     * Retrieves viewportTransform from Object's canvas if possible\n     * @method getViewportTransform\n     * @memberOf fabric.Object.prototype\n     * @return {Array}\n     */\n    getViewportTransform: function() {\n      if (this.canvas && this.canvas.viewportTransform) {\n        return this.canvas.viewportTransform;\n      }\n      return fabric.iMatrix.concat();\n    },\n\n    /*\n     * @private\n     * return if the object would be visible in rendering\n     * @memberOf fabric.Object.prototype\n     * @return {Boolean}\n     */\n    isNotVisible: function() {\n      return this.opacity === 0 ||\n        (this.width === 0 && this.height === 0 && this.strokeWidth === 0) ||\n        !this.visible;\n    },\n\n    /**\n     * Renders an object on a specified context\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    render: function(ctx) {\n      // do not render if width/height are zeros or object is not visible\n      if (this.isNotVisible()) {\n        return;\n      }\n      if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {\n        return;\n      }\n      ctx.save();\n      this._setupCompositeOperation(ctx);\n      this.drawSelectionBackground(ctx);\n      this.transform(ctx);\n      this._setOpacity(ctx);\n      this._setShadow(ctx, this);\n      if (this.transformMatrix) {\n        ctx.transform.apply(ctx, this.transformMatrix);\n      }\n      this.clipTo && fabric.util.clipContext(this, ctx);\n      if (this.shouldCache()) {\n        this.renderCache();\n        this.drawCacheOnCanvas(ctx);\n      }\n      else {\n        this._removeCacheCanvas();\n        this.dirty = false;\n        this.drawObject(ctx);\n        if (this.objectCaching && this.statefullCache) {\n          this.saveState({ propertySet: 'cacheProperties' });\n        }\n      }\n      this.clipTo && ctx.restore();\n      ctx.restore();\n    },\n\n    renderCache: function(options) {\n      options = options || {};\n      if (!this._cacheCanvas) {\n        this._createCacheCanvas();\n      }\n      if (this.isCacheDirty()) {\n        this.statefullCache && this.saveState({ propertySet: 'cacheProperties' });\n        this.drawObject(this._cacheContext, options.forClipping);\n        this.dirty = false;\n      }\n    },\n\n    /**\n     * Remove cacheCanvas and its dimensions from the objects\n     */\n    _removeCacheCanvas: function() {\n      this._cacheCanvas = null;\n      this.cacheWidth = 0;\n      this.cacheHeight = 0;\n    },\n\n    /**\n     * return true if the object will draw a stroke\n     * Does not consider text styles. This is just a shortcut used at rendering time\n     * We want it to be an aproximation and be fast.\n     * wrote to avoid extra caching, it has to return true when stroke happens,\n     * can guess when it will not happen at 100% chance, does not matter if it misses\n     * some use case where the stroke is invisible.\n     * @since 3.0.0\n     * @returns Boolean\n     */\n    hasStroke: function() {\n      return this.stroke && this.stroke !== 'transparent' && this.strokeWidth !== 0;\n    },\n\n    /**\n     * return true if the object will draw a fill\n     * Does not consider text styles. This is just a shortcut used at rendering time\n     * We want it to be an aproximation and be fast.\n     * wrote to avoid extra caching, it has to return true when fill happens,\n     * can guess when it will not happen at 100% chance, does not matter if it misses\n     * some use case where the fill is invisible.\n     * @since 3.0.0\n     * @returns Boolean\n     */\n    hasFill: function() {\n      return this.fill && this.fill !== 'transparent';\n    },\n\n    /**\n     * When set to `true`, force the object to have its own cache, even if it is inside a group\n     * it may be needed when your object behave in a particular way on the cache and always needs\n     * its own isolated canvas to render correctly.\n     * Created to be overridden\n     * since 1.7.12\n     * @returns Boolean\n     */\n    needsItsOwnCache: function() {\n      if (this.paintFirst === 'stroke' &&\n        this.hasFill() && this.hasStroke() && typeof this.shadow === 'object') {\n        return true;\n      }\n      if (this.clipPath) {\n        return true;\n      }\n      return false;\n    },\n\n    /**\n     * Decide if the object should cache or not. Create its own cache level\n     * objectCaching is a global flag, wins over everything\n     * needsItsOwnCache should be used when the object drawing method requires\n     * a cache step. None of the fabric classes requires it.\n     * Generally you do not cache objects in groups because the group outside is cached.\n     * Read as: cache if is needed, or if the feature is enabled but we are not already caching.\n     * @return {Boolean}\n     */\n    shouldCache: function() {\n      this.ownCaching = this.needsItsOwnCache() || (\n        this.objectCaching &&\n        (!this.group || !this.group.isOnACache())\n      );\n      return this.ownCaching;\n    },\n\n    /**\n     * Check if this object or a child object will cast a shadow\n     * used by Group.shouldCache to know if child has a shadow recursively\n     * @return {Boolean}\n     */\n    willDrawShadow: function() {\n      return !!this.shadow && (this.shadow.offsetX !== 0 || this.shadow.offsetY !== 0);\n    },\n\n    /**\n     * Execute the drawing operation for an object clipPath\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    drawClipPathOnCache: function(ctx) {\n      var path = this.clipPath;\n      ctx.save();\n      // DEBUG: uncomment this line, comment the following\n      // ctx.globalAlpha = 0.4\n      if (path.inverted) {\n        ctx.globalCompositeOperation = 'destination-out';\n      }\n      else {\n        ctx.globalCompositeOperation = 'destination-in';\n      }\n      //ctx.scale(1 / 2, 1 / 2);\n      if (path.absolutePositioned) {\n        var m = fabric.util.invertTransform(this.calcTransformMatrix());\n        ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n      }\n      path.transform(ctx);\n      ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n      ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n      ctx.restore();\n    },\n\n    /**\n     * Execute the drawing operation for an object on a specified context\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    drawObject: function(ctx, forClipping) {\n      var originalFill = this.fill, originalStroke = this.stroke;\n      if (forClipping) {\n        this.fill = 'black';\n        this.stroke = '';\n        this._setClippingProperties(ctx);\n      }\n      else {\n        this._renderBackground(ctx);\n        this._setStrokeStyles(ctx, this);\n        this._setFillStyles(ctx, this);\n      }\n      this._render(ctx);\n      this._drawClipPath(ctx);\n      this.fill = originalFill;\n      this.stroke = originalStroke;\n    },\n\n    _drawClipPath: function(ctx) {\n      var path = this.clipPath;\n      if (!path) { return; }\n      // needed to setup a couple of variables\n      // path canvas gets overridden with this one.\n      // TODO find a better solution?\n      path.canvas = this.canvas;\n      path.shouldCache();\n      path._transformDone = true;\n      path.renderCache({ forClipping: true });\n      this.drawClipPathOnCache(ctx);\n    },\n\n    /**\n     * Paint the cached copy of the object on the target context.\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    drawCacheOnCanvas: function(ctx) {\n      ctx.scale(1 / this.zoomX, 1 / this.zoomY);\n      ctx.drawImage(this._cacheCanvas, -this.cacheTranslationX, -this.cacheTranslationY);\n    },\n\n    /**\n     * Check if cache is dirty\n     * @param {Boolean} skipCanvas skip canvas checks because this object is painted\n     * on parent canvas.\n     */\n    isCacheDirty: function(skipCanvas) {\n      if (this.isNotVisible()) {\n        return false;\n      }\n      if (this._cacheCanvas && !skipCanvas && this._updateCacheCanvas()) {\n        // in this case the context is already cleared.\n        return true;\n      }\n      else {\n        if (this.dirty ||\n          (this.clipPath && this.clipPath.absolutePositioned) ||\n          (this.statefullCache && this.hasStateChanged('cacheProperties'))\n        ) {\n          if (this._cacheCanvas && !skipCanvas) {\n            var width = this.cacheWidth / this.zoomX;\n            var height = this.cacheHeight / this.zoomY;\n            this._cacheContext.clearRect(-width / 2, -height / 2, width, height);\n          }\n          return true;\n        }\n      }\n      return false;\n    },\n\n    /**\n     * Draws a background for the object big as its untransformed dimensions\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderBackground: function(ctx) {\n      if (!this.backgroundColor) {\n        return;\n      }\n      var dim = this._getNonTransformedDimensions();\n      ctx.fillStyle = this.backgroundColor;\n\n      ctx.fillRect(\n        -dim.x / 2,\n        -dim.y / 2,\n        dim.x,\n        dim.y\n      );\n      // if there is background color no other shadows\n      // should be casted\n      this._removeShadow(ctx);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _setOpacity: function(ctx) {\n      if (this.group && !this.group._transformDone) {\n        ctx.globalAlpha = this.getObjectOpacity();\n      }\n      else {\n        ctx.globalAlpha *= this.opacity;\n      }\n    },\n\n    _setStrokeStyles: function(ctx, decl) {\n      if (decl.stroke) {\n        ctx.lineWidth = decl.strokeWidth;\n        ctx.lineCap = decl.strokeLineCap;\n        ctx.lineDashOffset = decl.strokeDashOffset;\n        ctx.lineJoin = decl.strokeLineJoin;\n        ctx.miterLimit = decl.strokeMiterLimit;\n        ctx.strokeStyle = decl.stroke.toLive\n          ? decl.stroke.toLive(ctx, this)\n          : decl.stroke;\n      }\n    },\n\n    _setFillStyles: function(ctx, decl) {\n      if (decl.fill) {\n        ctx.fillStyle = decl.fill.toLive\n          ? decl.fill.toLive(ctx, this)\n          : decl.fill;\n      }\n    },\n\n    _setClippingProperties: function(ctx) {\n      ctx.globalAlpha = 1;\n      ctx.strokeStyle = 'transparent';\n      ctx.fillStyle = '#000000';\n    },\n\n    /**\n     * @private\n     * Sets line dash\n     * @param {CanvasRenderingContext2D} ctx Context to set the dash line on\n     * @param {Array} dashArray array representing dashes\n     * @param {Function} alternative function to call if browser does not support lineDash\n     */\n    _setLineDash: function(ctx, dashArray, alternative) {\n      if (!dashArray) {\n        return;\n      }\n      // Spec requires the concatenation of two copies the dash list when the number of elements is odd\n      if (1 & dashArray.length) {\n        dashArray.push.apply(dashArray, dashArray);\n      }\n      if (supportsLineDash) {\n        ctx.setLineDash(dashArray);\n      }\n      else {\n        alternative && alternative(ctx);\n      }\n      if (this.strokeUniform) {\n        ctx.setLineDash(ctx.getLineDash().map(function(value) { return value * ctx.lineWidth; }));\n      }\n    },\n\n    /**\n     * Renders controls and borders for the object\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     * @param {Object} [styleOverride] properties to override the object style\n     */\n    _renderControls: function(ctx, styleOverride) {\n      var vpt = this.getViewportTransform(),\n          matrix = this.calcTransformMatrix(),\n          options, drawBorders, drawControls;\n      styleOverride = styleOverride || { };\n      drawBorders = typeof styleOverride.hasBorders !== 'undefined' ? styleOverride.hasBorders : this.hasBorders;\n      drawControls = typeof styleOverride.hasControls !== 'undefined' ? styleOverride.hasControls : this.hasControls;\n      matrix = fabric.util.multiplyTransformMatrices(vpt, matrix);\n      options = fabric.util.qrDecompose(matrix);\n      ctx.save();\n      ctx.translate(options.translateX, options.translateY);\n      ctx.lineWidth = 1 * this.borderScaleFactor;\n      if (!this.group) {\n        ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;\n      }\n      if (styleOverride.forActiveSelection) {\n        ctx.rotate(degreesToRadians(options.angle));\n        drawBorders && this.drawBordersInGroup(ctx, options, styleOverride);\n      }\n      else {\n        ctx.rotate(degreesToRadians(this.angle));\n        drawBorders && this.drawBorders(ctx, styleOverride);\n      }\n      drawControls && this.drawControls(ctx, styleOverride);\n      ctx.restore();\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _setShadow: function(ctx) {\n      if (!this.shadow) {\n        return;\n      }\n\n      var shadow = this.shadow, canvas = this.canvas, scaling,\n          multX = (canvas && canvas.viewportTransform[0]) || 1,\n          multY = (canvas && canvas.viewportTransform[3]) || 1;\n      if (shadow.nonScaling) {\n        scaling = { scaleX: 1, scaleY: 1 };\n      }\n      else {\n        scaling = this.getObjectScaling();\n      }\n      if (canvas && canvas._isRetinaScaling()) {\n        multX *= fabric.devicePixelRatio;\n        multY *= fabric.devicePixelRatio;\n      }\n      ctx.shadowColor = shadow.color;\n      ctx.shadowBlur = shadow.blur * fabric.browserShadowBlurConstant *\n        (multX + multY) * (scaling.scaleX + scaling.scaleY) / 4;\n      ctx.shadowOffsetX = shadow.offsetX * multX * scaling.scaleX;\n      ctx.shadowOffsetY = shadow.offsetY * multY * scaling.scaleY;\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _removeShadow: function(ctx) {\n      if (!this.shadow) {\n        return;\n      }\n\n      ctx.shadowColor = '';\n      ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     * @param {Object} filler fabric.Pattern or fabric.Gradient\n     * @return {Object} offset.offsetX offset for text rendering\n     * @return {Object} offset.offsetY offset for text rendering\n     */\n    _applyPatternGradientTransform: function(ctx, filler) {\n      if (!filler || !filler.toLive) {\n        return { offsetX: 0, offsetY: 0 };\n      }\n      var t = filler.gradientTransform || filler.patternTransform;\n      var offsetX = -this.width / 2 + filler.offsetX || 0,\n          offsetY = -this.height / 2 + filler.offsetY || 0;\n      ctx.translate(offsetX, offsetY);\n      if (t) {\n        ctx.transform(t[0], t[1], t[2], t[3], t[4], t[5]);\n      }\n      return { offsetX: offsetX, offsetY: offsetY };\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderPaintInOrder: function(ctx) {\n      if (this.paintFirst === 'stroke') {\n        this._renderStroke(ctx);\n        this._renderFill(ctx);\n      }\n      else {\n        this._renderFill(ctx);\n        this._renderStroke(ctx);\n      }\n    },\n\n    /**\n     * @private\n     * function that actually render something on the context.\n     * empty here to allow Obects to work on tests to benchmark fabric functionalites\n     * not related to rendering\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(/* ctx */) {\n\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderFill: function(ctx) {\n      if (!this.fill) {\n        return;\n      }\n\n      ctx.save();\n      this._applyPatternGradientTransform(ctx, this.fill);\n      if (this.fillRule === 'evenodd') {\n        ctx.fill('evenodd');\n      }\n      else {\n        ctx.fill();\n      }\n      ctx.restore();\n    },\n\n    _renderStroke: function(ctx) {\n      if (!this.stroke || this.strokeWidth === 0) {\n        return;\n      }\n\n      if (this.shadow && !this.shadow.affectStroke) {\n        this._removeShadow(ctx);\n      }\n\n      ctx.save();\n      if (this.strokeUniform) {\n        ctx.scale(1 / this.scaleX, 1 / this.scaleY);\n      }\n      this._setLineDash(ctx, this.strokeDashArray, this._renderDashedStroke);\n      this._applyPatternGradientTransform(ctx, this.stroke);\n      ctx.stroke();\n      ctx.restore();\n    },\n\n    /**\n     * This function is an helper for svg import. it returns the center of the object in the svg\n     * untransformed coordinates\n     * @private\n     * @return {Object} center point from element coordinates\n     */\n    _findCenterFromElement: function() {\n      return { x: this.left + this.width / 2, y: this.top + this.height / 2 };\n    },\n\n    /**\n     * This function is an helper for svg import. it decompose the transformMatrix\n     * and assign properties to object.\n     * untransformed coordinates\n     * @private\n     * @chainable\n     */\n    _assignTransformMatrixProps: function() {\n      if (this.transformMatrix) {\n        var options = fabric.util.qrDecompose(this.transformMatrix);\n        this.flipX = false;\n        this.flipY = false;\n        this.set('scaleX', options.scaleX);\n        this.set('scaleY', options.scaleY);\n        this.angle = options.angle;\n        this.skewX = options.skewX;\n        this.skewY = 0;\n      }\n    },\n\n    /**\n     * This function is an helper for svg import. it removes the transform matrix\n     * and set to object properties that fabricjs can handle\n     * @private\n     * @param {Object} preserveAspectRatioOptions\n     * @return {thisArg}\n     */\n    _removeTransformMatrix: function(preserveAspectRatioOptions) {\n      var center = this._findCenterFromElement();\n      if (this.transformMatrix) {\n        this._assignTransformMatrixProps();\n        center = fabric.util.transformPoint(center, this.transformMatrix);\n      }\n      this.transformMatrix = null;\n      if (preserveAspectRatioOptions) {\n        this.scaleX *= preserveAspectRatioOptions.scaleX;\n        this.scaleY *= preserveAspectRatioOptions.scaleY;\n        this.cropX = preserveAspectRatioOptions.cropX;\n        this.cropY = preserveAspectRatioOptions.cropY;\n        center.x += preserveAspectRatioOptions.offsetLeft;\n        center.y += preserveAspectRatioOptions.offsetTop;\n        this.width = preserveAspectRatioOptions.width;\n        this.height = preserveAspectRatioOptions.height;\n      }\n      this.setPositionByOrigin(center, 'center', 'center');\n    },\n\n    /**\n     * Clones an instance, using a callback method will work for every object.\n     * @param {Function} callback Callback is invoked with a clone as a first argument\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     */\n    clone: function(callback, propertiesToInclude) {\n      var objectForm = this.toObject(propertiesToInclude);\n      if (this.constructor.fromObject) {\n        this.constructor.fromObject(objectForm, callback);\n      }\n      else {\n        fabric.Object._fromObject('Object', objectForm, callback);\n      }\n    },\n\n    /**\n     * Creates an instance of fabric.Image out of an object\n     * could make use of both toDataUrl or toCanvasElement.\n     * @param {Function} callback callback, invoked with an instance as a first argument\n     * @param {Object} [options] for clone as image, passed to toDataURL\n     * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n     * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n     * @param {Number} [options.multiplier=1] Multiplier to scale by\n     * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n     * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n     * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n     * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n     * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n     * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n     * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n     * @return {fabric.Object} thisArg\n     */\n    cloneAsImage: function(callback, options) {\n      var canvasEl = this.toCanvasElement(options);\n      if (callback) {\n        callback(new fabric.Image(canvasEl));\n      }\n      return this;\n    },\n\n    /**\n     * Converts an object into a HTMLCanvas element\n     * @param {Object} options Options object\n     * @param {Number} [options.multiplier=1] Multiplier to scale by\n     * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n     * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n     * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n     * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n     * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n     * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n     * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n     * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n     */\n    toCanvasElement: function(options) {\n      options || (options = { });\n\n      var utils = fabric.util, origParams = utils.saveObjectTransform(this),\n          originalShadow = this.shadow, abs = Math.abs,\n          multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? fabric.devicePixelRatio : 1);\n\n      if (options.withoutTransform) {\n        utils.resetObjectTransform(this);\n      }\n      if (options.withoutShadow) {\n        this.shadow = null;\n      }\n\n      var el = fabric.util.createCanvasElement(),\n          // skip canvas zoom and calculate with setCoords now.\n          boundingRect = this.getBoundingRect(true, true),\n          shadow = this.shadow, scaling,\n          shadowOffset = { x: 0, y: 0 }, shadowBlur;\n\n      if (shadow) {\n        shadowBlur = shadow.blur;\n        if (shadow.nonScaling) {\n          scaling = { scaleX: 1, scaleY: 1 };\n        }\n        else {\n          scaling = this.getObjectScaling();\n        }\n        shadowOffset.x = 2 * Math.round(abs(shadow.offsetX) + shadowBlur) * (abs(scaling.scaleX));\n        shadowOffset.y = 2 * Math.round(abs(shadow.offsetY) + shadowBlur) * (abs(scaling.scaleY));\n      }\n      el.width = boundingRect.width + shadowOffset.x;\n      el.height = boundingRect.height + shadowOffset.y;\n      el.width += el.width % 2 ? 2 - el.width % 2 : 0;\n      el.height += el.height % 2 ? 2 - el.height % 2 : 0;\n      var canvas = new fabric.StaticCanvas(el, {\n        enableRetinaScaling: false,\n        renderOnAddRemove: false,\n        skipOffscreen: false,\n      });\n      if (options.format === 'jpeg') {\n        canvas.backgroundColor = '#fff';\n      }\n      this.setPositionByOrigin(new fabric.Point(canvas.width / 2, canvas.height / 2), 'center', 'center');\n\n      var originalCanvas = this.canvas;\n      canvas.add(this);\n      var canvasEl = canvas.toCanvasElement(multiplier || 1, options);\n      this.shadow = originalShadow;\n      this.canvas = originalCanvas;\n      this.set(origParams).setCoords();\n      // canvas.dispose will call image.dispose that will nullify the elements\n      // since this canvas is a simple element for the process, we remove references\n      // to objects in this way in order to avoid object trashing.\n      canvas._objects = [];\n      canvas.dispose();\n      canvas = null;\n\n      return canvasEl;\n    },\n\n    /**\n     * Converts an object into a data-url-like string\n     * @param {Object} options Options object\n     * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n     * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n     * @param {Number} [options.multiplier=1] Multiplier to scale by\n     * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n     * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n     * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n     * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n     * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n     * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n     * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n     * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n     */\n    toDataURL: function(options) {\n      options || (options = { });\n      return fabric.util.toDataURL(this.toCanvasElement(options), options.format || 'png', options.quality || 1);\n    },\n\n    /**\n     * Returns true if specified type is identical to the type of an instance\n     * @param {String} type Type to check against\n     * @return {Boolean}\n     */\n    isType: function(type) {\n      return this.type === type;\n    },\n\n    /**\n     * Returns complexity of an instance\n     * @return {Number} complexity of this instance (is 1 unless subclassed)\n     */\n    complexity: function() {\n      return 1;\n    },\n\n    /**\n     * Returns a JSON representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} JSON\n     */\n    toJSON: function(propertiesToInclude) {\n      // delegate, not alias\n      return this.toObject(propertiesToInclude);\n    },\n\n    /**\n     * Sets gradient (fill or stroke) of an object\n     * <b>Backwards incompatibility note:</b> This method was named \"setGradientFill\" until v1.1.0\n     * @param {String} property Property name 'stroke' or 'fill'\n     * @param {Object} [options] Options object\n     * @param {String} [options.type] Type of gradient 'radial' or 'linear'\n     * @param {Number} [options.x1=0] x-coordinate of start point\n     * @param {Number} [options.y1=0] y-coordinate of start point\n     * @param {Number} [options.x2=0] x-coordinate of end point\n     * @param {Number} [options.y2=0] y-coordinate of end point\n     * @param {Number} [options.r1=0] Radius of start point (only for radial gradients)\n     * @param {Number} [options.r2=0] Radius of end point (only for radial gradients)\n     * @param {Object} [options.colorStops] Color stops object eg. {0: 'ff0000', 1: '000000'}\n     * @param {Object} [options.gradientTransform] transformMatrix for gradient\n     * @return {fabric.Object} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/58y8b/|jsFiddle demo}\n     * @example <caption>Set linear gradient</caption>\n     * object.setGradient('fill', {\n     *   type: 'linear',\n     *   x1: -object.width / 2,\n     *   y1: 0,\n     *   x2: object.width / 2,\n     *   y2: 0,\n     *   colorStops: {\n     *     0: 'red',\n     *     0.5: '#005555',\n     *     1: 'rgba(0,0,255,0.5)'\n     *   }\n     * });\n     * canvas.renderAll();\n     * @example <caption>Set radial gradient</caption>\n     * object.setGradient('fill', {\n     *   type: 'radial',\n     *   x1: 0,\n     *   y1: 0,\n     *   x2: 0,\n     *   y2: 0,\n     *   r1: object.width / 2,\n     *   r2: 10,\n     *   colorStops: {\n     *     0: 'red',\n     *     0.5: '#005555',\n     *     1: 'rgba(0,0,255,0.5)'\n     *   }\n     * });\n     * canvas.renderAll();\n     */\n    setGradient: function(property, options) {\n      options || (options = { });\n\n      var gradient = { colorStops: [] };\n\n      gradient.type = options.type || (options.r1 || options.r2 ? 'radial' : 'linear');\n      gradient.coords = {\n        x1: options.x1,\n        y1: options.y1,\n        x2: options.x2,\n        y2: options.y2\n      };\n\n      if (options.r1 || options.r2) {\n        gradient.coords.r1 = options.r1;\n        gradient.coords.r2 = options.r2;\n      }\n\n      gradient.gradientTransform = options.gradientTransform;\n      fabric.Gradient.prototype.addColorStop.call(gradient, options.colorStops);\n\n      return this.set(property, fabric.Gradient.forObject(this, gradient));\n    },\n\n    /**\n     * Sets pattern fill of an object\n     * @param {Object} options Options object\n     * @param {(String|HTMLImageElement)} options.source Pattern source\n     * @param {String} [options.repeat=repeat] Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)\n     * @param {Number} [options.offsetX=0] Pattern horizontal offset from object's left/top corner\n     * @param {Number} [options.offsetY=0] Pattern vertical offset from object's left/top corner\n     * @param {Function} [callback] Callback to invoke when image set as a pattern\n     * @return {fabric.Object} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/QT3pa/|jsFiddle demo}\n     * @example <caption>Set pattern</caption>\n     * object.setPatternFill({\n     *   source: 'http://fabricjs.com/assets/escheresque_ste.png',\n     *   repeat: 'repeat'\n     * },canvas.renderAll.bind(canvas));\n     */\n    setPatternFill: function(options, callback) {\n      return this.set('fill', new fabric.Pattern(options, callback));\n    },\n\n    /**\n     * Sets {@link fabric.Object#shadow|shadow} of an object\n     * @param {Object|String} [options] Options object or string (e.g. \"2px 2px 10px rgba(0,0,0,0.2)\")\n     * @param {String} [options.color=rgb(0,0,0)] Shadow color\n     * @param {Number} [options.blur=0] Shadow blur\n     * @param {Number} [options.offsetX=0] Shadow horizontal offset\n     * @param {Number} [options.offsetY=0] Shadow vertical offset\n     * @return {fabric.Object} thisArg\n     * @chainable\n     * @see {@link http://jsfiddle.net/fabricjs/7gvJG/|jsFiddle demo}\n     * @example <caption>Set shadow with string notation</caption>\n     * object.setShadow('2px 2px 10px rgba(0,0,0,0.2)');\n     * canvas.renderAll();\n     * @example <caption>Set shadow with object notation</caption>\n     * object.setShadow({\n     *   color: 'red',\n     *   blur: 10,\n     *   offsetX: 20,\n     *   offsetY: 20\n     * });\n     * canvas.renderAll();\n     */\n    setShadow: function(options) {\n      return this.set('shadow', options ? new fabric.Shadow(options) : null);\n    },\n\n    /**\n     * Sets \"color\" of an instance (alias of `set('fill', &hellip;)`)\n     * @param {String} color Color value\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    setColor: function(color) {\n      this.set('fill', color);\n      return this;\n    },\n\n    /**\n     * Sets \"angle\" of an instance with centered rotation\n     * @param {Number} angle Angle value (in degrees)\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    rotate: function(angle) {\n      var shouldCenterOrigin = (this.originX !== 'center' || this.originY !== 'center') && this.centeredRotation;\n\n      if (shouldCenterOrigin) {\n        this._setOriginToCenter();\n      }\n\n      this.set('angle', angle);\n\n      if (shouldCenterOrigin) {\n        this._resetOrigin();\n      }\n\n      return this;\n    },\n\n    /**\n     * Centers object horizontally on canvas to which it was added last.\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    centerH: function () {\n      this.canvas && this.canvas.centerObjectH(this);\n      return this;\n    },\n\n    /**\n     * Centers object horizontally on current viewport of canvas to which it was added last.\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    viewportCenterH: function () {\n      this.canvas && this.canvas.viewportCenterObjectH(this);\n      return this;\n    },\n\n    /**\n     * Centers object vertically on canvas to which it was added last.\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    centerV: function () {\n      this.canvas && this.canvas.centerObjectV(this);\n      return this;\n    },\n\n    /**\n     * Centers object vertically on current viewport of canvas to which it was added last.\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    viewportCenterV: function () {\n      this.canvas && this.canvas.viewportCenterObjectV(this);\n      return this;\n    },\n\n    /**\n     * Centers object vertically and horizontally on canvas to which is was added last\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    center: function () {\n      this.canvas && this.canvas.centerObject(this);\n      return this;\n    },\n\n    /**\n     * Centers object on current viewport of canvas to which it was added last.\n     * You might need to call `setCoords` on an object after centering, to update controls area.\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    viewportCenter: function () {\n      this.canvas && this.canvas.viewportCenterObject(this);\n      return this;\n    },\n\n    /**\n     * Returns coordinates of a pointer relative to an object\n     * @param {Event} e Event to operate upon\n     * @param {Object} [pointer] Pointer to operate upon (instead of event)\n     * @return {Object} Coordinates of a pointer (x, y)\n     */\n    getLocalPointer: function(e, pointer) {\n      pointer = pointer || this.canvas.getPointer(e);\n      var pClicked = new fabric.Point(pointer.x, pointer.y),\n          objectLeftTop = this._getLeftTopCoords();\n      if (this.angle) {\n        pClicked = fabric.util.rotatePoint(\n          pClicked, objectLeftTop, degreesToRadians(-this.angle));\n      }\n      return {\n        x: pClicked.x - objectLeftTop.x,\n        y: pClicked.y - objectLeftTop.y\n      };\n    },\n\n    /**\n     * Sets canvas globalCompositeOperation for specific object\n     * custom composition operation for the particular object can be specified using globalCompositeOperation property\n     * @param {CanvasRenderingContext2D} ctx Rendering canvas context\n     */\n    _setupCompositeOperation: function (ctx) {\n      if (this.globalCompositeOperation) {\n        ctx.globalCompositeOperation = this.globalCompositeOperation;\n      }\n    }\n  });\n\n  fabric.util.createAccessors && fabric.util.createAccessors(fabric.Object);\n\n  extend(fabric.Object.prototype, fabric.Observable);\n\n  /**\n   * Defines the number of fraction digits to use when serializing object values.\n   * You can use it to increase/decrease precision of such values like left, top, scaleX, scaleY, etc.\n   * @static\n   * @memberOf fabric.Object\n   * @constant\n   * @type Number\n   */\n  fabric.Object.NUM_FRACTION_DIGITS = 2;\n\n  fabric.Object._fromObject = function(className, object, callback, extraParam) {\n    var klass = fabric[className];\n    object = clone(object, true);\n    fabric.util.enlivenPatterns([object.fill, object.stroke], function(patterns) {\n      if (typeof patterns[0] !== 'undefined') {\n        object.fill = patterns[0];\n      }\n      if (typeof patterns[1] !== 'undefined') {\n        object.stroke = patterns[1];\n      }\n      fabric.util.enlivenObjects([object.clipPath], function(enlivedProps) {\n        object.clipPath = enlivedProps[0];\n        var instance = extraParam ? new klass(object[extraParam], object) : new klass(object);\n        callback && callback(instance);\n      });\n    });\n  };\n\n  /**\n   * Unique id used internally when creating SVG elements\n   * @static\n   * @memberOf fabric.Object\n   * @type Number\n   */\n  fabric.Object.__uid = 0;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n  var degreesToRadians = fabric.util.degreesToRadians,\n      originXOffset = {\n        left: -0.5,\n        center: 0,\n        right: 0.5\n      },\n      originYOffset = {\n        top: -0.5,\n        center: 0,\n        bottom: 0.5\n      };\n\n  fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n    /**\n     * Translates the coordinates from a set of origin to another (based on the object's dimensions)\n     * @param {fabric.Point} point The point which corresponds to the originX and originY params\n     * @param {String} fromOriginX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} fromOriginY Vertical origin: 'top', 'center' or 'bottom'\n     * @param {String} toOriginX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} toOriginY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {fabric.Point}\n     */\n    translateToGivenOrigin: function(point, fromOriginX, fromOriginY, toOriginX, toOriginY) {\n      var x = point.x,\n          y = point.y,\n          offsetX, offsetY, dim;\n\n      if (typeof fromOriginX === 'string') {\n        fromOriginX = originXOffset[fromOriginX];\n      }\n      else {\n        fromOriginX -= 0.5;\n      }\n\n      if (typeof toOriginX === 'string') {\n        toOriginX = originXOffset[toOriginX];\n      }\n      else {\n        toOriginX -= 0.5;\n      }\n\n      offsetX = toOriginX - fromOriginX;\n\n      if (typeof fromOriginY === 'string') {\n        fromOriginY = originYOffset[fromOriginY];\n      }\n      else {\n        fromOriginY -= 0.5;\n      }\n\n      if (typeof toOriginY === 'string') {\n        toOriginY = originYOffset[toOriginY];\n      }\n      else {\n        toOriginY -= 0.5;\n      }\n\n      offsetY = toOriginY - fromOriginY;\n\n      if (offsetX || offsetY) {\n        dim = this._getTransformedDimensions();\n        x = point.x + offsetX * dim.x;\n        y = point.y + offsetY * dim.y;\n      }\n\n      return new fabric.Point(x, y);\n    },\n\n    /**\n     * Translates the coordinates from origin to center coordinates (based on the object's dimensions)\n     * @param {fabric.Point} point The point which corresponds to the originX and originY params\n     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {fabric.Point}\n     */\n    translateToCenterPoint: function(point, originX, originY) {\n      var p = this.translateToGivenOrigin(point, originX, originY, 'center', 'center');\n      if (this.angle) {\n        return fabric.util.rotatePoint(p, point, degreesToRadians(this.angle));\n      }\n      return p;\n    },\n\n    /**\n     * Translates the coordinates from center to origin coordinates (based on the object's dimensions)\n     * @param {fabric.Point} center The point which corresponds to center of the object\n     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {fabric.Point}\n     */\n    translateToOriginPoint: function(center, originX, originY) {\n      var p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n      if (this.angle) {\n        return fabric.util.rotatePoint(p, center, degreesToRadians(this.angle));\n      }\n      return p;\n    },\n\n    /**\n     * Returns the real center coordinates of the object\n     * @return {fabric.Point}\n     */\n    getCenterPoint: function() {\n      var leftTop = new fabric.Point(this.left, this.top);\n      return this.translateToCenterPoint(leftTop, this.originX, this.originY);\n    },\n\n    /**\n     * Returns the coordinates of the object based on center coordinates\n     * @param {fabric.Point} point The point which corresponds to the originX and originY params\n     * @return {fabric.Point}\n     */\n    // getOriginPoint: function(center) {\n    //   return this.translateToOriginPoint(center, this.originX, this.originY);\n    // },\n\n    /**\n     * Returns the coordinates of the object as if it has a different origin\n     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {fabric.Point}\n     */\n    getPointByOrigin: function(originX, originY) {\n      var center = this.getCenterPoint();\n      return this.translateToOriginPoint(center, originX, originY);\n    },\n\n    /**\n     * Returns the point in local coordinates\n     * @param {fabric.Point} point The point relative to the global coordinate system\n     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {fabric.Point}\n     */\n    toLocalPoint: function(point, originX, originY) {\n      var center = this.getCenterPoint(),\n          p, p2;\n\n      if (typeof originX !== 'undefined' && typeof originY !== 'undefined' ) {\n        p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n      }\n      else {\n        p = new fabric.Point(this.left, this.top);\n      }\n\n      p2 = new fabric.Point(point.x, point.y);\n      if (this.angle) {\n        p2 = fabric.util.rotatePoint(p2, center, -degreesToRadians(this.angle));\n      }\n      return p2.subtractEquals(p);\n    },\n\n    /**\n     * Returns the point in global coordinates\n     * @param {fabric.Point} The point relative to the local coordinate system\n     * @return {fabric.Point}\n     */\n    // toGlobalPoint: function(point) {\n    //   return fabric.util.rotatePoint(point, this.getCenterPoint(), degreesToRadians(this.angle)).addEquals(new fabric.Point(this.left, this.top));\n    // },\n\n    /**\n     * Sets the position of the object taking into consideration the object's origin\n     * @param {fabric.Point} pos The new position of the object\n     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n     * @return {void}\n     */\n    setPositionByOrigin: function(pos, originX, originY) {\n      var center = this.translateToCenterPoint(pos, originX, originY),\n          position = this.translateToOriginPoint(center, this.originX, this.originY);\n      this.set('left', position.x);\n      this.set('top', position.y);\n    },\n\n    /**\n     * @param {String} to One of 'left', 'center', 'right'\n     */\n    adjustPosition: function(to) {\n      var angle = degreesToRadians(this.angle),\n          hypotFull = this.getScaledWidth(),\n          xFull = fabric.util.cos(angle) * hypotFull,\n          yFull = fabric.util.sin(angle) * hypotFull,\n          offsetFrom, offsetTo;\n\n      //TODO: this function does not consider mixed situation like top, center.\n      if (typeof this.originX === 'string') {\n        offsetFrom = originXOffset[this.originX];\n      }\n      else {\n        offsetFrom = this.originX - 0.5;\n      }\n      if (typeof to === 'string') {\n        offsetTo = originXOffset[to];\n      }\n      else {\n        offsetTo = to - 0.5;\n      }\n      this.left += xFull * (offsetTo - offsetFrom);\n      this.top += yFull * (offsetTo - offsetFrom);\n      this.setCoords();\n      this.originX = to;\n    },\n\n    /**\n     * Sets the origin/position of the object to it's center point\n     * @private\n     * @return {void}\n     */\n    _setOriginToCenter: function() {\n      this._originalOriginX = this.originX;\n      this._originalOriginY = this.originY;\n\n      var center = this.getCenterPoint();\n\n      this.originX = 'center';\n      this.originY = 'center';\n\n      this.left = center.x;\n      this.top = center.y;\n    },\n\n    /**\n     * Resets the origin/position of the object to it's original origin\n     * @private\n     * @return {void}\n     */\n    _resetOrigin: function() {\n      var originPoint = this.translateToOriginPoint(\n        this.getCenterPoint(),\n        this._originalOriginX,\n        this._originalOriginY);\n\n      this.originX = this._originalOriginX;\n      this.originY = this._originalOriginY;\n\n      this.left = originPoint.x;\n      this.top = originPoint.y;\n\n      this._originalOriginX = null;\n      this._originalOriginY = null;\n    },\n\n    /**\n     * @private\n     */\n    _getLeftTopCoords: function() {\n      return this.translateToOriginPoint(this.getCenterPoint(), 'left', 'top');\n    },\n  });\n\n})();\n\n\n(function() {\n\n  function getCoords(coords) {\n    return [\n      new fabric.Point(coords.tl.x, coords.tl.y),\n      new fabric.Point(coords.tr.x, coords.tr.y),\n      new fabric.Point(coords.br.x, coords.br.y),\n      new fabric.Point(coords.bl.x, coords.bl.y)\n    ];\n  }\n\n  var degreesToRadians = fabric.util.degreesToRadians,\n      multiplyMatrices = fabric.util.multiplyTransformMatrices,\n      transformPoint = fabric.util.transformPoint;\n\n  fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n    /**\n     * Describe object's corner position in canvas element coordinates.\n     * properties are tl,mt,tr,ml,mr,bl,mb,br,mtr for the main controls.\n     * each property is an object with x, y and corner.\n     * The `corner` property contains in a similar manner the 4 points of the\n     * interactive area of the corner.\n     * The coordinates depends from this properties: width, height, scaleX, scaleY\n     * skewX, skewY, angle, strokeWidth, viewportTransform, top, left, padding.\n     * The coordinates get updated with @method setCoords.\n     * You can calculate them without updating with @method calcCoords;\n     * @memberOf fabric.Object.prototype\n     */\n    oCoords: null,\n\n    /**\n     * Describe object's corner position in canvas object absolute coordinates\n     * properties are tl,tr,bl,br and describe the four main corner.\n     * each property is an object with x, y, instance of Fabric.Point.\n     * The coordinates depends from this properties: width, height, scaleX, scaleY\n     * skewX, skewY, angle, strokeWidth, top, left.\n     * Those coordinates are useful to understand where an object is. They get updated\n     * with oCoords but they do not need to be updated when zoom or panning change.\n     * The coordinates get updated with @method setCoords.\n     * You can calculate them without updating with @method calcCoords(true);\n     * @memberOf fabric.Object.prototype\n     */\n    aCoords: null,\n\n    /**\n     * storage for object transform matrix\n     */\n    ownMatrixCache: null,\n\n    /**\n     * storage for object full transform matrix\n     */\n    matrixCache: null,\n\n    /**\n     * return correct set of coordinates for intersection\n     */\n    getCoords: function(absolute, calculate) {\n      if (!this.oCoords) {\n        this.setCoords();\n      }\n      var coords = absolute ? this.aCoords : this.oCoords;\n      return getCoords(calculate ? this.calcCoords(absolute) : coords);\n    },\n\n    /**\n     * Checks if object intersects with an area formed by 2 points\n     * @param {Object} pointTL top-left point of area\n     * @param {Object} pointBR bottom-right point of area\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if object intersects with an area formed by 2 points\n     */\n    intersectsWithRect: function(pointTL, pointBR, absolute, calculate) {\n      var coords = this.getCoords(absolute, calculate),\n          intersection = fabric.Intersection.intersectPolygonRectangle(\n            coords,\n            pointTL,\n            pointBR\n          );\n      return intersection.status === 'Intersection';\n    },\n\n    /**\n     * Checks if object intersects with another object\n     * @param {Object} other Object to test\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if object intersects with another object\n     */\n    intersectsWithObject: function(other, absolute, calculate) {\n      var intersection = fabric.Intersection.intersectPolygonPolygon(\n        this.getCoords(absolute, calculate),\n        other.getCoords(absolute, calculate)\n      );\n\n      return intersection.status === 'Intersection'\n        || other.isContainedWithinObject(this, absolute, calculate)\n        || this.isContainedWithinObject(other, absolute, calculate);\n    },\n\n    /**\n     * Checks if object is fully contained within area of another object\n     * @param {Object} other Object to test\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if object is fully contained within area of another object\n     */\n    isContainedWithinObject: function(other, absolute, calculate) {\n      var points = this.getCoords(absolute, calculate),\n          i = 0, lines = other._getImageLines(\n            calculate ? other.calcCoords(absolute) : absolute ? other.aCoords : other.oCoords\n          );\n      for (; i < 4; i++) {\n        if (!other.containsPoint(points[i], lines)) {\n          return false;\n        }\n      }\n      return true;\n    },\n\n    /**\n     * Checks if object is fully contained within area formed by 2 points\n     * @param {Object} pointTL top-left point of area\n     * @param {Object} pointBR bottom-right point of area\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if object is fully contained within area formed by 2 points\n     */\n    isContainedWithinRect: function(pointTL, pointBR, absolute, calculate) {\n      var boundingRect = this.getBoundingRect(absolute, calculate);\n\n      return (\n        boundingRect.left >= pointTL.x &&\n        boundingRect.left + boundingRect.width <= pointBR.x &&\n        boundingRect.top >= pointTL.y &&\n        boundingRect.top + boundingRect.height <= pointBR.y\n      );\n    },\n\n    /**\n     * Checks if point is inside the object\n     * @param {fabric.Point} point Point to check against\n     * @param {Object} [lines] object returned from @method _getImageLines\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if point is inside the object\n     */\n    containsPoint: function(point, lines, absolute, calculate) {\n      var lines = lines || this._getImageLines(\n            calculate ? this.calcCoords(absolute) : absolute ? this.aCoords : this.oCoords\n          ),\n          xPoints = this._findCrossPoints(point, lines);\n\n      // if xPoints is odd then point is inside the object\n      return (xPoints !== 0 && xPoints % 2 === 1);\n    },\n\n    /**\n     * Checks if object is contained within the canvas with current viewportTransform\n     * the check is done stopping at first point that appears on screen\n     * @param {Boolean} [calculate] use coordinates of current position instead of .aCoords\n     * @return {Boolean} true if object is fully or partially contained within canvas\n     */\n    isOnScreen: function(calculate) {\n      if (!this.canvas) {\n        return false;\n      }\n      var pointTL = this.canvas.vptCoords.tl, pointBR = this.canvas.vptCoords.br;\n      var points = this.getCoords(true, calculate), point;\n      for (var i = 0; i < 4; i++) {\n        point = points[i];\n        if (point.x <= pointBR.x && point.x >= pointTL.x && point.y <= pointBR.y && point.y >= pointTL.y) {\n          return true;\n        }\n      }\n      // no points on screen, check intersection with absolute coordinates\n      if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n        return true;\n      }\n      return this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n    },\n\n    /**\n     * Checks if the object contains the midpoint between canvas extremities\n     * Does not make sense outside the context of isOnScreen and isPartiallyOnScreen\n     * @private\n     * @param {Fabric.Point} pointTL Top Left point\n     * @param {Fabric.Point} pointBR Top Right point\n     * @param {Boolean} calculate use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if the object contains the point\n     */\n    _containsCenterOfCanvas: function(pointTL, pointBR, calculate) {\n      // worst case scenario the object is so big that contains the screen\n      var centerPoint = { x: (pointTL.x + pointBR.x) / 2, y: (pointTL.y + pointBR.y) / 2 };\n      if (this.containsPoint(centerPoint, null, true, calculate)) {\n        return true;\n      }\n      return false;\n    },\n\n    /**\n     * Checks if object is partially contained within the canvas with current viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n     * @return {Boolean} true if object is partially contained within canvas\n     */\n    isPartiallyOnScreen: function(calculate) {\n      if (!this.canvas) {\n        return false;\n      }\n      var pointTL = this.canvas.vptCoords.tl, pointBR = this.canvas.vptCoords.br;\n      if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n        return true;\n      }\n      return this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n    },\n\n    /**\n     * Method that returns an object with the object edges in it, given the coordinates of the corners\n     * @private\n     * @param {Object} oCoords Coordinates of the object corners\n     */\n    _getImageLines: function(oCoords) {\n      return {\n        topline: {\n          o: oCoords.tl,\n          d: oCoords.tr\n        },\n        rightline: {\n          o: oCoords.tr,\n          d: oCoords.br\n        },\n        bottomline: {\n          o: oCoords.br,\n          d: oCoords.bl\n        },\n        leftline: {\n          o: oCoords.bl,\n          d: oCoords.tl\n        }\n      };\n    },\n\n    /**\n     * Helper method to determine how many cross points are between the 4 object edges\n     * and the horizontal line determined by a point on canvas\n     * @private\n     * @param {fabric.Point} point Point to check\n     * @param {Object} lines Coordinates of the object being evaluated\n     */\n    // remove yi, not used but left code here just in case.\n    _findCrossPoints: function(point, lines) {\n      var b1, b2, a1, a2, xi, // yi,\n          xcount = 0,\n          iLine;\n\n      for (var lineKey in lines) {\n        iLine = lines[lineKey];\n        // optimisation 1: line below point. no cross\n        if ((iLine.o.y < point.y) && (iLine.d.y < point.y)) {\n          continue;\n        }\n        // optimisation 2: line above point. no cross\n        if ((iLine.o.y >= point.y) && (iLine.d.y >= point.y)) {\n          continue;\n        }\n        // optimisation 3: vertical line case\n        if ((iLine.o.x === iLine.d.x) && (iLine.o.x >= point.x)) {\n          xi = iLine.o.x;\n          // yi = point.y;\n        }\n        // calculate the intersection point\n        else {\n          b1 = 0;\n          b2 = (iLine.d.y - iLine.o.y) / (iLine.d.x - iLine.o.x);\n          a1 = point.y - b1 * point.x;\n          a2 = iLine.o.y - b2 * iLine.o.x;\n\n          xi = -(a1 - a2) / (b1 - b2);\n          // yi = a1 + b1 * xi;\n        }\n        // dont count xi < point.x cases\n        if (xi >= point.x) {\n          xcount += 1;\n        }\n        // optimisation 4: specific for square images\n        if (xcount === 2) {\n          break;\n        }\n      }\n      return xcount;\n    },\n\n    /**\n     * Returns coordinates of object's bounding rectangle (left, top, width, height)\n     * the box is intended as aligned to axis of canvas.\n     * @param {Boolean} [absolute] use coordinates without viewportTransform\n     * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords / .aCoords\n     * @return {Object} Object with left, top, width, height properties\n     */\n    getBoundingRect: function(absolute, calculate) {\n      var coords = this.getCoords(absolute, calculate);\n      return fabric.util.makeBoundingBoxFromPoints(coords);\n    },\n\n    /**\n     * Returns width of an object's bounding box counting transformations\n     * before 2.0 it was named getWidth();\n     * @return {Number} width value\n     */\n    getScaledWidth: function() {\n      return this._getTransformedDimensions().x;\n    },\n\n    /**\n     * Returns height of an object bounding box counting transformations\n     * before 2.0 it was named getHeight();\n     * @return {Number} height value\n     */\n    getScaledHeight: function() {\n      return this._getTransformedDimensions().y;\n    },\n\n    /**\n     * Makes sure the scale is valid and modifies it if necessary\n     * @private\n     * @param {Number} value\n     * @return {Number}\n     */\n    _constrainScale: function(value) {\n      if (Math.abs(value) < this.minScaleLimit) {\n        if (value < 0) {\n          return -this.minScaleLimit;\n        }\n        else {\n          return this.minScaleLimit;\n        }\n      }\n      else if (value === 0) {\n        return 0.0001;\n      }\n      return value;\n    },\n\n    /**\n     * Scales an object (equally by x and y)\n     * @param {Number} value Scale factor\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    scale: function(value) {\n      this._set('scaleX', value);\n      this._set('scaleY', value);\n      return this.setCoords();\n    },\n\n    /**\n     * Scales an object to a given width, with respect to bounding box (scaling by x/y equally)\n     * @param {Number} value New width value\n     * @param {Boolean} absolute ignore viewport\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    scaleToWidth: function(value, absolute) {\n      // adjust to bounding rect factor so that rotated shapes would fit as well\n      var boundingRectFactor = this.getBoundingRect(absolute).width / this.getScaledWidth();\n      return this.scale(value / this.width / boundingRectFactor);\n    },\n\n    /**\n     * Scales an object to a given height, with respect to bounding box (scaling by x/y equally)\n     * @param {Number} value New height value\n     * @param {Boolean} absolute ignore viewport\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    scaleToHeight: function(value, absolute) {\n      // adjust to bounding rect factor so that rotated shapes would fit as well\n      var boundingRectFactor = this.getBoundingRect(absolute).height / this.getScaledHeight();\n      return this.scale(value / this.height / boundingRectFactor);\n    },\n\n    /**\n     * Calculates and returns the .coords of an object.\n     * @return {Object} Object with tl, tr, br, bl ....\n     * @chainable\n     */\n    calcCoords: function(absolute) {\n      var rotateMatrix = this._calcRotateMatrix(),\n          translateMatrix = this._calcTranslateMatrix(),\n          startMatrix = multiplyMatrices(translateMatrix, rotateMatrix),\n          vpt = this.getViewportTransform(),\n          finalMatrix = absolute ? startMatrix : multiplyMatrices(vpt, startMatrix),\n          dim = this._getTransformedDimensions(),\n          w = dim.x / 2, h = dim.y / 2,\n          tl = transformPoint({ x: -w, y: -h }, finalMatrix),\n          tr = transformPoint({ x: w, y: -h }, finalMatrix),\n          bl = transformPoint({ x: -w, y: h }, finalMatrix),\n          br = transformPoint({ x: w, y: h }, finalMatrix);\n      if (!absolute) {\n        var padding = this.padding, angle = degreesToRadians(this.angle),\n            cos = fabric.util.cos(angle), sin = fabric.util.sin(angle),\n            cosP = cos * padding, sinP = sin * padding, cosPSinP = cosP + sinP,\n            cosPMinusSinP = cosP - sinP;\n        if (padding) {\n          tl.x -= cosPMinusSinP;\n          tl.y -= cosPSinP;\n          tr.x += cosPSinP;\n          tr.y -= cosPMinusSinP;\n          bl.x -= cosPSinP;\n          bl.y += cosPMinusSinP;\n          br.x += cosPMinusSinP;\n          br.y += cosPSinP;\n        }\n        var ml  = new fabric.Point((tl.x + bl.x) / 2, (tl.y + bl.y) / 2),\n            mt  = new fabric.Point((tr.x + tl.x) / 2, (tr.y + tl.y) / 2),\n            mr  = new fabric.Point((br.x + tr.x) / 2, (br.y + tr.y) / 2),\n            mb  = new fabric.Point((br.x + bl.x) / 2, (br.y + bl.y) / 2),\n            mtr = new fabric.Point(mt.x + sin * this.rotatingPointOffset, mt.y - cos * this.rotatingPointOffset);\n      }\n\n      // if (!absolute) {\n      //   var canvas = this.canvas;\n      //   setTimeout(function() {\n      //     canvas.contextTop.clearRect(0, 0, 700, 700);\n      //     canvas.contextTop.fillStyle = 'green';\n      //     canvas.contextTop.fillRect(mb.x, mb.y, 3, 3);\n      //     canvas.contextTop.fillRect(bl.x, bl.y, 3, 3);\n      //     canvas.contextTop.fillRect(br.x, br.y, 3, 3);\n      //     canvas.contextTop.fillRect(tl.x, tl.y, 3, 3);\n      //     canvas.contextTop.fillRect(tr.x, tr.y, 3, 3);\n      //     canvas.contextTop.fillRect(ml.x, ml.y, 3, 3);\n      //     canvas.contextTop.fillRect(mr.x, mr.y, 3, 3);\n      //     canvas.contextTop.fillRect(mt.x, mt.y, 3, 3);\n      //     canvas.contextTop.fillRect(mtr.x, mtr.y, 3, 3);\n      //   }, 50);\n      // }\n\n      var coords = {\n        // corners\n        tl: tl, tr: tr, br: br, bl: bl,\n      };\n      if (!absolute) {\n        // middle\n        coords.ml = ml;\n        coords.mt = mt;\n        coords.mr = mr;\n        coords.mb = mb;\n        // rotating point\n        coords.mtr = mtr;\n      }\n      return coords;\n    },\n\n    /**\n     * Sets corner position coordinates based on current angle, width and height.\n     * See {@link https://github.com/kangax/fabric.js/wiki/When-to-call-setCoords|When-to-call-setCoords}\n     * @param {Boolean} [ignoreZoom] set oCoords with or without the viewport transform.\n     * @param {Boolean} [skipAbsolute] skip calculation of aCoords, useful in setViewportTransform\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    setCoords: function(ignoreZoom, skipAbsolute) {\n      this.oCoords = this.calcCoords(ignoreZoom);\n      if (!skipAbsolute) {\n        this.aCoords = this.calcCoords(true);\n      }\n\n      // set coordinates of the draggable boxes in the corners used to scale/rotate the image\n      ignoreZoom || (this._setCornerCoords && this._setCornerCoords());\n\n      return this;\n    },\n\n    /**\n     * calculate rotation matrix of an object\n     * @return {Array} rotation matrix for the object\n     */\n    _calcRotateMatrix: function() {\n      if (this.angle) {\n        var theta = degreesToRadians(this.angle), cos = fabric.util.cos(theta), sin = fabric.util.sin(theta);\n        return [cos, sin, -sin, cos, 0, 0];\n      }\n      return fabric.iMatrix.concat();\n    },\n\n    /**\n     * calculate the translation matrix for an object transform\n     * @return {Array} rotation matrix for the object\n     */\n    _calcTranslateMatrix: function() {\n      var center = this.getCenterPoint();\n      return [1, 0, 0, 1, center.x, center.y];\n    },\n\n    transformMatrixKey: function(skipGroup) {\n      var sep = '_', prefix = '';\n      if (!skipGroup && this.group) {\n        prefix = this.group.transformMatrixKey(skipGroup) + sep;\n      };\n      return prefix + this.top + sep + this.left + sep + this.scaleX + sep + this.scaleY +\n        sep + this.skewX + sep + this.skewY + sep + this.angle + sep + this.originX + sep + this.originY +\n        sep + this.width + sep + this.height + sep + this.strokeWidth + this.flipX + this.flipY;\n    },\n\n    /**\n     * calculate transform matrix that represents the current transformations from the\n     * object's properties.\n     * @param {Boolean} [skipGroup] return transform matrix for object not counting parent transformations\n     * @return {Array} transform matrix for the object\n     */\n    calcTransformMatrix: function(skipGroup) {\n      if (skipGroup) {\n        return this.calcOwnMatrix();\n      }\n      var key = this.transformMatrixKey(), cache = this.matrixCache || (this.matrixCache = {});\n      if (cache.key === key) {\n        return cache.value;\n      }\n      var matrix = this.calcOwnMatrix();\n      if (this.group) {\n        matrix = multiplyMatrices(this.group.calcTransformMatrix(), matrix);\n      }\n      cache.key = key;\n      cache.value = matrix;\n      return matrix;\n    },\n\n    calcOwnMatrix: function() {\n      var key = this.transformMatrixKey(true), cache = this.ownMatrixCache || (this.ownMatrixCache = {});\n      if (cache.key === key) {\n        return cache.value;\n      }\n      var matrix = this._calcTranslateMatrix(),\n          rotateMatrix,\n          dimensionMatrix = this._calcDimensionsTransformMatrix(this.skewX, this.skewY, true);\n      if (this.angle) {\n        rotateMatrix = this._calcRotateMatrix();\n        matrix = multiplyMatrices(matrix, rotateMatrix);\n      }\n      matrix = multiplyMatrices(matrix, dimensionMatrix);\n      cache.key = key;\n      cache.value = matrix;\n      return matrix;\n    },\n\n    _calcDimensionsTransformMatrix: function(skewX, skewY, flipping) {\n      var skewMatrix,\n          scaleX = this.scaleX * (flipping && this.flipX ? -1 : 1),\n          scaleY = this.scaleY * (flipping && this.flipY ? -1 : 1),\n          scaleMatrix = [scaleX, 0, 0, scaleY, 0, 0];\n      if (skewX) {\n        skewMatrix = [1, 0, Math.tan(degreesToRadians(skewX)), 1];\n        scaleMatrix = multiplyMatrices(scaleMatrix, skewMatrix, true);\n      }\n      if (skewY) {\n        skewMatrix = [1, Math.tan(degreesToRadians(skewY)), 0, 1];\n        scaleMatrix = multiplyMatrices(scaleMatrix, skewMatrix, true);\n      }\n      return scaleMatrix;\n    },\n\n\n    /*\n     * Calculate object dimensions from its properties\n     * @private\n     * @return {Object} .x width dimension\n     * @return {Object} .y height dimension\n     */\n    _getNonTransformedDimensions: function() {\n      var strokeWidth = this.strokeWidth,\n          w = this.width + strokeWidth,\n          h = this.height + strokeWidth;\n      return { x: w, y: h };\n    },\n\n    /*\n     * Calculate object bounding box dimensions from its properties scale, skew.\n     * @param {Number} skewX, a value to override current skewX\n     * @param {Number} skewY, a value to override current skewY\n     * @private\n     * @return {Object} .x width dimension\n     * @return {Object} .y height dimension\n     */\n    _getTransformedDimensions: function(skewX, skewY) {\n      if (typeof skewX === 'undefined') {\n        skewX = this.skewX;\n      }\n      if (typeof skewY === 'undefined') {\n        skewY = this.skewY;\n      }\n      var dimensions = this._getNonTransformedDimensions(), dimX, dimY,\n          noSkew = skewX === 0 && skewY === 0;\n\n      if (this.strokeUniform) {\n        dimX = this.width;\n        dimY = this.height;\n      }\n      else {\n        dimX = dimensions.x;\n        dimY = dimensions.y;\n      }\n      if (noSkew) {\n        return this._finalizeDimensions(dimX * this.scaleX, dimY * this.scaleY);\n      }\n      else {\n        dimX /= 2;\n        dimY /= 2;\n      }\n      var points = [\n            {\n              x: -dimX,\n              y: -dimY\n            },\n            {\n              x: dimX,\n              y: -dimY\n            },\n            {\n              x: -dimX,\n              y: dimY\n            },\n            {\n              x: dimX,\n              y: dimY\n            }],\n          i, transformMatrix = this._calcDimensionsTransformMatrix(skewX, skewY, false),\n          bbox;\n      for (i = 0; i < points.length; i++) {\n        points[i] = fabric.util.transformPoint(points[i], transformMatrix);\n      }\n      bbox = fabric.util.makeBoundingBoxFromPoints(points);\n      return this._finalizeDimensions(bbox.width, bbox.height);\n    },\n\n    /*\n     * Calculate object bounding box dimensions from its properties scale, skew.\n     * @param Number width width of the bbox\n     * @param Number height height of the bbox\n     * @private\n     * @return {Object} .x finalized width dimension\n     * @return {Object} .y finalized height dimension\n     */\n    _finalizeDimensions: function(width, height) {\n      return this.strokeUniform ?\n        { x: width + this.strokeWidth, y: height + this.strokeWidth }\n        :\n        { x: width, y: height };\n    },\n    /*\n     * Calculate object dimensions for controls, including padding and canvas zoom.\n     * private\n     */\n    _calculateCurrentDimensions: function()  {\n      var vpt = this.getViewportTransform(),\n          dim = this._getTransformedDimensions(),\n          p = fabric.util.transformPoint(dim, vpt, true);\n\n      return p.scalarAdd(2 * this.padding);\n    },\n  });\n})();\n\n\nfabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n  /**\n   * Moves an object to the bottom of the stack of drawn objects\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  sendToBack: function() {\n    if (this.group) {\n      fabric.StaticCanvas.prototype.sendToBack.call(this.group, this);\n    }\n    else {\n      this.canvas.sendToBack(this);\n    }\n    return this;\n  },\n\n  /**\n   * Moves an object to the top of the stack of drawn objects\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  bringToFront: function() {\n    if (this.group) {\n      fabric.StaticCanvas.prototype.bringToFront.call(this.group, this);\n    }\n    else {\n      this.canvas.bringToFront(this);\n    }\n    return this;\n  },\n\n  /**\n   * Moves an object down in stack of drawn objects\n   * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  sendBackwards: function(intersecting) {\n    if (this.group) {\n      fabric.StaticCanvas.prototype.sendBackwards.call(this.group, this, intersecting);\n    }\n    else {\n      this.canvas.sendBackwards(this, intersecting);\n    }\n    return this;\n  },\n\n  /**\n   * Moves an object up in stack of drawn objects\n   * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  bringForward: function(intersecting) {\n    if (this.group) {\n      fabric.StaticCanvas.prototype.bringForward.call(this.group, this, intersecting);\n    }\n    else {\n      this.canvas.bringForward(this, intersecting);\n    }\n    return this;\n  },\n\n  /**\n   * Moves an object to specified level in stack of drawn objects\n   * @param {Number} index New position of object\n   * @return {fabric.Object} thisArg\n   * @chainable\n   */\n  moveTo: function(index) {\n    if (this.group && this.group.type !== 'activeSelection') {\n      fabric.StaticCanvas.prototype.moveTo.call(this.group, this, index);\n    }\n    else {\n      this.canvas.moveTo(this, index);\n    }\n    return this;\n  }\n});\n\n\n/* _TO_SVG_START_ */\n(function() {\n  function getSvgColorString(prop, value) {\n    if (!value) {\n      return prop + ': none; ';\n    }\n    else if (value.toLive) {\n      return prop + ': url(#SVGID_' + value.id + '); ';\n    }\n    else {\n      var color = new fabric.Color(value),\n          str = prop + ': ' + color.toRgb() + '; ',\n          opacity = color.getAlpha();\n      if (opacity !== 1) {\n        //change the color in rgb + opacity\n        str += prop + '-opacity: ' + opacity.toString() + '; ';\n      }\n      return str;\n    }\n  }\n\n  var toFixed = fabric.util.toFixed;\n\n  fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n    /**\n     * Returns styles-string for svg-export\n     * @param {Boolean} skipShadow a boolean to skip shadow filter output\n     * @return {String}\n     */\n    getSvgStyles: function(skipShadow) {\n\n      var fillRule = this.fillRule ? this.fillRule : 'nonzero',\n          strokeWidth = this.strokeWidth ? this.strokeWidth : '0',\n          strokeDashArray = this.strokeDashArray ? this.strokeDashArray.join(' ') : 'none',\n          strokeDashOffset = this.strokeDashOffset ? this.strokeDashOffset : '0',\n          strokeLineCap = this.strokeLineCap ? this.strokeLineCap : 'butt',\n          strokeLineJoin = this.strokeLineJoin ? this.strokeLineJoin : 'miter',\n          strokeMiterLimit = this.strokeMiterLimit ? this.strokeMiterLimit : '4',\n          opacity = typeof this.opacity !== 'undefined' ? this.opacity : '1',\n          visibility = this.visible ? '' : ' visibility: hidden;',\n          filter = skipShadow ? '' : this.getSvgFilter(),\n          fill = getSvgColorString('fill', this.fill),\n          stroke = getSvgColorString('stroke', this.stroke);\n\n      return [\n        stroke,\n        'stroke-width: ', strokeWidth, '; ',\n        'stroke-dasharray: ', strokeDashArray, '; ',\n        'stroke-linecap: ', strokeLineCap, '; ',\n        'stroke-dashoffset: ', strokeDashOffset, '; ',\n        'stroke-linejoin: ', strokeLineJoin, '; ',\n        'stroke-miterlimit: ', strokeMiterLimit, '; ',\n        fill,\n        'fill-rule: ', fillRule, '; ',\n        'opacity: ', opacity, ';',\n        filter,\n        visibility\n      ].join('');\n    },\n\n    /**\n     * Returns styles-string for svg-export\n     * @param {Object} style the object from which to retrieve style properties\n     * @param {Boolean} useWhiteSpace a boolean to include an additional attribute in the style.\n     * @return {String}\n     */\n    getSvgSpanStyles: function(style, useWhiteSpace) {\n      var term = '; ';\n      var fontFamily = style.fontFamily ?\n        'font-family: ' + (((style.fontFamily.indexOf('\\'') === -1 && style.fontFamily.indexOf('\"') === -1) ?\n          '\\'' + style.fontFamily  + '\\'' : style.fontFamily)) + term : '';\n      var strokeWidth = style.strokeWidth ? 'stroke-width: ' + style.strokeWidth + term : '',\n          fontFamily = fontFamily,\n          fontSize = style.fontSize ? 'font-size: ' + style.fontSize + 'px' + term : '',\n          fontStyle = style.fontStyle ? 'font-style: ' + style.fontStyle + term : '',\n          fontWeight = style.fontWeight ? 'font-weight: ' + style.fontWeight + term : '',\n          fill = style.fill ? getSvgColorString('fill', style.fill) : '',\n          stroke = style.stroke ? getSvgColorString('stroke', style.stroke) : '',\n          textDecoration = this.getSvgTextDecoration(style),\n          deltaY = style.deltaY ? 'baseline-shift: ' + (-style.deltaY) + '; ' : '';\n      if (textDecoration) {\n        textDecoration = 'text-decoration: ' + textDecoration + term;\n      }\n\n      return [\n        stroke,\n        strokeWidth,\n        fontFamily,\n        fontSize,\n        fontStyle,\n        fontWeight,\n        textDecoration,\n        fill,\n        deltaY,\n        useWhiteSpace ? 'white-space: pre; ' : ''\n      ].join('');\n    },\n\n    /**\n     * Returns text-decoration property for svg-export\n     * @param {Object} style the object from which to retrieve style properties\n     * @return {String}\n     */\n    getSvgTextDecoration: function(style) {\n      if ('overline' in style || 'underline' in style || 'linethrough' in style) {\n        return (style.overline ? 'overline ' : '') +\n          (style.underline ? 'underline ' : '') + (style.linethrough ? 'line-through ' : '');\n      }\n      return '';\n    },\n\n    /**\n     * Returns filter for svg shadow\n     * @return {String}\n     */\n    getSvgFilter: function() {\n      return this.shadow ? 'filter: url(#SVGID_' + this.shadow.id + ');' : '';\n    },\n\n    /**\n     * Returns id attribute for svg output\n     * @return {String}\n     */\n    getSvgCommons: function() {\n      return [\n        this.id ? 'id=\"' + this.id + '\" ' : '',\n        this.clipPath ? 'clip-path=\"url(#' + this.clipPath.clipPathId + ')\" ' : '',\n      ].join('');\n    },\n\n    /**\n     * Returns transform-string for svg-export\n     * @param {Boolean} use the full transform or the single object one.\n     * @return {String}\n     */\n    getSvgTransform: function(full, additionalTransform) {\n      var transform = full ? this.calcTransformMatrix() : this.calcOwnMatrix(),\n          svgTransform = 'transform=\"' + fabric.util.matrixToSVG(transform);\n      return svgTransform +\n        (additionalTransform || '') + this.getSvgTransformMatrix() + '\" ';\n    },\n\n    /**\n     * Returns transform-string for svg-export from the transform matrix of single elements\n     * @return {String}\n     */\n    getSvgTransformMatrix: function() {\n      return this.transformMatrix ? ' ' + fabric.util.matrixToSVG(this.transformMatrix) : '';\n    },\n\n    _setSVGBg: function(textBgRects) {\n      if (this.backgroundColor) {\n        var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n        textBgRects.push(\n          '\\t\\t<rect ',\n          this._getFillAttributes(this.backgroundColor),\n          ' x=\"',\n          toFixed(-this.width / 2, NUM_FRACTION_DIGITS),\n          '\" y=\"',\n          toFixed(-this.height / 2, NUM_FRACTION_DIGITS),\n          '\" width=\"',\n          toFixed(this.width, NUM_FRACTION_DIGITS),\n          '\" height=\"',\n          toFixed(this.height, NUM_FRACTION_DIGITS),\n          '\"></rect>\\n');\n      }\n    },\n\n    /**\n     * Returns svg representation of an instance\n     * @param {Function} [reviver] Method for further parsing of svg representation.\n     * @return {String} svg representation of an instance\n     */\n    toSVG: function(reviver) {\n      return this._createBaseSVGMarkup(this._toSVG(reviver), { reviver: reviver });\n    },\n\n    /**\n     * Returns svg clipPath representation of an instance\n     * @param {Function} [reviver] Method for further parsing of svg representation.\n     * @return {String} svg representation of an instance\n     */\n    toClipPathSVG: function(reviver) {\n      return '\\t' + this._createBaseClipPathSVGMarkup(this._toSVG(reviver), { reviver: reviver });\n    },\n\n    /**\n     * @private\n     */\n    _createBaseClipPathSVGMarkup: function(objectMarkup, options) {\n      options = options || {};\n      var reviver = options.reviver,\n          additionalTransform = options.additionalTransform || '',\n          commonPieces = [\n            this.getSvgTransform(true, additionalTransform),\n            this.getSvgCommons(),\n          ].join(''),\n          // insert commons in the markup, style and svgCommons\n          index = objectMarkup.indexOf('COMMON_PARTS');\n      objectMarkup[index] = commonPieces;\n      return reviver ? reviver(objectMarkup.join('')) : objectMarkup.join('');\n    },\n\n    /**\n     * @private\n     */\n    _createBaseSVGMarkup: function(objectMarkup, options) {\n      options = options || {};\n      var noStyle = options.noStyle,\n          reviver = options.reviver,\n          styleInfo = noStyle ? '' : 'style=\"' + this.getSvgStyles() + '\" ',\n          shadowInfo = options.withShadow ? 'style=\"' + this.getSvgFilter() + '\" ' : '',\n          clipPath = this.clipPath,\n          vectorEffect = this.strokeUniform ? 'vector-effect=\"non-scaling-stroke\" ' : '',\n          absoluteClipPath = clipPath && clipPath.absolutePositioned,\n          stroke = this.stroke, fill = this.fill, shadow = this.shadow,\n          commonPieces, markup = [], clipPathMarkup,\n          // insert commons in the markup, style and svgCommons\n          index = objectMarkup.indexOf('COMMON_PARTS'),\n          additionalTransform = options.additionalTransform;\n      if (clipPath) {\n        clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n        clipPathMarkup = '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' +\n          clipPath.toClipPathSVG(reviver) +\n          '</clipPath>\\n';\n      }\n      if (absoluteClipPath) {\n        markup.push(\n          '<g ', shadowInfo, this.getSvgCommons(), ' >\\n'\n        );\n      }\n      markup.push(\n        '<g ',\n        this.getSvgTransform(false),\n        !absoluteClipPath ? shadowInfo + this.getSvgCommons() : '',\n        ' >\\n'\n      );\n      commonPieces = [\n        styleInfo,\n        vectorEffect,\n        noStyle ? '' : this.addPaintOrder(), ' ',\n        additionalTransform ? 'transform=\"' + additionalTransform + '\" ' : '',\n      ].join('');\n      objectMarkup[index] = commonPieces;\n      if (fill && fill.toLive) {\n        markup.push(fill.toSVG(this));\n      }\n      if (stroke && stroke.toLive) {\n        markup.push(stroke.toSVG(this));\n      }\n      if (shadow) {\n        markup.push(shadow.toSVG(this));\n      }\n      if (clipPath) {\n        markup.push(clipPathMarkup);\n      }\n      markup.push(objectMarkup.join(''));\n      markup.push('</g>\\n');\n      absoluteClipPath && markup.push('</g>\\n');\n      return reviver ? reviver(markup.join('')) : markup.join('');\n    },\n\n    addPaintOrder: function() {\n      return this.paintFirst !== 'fill' ? ' paint-order=\"' + this.paintFirst + '\" ' : '';\n    }\n  });\n})();\n/* _TO_SVG_END_ */\n\n\n(function() {\n\n  var extend = fabric.util.object.extend,\n      originalSet = 'stateProperties';\n\n  /*\n    Depends on `stateProperties`\n  */\n  function saveProps(origin, destination, props) {\n    var tmpObj = { }, deep = true;\n    props.forEach(function(prop) {\n      tmpObj[prop] = origin[prop];\n    });\n    extend(origin[destination], tmpObj, deep);\n  }\n\n  function _isEqual(origValue, currentValue, firstPass) {\n    if (origValue === currentValue) {\n      // if the objects are identical, return\n      return true;\n    }\n    else if (Array.isArray(origValue)) {\n      if (!Array.isArray(currentValue) || origValue.length !== currentValue.length) {\n        return false;\n      }\n      for (var i = 0, len = origValue.length; i < len; i++) {\n        if (!_isEqual(origValue[i], currentValue[i])) {\n          return false;\n        }\n      }\n      return true;\n    }\n    else if (origValue && typeof origValue === 'object') {\n      var keys = Object.keys(origValue), key;\n      if (!currentValue ||\n          typeof currentValue !== 'object' ||\n          (!firstPass && keys.length !== Object.keys(currentValue).length)\n      ) {\n        return false;\n      }\n      for (var i = 0, len = keys.length; i < len; i++) {\n        key = keys[i];\n        // since clipPath is in the statefull cache list and the clipPath objects\n        // would be iterated as an object, this would lead to possible infinite recursion\n        if (key === 'canvas') {\n          continue;\n        }\n        if (!_isEqual(origValue[key], currentValue[key])) {\n          return false;\n        }\n      }\n      return true;\n    }\n  }\n\n\n  fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n    /**\n     * Returns true if object state (one of its state properties) was changed\n     * @param {String} [propertySet] optional name for the set of property we want to save\n     * @return {Boolean} true if instance' state has changed since `{@link fabric.Object#saveState}` was called\n     */\n    hasStateChanged: function(propertySet) {\n      propertySet = propertySet || originalSet;\n      var dashedPropertySet = '_' + propertySet;\n      if (Object.keys(this[dashedPropertySet]).length < this[propertySet].length) {\n        return true;\n      }\n      return !_isEqual(this[dashedPropertySet], this, true);\n    },\n\n    /**\n     * Saves state of an object\n     * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n     * @return {fabric.Object} thisArg\n     */\n    saveState: function(options) {\n      var propertySet = options && options.propertySet || originalSet,\n          destination = '_' + propertySet;\n      if (!this[destination]) {\n        return this.setupState(options);\n      }\n      saveProps(this, destination, this[propertySet]);\n      if (options && options.stateProperties) {\n        saveProps(this, destination, options.stateProperties);\n      }\n      return this;\n    },\n\n    /**\n     * Setups state of an object\n     * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n     * @return {fabric.Object} thisArg\n     */\n    setupState: function(options) {\n      options = options || { };\n      var propertySet = options.propertySet || originalSet;\n      options.propertySet = propertySet;\n      this['_' + propertySet] = { };\n      this.saveState(options);\n      return this;\n    }\n  });\n})();\n\n\n(function() {\n\n  var degreesToRadians = fabric.util.degreesToRadians;\n\n  fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n    /**\n     * The object interactivity controls.\n     * @private\n     */\n    _controlsVisibility: null,\n\n    /**\n     * Determines which corner has been clicked\n     * @private\n     * @param {Object} pointer The pointer indicating the mouse position\n     * @return {String|Boolean} corner code (tl, tr, bl, br, etc.), or false if nothing is found\n     */\n    _findTargetCorner: function(pointer) {\n      // objects in group, anykind, are not self modificable,\n      // must not return an hovered corner.\n      if (!this.hasControls || this.group || (!this.canvas || this.canvas._activeObject !== this)) {\n        return false;\n      }\n\n      var ex = pointer.x,\n          ey = pointer.y,\n          xPoints,\n          lines;\n      this.__corner = 0;\n      for (var i in this.oCoords) {\n\n        if (!this.isControlVisible(i)) {\n          continue;\n        }\n\n        if (i === 'mtr' && !this.hasRotatingPoint) {\n          continue;\n        }\n\n        if (this.get('lockUniScaling') &&\n           (i === 'mt' || i === 'mr' || i === 'mb' || i === 'ml')) {\n          continue;\n        }\n\n        lines = this._getImageLines(this.oCoords[i].corner);\n\n        // debugging\n\n        // canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);\n        // canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);\n\n        // canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);\n        // canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);\n\n        // canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);\n        // canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);\n\n        // canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);\n        // canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);\n\n        xPoints = this._findCrossPoints({ x: ex, y: ey }, lines);\n        if (xPoints !== 0 && xPoints % 2 === 1) {\n          this.__corner = i;\n          return i;\n        }\n      }\n      return false;\n    },\n\n    /**\n     * Sets the coordinates of the draggable boxes in the corners of\n     * the image used to scale/rotate it.\n     * @private\n     */\n    _setCornerCoords: function() {\n      var coords = this.oCoords,\n          newTheta = degreesToRadians(45 - this.angle),\n          /* Math.sqrt(2 * Math.pow(this.cornerSize, 2)) / 2, */\n          /* 0.707106 stands for sqrt(2)/2 */\n          cornerHypotenuse = this.cornerSize * 0.707106,\n          cosHalfOffset = cornerHypotenuse * fabric.util.cos(newTheta),\n          sinHalfOffset = cornerHypotenuse * fabric.util.sin(newTheta),\n          x, y;\n\n      for (var point in coords) {\n        x = coords[point].x;\n        y = coords[point].y;\n        coords[point].corner = {\n          tl: {\n            x: x - sinHalfOffset,\n            y: y - cosHalfOffset\n          },\n          tr: {\n            x: x + cosHalfOffset,\n            y: y - sinHalfOffset\n          },\n          bl: {\n            x: x - cosHalfOffset,\n            y: y + sinHalfOffset\n          },\n          br: {\n            x: x + sinHalfOffset,\n            y: y + cosHalfOffset\n          }\n        };\n      }\n    },\n\n    /**\n     * Draws a colored layer behind the object, inside its selection borders.\n     * Requires public options: padding, selectionBackgroundColor\n     * this function is called when the context is transformed\n     * has checks to be skipped when the object is on a staticCanvas\n     * @param {CanvasRenderingContext2D} ctx Context to draw on\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    drawSelectionBackground: function(ctx) {\n      if (!this.selectionBackgroundColor ||\n        (this.canvas && !this.canvas.interactive) ||\n        (this.canvas && this.canvas._activeObject !== this)\n      ) {\n        return this;\n      }\n      ctx.save();\n      var center = this.getCenterPoint(), wh = this._calculateCurrentDimensions(),\n          vpt = this.canvas.viewportTransform;\n      ctx.translate(center.x, center.y);\n      ctx.scale(1 / vpt[0], 1 / vpt[3]);\n      ctx.rotate(degreesToRadians(this.angle));\n      ctx.fillStyle = this.selectionBackgroundColor;\n      ctx.fillRect(-wh.x / 2, -wh.y / 2, wh.x, wh.y);\n      ctx.restore();\n      return this;\n    },\n\n    /**\n     * Draws borders of an object's bounding box.\n     * Requires public properties: width, height\n     * Requires public options: padding, borderColor\n     * @param {CanvasRenderingContext2D} ctx Context to draw on\n     * @param {Object} styleOverride object to override the object style\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    drawBorders: function(ctx, styleOverride) {\n      styleOverride = styleOverride || {};\n      var wh = this._calculateCurrentDimensions(),\n          strokeWidth = 1 / this.borderScaleFactor,\n          width = wh.x + strokeWidth,\n          height = wh.y + strokeWidth,\n          drawRotatingPoint = typeof styleOverride.hasRotatingPoint !== 'undefined' ?\n            styleOverride.hasRotatingPoint : this.hasRotatingPoint,\n          hasControls = typeof styleOverride.hasControls !== 'undefined' ?\n            styleOverride.hasControls : this.hasControls,\n          rotatingPointOffset = typeof styleOverride.rotatingPointOffset !== 'undefined' ?\n            styleOverride.rotatingPointOffset : this.rotatingPointOffset;\n\n      ctx.save();\n      ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n      this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n\n      ctx.strokeRect(\n        -width / 2,\n        -height / 2,\n        width,\n        height\n      );\n\n      if (drawRotatingPoint && this.isControlVisible('mtr') && hasControls) {\n\n        var rotateHeight = -height / 2;\n\n        ctx.beginPath();\n        ctx.moveTo(0, rotateHeight);\n        ctx.lineTo(0, rotateHeight - rotatingPointOffset);\n        ctx.stroke();\n      }\n\n      ctx.restore();\n      return this;\n    },\n\n    /**\n     * Draws borders of an object's bounding box when it is inside a group.\n     * Requires public properties: width, height\n     * Requires public options: padding, borderColor\n     * @param {CanvasRenderingContext2D} ctx Context to draw on\n     * @param {object} options object representing current object parameters\n     * @param {Object} styleOverride object to override the object style\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    drawBordersInGroup: function(ctx, options, styleOverride) {\n      styleOverride = styleOverride || {};\n      var p = this._getNonTransformedDimensions(),\n          matrix = fabric.util.customTransformMatrix(options.scaleX, options.scaleY, options.skewX),\n          wh = fabric.util.transformPoint(p, matrix),\n          strokeWidth = 1 / this.borderScaleFactor,\n          width = wh.x + strokeWidth,\n          height = wh.y + strokeWidth;\n\n      ctx.save();\n      this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n      ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n\n      ctx.strokeRect(\n        -width / 2,\n        -height / 2,\n        width,\n        height\n      );\n\n      ctx.restore();\n      return this;\n    },\n\n    /**\n     * Draws corners of an object's bounding box.\n     * Requires public properties: width, height\n     * Requires public options: cornerSize, padding\n     * @param {CanvasRenderingContext2D} ctx Context to draw on\n     * @param {Object} styleOverride object to override the object style\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    drawControls: function(ctx, styleOverride) {\n      styleOverride = styleOverride || {};\n      var wh = this._calculateCurrentDimensions(),\n          width = wh.x,\n          height = wh.y,\n          scaleOffset = styleOverride.cornerSize || this.cornerSize,\n          left = -(width + scaleOffset) / 2,\n          top = -(height + scaleOffset) / 2,\n          transparentCorners = typeof styleOverride.transparentCorners !== 'undefined' ?\n            styleOverride.transparentCorners : this.transparentCorners,\n          hasRotatingPoint = typeof styleOverride.hasRotatingPoint !== 'undefined' ?\n            styleOverride.hasRotatingPoint : this.hasRotatingPoint,\n          methodName = transparentCorners ? 'stroke' : 'fill';\n\n      ctx.save();\n      ctx.strokeStyle = ctx.fillStyle = styleOverride.cornerColor || this.cornerColor;\n      if (!this.transparentCorners) {\n        ctx.strokeStyle = styleOverride.cornerStrokeColor || this.cornerStrokeColor;\n      }\n      this._setLineDash(ctx, styleOverride.cornerDashArray || this.cornerDashArray, null);\n\n      // top-left\n      this._drawControl('tl', ctx, methodName,\n        left,\n        top, styleOverride);\n\n      // top-right\n      this._drawControl('tr', ctx, methodName,\n        left + width,\n        top, styleOverride);\n\n      // bottom-left\n      this._drawControl('bl', ctx, methodName,\n        left,\n        top + height, styleOverride);\n\n      // bottom-right\n      this._drawControl('br', ctx, methodName,\n        left + width,\n        top + height, styleOverride);\n\n      if (!this.get('lockUniScaling')) {\n\n        // middle-top\n        this._drawControl('mt', ctx, methodName,\n          left + width / 2,\n          top, styleOverride);\n\n        // middle-bottom\n        this._drawControl('mb', ctx, methodName,\n          left + width / 2,\n          top + height, styleOverride);\n\n        // middle-right\n        this._drawControl('mr', ctx, methodName,\n          left + width,\n          top + height / 2, styleOverride);\n\n        // middle-left\n        this._drawControl('ml', ctx, methodName,\n          left,\n          top + height / 2, styleOverride);\n      }\n\n      // middle-top-rotate\n      if (hasRotatingPoint) {\n        this._drawControl('mtr', ctx, methodName,\n          left + width / 2,\n          top - this.rotatingPointOffset, styleOverride);\n      }\n\n      ctx.restore();\n\n      return this;\n    },\n\n    /**\n     * @private\n     */\n    _drawControl: function(control, ctx, methodName, left, top, styleOverride) {\n      styleOverride = styleOverride || {};\n      if (!this.isControlVisible(control)) {\n        return;\n      }\n      var size = this.cornerSize, stroke = !this.transparentCorners && this.cornerStrokeColor;\n      switch (styleOverride.cornerStyle || this.cornerStyle) {\n        case 'circle':\n          ctx.beginPath();\n          ctx.arc(left + size / 2, top + size / 2, size / 2, 0, 2 * Math.PI, false);\n          ctx[methodName]();\n          if (stroke) {\n            ctx.stroke();\n          }\n          break;\n        default:\n          this.transparentCorners || ctx.clearRect(left, top, size, size);\n          ctx[methodName + 'Rect'](left, top, size, size);\n          if (stroke) {\n            ctx.strokeRect(left, top, size, size);\n          }\n      }\n    },\n\n    /**\n     * Returns true if the specified control is visible, false otherwise.\n     * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n     * @returns {Boolean} true if the specified control is visible, false otherwise\n     */\n    isControlVisible: function(controlName) {\n      return this._getControlsVisibility()[controlName];\n    },\n\n    /**\n     * Sets the visibility of the specified control.\n     * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n     * @param {Boolean} visible true to set the specified control visible, false otherwise\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    setControlVisible: function(controlName, visible) {\n      this._getControlsVisibility()[controlName] = visible;\n      return this;\n    },\n\n    /**\n     * Sets the visibility state of object controls.\n     * @param {Object} [options] Options object\n     * @param {Boolean} [options.bl] true to enable the bottom-left control, false to disable it\n     * @param {Boolean} [options.br] true to enable the bottom-right control, false to disable it\n     * @param {Boolean} [options.mb] true to enable the middle-bottom control, false to disable it\n     * @param {Boolean} [options.ml] true to enable the middle-left control, false to disable it\n     * @param {Boolean} [options.mr] true to enable the middle-right control, false to disable it\n     * @param {Boolean} [options.mt] true to enable the middle-top control, false to disable it\n     * @param {Boolean} [options.tl] true to enable the top-left control, false to disable it\n     * @param {Boolean} [options.tr] true to enable the top-right control, false to disable it\n     * @param {Boolean} [options.mtr] true to enable the middle-top-rotate control, false to disable it\n     * @return {fabric.Object} thisArg\n     * @chainable\n     */\n    setControlsVisibility: function(options) {\n      options || (options = { });\n\n      for (var p in options) {\n        this.setControlVisible(p, options[p]);\n      }\n      return this;\n    },\n\n    /**\n     * Returns the instance of the control visibility set for this object.\n     * @private\n     * @returns {Object}\n     */\n    _getControlsVisibility: function() {\n      if (!this._controlsVisibility) {\n        this._controlsVisibility = {\n          tl: true,\n          tr: true,\n          br: true,\n          bl: true,\n          ml: true,\n          mt: true,\n          mr: true,\n          mb: true,\n          mtr: true\n        };\n      }\n      return this._controlsVisibility;\n    },\n\n    /**\n     * This callback function is called every time _discardActiveObject or _setActiveObject\n     * try to to deselect this object. If the function returns true, the process is cancelled\n     * @param {Object} [options] options sent from the upper functions\n     * @param {Event} [options.e] event if the process is generated by an event\n     */\n    onDeselect: function() {\n      // implemented by sub-classes, as needed.\n    },\n\n\n    /**\n     * This callback function is called every time _discardActiveObject or _setActiveObject\n     * try to to select this object. If the function returns true, the process is cancelled\n     * @param {Object} [options] options sent from the upper functions\n     * @param {Event} [options.e] event if the process is generated by an event\n     */\n    onSelect: function() {\n      // implemented by sub-classes, as needed.\n    }\n  });\n})();\n\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n  /**\n   * Animation duration (in ms) for fx* methods\n   * @type Number\n   * @default\n   */\n  FX_DURATION: 500,\n\n  /**\n   * Centers object horizontally with animation.\n   * @param {fabric.Object} object Object to center\n   * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n   * @param {Function} [callbacks.onComplete] Invoked on completion\n   * @param {Function} [callbacks.onChange] Invoked on every step of animation\n   * @return {fabric.Canvas} thisArg\n   * @chainable\n   */\n  fxCenterObjectH: function (object, callbacks) {\n    callbacks = callbacks || { };\n\n    var empty = function() { },\n        onComplete = callbacks.onComplete || empty,\n        onChange = callbacks.onChange || empty,\n        _this = this;\n\n    fabric.util.animate({\n      startValue: object.left,\n      endValue: this.getCenter().left,\n      duration: this.FX_DURATION,\n      onChange: function(value) {\n        object.set('left', value);\n        _this.requestRenderAll();\n        onChange();\n      },\n      onComplete: function() {\n        object.setCoords();\n        onComplete();\n      }\n    });\n\n    return this;\n  },\n\n  /**\n   * Centers object vertically with animation.\n   * @param {fabric.Object} object Object to center\n   * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n   * @param {Function} [callbacks.onComplete] Invoked on completion\n   * @param {Function} [callbacks.onChange] Invoked on every step of animation\n   * @return {fabric.Canvas} thisArg\n   * @chainable\n   */\n  fxCenterObjectV: function (object, callbacks) {\n    callbacks = callbacks || { };\n\n    var empty = function() { },\n        onComplete = callbacks.onComplete || empty,\n        onChange = callbacks.onChange || empty,\n        _this = this;\n\n    fabric.util.animate({\n      startValue: object.top,\n      endValue: this.getCenter().top,\n      duration: this.FX_DURATION,\n      onChange: function(value) {\n        object.set('top', value);\n        _this.requestRenderAll();\n        onChange();\n      },\n      onComplete: function() {\n        object.setCoords();\n        onComplete();\n      }\n    });\n\n    return this;\n  },\n\n  /**\n   * Same as `fabric.Canvas#remove` but animated\n   * @param {fabric.Object} object Object to remove\n   * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n   * @param {Function} [callbacks.onComplete] Invoked on completion\n   * @param {Function} [callbacks.onChange] Invoked on every step of animation\n   * @return {fabric.Canvas} thisArg\n   * @chainable\n   */\n  fxRemove: function (object, callbacks) {\n    callbacks = callbacks || { };\n\n    var empty = function() { },\n        onComplete = callbacks.onComplete || empty,\n        onChange = callbacks.onChange || empty,\n        _this = this;\n\n    fabric.util.animate({\n      startValue: object.opacity,\n      endValue: 0,\n      duration: this.FX_DURATION,\n      onChange: function(value) {\n        object.set('opacity', value);\n        _this.requestRenderAll();\n        onChange();\n      },\n      onComplete: function () {\n        _this.remove(object);\n        onComplete();\n      }\n    });\n\n    return this;\n  }\n});\n\nfabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n  /**\n   * Animates object's properties\n   * @param {String|Object} property Property to animate (if string) or properties to animate (if object)\n   * @param {Number|Object} value Value to animate property to (if string was given first) or options object\n   * @return {fabric.Object} thisArg\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#animation}\n   * @chainable\n   *\n   * As object — multiple properties\n   *\n   * object.animate({ left: ..., top: ... });\n   * object.animate({ left: ..., top: ... }, { duration: ... });\n   *\n   * As string — one property\n   *\n   * object.animate('left', ...);\n   * object.animate('left', { duration: ... });\n   *\n   */\n  animate: function() {\n    if (arguments[0] && typeof arguments[0] === 'object') {\n      var propsToAnimate = [], prop, skipCallbacks;\n      for (prop in arguments[0]) {\n        propsToAnimate.push(prop);\n      }\n      for (var i = 0, len = propsToAnimate.length; i < len; i++) {\n        prop = propsToAnimate[i];\n        skipCallbacks = i !== len - 1;\n        this._animate(prop, arguments[0][prop], arguments[1], skipCallbacks);\n      }\n    }\n    else {\n      this._animate.apply(this, arguments);\n    }\n    return this;\n  },\n\n  /**\n   * @private\n   * @param {String} property Property to animate\n   * @param {String} to Value to animate to\n   * @param {Object} [options] Options object\n   * @param {Boolean} [skipCallbacks] When true, callbacks like onchange and oncomplete are not invoked\n   */\n  _animate: function(property, to, options, skipCallbacks) {\n    var _this = this, propPair;\n\n    to = to.toString();\n\n    if (!options) {\n      options = { };\n    }\n    else {\n      options = fabric.util.object.clone(options);\n    }\n\n    if (~property.indexOf('.')) {\n      propPair = property.split('.');\n    }\n\n    var currentValue = propPair\n      ? this.get(propPair[0])[propPair[1]]\n      : this.get(property);\n\n    if (!('from' in options)) {\n      options.from = currentValue;\n    }\n\n    if (~to.indexOf('=')) {\n      to = currentValue + parseFloat(to.replace('=', ''));\n    }\n    else {\n      to = parseFloat(to);\n    }\n\n    fabric.util.animate({\n      startValue: options.from,\n      endValue: to,\n      byValue: options.by,\n      easing: options.easing,\n      duration: options.duration,\n      abort: options.abort && function() {\n        return options.abort.call(_this);\n      },\n      onChange: function(value, valueProgress, timeProgress) {\n        if (propPair) {\n          _this[propPair[0]][propPair[1]] = value;\n        }\n        else {\n          _this.set(property, value);\n        }\n        if (skipCallbacks) {\n          return;\n        }\n        options.onChange && options.onChange(value, valueProgress, timeProgress);\n      },\n      onComplete: function(value, valueProgress, timeProgress) {\n        if (skipCallbacks) {\n          return;\n        }\n\n        _this.setCoords();\n        options.onComplete && options.onComplete(value, valueProgress, timeProgress);\n      }\n    });\n  }\n});\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      extend = fabric.util.object.extend,\n      clone = fabric.util.object.clone,\n      coordProps = { x1: 1, x2: 1, y1: 1, y2: 1 },\n      supportsLineDash = fabric.StaticCanvas.supports('setLineDash');\n\n  if (fabric.Line) {\n    fabric.warn('fabric.Line is already defined');\n    return;\n  }\n\n  /**\n   * Line class\n   * @class fabric.Line\n   * @extends fabric.Object\n   * @see {@link fabric.Line#initialize} for constructor definition\n   */\n  fabric.Line = fabric.util.createClass(fabric.Object, /** @lends fabric.Line.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'line',\n\n    /**\n     * x value or first line edge\n     * @type Number\n     * @default\n     */\n    x1: 0,\n\n    /**\n     * y value or first line edge\n     * @type Number\n     * @default\n     */\n    y1: 0,\n\n    /**\n     * x value or second line edge\n     * @type Number\n     * @default\n     */\n    x2: 0,\n\n    /**\n     * y value or second line edge\n     * @type Number\n     * @default\n     */\n    y2: 0,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('x1', 'x2', 'y1', 'y2'),\n\n    /**\n     * Constructor\n     * @param {Array} [points] Array of points\n     * @param {Object} [options] Options object\n     * @return {fabric.Line} thisArg\n     */\n    initialize: function(points, options) {\n      if (!points) {\n        points = [0, 0, 0, 0];\n      }\n\n      this.callSuper('initialize', options);\n\n      this.set('x1', points[0]);\n      this.set('y1', points[1]);\n      this.set('x2', points[2]);\n      this.set('y2', points[3]);\n\n      this._setWidthHeight(options);\n    },\n\n    /**\n     * @private\n     * @param {Object} [options] Options\n     */\n    _setWidthHeight: function(options) {\n      options || (options = { });\n\n      this.width = Math.abs(this.x2 - this.x1);\n      this.height = Math.abs(this.y2 - this.y1);\n\n      this.left = 'left' in options\n        ? options.left\n        : this._getLeftToOriginX();\n\n      this.top = 'top' in options\n        ? options.top\n        : this._getTopToOriginY();\n    },\n\n    /**\n     * @private\n     * @param {String} key\n     * @param {*} value\n     */\n    _set: function(key, value) {\n      this.callSuper('_set', key, value);\n      if (typeof coordProps[key] !== 'undefined') {\n        this._setWidthHeight();\n      }\n      return this;\n    },\n\n    /**\n     * @private\n     * @return {Number} leftToOriginX Distance from left edge of canvas to originX of Line.\n     */\n    _getLeftToOriginX: makeEdgeToOriginGetter(\n      { // property names\n        origin: 'originX',\n        axis1: 'x1',\n        axis2: 'x2',\n        dimension: 'width'\n      },\n      { // possible values of origin\n        nearest: 'left',\n        center: 'center',\n        farthest: 'right'\n      }\n    ),\n\n    /**\n     * @private\n     * @return {Number} topToOriginY Distance from top edge of canvas to originY of Line.\n     */\n    _getTopToOriginY: makeEdgeToOriginGetter(\n      { // property names\n        origin: 'originY',\n        axis1: 'y1',\n        axis2: 'y2',\n        dimension: 'height'\n      },\n      { // possible values of origin\n        nearest: 'top',\n        center: 'center',\n        farthest: 'bottom'\n      }\n    ),\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(ctx) {\n      ctx.beginPath();\n\n      if (!this.strokeDashArray || this.strokeDashArray && supportsLineDash) {\n        // move from center (of virtual box) to its left/top corner\n        // we can't assume x1, y1 is top left and x2, y2 is bottom right\n        var p = this.calcLinePoints();\n        ctx.moveTo(p.x1, p.y1);\n        ctx.lineTo(p.x2, p.y2);\n      }\n\n      ctx.lineWidth = this.strokeWidth;\n\n      // TODO: test this\n      // make sure setting \"fill\" changes color of a line\n      // (by copying fillStyle to strokeStyle, since line is stroked, not filled)\n      var origStrokeStyle = ctx.strokeStyle;\n      ctx.strokeStyle = this.stroke || ctx.fillStyle;\n      this.stroke && this._renderStroke(ctx);\n      ctx.strokeStyle = origStrokeStyle;\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderDashedStroke: function(ctx) {\n      var p = this.calcLinePoints();\n\n      ctx.beginPath();\n      fabric.util.drawDashedLine(ctx, p.x1, p.y1, p.x2, p.y2, this.strokeDashArray);\n      ctx.closePath();\n    },\n\n    /**\n     * This function is an helper for svg import. it returns the center of the object in the svg\n     * untransformed coordinates\n     * @private\n     * @return {Object} center point from element coordinates\n     */\n    _findCenterFromElement: function() {\n      return {\n        x: (this.x1 + this.x2) / 2,\n        y: (this.y1 + this.y2) / 2,\n      };\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @methd toObject\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return extend(this.callSuper('toObject', propertiesToInclude), this.calcLinePoints());\n    },\n\n    /*\n     * Calculate object dimensions from its properties\n     * @private\n     */\n    _getNonTransformedDimensions: function() {\n      var dim = this.callSuper('_getNonTransformedDimensions');\n      if (this.strokeLineCap === 'butt') {\n        if (this.width === 0) {\n          dim.y -= this.strokeWidth;\n        }\n        if (this.height === 0) {\n          dim.x -= this.strokeWidth;\n        }\n      }\n      return dim;\n    },\n\n    /**\n     * Recalculates line points given width and height\n     * @private\n     */\n    calcLinePoints: function() {\n      var xMult = this.x1 <= this.x2 ? -1 : 1,\n          yMult = this.y1 <= this.y2 ? -1 : 1,\n          x1 = (xMult * this.width * 0.5),\n          y1 = (yMult * this.height * 0.5),\n          x2 = (xMult * this.width * -0.5),\n          y2 = (yMult * this.height * -0.5);\n\n      return {\n        x1: x1,\n        x2: x2,\n        y1: y1,\n        y2: y2\n      };\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var p = this.calcLinePoints();\n      return [\n        '<line ', 'COMMON_PARTS',\n        'x1=\"', p.x1,\n        '\" y1=\"', p.y1,\n        '\" x2=\"', p.x2,\n        '\" y2=\"', p.y2,\n        '\" />\\n'\n      ];\n    },\n    /* _TO_SVG_END_ */\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by {@link fabric.Line.fromElement})\n   * @static\n   * @memberOf fabric.Line\n   * @see http://www.w3.org/TR/SVG/shapes.html#LineElement\n   */\n  fabric.Line.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x1 y1 x2 y2'.split(' '));\n\n  /**\n   * Returns fabric.Line instance from an SVG element\n   * @static\n   * @memberOf fabric.Line\n   * @param {SVGElement} element Element to parse\n   * @param {Object} [options] Options object\n   * @param {Function} [callback] callback function invoked after parsing\n   */\n  fabric.Line.fromElement = function(element, callback, options) {\n    options = options || { };\n    var parsedAttributes = fabric.parseAttributes(element, fabric.Line.ATTRIBUTE_NAMES),\n        points = [\n          parsedAttributes.x1 || 0,\n          parsedAttributes.y1 || 0,\n          parsedAttributes.x2 || 0,\n          parsedAttributes.y2 || 0\n        ];\n    callback(new fabric.Line(points, extend(parsedAttributes, options)));\n  };\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns fabric.Line instance from an object representation\n   * @static\n   * @memberOf fabric.Line\n   * @param {Object} object Object to create an instance from\n   * @param {function} [callback] invoked with new instance as first argument\n   */\n  fabric.Line.fromObject = function(object, callback) {\n    function _callback(instance) {\n      delete instance.points;\n      callback && callback(instance);\n    };\n    var options = clone(object, true);\n    options.points = [object.x1, object.y1, object.x2, object.y2];\n    fabric.Object._fromObject('Line', options, _callback, 'points');\n  };\n\n  /**\n   * Produces a function that calculates distance from canvas edge to Line origin.\n   */\n  function makeEdgeToOriginGetter(propertyNames, originValues) {\n    var origin = propertyNames.origin,\n        axis1 = propertyNames.axis1,\n        axis2 = propertyNames.axis2,\n        dimension = propertyNames.dimension,\n        nearest = originValues.nearest,\n        center = originValues.center,\n        farthest = originValues.farthest;\n\n    return function() {\n      switch (this.get(origin)) {\n        case nearest:\n          return Math.min(this.get(axis1), this.get(axis2));\n        case center:\n          return Math.min(this.get(axis1), this.get(axis2)) + (0.5 * this.get(dimension));\n        case farthest:\n          return Math.max(this.get(axis1), this.get(axis2));\n      }\n    };\n\n  }\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      pi = Math.PI;\n\n  if (fabric.Circle) {\n    fabric.warn('fabric.Circle is already defined.');\n    return;\n  }\n\n  /**\n   * Circle class\n   * @class fabric.Circle\n   * @extends fabric.Object\n   * @see {@link fabric.Circle#initialize} for constructor definition\n   */\n  fabric.Circle = fabric.util.createClass(fabric.Object, /** @lends fabric.Circle.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'circle',\n\n    /**\n     * Radius of this circle\n     * @type Number\n     * @default\n     */\n    radius: 0,\n\n    /**\n     * Start angle of the circle, moving clockwise\n     * deprectated type, this should be in degree, this was an oversight.\n     * probably will change to degrees in next major version\n     * @type Number\n     * @default 0\n     */\n    startAngle: 0,\n\n    /**\n     * End angle of the circle\n     * deprectated type, this should be in degree, this was an oversight.\n     * probably will change to degrees in next major version\n     * @type Number\n     * @default 2Pi\n     */\n    endAngle: pi * 2,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('radius', 'startAngle', 'endAngle'),\n\n    /**\n     * @private\n     * @param {String} key\n     * @param {*} value\n     * @return {fabric.Circle} thisArg\n     */\n    _set: function(key, value) {\n      this.callSuper('_set', key, value);\n\n      if (key === 'radius') {\n        this.setRadius(value);\n      }\n\n      return this;\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return this.callSuper('toObject', ['radius', 'startAngle', 'endAngle'].concat(propertiesToInclude));\n    },\n\n    /* _TO_SVG_START_ */\n\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var svgString, x = 0, y = 0,\n          angle = (this.endAngle - this.startAngle) % ( 2 * pi);\n\n      if (angle === 0) {\n        svgString = [\n          '<circle ', 'COMMON_PARTS',\n          'cx=\"' + x + '\" cy=\"' + y + '\" ',\n          'r=\"', this.radius,\n          '\" />\\n'\n        ];\n      }\n      else {\n        var startX = fabric.util.cos(this.startAngle) * this.radius,\n            startY = fabric.util.sin(this.startAngle) * this.radius,\n            endX = fabric.util.cos(this.endAngle) * this.radius,\n            endY = fabric.util.sin(this.endAngle) * this.radius,\n            largeFlag = angle > pi ? '1' : '0';\n        svgString = [\n          '<path d=\"M ' + startX + ' ' + startY,\n          ' A ' + this.radius + ' ' + this.radius,\n          ' 0 ', +largeFlag + ' 1', ' ' + endX + ' ' + endY,\n          '\" ', 'COMMON_PARTS', ' />\\n'\n        ];\n      }\n      return svgString;\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx context to render on\n     */\n    _render: function(ctx) {\n      ctx.beginPath();\n      ctx.arc(\n        0,\n        0,\n        this.radius,\n        this.startAngle,\n        this.endAngle, false);\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * Returns horizontal radius of an object (according to how an object is scaled)\n     * @return {Number}\n     */\n    getRadiusX: function() {\n      return this.get('radius') * this.get('scaleX');\n    },\n\n    /**\n     * Returns vertical radius of an object (according to how an object is scaled)\n     * @return {Number}\n     */\n    getRadiusY: function() {\n      return this.get('radius') * this.get('scaleY');\n    },\n\n    /**\n     * Sets radius of an object (and updates width accordingly)\n     * @return {fabric.Circle} thisArg\n     */\n    setRadius: function(value) {\n      this.radius = value;\n      return this.set('width', value * 2).set('height', value * 2);\n    },\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by {@link fabric.Circle.fromElement})\n   * @static\n   * @memberOf fabric.Circle\n   * @see: http://www.w3.org/TR/SVG/shapes.html#CircleElement\n   */\n  fabric.Circle.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy r'.split(' '));\n\n  /**\n   * Returns {@link fabric.Circle} instance from an SVG element\n   * @static\n   * @memberOf fabric.Circle\n   * @param {SVGElement} element Element to parse\n   * @param {Function} [callback] Options callback invoked after parsing is finished\n   * @param {Object} [options] Options object\n   * @throws {Error} If value of `r` attribute is missing or invalid\n   */\n  fabric.Circle.fromElement = function(element, callback) {\n    var parsedAttributes = fabric.parseAttributes(element, fabric.Circle.ATTRIBUTE_NAMES);\n\n    if (!isValidRadius(parsedAttributes)) {\n      throw new Error('value of `r` attribute is required and can not be negative');\n    }\n\n    parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.radius;\n    parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.radius;\n    callback(new fabric.Circle(parsedAttributes));\n  };\n\n  /**\n   * @private\n   */\n  function isValidRadius(attributes) {\n    return (('radius' in attributes) && (attributes.radius >= 0));\n  }\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns {@link fabric.Circle} instance from an object representation\n   * @static\n   * @memberOf fabric.Circle\n   * @param {Object} object Object to create an instance from\n   * @param {function} [callback] invoked with new instance as first argument\n   * @return {Object} Instance of fabric.Circle\n   */\n  fabric.Circle.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Circle', object, callback);\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { });\n\n  if (fabric.Triangle) {\n    fabric.warn('fabric.Triangle is already defined');\n    return;\n  }\n\n  /**\n   * Triangle class\n   * @class fabric.Triangle\n   * @extends fabric.Object\n   * @return {fabric.Triangle} thisArg\n   * @see {@link fabric.Triangle#initialize} for constructor definition\n   */\n  fabric.Triangle = fabric.util.createClass(fabric.Object, /** @lends fabric.Triangle.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'triangle',\n\n    /**\n     * Width is set to 100 to compensate the old initialize code that was setting it to 100\n     * @type Number\n     * @default\n     */\n    width: 100,\n\n    /**\n     * Height is set to 100 to compensate the old initialize code that was setting it to 100\n     * @type Number\n     * @default\n     */\n    height: 100,\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(ctx) {\n      var widthBy2 = this.width / 2,\n          heightBy2 = this.height / 2;\n\n      ctx.beginPath();\n      ctx.moveTo(-widthBy2, heightBy2);\n      ctx.lineTo(0, -heightBy2);\n      ctx.lineTo(widthBy2, heightBy2);\n      ctx.closePath();\n\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderDashedStroke: function(ctx) {\n      var widthBy2 = this.width / 2,\n          heightBy2 = this.height / 2;\n\n      ctx.beginPath();\n      fabric.util.drawDashedLine(ctx, -widthBy2, heightBy2, 0, -heightBy2, this.strokeDashArray);\n      fabric.util.drawDashedLine(ctx, 0, -heightBy2, widthBy2, heightBy2, this.strokeDashArray);\n      fabric.util.drawDashedLine(ctx, widthBy2, heightBy2, -widthBy2, heightBy2, this.strokeDashArray);\n      ctx.closePath();\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var widthBy2 = this.width / 2,\n          heightBy2 = this.height / 2,\n          points = [\n            -widthBy2 + ' ' + heightBy2,\n            '0 ' + -heightBy2,\n            widthBy2 + ' ' + heightBy2\n          ].join(',');\n      return [\n        '<polygon ', 'COMMON_PARTS',\n        'points=\"', points,\n        '\" />'\n      ];\n    },\n    /* _TO_SVG_END_ */\n  });\n\n  /**\n   * Returns {@link fabric.Triangle} instance from an object representation\n   * @static\n   * @memberOf fabric.Triangle\n   * @param {Object} object Object to create an instance from\n   * @param {function} [callback] invoked with new instance as first argument\n   */\n  fabric.Triangle.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Triangle', object, callback);\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      piBy2   = Math.PI * 2;\n\n  if (fabric.Ellipse) {\n    fabric.warn('fabric.Ellipse is already defined.');\n    return;\n  }\n\n  /**\n   * Ellipse class\n   * @class fabric.Ellipse\n   * @extends fabric.Object\n   * @return {fabric.Ellipse} thisArg\n   * @see {@link fabric.Ellipse#initialize} for constructor definition\n   */\n  fabric.Ellipse = fabric.util.createClass(fabric.Object, /** @lends fabric.Ellipse.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'ellipse',\n\n    /**\n     * Horizontal radius\n     * @type Number\n     * @default\n     */\n    rx:   0,\n\n    /**\n     * Vertical radius\n     * @type Number\n     * @default\n     */\n    ry:   0,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n    /**\n     * Constructor\n     * @param {Object} [options] Options object\n     * @return {fabric.Ellipse} thisArg\n     */\n    initialize: function(options) {\n      this.callSuper('initialize', options);\n      this.set('rx', options && options.rx || 0);\n      this.set('ry', options && options.ry || 0);\n    },\n\n    /**\n     * @private\n     * @param {String} key\n     * @param {*} value\n     * @return {fabric.Ellipse} thisArg\n     */\n    _set: function(key, value) {\n      this.callSuper('_set', key, value);\n      switch (key) {\n\n        case 'rx':\n          this.rx = value;\n          this.set('width', value * 2);\n          break;\n\n        case 'ry':\n          this.ry = value;\n          this.set('height', value * 2);\n          break;\n\n      }\n      return this;\n    },\n\n    /**\n     * Returns horizontal radius of an object (according to how an object is scaled)\n     * @return {Number}\n     */\n    getRx: function() {\n      return this.get('rx') * this.get('scaleX');\n    },\n\n    /**\n     * Returns Vertical radius of an object (according to how an object is scaled)\n     * @return {Number}\n     */\n    getRy: function() {\n      return this.get('ry') * this.get('scaleY');\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      return [\n        '<ellipse ', 'COMMON_PARTS',\n        'cx=\"0\" cy=\"0\" ',\n        'rx=\"', this.rx,\n        '\" ry=\"', this.ry,\n        '\" />\\n'\n      ];\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx context to render on\n     */\n    _render: function(ctx) {\n      ctx.beginPath();\n      ctx.save();\n      ctx.transform(1, 0, 0, this.ry / this.rx, 0, 0);\n      ctx.arc(\n        0,\n        0,\n        this.rx,\n        0,\n        piBy2,\n        false);\n      ctx.restore();\n      this._renderPaintInOrder(ctx);\n    },\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by {@link fabric.Ellipse.fromElement})\n   * @static\n   * @memberOf fabric.Ellipse\n   * @see http://www.w3.org/TR/SVG/shapes.html#EllipseElement\n   */\n  fabric.Ellipse.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy rx ry'.split(' '));\n\n  /**\n   * Returns {@link fabric.Ellipse} instance from an SVG element\n   * @static\n   * @memberOf fabric.Ellipse\n   * @param {SVGElement} element Element to parse\n   * @param {Function} [callback] Options callback invoked after parsing is finished\n   * @return {fabric.Ellipse}\n   */\n  fabric.Ellipse.fromElement = function(element, callback) {\n\n    var parsedAttributes = fabric.parseAttributes(element, fabric.Ellipse.ATTRIBUTE_NAMES);\n\n    parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.rx;\n    parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.ry;\n    callback(new fabric.Ellipse(parsedAttributes));\n  };\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns {@link fabric.Ellipse} instance from an object representation\n   * @static\n   * @memberOf fabric.Ellipse\n   * @param {Object} object Object to create an instance from\n   * @param {function} [callback] invoked with new instance as first argument\n   * @return {fabric.Ellipse}\n   */\n  fabric.Ellipse.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Ellipse', object, callback);\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      extend = fabric.util.object.extend;\n\n  if (fabric.Rect) {\n    fabric.warn('fabric.Rect is already defined');\n    return;\n  }\n\n  /**\n   * Rectangle class\n   * @class fabric.Rect\n   * @extends fabric.Object\n   * @return {fabric.Rect} thisArg\n   * @see {@link fabric.Rect#initialize} for constructor definition\n   */\n  fabric.Rect = fabric.util.createClass(fabric.Object, /** @lends fabric.Rect.prototype */ {\n\n    /**\n     * List of properties to consider when checking if state of an object is changed ({@link fabric.Object#hasStateChanged})\n     * as well as for history (undo/redo) purposes\n     * @type Array\n     */\n    stateProperties: fabric.Object.prototype.stateProperties.concat('rx', 'ry'),\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'rect',\n\n    /**\n     * Horizontal border radius\n     * @type Number\n     * @default\n     */\n    rx:   0,\n\n    /**\n     * Vertical border radius\n     * @type Number\n     * @default\n     */\n    ry:   0,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n    /**\n     * Constructor\n     * @param {Object} [options] Options object\n     * @return {Object} thisArg\n     */\n    initialize: function(options) {\n      this.callSuper('initialize', options);\n      this._initRxRy();\n    },\n\n    /**\n     * Initializes rx/ry attributes\n     * @private\n     */\n    _initRxRy: function() {\n      if (this.rx && !this.ry) {\n        this.ry = this.rx;\n      }\n      else if (this.ry && !this.rx) {\n        this.rx = this.ry;\n      }\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(ctx) {\n\n      // 1x1 case (used in spray brush) optimization was removed because\n      // with caching and higher zoom level this makes more damage than help\n\n      var rx = this.rx ? Math.min(this.rx, this.width / 2) : 0,\n          ry = this.ry ? Math.min(this.ry, this.height / 2) : 0,\n          w = this.width,\n          h = this.height,\n          x = -this.width / 2,\n          y = -this.height / 2,\n          isRounded = rx !== 0 || ry !== 0,\n          /* \"magic number\" for bezier approximations of arcs (http://itc.ktu.lt/itc354/Riskus354.pdf) */\n          k = 1 - 0.5522847498;\n      ctx.beginPath();\n\n      ctx.moveTo(x + rx, y);\n\n      ctx.lineTo(x + w - rx, y);\n      isRounded && ctx.bezierCurveTo(x + w - k * rx, y, x + w, y + k * ry, x + w, y + ry);\n\n      ctx.lineTo(x + w, y + h - ry);\n      isRounded && ctx.bezierCurveTo(x + w, y + h - k * ry, x + w - k * rx, y + h, x + w - rx, y + h);\n\n      ctx.lineTo(x + rx, y + h);\n      isRounded && ctx.bezierCurveTo(x + k * rx, y + h, x, y + h - k * ry, x, y + h - ry);\n\n      ctx.lineTo(x, y + ry);\n      isRounded && ctx.bezierCurveTo(x, y + k * ry, x + k * rx, y, x + rx, y);\n\n      ctx.closePath();\n\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderDashedStroke: function(ctx) {\n      var x = -this.width / 2,\n          y = -this.height / 2,\n          w = this.width,\n          h = this.height;\n\n      ctx.beginPath();\n      fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);\n      fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);\n      fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);\n      fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);\n      ctx.closePath();\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var x = -this.width / 2, y = -this.height / 2;\n      return [\n        '<rect ', 'COMMON_PARTS',\n        'x=\"', x, '\" y=\"', y,\n        '\" rx=\"', this.rx, '\" ry=\"', this.ry,\n        '\" width=\"', this.width, '\" height=\"', this.height,\n        '\" />\\n'\n      ];\n    },\n    /* _TO_SVG_END_ */\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by `fabric.Rect.fromElement`)\n   * @static\n   * @memberOf fabric.Rect\n   * @see: http://www.w3.org/TR/SVG/shapes.html#RectElement\n   */\n  fabric.Rect.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y rx ry width height'.split(' '));\n\n  /**\n   * Returns {@link fabric.Rect} instance from an SVG element\n   * @static\n   * @memberOf fabric.Rect\n   * @param {SVGElement} element Element to parse\n   * @param {Function} callback callback function invoked after parsing\n   * @param {Object} [options] Options object\n   */\n  fabric.Rect.fromElement = function(element, callback, options) {\n    if (!element) {\n      return callback(null);\n    }\n    options = options || { };\n\n    var parsedAttributes = fabric.parseAttributes(element, fabric.Rect.ATTRIBUTE_NAMES);\n\n    parsedAttributes.left = parsedAttributes.left || 0;\n    parsedAttributes.top  = parsedAttributes.top  || 0;\n    parsedAttributes.height  = parsedAttributes.height || 0;\n    parsedAttributes.width  = parsedAttributes.width || 0;\n    var rect = new fabric.Rect(extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes));\n    rect.visible = rect.visible && rect.width > 0 && rect.height > 0;\n    callback(rect);\n  };\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns {@link fabric.Rect} instance from an object representation\n   * @static\n   * @memberOf fabric.Rect\n   * @param {Object} object Object to create an instance from\n   * @param {Function} [callback] Callback to invoke when an fabric.Rect instance is created\n   */\n  fabric.Rect.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Rect', object, callback);\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      extend = fabric.util.object.extend,\n      min = fabric.util.array.min,\n      max = fabric.util.array.max,\n      toFixed = fabric.util.toFixed;\n\n  if (fabric.Polyline) {\n    fabric.warn('fabric.Polyline is already defined');\n    return;\n  }\n\n  /**\n   * Polyline class\n   * @class fabric.Polyline\n   * @extends fabric.Object\n   * @see {@link fabric.Polyline#initialize} for constructor definition\n   */\n  fabric.Polyline = fabric.util.createClass(fabric.Object, /** @lends fabric.Polyline.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'polyline',\n\n    /**\n     * Points array\n     * @type Array\n     * @default\n     */\n    points: null,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('points'),\n\n    /**\n     * Constructor\n     * @param {Array} points Array of points (where each point is an object with x and y)\n     * @param {Object} [options] Options object\n     * @return {fabric.Polyline} thisArg\n     * @example\n     * var poly = new fabric.Polyline([\n     *     { x: 10, y: 10 },\n     *     { x: 50, y: 30 },\n     *     { x: 40, y: 70 },\n     *     { x: 60, y: 50 },\n     *     { x: 100, y: 150 },\n     *     { x: 40, y: 100 }\n     *   ], {\n     *   stroke: 'red',\n     *   left: 100,\n     *   top: 100\n     * });\n     */\n    initialize: function(points, options) {\n      options = options || {};\n      this.points = points || [];\n      this.callSuper('initialize', options);\n      this._setPositionDimensions(options);\n    },\n\n    _setPositionDimensions: function(options) {\n      var calcDim = this._calcDimensions(options), correctLeftTop;\n      this.width = calcDim.width;\n      this.height = calcDim.height;\n      if (!options.fromSVG) {\n        correctLeftTop = this.translateToGivenOrigin(\n          { x: calcDim.left - this.strokeWidth / 2, y: calcDim.top - this.strokeWidth / 2 },\n          'left',\n          'top',\n          this.originX,\n          this.originY\n        );\n      }\n      if (typeof options.left === 'undefined') {\n        this.left = options.fromSVG ? calcDim.left : correctLeftTop.x;\n      }\n      if (typeof options.top === 'undefined') {\n        this.top = options.fromSVG ? calcDim.top : correctLeftTop.y;\n      }\n      this.pathOffset = {\n        x: calcDim.left + this.width / 2,\n        y: calcDim.top + this.height / 2\n      };\n    },\n\n    /**\n     * Calculate the polygon min and max point from points array,\n     * returning an object with left, top, widht, height to measure the\n     * polygon size\n     * @return {Object} object.left X coordinate of the polygon leftmost point\n     * @return {Object} object.top Y coordinate of the polygon topmost point\n     * @return {Object} object.width distance between X coordinates of the polygon leftmost and rightmost point\n     * @return {Object} object.height distance between Y coordinates of the polygon topmost and bottommost point\n     * @private\n     */\n    _calcDimensions: function() {\n\n      var points = this.points,\n          minX = min(points, 'x') || 0,\n          minY = min(points, 'y') || 0,\n          maxX = max(points, 'x') || 0,\n          maxY = max(points, 'y') || 0,\n          width = (maxX - minX),\n          height = (maxY - minY);\n\n      return {\n        left: minX,\n        top: minY,\n        width: width,\n        height: height\n      };\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} Object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return extend(this.callSuper('toObject', propertiesToInclude), {\n        points: this.points.concat()\n      });\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var points = [], diffX = this.pathOffset.x, diffY = this.pathOffset.y,\n          NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n      for (var i = 0, len = this.points.length; i < len; i++) {\n        points.push(\n          toFixed(this.points[i].x - diffX, NUM_FRACTION_DIGITS), ',',\n          toFixed(this.points[i].y - diffY, NUM_FRACTION_DIGITS), ' '\n        );\n      }\n      return [\n        '<' + this.type + ' ', 'COMMON_PARTS',\n        'points=\"', points.join(''),\n        '\" />\\n'\n      ];\n    },\n    /* _TO_SVG_END_ */\n\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    commonRender: function(ctx) {\n      var point, len = this.points.length,\n          x = this.pathOffset.x,\n          y = this.pathOffset.y;\n\n      if (!len || isNaN(this.points[len - 1].y)) {\n        // do not draw if no points or odd points\n        // NaN comes from parseFloat of a empty string in parser\n        return false;\n      }\n      ctx.beginPath();\n      ctx.moveTo(this.points[0].x - x, this.points[0].y - y);\n      for (var i = 0; i < len; i++) {\n        point = this.points[i];\n        ctx.lineTo(point.x - x, point.y - y);\n      }\n      return true;\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(ctx) {\n      if (!this.commonRender(ctx)) {\n        return;\n      }\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderDashedStroke: function(ctx) {\n      var p1, p2;\n\n      ctx.beginPath();\n      for (var i = 0, len = this.points.length; i < len; i++) {\n        p1 = this.points[i];\n        p2 = this.points[i + 1] || p1;\n        fabric.util.drawDashedLine(ctx, p1.x, p1.y, p2.x, p2.y, this.strokeDashArray);\n      }\n    },\n\n    /**\n     * Returns complexity of an instance\n     * @return {Number} complexity of this instance\n     */\n    complexity: function() {\n      return this.get('points').length;\n    }\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by {@link fabric.Polyline.fromElement})\n   * @static\n   * @memberOf fabric.Polyline\n   * @see: http://www.w3.org/TR/SVG/shapes.html#PolylineElement\n   */\n  fabric.Polyline.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n\n  /**\n   * Returns fabric.Polyline instance from an SVG element\n   * @static\n   * @memberOf fabric.Polyline\n   * @param {SVGElement} element Element to parser\n   * @param {Function} callback callback function invoked after parsing\n   * @param {Object} [options] Options object\n   */\n  fabric.Polyline.fromElementGenerator = function(_class) {\n    return function(element, callback, options) {\n      if (!element) {\n        return callback(null);\n      }\n      options || (options = { });\n\n      var points = fabric.parsePointsAttribute(element.getAttribute('points')),\n          parsedAttributes = fabric.parseAttributes(element, fabric[_class].ATTRIBUTE_NAMES);\n      parsedAttributes.fromSVG = true;\n      callback(new fabric[_class](points, extend(parsedAttributes, options)));\n    };\n  };\n\n  fabric.Polyline.fromElement = fabric.Polyline.fromElementGenerator('Polyline');\n\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns fabric.Polyline instance from an object representation\n   * @static\n   * @memberOf fabric.Polyline\n   * @param {Object} object Object to create an instance from\n   * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n   */\n  fabric.Polyline.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Polyline', object, callback, 'points');\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { });\n\n  if (fabric.Polygon) {\n    fabric.warn('fabric.Polygon is already defined');\n    return;\n  }\n\n  /**\n   * Polygon class\n   * @class fabric.Polygon\n   * @extends fabric.Polyline\n   * @see {@link fabric.Polygon#initialize} for constructor definition\n   */\n  fabric.Polygon = fabric.util.createClass(fabric.Polyline, /** @lends fabric.Polygon.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'polygon',\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _render: function(ctx) {\n      if (!this.commonRender(ctx)) {\n        return;\n      }\n      ctx.closePath();\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Context to render on\n     */\n    _renderDashedStroke: function(ctx) {\n      this.callSuper('_renderDashedStroke', ctx);\n      ctx.closePath();\n    },\n  });\n\n  /* _FROM_SVG_START_ */\n  /**\n   * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)\n   * @static\n   * @memberOf fabric.Polygon\n   * @see: http://www.w3.org/TR/SVG/shapes.html#PolygonElement\n   */\n  fabric.Polygon.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n\n  /**\n   * Returns {@link fabric.Polygon} instance from an SVG element\n   * @static\n   * @memberOf fabric.Polygon\n   * @param {SVGElement} element Element to parse\n   * @param {Function} callback callback function invoked after parsing\n   * @param {Object} [options] Options object\n   */\n  fabric.Polygon.fromElement = fabric.Polyline.fromElementGenerator('Polygon');\n  /* _FROM_SVG_END_ */\n\n  /**\n   * Returns fabric.Polygon instance from an object representation\n   * @static\n   * @memberOf fabric.Polygon\n   * @param {Object} object Object to create an instance from\n   * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n   */\n  fabric.Polygon.fromObject = function(object, callback) {\n    return fabric.Object._fromObject('Polygon', object, callback, 'points');\n  };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n  'use strict';\n\n  var fabric = global.fabric || (global.fabric = { }),\n      min = fabric.util.array.min,\n      max = fabric.util.array.max,\n      extend = fabric.util.object.extend,\n      _toString = Object.prototype.toString,\n      drawArc = fabric.util.drawArc,\n      toFixed = fabric.util.toFixed,\n      commandLengths = {\n        m: 2,\n        l: 2,\n        h: 1,\n        v: 1,\n        c: 6,\n        s: 4,\n        q: 4,\n        t: 2,\n        a: 7\n      },\n      repeatedCommands = {\n        m: 'l',\n        M: 'L'\n      };\n\n  if (fabric.Path) {\n    fabric.warn('fabric.Path is already defined');\n    return;\n  }\n\n  /**\n   * Path class\n   * @class fabric.Path\n   * @extends fabric.Object\n   * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#path_and_pathgroup}\n   * @see {@link fabric.Path#initialize} for constructor definition\n   */\n  fabric.Path = fabric.util.createClass(fabric.Object, /** @lends fabric.Path.prototype */ {\n\n    /**\n     * Type of an object\n     * @type String\n     * @default\n     */\n    type: 'path',\n\n    /**\n     * Array of path points\n     * @type Array\n     * @default\n     */\n    path: null,\n\n    cacheProperties: fabric.Object.prototype.cacheProperties.concat('path', 'fillRule'),\n\n    stateProperties: fabric.Object.prototype.stateProperties.concat('path'),\n\n    /**\n     * Constructor\n     * @param {Array|String} path Path data (sequence of coordinates and corresponding \"command\" tokens)\n     * @param {Object} [options] Options object\n     * @return {fabric.Path} thisArg\n     */\n    initialize: function(path, options) {\n      options = options || { };\n      this.callSuper('initialize', options);\n\n      if (!path) {\n        path = [];\n      }\n\n      var fromArray = _toString.call(path) === '[object Array]';\n\n      this.path = fromArray\n        ? path\n        // one of commands (m,M,l,L,q,Q,c,C,etc.) followed by non-command characters (i.e. command values)\n        : path.match && path.match(/[mzlhvcsqta][^mzlhvcsqta]*/gi);\n\n      if (!this.path) {\n        return;\n      }\n\n      if (!fromArray) {\n        this.path = this._parsePath();\n      }\n\n      fabric.Polyline.prototype._setPositionDimensions.call(this, options);\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx context to render path on\n     */\n    _renderPathCommands: function(ctx) {\n      var current, // current instruction\n          previous = null,\n          subpathStartX = 0,\n          subpathStartY = 0,\n          x = 0, // current x\n          y = 0, // current y\n          controlX = 0, // current control point x\n          controlY = 0, // current control point y\n          tempX,\n          tempY,\n          l = -this.pathOffset.x,\n          t = -this.pathOffset.y;\n\n      ctx.beginPath();\n\n      for (var i = 0, len = this.path.length; i < len; ++i) {\n\n        current = this.path[i];\n\n        switch (current[0]) { // first letter\n\n          case 'l': // lineto, relative\n            x += current[1];\n            y += current[2];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'L': // lineto, absolute\n            x = current[1];\n            y = current[2];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'h': // horizontal lineto, relative\n            x += current[1];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'H': // horizontal lineto, absolute\n            x = current[1];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'v': // vertical lineto, relative\n            y += current[1];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'V': // verical lineto, absolute\n            y = current[1];\n            ctx.lineTo(x + l, y + t);\n            break;\n\n          case 'm': // moveTo, relative\n            x += current[1];\n            y += current[2];\n            subpathStartX = x;\n            subpathStartY = y;\n            ctx.moveTo(x + l, y + t);\n            break;\n\n          case 'M': // moveTo, absolute\n            x = current[1];\n            y = current[2];\n            subpathStartX = x;\n            subpathStartY = y;\n            ctx.moveTo(x + l, y + t);\n            break;\n\n          case 'c': // bezierCurveTo, relative\n            tempX = x + current[5];\n            tempY = y + current[6];\n            controlX = x + current[3];\n            controlY = y + current[4];\n            ctx.bezierCurveTo(\n              x + current[1] + l, // x1\n              y + current[2] + t, // y1\n              controlX + l, // x2\n              controlY + t, // y2\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n            break;\n\n          case 'C': // bezierCurveTo, absolute\n            x = current[5];\n            y = current[6];\n            controlX = current[3];\n            controlY = current[4];\n            ctx.bezierCurveTo(\n              current[1] + l,\n              current[2] + t,\n              controlX + l,\n              controlY + t,\n              x + l,\n              y + t\n            );\n            break;\n\n          case 's': // shorthand cubic bezierCurveTo, relative\n\n            // transform to absolute x,y\n            tempX = x + current[3];\n            tempY = y + current[4];\n\n            if (previous[0].match(/[CcSs]/) === null) {\n              // If there is no previous command or if the previous command was not a C, c, S, or s,\n              // the control point is coincident with the current point\n              controlX = x;\n              controlY = y;\n            }\n            else {\n              // calculate reflection of previous control points\n              controlX = 2 * x - controlX;\n              controlY = 2 * y - controlY;\n            }\n\n            ctx.bezierCurveTo(\n              controlX + l,\n              controlY + t,\n              x + current[1] + l,\n              y + current[2] + t,\n              tempX + l,\n              tempY + t\n            );\n            // set control point to 2nd one of this command\n            // \"... the first control point is assumed to be\n            // the reflection of the second control point on\n            // the previous command relative to the current point.\"\n            controlX = x + current[1];\n            controlY = y + current[2];\n\n            x = tempX;\n            y = tempY;\n            break;\n\n          case 'S': // shorthand cubic bezierCurveTo, absolute\n            tempX = current[3];\n            tempY = current[4];\n            if (previous[0].match(/[CcSs]/) === null) {\n              // If there is no previous command or if the previous command was not a C, c, S, or s,\n              // the control point is coincident with the current point\n              controlX = x;\n              controlY = y;\n            }\n            else {\n              // calculate reflection of previous control points\n              controlX = 2 * x - controlX;\n              controlY = 2 * y - controlY;\n            }\n            ctx.bezierCurveTo(\n              controlX + l,\n              controlY + t,\n              current[1] + l,\n              current[2] + t,\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n\n            // set control point to 2nd one of this command\n            // \"... the first control point is assumed to be\n            // the reflection of the second control point on\n            // the previous command relative to the current point.\"\n            controlX = current[1];\n            controlY = current[2];\n\n            break;\n\n          case 'q': // quadraticCurveTo, relative\n            // transform to absolute x,y\n            tempX = x + current[3];\n            tempY = y + current[4];\n\n            controlX = x + current[1];\n            controlY = y + current[2];\n\n            ctx.quadraticCurveTo(\n              controlX + l,\n              controlY + t,\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n            break;\n\n          case 'Q': // quadraticCurveTo, absolute\n            tempX = current[3];\n            tempY = current[4];\n\n            ctx.quadraticCurveTo(\n              current[1] + l,\n              current[2] + t,\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n            controlX = current[1];\n            controlY = current[2];\n            break;\n\n          case 't': // shorthand quadraticCurveTo, relative\n\n            // transform to absolute x,y\n            tempX = x + current[1];\n            tempY = y + current[2];\n\n            if (previous[0].match(/[QqTt]/) === null) {\n              // If there is no previous command or if the previous command was not a Q, q, T or t,\n              // assume the control point is coincident with the current point\n              controlX = x;\n              controlY = y;\n            }\n            else {\n              // calculate reflection of previous control point\n              controlX = 2 * x - controlX;\n              controlY = 2 * y - controlY;\n            }\n\n            ctx.quadraticCurveTo(\n              controlX + l,\n              controlY + t,\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n\n            break;\n\n          case 'T':\n            tempX = current[1];\n            tempY = current[2];\n\n            if (previous[0].match(/[QqTt]/) === null) {\n              // If there is no previous command or if the previous command was not a Q, q, T or t,\n              // assume the control point is coincident with the current point\n              controlX = x;\n              controlY = y;\n            }\n            else {\n              // calculate reflection of previous control point\n              controlX = 2 * x - controlX;\n              controlY = 2 * y - controlY;\n            }\n            ctx.quadraticCurveTo(\n              controlX + l,\n              controlY + t,\n              tempX + l,\n              tempY + t\n            );\n            x = tempX;\n            y = tempY;\n            break;\n\n          case 'a':\n            // TODO: optimize this\n            drawArc(ctx, x + l, y + t, [\n              current[1],\n              current[2],\n              current[3],\n              current[4],\n              current[5],\n              current[6] + x + l,\n              current[7] + y + t\n            ]);\n            x += current[6];\n            y += current[7];\n            break;\n\n          case 'A':\n            // TODO: optimize this\n            drawArc(ctx, x + l, y + t, [\n              current[1],\n              current[2],\n              current[3],\n              current[4],\n              current[5],\n              current[6] + l,\n              current[7] + t\n            ]);\n            x = current[6];\n            y = current[7];\n            break;\n\n          case 'z':\n          case 'Z':\n            x = subpathStartX;\n            y = subpathStartY;\n            ctx.closePath();\n            break;\n        }\n        previous = current;\n      }\n    },\n\n    /**\n     * @private\n     * @param {CanvasRenderingContext2D} ctx context to render path on\n     */\n    _render: function(ctx) {\n      this._renderPathCommands(ctx);\n      this._renderPaintInOrder(ctx);\n    },\n\n    /**\n     * Returns string representation of an instance\n     * @return {String} string representation of an instance\n     */\n    toString: function() {\n      return '#<fabric.Path (' + this.complexity() +\n        '): { \"top\": ' + this.top + ', \"left\": ' + this.left + ' }>';\n    },\n\n    /**\n     * Returns object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toObject: function(propertiesToInclude) {\n      return extend(this.callSuper('toObject', propertiesToInclude), {\n        path: this.path.map(function(item) { return item.slice(); }),\n      });\n    },\n\n    /**\n     * Returns dataless object representation of an instance\n     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n     * @return {Object} object representation of an instance\n     */\n    toDatalessObject: function(propertiesToInclude) {\n      var o = this.toObject(['sourcePath'].concat(propertiesToInclude));\n      if (o.sourcePath) {\n        delete o.path;\n      }\n      return o;\n    },\n\n    /* _TO_SVG_START_ */\n    /**\n     * Returns svg representation of an instance\n     * @return {Array} an array of strings with the specific svg representation\n     * of the instance\n     */\n    _toSVG: function() {\n      var path = this.path.map(function(path) {\n        return path.join(' ');\n      }).join(' ');\n      return [\n        '<path ', 'COMMON_PARTS',\n        'd=\"', path,\n        '\" stroke-linecap=\"round\" ',\n        '/>\\n'\n      ];\n    },\n\n    _getOffsetTransform: function() {\n      var digits = fabric.Object.NUM_FRACTION_DIGITS;\n      return ' translate(' + toFixed(-this.pathOffset.x, digits) + ', ' +\n          toFixed(-this.pathOffset.y, digits) + ')';\n    },\n\n    /**\n     * Returns svg clipPath representation of an instance\n     * @param {Function} [reviver] Method for further parsing of svg representation.\n     * @return {String} svg representation of an instance\n     */\n    toClipPathSVG: function(reviver) {\n      var additionalTransform = this._getOffsetTransform();\n      return '\\t' + this._createBaseClipPathSVGMarkup(\n        this._toSVG(), { reviver: reviver, additionalTransform: additionalTransform }\n      );\n    },\n\n    /**\n     * Returns svg representation of an instance\n     * @param {Function} [reviver] Method for further parsing of svg representation.\n     * @return {String} svg representation of an instance\n     */\n    toSVG: function(reviver) {\n      var additionalTransform = this._getOffsetTransform();\n      return this._createBaseSVGMarkup(this._toSVG(), { reviver: reviver, additionalTransform: additionalTransform  });\n    },\n    /* _TO_SVG_END_ */\n\n    /**\n     * Returns number representation of an instance complexity\n     * @return {Number} complexity of this instance\n     */\n    complexity: function() {\n      return this.path.length;\n    },\n\n    /**\n     * @private\n     */\n    _parsePath: function() {\n      var result = [],\n          coords = [],\n          currentPath,\n          parsed,\n          re = /([-+]?((\\d+\\.\\d+)|((\\d+)|(\\.\\d+)))(?:e[-+]?\\d+)?)/ig,\n          match,\n          coordsStr;\n\n      for (var i = 0, coordsParsed, len = this.path.length; i < len; i++) {\n        currentPath = this.path[i];\n\n        coordsStr = currentPath.slice(1).trim();\n        coords.length = 0;\n\n        while ((match = re.exec(coordsStr))) {\n          coords.push(match[0]);\n        }\n\n        coordsParsed = [currentPath.charAt(0)];\n\n        for (var j = 0, jlen = coords.length; j < jlen; j++) {\n          parsed = parseFloat(coords[j]);\n          if (!isNaN(parsed)) {\n            coordsParsed.push(parsed);\n          }\n        }\n\n        var command = coordsParsed[0],\n            commandLength = commandLengths[command.toLowerCase()],\n            repeatedCommand = repeatedCommands[command] || command;\n\n        if (coordsParsed.length - 1 > commandLength) {\n          for (var k = 1, klen = coordsParsed.length; k < klen; k += commandLength) {\n            result.push([command].concat(coordsParsed.slice(k, k + commandLength)));\n            command = repeatedCommand;\n          }\n        }\n        else {\n          result.push(coordsParsed);\n        }\n      }\n\n      return result;\n    },\n\n    /**\n     * @private\n     */\n    _calcDimensions: function() {\n\n      var aX = [],\n          aY = [],\n          current, // current instruction\n          previous = null,\n          subpathStartX = 0,\n          subpathStartY = 0,\n          x = 0, // current x\n          y = 0, // current y\n          controlX = 0, // current control point x\n          controlY = 0, // current control point y\n          tempX,\n          tempY,\n          bounds;\n\n      for (var i = 0, len = this.path.length; i < len; ++i) {\n\n        current = this.path[i];\n\n        switch (current[0]) { // first letter\n\n          case 'l': // lineto, relative\n            x += current[1];\n            y += current[2];\n            bounds = [];\n            break;\n\n          case 'L': // lineto, absolute\n            x = current[1];\n            y = current[2];\n            bounds = [];\n            break;\n\n          case 'h': // horizontal lineto, relative\n            x += current[1];\n            bounds = [];\n            break;\n\n          case 'H': // horizontal lineto, absolute\n            x = current[1];\n            bounds = [];\n            break;\n\n          case 'v': // vertical lineto, relative\n            y += current[1];\n            bounds = [];\n            break;\n\n          case 'V': // verical lineto, absolute\n            y = current[1];\n            bounds = [];\n            break;\n\n          case 'm': // moveTo, relative\n            x += current[1];\n            y += current[2];\n            subpathStartX = x;\n            subpathStartY = y;\n            bounds = [];\n            break;\n\n          case 'M': // moveTo, absolute\n            x = current[1];\n            y = current[2];\n            subpathStartX = x;\n            subpathStartY = y;\n            bounds = [];\n            break;\n\n          case 'c': // bezierCurveTo, relative\n            tempX = x + current[5];\n            tempY = y + current[6];\n            controlX = x + current[3];\n            controlY = y + current[4];\n            bounds = fabric.util.getBoundsOfCurve(x, y,\n              x + current[1], // x1\n              y + current[2], // y1\n              controlX, // x2\n              controlY, // y2\n              tempX,\n              tempY\n            );\n            x = tempX;\n            y = tempY;\n            break;\n\n          case 'C': // bezierCurveTo, absolute\n            controlX = current[3];\n            controlY = current[4];\n            bounds = fabric.util.getBoundsOfCurve(x, y,\n              current[1],\n              current[2],\n              controlX,\n              controlY,\n              current[5],\n              current[6]\n            );\n            x = current[5];\n            y = current[6];\n            break;\n\n          case 's': // shorthand cubic bezierCurveTo, relative\n\n            // transform to absolute x,y\n            tempX = x + current[3];\n            tempY = y + current[4];\n\n            if (previous[0].match(/[CcSs]/) === null) {\n              // If there is no previous command or if the previous command was not a C, c, S, or s,\n              // the control point is coincident with the current point\n              controlX = x;\n              controlY = y;\n            }\n            else {\n              // calculate reflection of previous control points\n              c