Browse Source
Excanvas adds Canvas support to IE 8 and lower, which we no longer support.adaptive-webui-19844
Thomas Piccirello
6 years ago
3 changed files with 0 additions and 880 deletions
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// Copyright 2006 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Known Issues:
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//
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// * Patterns are not implemented.
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// * Radial gradient are not implemented. The VML version of these look very
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// different from the canvas one.
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// * Clipping paths are not implemented.
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// * Coordsize. The width and height attribute have higher priority than the
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// width and height style values which isn't correct.
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// * Painting mode isn't implemented.
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// * Canvas width/height should is using content-box by default. IE in
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// Quirks mode will draw the canvas using border-box. Either change your
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// doctype to HTML5
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// (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
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// or use Box Sizing Behavior from WebFX
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// (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
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// * Non uniform scaling does not correctly scale strokes.
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// * Optimize. There is always room for speed improvements.
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// Only add this code if we do not already have a canvas implementation
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if (!document.createElement('canvas').getContext) { |
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(function() { |
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// alias some functions to make (compiled) code shorter
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var m = Math; |
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var mr = m.round; |
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var ms = m.sin; |
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var mc = m.cos; |
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var abs = m.abs; |
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var sqrt = m.sqrt; |
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// this is used for sub pixel precision
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var Z = 10; |
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var Z2 = Z / 2; |
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/** |
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* This function is assigned to the <canvas> elements as element.getContext(). |
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* @this {HTMLElement} |
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* @return {CanvasRenderingContext2D_} |
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*/ |
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function getContext() { |
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return this.context_ || |
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(this.context_ = new CanvasRenderingContext2D_(this)); |
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} |
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var slice = Array.prototype.slice; |
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/** |
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* Binds a function to an object. The returned function will always use the |
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* passed in {@code obj} as {@code this}. |
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* |
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* Example: |
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* |
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* g = bind(f, obj, a, b) |
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* g(c, d) // will do f.call(obj, a, b, c, d)
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* |
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* @param {Function} f The function to bind the object to |
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* @param {Object} obj The object that should act as this when the function |
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* is called |
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* @param {*} var_args Rest arguments that will be used as the initial |
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* arguments when the function is called |
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* @return {Function} A new function that has bound this |
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*/ |
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function bind(f, obj, var_args) { |
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var a = slice.call(arguments, 2); |
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return function() { |
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return f.apply(obj, a.concat(slice.call(arguments))); |
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}; |
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} |
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var G_vmlCanvasManager_ = { |
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init: function(opt_doc) { |
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if (/MSIE/.test(navigator.userAgent) && !window.opera) { |
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var doc = opt_doc || document; |
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// Create a dummy element so that IE will allow canvas elements to be
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// recognized.
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doc.createElement('canvas'); |
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doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); |
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} |
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}, |
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init_: function(doc) { |
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// create xmlns
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if (!doc.namespaces['g_vml_']) { |
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doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml', |
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'#default#VML'); |
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} |
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if (!doc.namespaces['g_o_']) { |
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doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office', |
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'#default#VML'); |
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} |
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// Setup default CSS. Only add one style sheet per document
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if (!doc.styleSheets['ex_canvas_']) { |
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var ss = doc.createStyleSheet(); |
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ss.owningElement.id = 'ex_canvas_'; |
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ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + |
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// default size is 300x150 in Gecko and Opera
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'text-align:left;width:300px;height:150px}' + |
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'g_vml_\\:*{behavior:url(#default#VML)}' + |
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'g_o_\\:*{behavior:url(#default#VML)}'; |
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} |
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// find all canvas elements
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var els = doc.getElementsByTagName('canvas'); |
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for (var i = 0; i < els.length; i++) { |
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this.initElement(els[i]); |
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} |
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}, |
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/** |
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* Public initializes a canvas element so that it can be used as canvas |
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* element from now on. This is called automatically before the page is |
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* loaded but if you are creating elements using createElement you need to |
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* make sure this is called on the element. |
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* @param {HTMLElement} el The canvas element to initialize. |
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* @return {HTMLElement} the element that was created. |
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*/ |
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initElement: function(el) { |
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if (!el.getContext) { |
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el.getContext = getContext; |
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// do not use inline function because that will leak memory
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el.attachEvent('onpropertychange', onPropertyChange); |
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el.attachEvent('onresize', onResize); |
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var attrs = el.attributes; |
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if (attrs.width && attrs.width.specified) { |
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// TODO: use runtimeStyle and coordsize
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// el.getContext().setWidth_(attrs.width.nodeValue);
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el.style.width = attrs.width.nodeValue + 'px'; |
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} else { |
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el.width = el.clientWidth; |
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} |
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if (attrs.height && attrs.height.specified) { |
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// TODO: use runtimeStyle and coordsize
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// el.getContext().setHeight_(attrs.height.nodeValue);
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el.style.height = attrs.height.nodeValue + 'px'; |
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} else { |
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el.height = el.clientHeight; |
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} |
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//el.getContext().setCoordsize_()
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} |
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return el; |
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} |
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}; |
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function onPropertyChange(e) { |
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var el = e.srcElement; |
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switch (e.propertyName) { |
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case 'width': |
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el.style.width = el.attributes.width.nodeValue + 'px'; |
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el.getContext().clearRect(); |
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break; |
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case 'height': |
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el.style.height = el.attributes.height.nodeValue + 'px'; |
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el.getContext().clearRect(); |
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break; |
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} |
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} |
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function onResize(e) { |
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var el = e.srcElement; |
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if (el.firstChild) { |
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el.firstChild.style.width = el.clientWidth + 'px'; |
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el.firstChild.style.height = el.clientHeight + 'px'; |
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} |
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} |
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G_vmlCanvasManager_.init(); |
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// precompute "00" to "FF"
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var dec2hex = []; |
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for (var i = 0; i < 16; i++) { |
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for (var j = 0; j < 16; j++) { |
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dec2hex[i * 16 + j] = i.toString(16) + j.toString(16); |
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} |
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} |
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function createMatrixIdentity() { |
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return [ |
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[1, 0, 0], |
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[0, 1, 0], |
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[0, 0, 1] |
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]; |
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} |
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function matrixMultiply(m1, m2) { |
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var result = createMatrixIdentity(); |
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for (var x = 0; x < 3; x++) { |
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for (var y = 0; y < 3; y++) { |
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var sum = 0; |
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for (var z = 0; z < 3; z++) { |
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sum += m1[x][z] * m2[z][y]; |
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} |
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result[x][y] = sum; |
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} |
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} |
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return result; |
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} |
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function copyState(o1, o2) { |
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o2.fillStyle = o1.fillStyle; |
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o2.lineCap = o1.lineCap; |
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o2.lineJoin = o1.lineJoin; |
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o2.lineWidth = o1.lineWidth; |
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o2.miterLimit = o1.miterLimit; |
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o2.shadowBlur = o1.shadowBlur; |
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o2.shadowColor = o1.shadowColor; |
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o2.shadowOffsetX = o1.shadowOffsetX; |
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o2.shadowOffsetY = o1.shadowOffsetY; |
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o2.strokeStyle = o1.strokeStyle; |
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o2.globalAlpha = o1.globalAlpha; |
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o2.arcScaleX_ = o1.arcScaleX_; |
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o2.arcScaleY_ = o1.arcScaleY_; |
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o2.lineScale_ = o1.lineScale_; |
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} |
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function processStyle(styleString) { |
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var str, alpha = 1; |
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styleString = String(styleString); |
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if (styleString.substring(0, 3) == 'rgb') { |
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var start = styleString.indexOf('(', 3); |
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var end = styleString.indexOf(')', start + 1); |
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var guts = styleString.substring(start + 1, end).split(','); |
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str = '#'; |
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for (var i = 0; i < 3; i++) { |
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str += dec2hex[Number(guts[i])]; |
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} |
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if (guts.length == 4 && styleString.substr(3, 1) == 'a') { |
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alpha = guts[3]; |
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} |
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} else { |
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str = styleString; |
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} |
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return {color: str, alpha: alpha}; |
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} |
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function processLineCap(lineCap) { |
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switch (lineCap) { |
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case 'butt': |
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return 'flat'; |
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case 'round': |
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return 'round'; |
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case 'square': |
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default: |
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return 'square'; |
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} |
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} |
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/** |
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* This class implements CanvasRenderingContext2D interface as described by |
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* the WHATWG. |
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* @param {HTMLElement} surfaceElement The element that the 2D context should |
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* be associated with |
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*/ |
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function CanvasRenderingContext2D_(surfaceElement) { |
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this.m_ = createMatrixIdentity(); |
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this.mStack_ = []; |
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this.aStack_ = []; |
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this.currentPath_ = []; |
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// Canvas context properties
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this.strokeStyle = '#000'; |
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this.fillStyle = '#000'; |
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this.lineWidth = 1; |
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this.lineJoin = 'miter'; |
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this.lineCap = 'butt'; |
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this.miterLimit = Z * 1; |
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this.globalAlpha = 1; |
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this.canvas = surfaceElement; |
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var el = surfaceElement.ownerDocument.createElement('div'); |
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el.style.width = surfaceElement.clientWidth + 'px'; |
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el.style.height = surfaceElement.clientHeight + 'px'; |
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el.style.overflow = 'hidden'; |
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el.style.position = 'absolute'; |
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surfaceElement.appendChild(el); |
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this.element_ = el; |
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this.arcScaleX_ = 1; |
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this.arcScaleY_ = 1; |
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this.lineScale_ = 1; |
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} |
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var contextPrototype = CanvasRenderingContext2D_.prototype; |
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contextPrototype.clearRect = function() { |
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this.element_.innerHTML = ''; |
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this.currentPath_ = []; |
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}; |
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contextPrototype.beginPath = function() { |
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// TODO: Branch current matrix so that save/restore has no effect
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// as per safari docs.
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this.currentPath_ = []; |
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}; |
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contextPrototype.moveTo = function(aX, aY) { |
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var p = this.getCoords_(aX, aY); |
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this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); |
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this.currentX_ = p.x; |
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this.currentY_ = p.y; |
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}; |
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contextPrototype.lineTo = function(aX, aY) { |
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var p = this.getCoords_(aX, aY); |
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this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); |
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this.currentX_ = p.x; |
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this.currentY_ = p.y; |
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}; |
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contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, |
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aCP2x, aCP2y, |
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aX, aY) { |
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var p = this.getCoords_(aX, aY); |
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var cp1 = this.getCoords_(aCP1x, aCP1y); |
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var cp2 = this.getCoords_(aCP2x, aCP2y); |
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bezierCurveTo(this, cp1, cp2, p); |
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}; |
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// Helper function that takes the already fixed cordinates.
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function bezierCurveTo(self, cp1, cp2, p) { |
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self.currentPath_.push({ |
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type: 'bezierCurveTo', |
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cp1x: cp1.x, |
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cp1y: cp1.y, |
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cp2x: cp2.x, |
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cp2y: cp2.y, |
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x: p.x, |
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y: p.y |
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}); |
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self.currentX_ = p.x; |
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self.currentY_ = p.y; |
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} |
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contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { |
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// the following is lifted almost directly from
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// http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
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var cp = this.getCoords_(aCPx, aCPy); |
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var p = this.getCoords_(aX, aY); |
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var cp1 = { |
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x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), |
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y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) |
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}; |
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var cp2 = { |
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x: cp1.x + (p.x - this.currentX_) / 3.0, |
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y: cp1.y + (p.y - this.currentY_) / 3.0 |
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}; |
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bezierCurveTo(this, cp1, cp2, p); |
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}; |
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contextPrototype.arc = function(aX, aY, aRadius, |
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aStartAngle, aEndAngle, aClockwise) { |
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aRadius *= Z; |
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var arcType = aClockwise ? 'at' : 'wa'; |
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var xStart = aX + mc(aStartAngle) * aRadius - Z2; |
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var yStart = aY + ms(aStartAngle) * aRadius - Z2; |
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var xEnd = aX + mc(aEndAngle) * aRadius - Z2; |
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var yEnd = aY + ms(aEndAngle) * aRadius - Z2; |
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// IE won't render arches drawn counter clockwise if xStart == xEnd.
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if (xStart == xEnd && !aClockwise) { |
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xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
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// that can be represented in binary
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} |
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var p = this.getCoords_(aX, aY); |
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var pStart = this.getCoords_(xStart, yStart); |
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var pEnd = this.getCoords_(xEnd, yEnd); |
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this.currentPath_.push({type: arcType, |
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x: p.x, |
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y: p.y, |
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radius: aRadius, |
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xStart: pStart.x, |
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yStart: pStart.y, |
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xEnd: pEnd.x, |
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yEnd: pEnd.y}); |
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}; |
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contextPrototype.rect = function(aX, aY, aWidth, aHeight) { |
|
||||||
this.moveTo(aX, aY); |
|
||||||
this.lineTo(aX + aWidth, aY); |
|
||||||
this.lineTo(aX + aWidth, aY + aHeight); |
|
||||||
this.lineTo(aX, aY + aHeight); |
|
||||||
this.closePath(); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { |
|
||||||
// Will destroy any existing path (same as FF behaviour)
|
|
||||||
this.beginPath(); |
|
||||||
this.moveTo(aX, aY); |
|
||||||
this.lineTo(aX + aWidth, aY); |
|
||||||
this.lineTo(aX + aWidth, aY + aHeight); |
|
||||||
this.lineTo(aX, aY + aHeight); |
|
||||||
this.closePath(); |
|
||||||
this.stroke(); |
|
||||||
this.currentPath_ = []; |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { |
|
||||||
// Will destroy any existing path (same as FF behaviour)
|
|
||||||
this.beginPath(); |
|
||||||
this.moveTo(aX, aY); |
|
||||||
this.lineTo(aX + aWidth, aY); |
|
||||||
this.lineTo(aX + aWidth, aY + aHeight); |
|
||||||
this.lineTo(aX, aY + aHeight); |
|
||||||
this.closePath(); |
|
||||||
this.fill(); |
|
||||||
this.currentPath_ = []; |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { |
|
||||||
var gradient = new CanvasGradient_('gradient'); |
|
||||||
gradient.x0_ = aX0; |
|
||||||
gradient.y0_ = aY0; |
|
||||||
gradient.x1_ = aX1; |
|
||||||
gradient.y1_ = aY1; |
|
||||||
return gradient; |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.createRadialGradient = function(aX0, aY0, aR0, |
|
||||||
aX1, aY1, aR1) { |
|
||||||
var gradient = new CanvasGradient_('gradientradial'); |
|
||||||
gradient.x0_ = aX0; |
|
||||||
gradient.y0_ = aY0; |
|
||||||
gradient.r0_ = aR0; |
|
||||||
gradient.x1_ = aX1; |
|
||||||
gradient.y1_ = aY1; |
|
||||||
gradient.r1_ = aR1; |
|
||||||
return gradient; |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.drawImage = function(image, var_args) { |
|
||||||
var dx, dy, dw, dh, sx, sy, sw, sh; |
|
||||||
|
|
||||||
// to find the original width we override the width and height
|
|
||||||
var oldRuntimeWidth = image.runtimeStyle.width; |
|
||||||
var oldRuntimeHeight = image.runtimeStyle.height; |
|
||||||
image.runtimeStyle.width = 'auto'; |
|
||||||
image.runtimeStyle.height = 'auto'; |
|
||||||
|
|
||||||
// get the original size
|
|
||||||
var w = image.width; |
|
||||||
var h = image.height; |
|
||||||
|
|
||||||
// and remove overrides
|
|
||||||
image.runtimeStyle.width = oldRuntimeWidth; |
|
||||||
image.runtimeStyle.height = oldRuntimeHeight; |
|
||||||
|
|
||||||
if (arguments.length == 3) { |
|
||||||
dx = arguments[1]; |
|
||||||
dy = arguments[2]; |
|
||||||
sx = sy = 0; |
|
||||||
sw = dw = w; |
|
||||||
sh = dh = h; |
|
||||||
} else if (arguments.length == 5) { |
|
||||||
dx = arguments[1]; |
|
||||||
dy = arguments[2]; |
|
||||||
dw = arguments[3]; |
|
||||||
dh = arguments[4]; |
|
||||||
sx = sy = 0; |
|
||||||
sw = w; |
|
||||||
sh = h; |
|
||||||
} else if (arguments.length == 9) { |
|
||||||
sx = arguments[1]; |
|
||||||
sy = arguments[2]; |
|
||||||
sw = arguments[3]; |
|
||||||
sh = arguments[4]; |
|
||||||
dx = arguments[5]; |
|
||||||
dy = arguments[6]; |
|
||||||
dw = arguments[7]; |
|
||||||
dh = arguments[8]; |
|
||||||
} else { |
|
||||||
throw Error('Invalid number of arguments'); |
|
||||||
} |
|
||||||
|
|
||||||
var d = this.getCoords_(dx, dy); |
|
||||||
|
|
||||||
var w2 = sw / 2; |
|
||||||
var h2 = sh / 2; |
|
||||||
|
|
||||||
var vmlStr = []; |
|
||||||
|
|
||||||
var W = 10; |
|
||||||
var H = 10; |
|
||||||
|
|
||||||
// For some reason that I've now forgotten, using divs didn't work
|
|
||||||
vmlStr.push(' <g_vml_:group', |
|
||||||
' coordsize="', Z * W, ',', Z * H, '"', |
|
||||||
' coordorigin="0,0"' , |
|
||||||
' style="width:', W, 'px;height:', H, 'px;position:absolute;'); |
|
||||||
|
|
||||||
// If filters are necessary (rotation exists), create them
|
|
||||||
// filters are bog-slow, so only create them if abbsolutely necessary
|
|
||||||
// The following check doesn't account for skews (which don't exist
|
|
||||||
// in the canvas spec (yet) anyway.
|
|
||||||
|
|
||||||
if (this.m_[0][0] != 1 || this.m_[0][1]) { |
|
||||||
var filter = []; |
|
||||||
|
|
||||||
// Note the 12/21 reversal
|
|
||||||
filter.push('M11=', this.m_[0][0], ',', |
|
||||||
'M12=', this.m_[1][0], ',', |
|
||||||
'M21=', this.m_[0][1], ',', |
|
||||||
'M22=', this.m_[1][1], ',', |
|
||||||
'Dx=', mr(d.x / Z), ',', |
|
||||||
'Dy=', mr(d.y / Z), ''); |
|
||||||
|
|
||||||
// Bounding box calculation (need to minimize displayed area so that
|
|
||||||
// filters don't waste time on unused pixels.
|
|
||||||
var max = d; |
|
||||||
var c2 = this.getCoords_(dx + dw, dy); |
|
||||||
var c3 = this.getCoords_(dx, dy + dh); |
|
||||||
var c4 = this.getCoords_(dx + dw, dy + dh); |
|
||||||
|
|
||||||
max.x = m.max(max.x, c2.x, c3.x, c4.x); |
|
||||||
max.y = m.max(max.y, c2.y, c3.y, c4.y); |
|
||||||
|
|
||||||
vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), |
|
||||||
'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', |
|
||||||
filter.join(''), ", sizingmethod='clip');") |
|
||||||
} else { |
|
||||||
vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); |
|
||||||
} |
|
||||||
|
|
||||||
vmlStr.push(' ">' , |
|
||||||
'<g_vml_:image src="', image.src, '"', |
|
||||||
' style="width:', Z * dw, 'px;', |
|
||||||
' height:', Z * dh, 'px;"', |
|
||||||
' cropleft="', sx / w, '"', |
|
||||||
' croptop="', sy / h, '"', |
|
||||||
' cropright="', (w - sx - sw) / w, '"', |
|
||||||
' cropbottom="', (h - sy - sh) / h, '"', |
|
||||||
' />', |
|
||||||
'</g_vml_:group>'); |
|
||||||
|
|
||||||
this.element_.insertAdjacentHTML('BeforeEnd', |
|
||||||
vmlStr.join('')); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.stroke = function(aFill) { |
|
||||||
var lineStr = []; |
|
||||||
var lineOpen = false; |
|
||||||
var a = processStyle(aFill ? this.fillStyle : this.strokeStyle); |
|
||||||
var color = a.color; |
|
||||||
var opacity = a.alpha * this.globalAlpha; |
|
||||||
|
|
||||||
var W = 10; |
|
||||||
var H = 10; |
|
||||||
|
|
||||||
lineStr.push('<g_vml_:shape', |
|
||||||
' filled="', !!aFill, '"', |
|
||||||
' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
|
||||||
' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"', |
|
||||||
' stroked="', !aFill, '"', |
|
||||||
' path="'); |
|
||||||
|
|
||||||
var newSeq = false; |
|
||||||
var min = {x: null, y: null}; |
|
||||||
var max = {x: null, y: null}; |
|
||||||
|
|
||||||
for (var i = 0; i < this.currentPath_.length; i++) { |
|
||||||
var p = this.currentPath_[i]; |
|
||||||
var c; |
|
||||||
|
|
||||||
switch (p.type) { |
|
||||||
case 'moveTo': |
|
||||||
c = p; |
|
||||||
lineStr.push(' m ', mr(p.x), ',', mr(p.y)); |
|
||||||
break; |
|
||||||
case 'lineTo': |
|
||||||
lineStr.push(' l ', mr(p.x), ',', mr(p.y)); |
|
||||||
break; |
|
||||||
case 'close': |
|
||||||
lineStr.push(' x '); |
|
||||||
p = null; |
|
||||||
break; |
|
||||||
case 'bezierCurveTo': |
|
||||||
lineStr.push(' c ', |
|
||||||
mr(p.cp1x), ',', mr(p.cp1y), ',', |
|
||||||
mr(p.cp2x), ',', mr(p.cp2y), ',', |
|
||||||
mr(p.x), ',', mr(p.y)); |
|
||||||
break; |
|
||||||
case 'at': |
|
||||||
case 'wa': |
|
||||||
lineStr.push(' ', p.type, ' ', |
|
||||||
mr(p.x - this.arcScaleX_ * p.radius), ',', |
|
||||||
mr(p.y - this.arcScaleY_ * p.radius), ' ', |
|
||||||
mr(p.x + this.arcScaleX_ * p.radius), ',', |
|
||||||
mr(p.y + this.arcScaleY_ * p.radius), ' ', |
|
||||||
mr(p.xStart), ',', mr(p.yStart), ' ', |
|
||||||
mr(p.xEnd), ',', mr(p.yEnd)); |
|
||||||
break; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
// TODO: Following is broken for curves due to
|
|
||||||
// move to proper paths.
|
|
||||||
|
|
||||||
// Figure out dimensions so we can do gradient fills
|
|
||||||
// properly
|
|
||||||
if (p) { |
|
||||||
if (min.x == null || p.x < min.x) { |
|
||||||
min.x = p.x; |
|
||||||
} |
|
||||||
if (max.x == null || p.x > max.x) { |
|
||||||
max.x = p.x; |
|
||||||
} |
|
||||||
if (min.y == null || p.y < min.y) { |
|
||||||
min.y = p.y; |
|
||||||
} |
|
||||||
if (max.y == null || p.y > max.y) { |
|
||||||
max.y = p.y; |
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
lineStr.push(' ">'); |
|
||||||
|
|
||||||
if (!aFill) { |
|
||||||
var lineWidth = this.lineScale_ * this.lineWidth; |
|
||||||
|
|
||||||
// VML cannot correctly render a line if the width is less than 1px.
|
|
||||||
// In that case, we dilute the color to make the line look thinner.
|
|
||||||
if (lineWidth < 1) { |
|
||||||
opacity *= lineWidth; |
|
||||||
} |
|
||||||
|
|
||||||
lineStr.push( |
|
||||||
'<g_vml_:stroke', |
|
||||||
' opacity="', opacity, '"', |
|
||||||
' joinstyle="', this.lineJoin, '"', |
|
||||||
' miterlimit="', this.miterLimit, '"', |
|
||||||
' endcap="', processLineCap(this.lineCap), '"', |
|
||||||
' weight="', lineWidth, 'px"', |
|
||||||
' color="', color, '" />' |
|
||||||
); |
|
||||||
} else if (typeof this.fillStyle == 'object') { |
|
||||||
var fillStyle = this.fillStyle; |
|
||||||
var angle = 0; |
|
||||||
var focus = {x: 0, y: 0}; |
|
||||||
|
|
||||||
// additional offset
|
|
||||||
var shift = 0; |
|
||||||
// scale factor for offset
|
|
||||||
var expansion = 1; |
|
||||||
|
|
||||||
if (fillStyle.type_ == 'gradient') { |
|
||||||
var x0 = fillStyle.x0_ / this.arcScaleX_; |
|
||||||
var y0 = fillStyle.y0_ / this.arcScaleY_; |
|
||||||
var x1 = fillStyle.x1_ / this.arcScaleX_; |
|
||||||
var y1 = fillStyle.y1_ / this.arcScaleY_; |
|
||||||
var p0 = this.getCoords_(x0, y0); |
|
||||||
var p1 = this.getCoords_(x1, y1); |
|
||||||
var dx = p1.x - p0.x; |
|
||||||
var dy = p1.y - p0.y; |
|
||||||
angle = Math.atan2(dx, dy) * 180 / Math.PI; |
|
||||||
|
|
||||||
// The angle should be a non-negative number.
|
|
||||||
if (angle < 0) { |
|
||||||
angle += 360; |
|
||||||
} |
|
||||||
|
|
||||||
// Very small angles produce an unexpected result because they are
|
|
||||||
// converted to a scientific notation string.
|
|
||||||
if (angle < 1e-6) { |
|
||||||
angle = 0; |
|
||||||
} |
|
||||||
} else { |
|
||||||
var p0 = this.getCoords_(fillStyle.x0_, fillStyle.y0_); |
|
||||||
var width = max.x - min.x; |
|
||||||
var height = max.y - min.y; |
|
||||||
focus = { |
|
||||||
x: (p0.x - min.x) / width, |
|
||||||
y: (p0.y - min.y) / height |
|
||||||
}; |
|
||||||
|
|
||||||
width /= this.arcScaleX_ * Z; |
|
||||||
height /= this.arcScaleY_ * Z; |
|
||||||
var dimension = m.max(width, height); |
|
||||||
shift = 2 * fillStyle.r0_ / dimension; |
|
||||||
expansion = 2 * fillStyle.r1_ / dimension - shift; |
|
||||||
} |
|
||||||
|
|
||||||
// We need to sort the color stops in ascending order by offset,
|
|
||||||
// otherwise IE won't interpret it correctly.
|
|
||||||
var stops = fillStyle.colors_; |
|
||||||
stops.sort(function(cs1, cs2) { |
|
||||||
return cs1.offset - cs2.offset; |
|
||||||
}); |
|
||||||
|
|
||||||
var length = stops.length; |
|
||||||
var color1 = stops[0].color; |
|
||||||
var color2 = stops[length - 1].color; |
|
||||||
var opacity1 = stops[0].alpha * this.globalAlpha; |
|
||||||
var opacity2 = stops[length - 1].alpha * this.globalAlpha; |
|
||||||
|
|
||||||
var colors = []; |
|
||||||
for (var i = 0; i < length; i++) { |
|
||||||
var stop = stops[i]; |
|
||||||
colors.push(stop.offset * expansion + shift + ' ' + stop.color); |
|
||||||
} |
|
||||||
|
|
||||||
// When colors attribute is used, the meanings of opacity and o:opacity2
|
|
||||||
// are reversed.
|
|
||||||
lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', |
|
||||||
' method="none" focus="100%"', |
|
||||||
' color="', color1, '"', |
|
||||||
' color2="', color2, '"', |
|
||||||
' colors="', colors.join(','), '"', |
|
||||||
' opacity="', opacity2, '"', |
|
||||||
' g_o_:opacity2="', opacity1, '"', |
|
||||||
' angle="', angle, '"', |
|
||||||
' focusposition="', focus.x, ',', focus.y, '" />'); |
|
||||||
} else { |
|
||||||
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, |
|
||||||
'" />'); |
|
||||||
} |
|
||||||
|
|
||||||
lineStr.push('</g_vml_:shape>'); |
|
||||||
|
|
||||||
this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.fill = function() { |
|
||||||
this.stroke(true); |
|
||||||
} |
|
||||||
|
|
||||||
contextPrototype.closePath = function() { |
|
||||||
this.currentPath_.push({type: 'close'}); |
|
||||||
}; |
|
||||||
|
|
||||||
/** |
|
||||||
* @private |
|
||||||
*/ |
|
||||||
contextPrototype.getCoords_ = function(aX, aY) { |
|
||||||
var m = this.m_; |
|
||||||
return { |
|
||||||
x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, |
|
||||||
y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 |
|
||||||
} |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.save = function() { |
|
||||||
var o = {}; |
|
||||||
copyState(this, o); |
|
||||||
this.aStack_.push(o); |
|
||||||
this.mStack_.push(this.m_); |
|
||||||
this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.restore = function() { |
|
||||||
copyState(this.aStack_.pop(), this); |
|
||||||
this.m_ = this.mStack_.pop(); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.translate = function(aX, aY) { |
|
||||||
var m1 = [ |
|
||||||
[1, 0, 0], |
|
||||||
[0, 1, 0], |
|
||||||
[aX, aY, 1] |
|
||||||
]; |
|
||||||
|
|
||||||
this.m_ = matrixMultiply(m1, this.m_); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.rotate = function(aRot) { |
|
||||||
var c = mc(aRot); |
|
||||||
var s = ms(aRot); |
|
||||||
|
|
||||||
var m1 = [ |
|
||||||
[c, s, 0], |
|
||||||
[-s, c, 0], |
|
||||||
[0, 0, 1] |
|
||||||
]; |
|
||||||
|
|
||||||
this.m_ = matrixMultiply(m1, this.m_); |
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.scale = function(aX, aY) { |
|
||||||
this.arcScaleX_ *= aX; |
|
||||||
this.arcScaleY_ *= aY; |
|
||||||
var m1 = [ |
|
||||||
[aX, 0, 0], |
|
||||||
[0, aY, 0], |
|
||||||
[0, 0, 1] |
|
||||||
]; |
|
||||||
|
|
||||||
var m = this.m_ = matrixMultiply(m1, this.m_); |
|
||||||
|
|
||||||
// Get the line scale.
|
|
||||||
// Determinant of this.m_ means how much the area is enlarged by the
|
|
||||||
// transformation. So its square root can be used as a scale factor
|
|
||||||
// for width.
|
|
||||||
var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; |
|
||||||
this.lineScale_ = sqrt(abs(det)); |
|
||||||
}; |
|
||||||
|
|
||||||
/******** STUBS ********/ |
|
||||||
contextPrototype.clip = function() { |
|
||||||
// TODO: Implement
|
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.arcTo = function() { |
|
||||||
// TODO: Implement
|
|
||||||
}; |
|
||||||
|
|
||||||
contextPrototype.createPattern = function() { |
|
||||||
return new CanvasPattern_; |
|
||||||
}; |
|
||||||
|
|
||||||
// Gradient / Pattern Stubs
|
|
||||||
function CanvasGradient_(aType) { |
|
||||||
this.type_ = aType; |
|
||||||
this.x0_ = 0; |
|
||||||
this.y0_ = 0; |
|
||||||
this.r0_ = 0; |
|
||||||
this.x1_ = 0; |
|
||||||
this.y1_ = 0; |
|
||||||
this.r1_ = 0; |
|
||||||
this.colors_ = []; |
|
||||||
} |
|
||||||
|
|
||||||
CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { |
|
||||||
aColor = processStyle(aColor); |
|
||||||
this.colors_.push({offset: aOffset, |
|
||||||
color: aColor.color, |
|
||||||
alpha: aColor.alpha}); |
|
||||||
}; |
|
||||||
|
|
||||||
function CanvasPattern_() {} |
|
||||||
|
|
||||||
// set up externs
|
|
||||||
G_vmlCanvasManager = G_vmlCanvasManager_; |
|
||||||
CanvasRenderingContext2D = CanvasRenderingContext2D_; |
|
||||||
CanvasGradient = CanvasGradient_; |
|
||||||
CanvasPattern = CanvasPattern_; |
|
||||||
|
|
||||||
})(); |
|
||||||
|
|
||||||
} // if
|
|
||||||
Loading…
Reference in new issue