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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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|
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|
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// Known Issues: |
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// |
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// * Patterns only support repeat. |
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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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// * Filling very large shapes (above 5000 points) is buggy. |
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// * Optimize. There is always room for speed improvements. |
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|
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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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|
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(function() { |
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|
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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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|
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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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/** |
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* This funtion 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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|
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var slice = Array.prototype.slice; |
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|
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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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|
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function encodeHtmlAttribute(s) { |
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return String(s).replace(/&/g, '&').replace(/"/g, '"'); |
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} |
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|
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function addNamespacesAndStylesheet(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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} |
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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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|
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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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} |
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} |
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|
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// Add namespaces and stylesheet at startup. |
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addNamespacesAndStylesheet(document); |
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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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|
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init_: function(doc) { |
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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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/** |
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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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|
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// Add namespaces and stylesheet to document of the element. |
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addNamespacesAndStylesheet(el.ownerDocument); |
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|
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// Remove fallback content. There is no way to hide text nodes so we |
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// just remove all childNodes. We could hide all elements and remove |
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// text nodes but who really cares about the fallback content. |
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el.innerHTML = ''; |
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|
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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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|
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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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|
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function onPropertyChange(e) { |
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var el = e.srcElement; |
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|
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switch (e.propertyName) { |
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case 'width': |
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el.getContext().clearRect(); |
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el.style.width = el.attributes.width.nodeValue + 'px'; |
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// In IE8 this does not trigger onresize. |
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el.firstChild.style.width = el.clientWidth + 'px'; |
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break; |
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case 'height': |
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el.getContext().clearRect(); |
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el.style.height = el.attributes.height.nodeValue + 'px'; |
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el.firstChild.style.height = el.clientHeight + 'px'; |
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break; |
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} |
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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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|
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G_vmlCanvasManager_.init(); |
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|
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// precompute "00" to "FF" |
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var decToHex = []; |
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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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decToHex[i * 16 + j] = i.toString(16) + j.toString(16); |
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} |
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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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|
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function matrixMultiply(m1, m2) { |
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var result = createMatrixIdentity(); |
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|
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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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|
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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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|
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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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|
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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.font = o1.font; |
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o2.textAlign = o1.textAlign; |
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o2.textBaseline = o1.textBaseline; |
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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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|
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var colorData = { |
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aliceblue: '#F0F8FF', |
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antiquewhite: '#FAEBD7', |
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aquamarine: '#7FFFD4', |
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azure: '#F0FFFF', |
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beige: '#F5F5DC', |
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bisque: '#FFE4C4', |
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black: '#000000', |
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blanchedalmond: '#FFEBCD', |
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blueviolet: '#8A2BE2', |
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brown: '#A52A2A', |
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burlywood: '#DEB887', |
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cadetblue: '#5F9EA0', |
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chartreuse: '#7FFF00', |
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chocolate: '#D2691E', |
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coral: '#FF7F50', |
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cornflowerblue: '#6495ED', |
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cornsilk: '#FFF8DC', |
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crimson: '#DC143C', |
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cyan: '#00FFFF', |
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darkblue: '#00008B', |
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darkcyan: '#008B8B', |
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darkgoldenrod: '#B8860B', |
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darkgray: '#A9A9A9', |
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darkgreen: '#006400', |
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darkgrey: '#A9A9A9', |
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darkkhaki: '#BDB76B', |
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darkmagenta: '#8B008B', |
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darkolivegreen: '#556B2F', |
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darkorange: '#FF8C00', |
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darkorchid: '#9932CC', |
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darkred: '#8B0000', |
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darksalmon: '#E9967A', |
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darkseagreen: '#8FBC8F', |
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darkslateblue: '#483D8B', |
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darkslategray: '#2F4F4F', |
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darkslategrey: '#2F4F4F', |
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darkturquoise: '#00CED1', |
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darkviolet: '#9400D3', |
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deeppink: '#FF1493', |
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deepskyblue: '#00BFFF', |
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dimgray: '#696969', |
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dimgrey: '#696969', |
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dodgerblue: '#1E90FF', |
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firebrick: '#B22222', |
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floralwhite: '#FFFAF0', |
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forestgreen: '#228B22', |
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gainsboro: '#DCDCDC', |
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ghostwhite: '#F8F8FF', |
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gold: '#FFD700', |
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goldenrod: '#DAA520', |
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grey: '#808080', |
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greenyellow: '#ADFF2F', |
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honeydew: '#F0FFF0', |
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hotpink: '#FF69B4', |
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indianred: '#CD5C5C', |
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indigo: '#4B0082', |
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ivory: '#FFFFF0', |
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khaki: '#F0E68C', |
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lavender: '#E6E6FA', |
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lavenderblush: '#FFF0F5', |
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lawngreen: '#7CFC00', |
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lemonchiffon: '#FFFACD', |
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lightblue: '#ADD8E6', |
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lightcoral: '#F08080', |
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lightcyan: '#E0FFFF', |
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lightgoldenrodyellow: '#FAFAD2', |
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lightgreen: '#90EE90', |
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lightgrey: '#D3D3D3', |
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lightpink: '#FFB6C1', |
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lightsalmon: '#FFA07A', |
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lightseagreen: '#20B2AA', |
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lightskyblue: '#87CEFA', |
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lightslategray: '#778899', |
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lightslategrey: '#778899', |
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lightsteelblue: '#B0C4DE', |
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lightyellow: '#FFFFE0', |
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limegreen: '#32CD32', |
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linen: '#FAF0E6', |
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magenta: '#FF00FF', |
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mediumaquamarine: '#66CDAA', |
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mediumblue: '#0000CD', |
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mediumorchid: '#BA55D3', |
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mediumpurple: '#9370DB', |
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mediumseagreen: '#3CB371', |
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mediumslateblue: '#7B68EE', |
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mediumspringgreen: '#00FA9A', |
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mediumturquoise: '#48D1CC', |
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mediumvioletred: '#C71585', |
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midnightblue: '#191970', |
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mintcream: '#F5FFFA', |
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mistyrose: '#FFE4E1', |
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moccasin: '#FFE4B5', |
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navajowhite: '#FFDEAD', |
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oldlace: '#FDF5E6', |
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olivedrab: '#6B8E23', |
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orange: '#FFA500', |
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orangered: '#FF4500', |
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orchid: '#DA70D6', |
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palegoldenrod: '#EEE8AA', |
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palegreen: '#98FB98', |
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paleturquoise: '#AFEEEE', |
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palevioletred: '#DB7093', |
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papayawhip: '#FFEFD5', |
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peachpuff: '#FFDAB9', |
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peru: '#CD853F', |
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pink: '#FFC0CB', |
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plum: '#DDA0DD', |
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powderblue: '#B0E0E6', |
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rosybrown: '#BC8F8F', |
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royalblue: '#4169E1', |
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saddlebrown: '#8B4513', |
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salmon: '#FA8072', |
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sandybrown: '#F4A460', |
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seagreen: '#2E8B57', |
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seashell: '#FFF5EE', |
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sienna: '#A0522D', |
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skyblue: '#87CEEB', |
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slateblue: '#6A5ACD', |
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slategray: '#708090', |
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slategrey: '#708090', |
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snow: '#FFFAFA', |
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springgreen: '#00FF7F', |
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steelblue: '#4682B4', |
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tan: '#D2B48C', |
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thistle: '#D8BFD8', |
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tomato: '#FF6347', |
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turquoise: '#40E0D0', |
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violet: '#EE82EE', |
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wheat: '#F5DEB3', |
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whitesmoke: '#F5F5F5', |
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yellowgreen: '#9ACD32' |
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}; |
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|
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|
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function getRgbHslContent(styleString) { |
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var start = styleString.indexOf('(', 3); |
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var end = styleString.indexOf(')', start + 1); |
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var parts = styleString.substring(start + 1, end).split(','); |
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// add alpha if needed |
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if (parts.length == 4 && styleString.substr(3, 1) == 'a') { |
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alpha = Number(parts[3]); |
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} else { |
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parts[3] = 1; |
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} |
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return parts; |
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} |
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|
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function percent(s) { |
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return parseFloat(s) / 100; |
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} |
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|
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function clamp(v, min, max) { |
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return Math.min(max, Math.max(min, v)); |
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} |
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|
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function hslToRgb(parts){ |
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var r, g, b; |
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h = parseFloat(parts[0]) / 360 % 360; |
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if (h < 0) |
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h++; |
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s = clamp(percent(parts[1]), 0, 1); |
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l = clamp(percent(parts[2]), 0, 1); |
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if (s == 0) { |
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r = g = b = l; // achromatic |
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} else { |
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var q = l < 0.5 ? l * (1 + s) : l + s - l * s; |
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var p = 2 * l - q; |
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r = hueToRgb(p, q, h + 1 / 3); |
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g = hueToRgb(p, q, h); |
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b = hueToRgb(p, q, h - 1 / 3); |
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} |
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|
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return '#' + decToHex[Math.floor(r * 255)] + |
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decToHex[Math.floor(g * 255)] + |
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decToHex[Math.floor(b * 255)]; |
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} |
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|
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function hueToRgb(m1, m2, h) { |
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if (h < 0) |
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h++; |
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if (h > 1) |
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h--; |
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|
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if (6 * h < 1) |
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return m1 + (m2 - m1) * 6 * h; |
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else if (2 * h < 1) |
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return m2; |
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else if (3 * h < 2) |
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return m1 + (m2 - m1) * (2 / 3 - h) * 6; |
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else |
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return m1; |
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} |
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|
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function processStyle(styleString) { |
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var str, alpha = 1; |
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|
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styleString = String(styleString); |
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if (styleString.charAt(0) == '#') { |
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str = styleString; |
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} else if (/^rgb/.test(styleString)) { |
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var parts = getRgbHslContent(styleString); |
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var str = '#', n; |
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for (var i = 0; i < 3; i++) { |
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if (parts[i].indexOf('%') != -1) { |
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n = Math.floor(percent(parts[i]) * 255); |
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} else { |
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n = Number(parts[i]); |
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} |
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str += decToHex[clamp(n, 0, 255)]; |
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} |
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alpha = parts[3]; |
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} else if (/^hsl/.test(styleString)) { |
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var parts = getRgbHslContent(styleString); |
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str = hslToRgb(parts); |
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alpha = parts[3]; |
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} else { |
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str = colorData[styleString] || styleString; |
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} |
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return {color: str, alpha: alpha}; |
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} |
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|
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var DEFAULT_STYLE = { |
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style: 'normal', |
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variant: 'normal', |
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weight: 'normal', |
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size: 10, |
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family: 'sans-serif' |
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}; |
| 490 |
|
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// Internal text style cache |
| 492 |
var fontStyleCache = {}; |
| 493 |
|
| 494 |
function processFontStyle(styleString) { |
| 495 |
if (fontStyleCache[styleString]) { |
| 496 |
return fontStyleCache[styleString]; |
| 497 |
} |
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|
| 499 |
var el = document.createElement('div'); |
| 500 |
var style = el.style; |
| 501 |
try { |
| 502 |
style.font = styleString; |
| 503 |
} catch (ex) { |
| 504 |
// Ignore failures to set to invalid font. |
| 505 |
} |
| 506 |
|
| 507 |
return fontStyleCache[styleString] = { |
| 508 |
style: style.fontStyle || DEFAULT_STYLE.style, |
| 509 |
variant: style.fontVariant || DEFAULT_STYLE.variant, |
| 510 |
weight: style.fontWeight || DEFAULT_STYLE.weight, |
| 511 |
size: style.fontSize || DEFAULT_STYLE.size, |
| 512 |
family: style.fontFamily || DEFAULT_STYLE.family |
| 513 |
}; |
| 514 |
} |
| 515 |
|
| 516 |
function getComputedStyle(style, element) { |
| 517 |
var computedStyle = {}; |
| 518 |
|
| 519 |
for (var p in style) { |
| 520 |
computedStyle[p] = style[p]; |
| 521 |
} |
| 522 |
|
| 523 |
// Compute the size |
| 524 |
var canvasFontSize = parseFloat(element.currentStyle.fontSize), |
| 525 |
fontSize = parseFloat(style.size); |
| 526 |
|
| 527 |
if (typeof style.size == 'number') { |
| 528 |
computedStyle.size = style.size; |
| 529 |
} else if (style.size.indexOf('px') != -1) { |
| 530 |
computedStyle.size = fontSize; |
| 531 |
} else if (style.size.indexOf('em') != -1) { |
| 532 |
computedStyle.size = canvasFontSize * fontSize; |
| 533 |
} else if(style.size.indexOf('%') != -1) { |
| 534 |
computedStyle.size = (canvasFontSize / 100) * fontSize; |
| 535 |
} else if (style.size.indexOf('pt') != -1) { |
| 536 |
computedStyle.size = fontSize / .75; |
| 537 |
} else { |
| 538 |
computedStyle.size = canvasFontSize; |
| 539 |
} |
| 540 |
|
| 541 |
// Different scaling between normal text and VML text. This was found using |
| 542 |
// trial and error to get the same size as non VML text. |
| 543 |
computedStyle.size *= 0.981; |
| 544 |
|
| 545 |
return computedStyle; |
| 546 |
} |
| 547 |
|
| 548 |
function buildStyle(style) { |
| 549 |
return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + |
| 550 |
style.size + 'px ' + style.family; |
| 551 |
} |
| 552 |
|
| 553 |
function processLineCap(lineCap) { |
| 554 |
switch (lineCap) { |
| 555 |
case 'butt': |
| 556 |
return 'flat'; |
| 557 |
case 'round': |
| 558 |
return 'round'; |
| 559 |
case 'square': |
| 560 |
default: |
| 561 |
return 'square'; |
| 562 |
} |
| 563 |
} |
| 564 |
|
| 565 |
/** |
| 566 |
* This class implements CanvasRenderingContext2D interface as described by |
| 567 |
* the WHATWG. |
| 568 |
* @param {HTMLElement} surfaceElement The element that the 2D context should |
| 569 |
* be associated with |
| 570 |
*/ |
| 571 |
function CanvasRenderingContext2D_(surfaceElement) { |
| 572 |
this.m_ = createMatrixIdentity(); |
| 573 |
|
| 574 |
this.mStack_ = []; |
| 575 |
this.aStack_ = []; |
| 576 |
this.currentPath_ = []; |
| 577 |
|
| 578 |
// Canvas context properties |
| 579 |
this.strokeStyle = '#000'; |
| 580 |
this.fillStyle = '#000'; |
| 581 |
|
| 582 |
this.lineWidth = 1; |
| 583 |
this.lineJoin = 'miter'; |
| 584 |
this.lineCap = 'butt'; |
| 585 |
this.miterLimit = Z * 1; |
| 586 |
this.globalAlpha = 1; |
| 587 |
this.font = '10px sans-serif'; |
| 588 |
this.textAlign = 'left'; |
| 589 |
this.textBaseline = 'alphabetic'; |
| 590 |
this.canvas = surfaceElement; |
| 591 |
|
| 592 |
var el = surfaceElement.ownerDocument.createElement('div'); |
| 593 |
el.style.width = surfaceElement.clientWidth + 'px'; |
| 594 |
el.style.height = surfaceElement.clientHeight + 'px'; |
| 595 |
el.style.overflow = 'hidden'; |
| 596 |
el.style.position = 'absolute'; |
| 597 |
surfaceElement.appendChild(el); |
| 598 |
|
| 599 |
this.element_ = el; |
| 600 |
this.arcScaleX_ = 1; |
| 601 |
this.arcScaleY_ = 1; |
| 602 |
this.lineScale_ = 1; |
| 603 |
} |
| 604 |
|
| 605 |
var contextPrototype = CanvasRenderingContext2D_.prototype; |
| 606 |
contextPrototype.clearRect = function() { |
| 607 |
if (this.textMeasureEl_) { |
| 608 |
this.textMeasureEl_.removeNode(true); |
| 609 |
this.textMeasureEl_ = null; |
| 610 |
} |
| 611 |
this.element_.innerHTML = ''; |
| 612 |
}; |
| 613 |
|
| 614 |
contextPrototype.beginPath = function() { |
| 615 |
// TODO: Branch current matrix so that save/restore has no effect |
| 616 |
// as per safari docs. |
| 617 |
this.currentPath_ = []; |
| 618 |
}; |
| 619 |
|
| 620 |
contextPrototype.moveTo = function(aX, aY) { |
| 621 |
var p = this.getCoords_(aX, aY); |
| 622 |
this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); |
| 623 |
this.currentX_ = p.x; |
| 624 |
this.currentY_ = p.y; |
| 625 |
}; |
| 626 |
|
| 627 |
contextPrototype.lineTo = function(aX, aY) { |
| 628 |
var p = this.getCoords_(aX, aY); |
| 629 |
this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); |
| 630 |
|
| 631 |
this.currentX_ = p.x; |
| 632 |
this.currentY_ = p.y; |
| 633 |
}; |
| 634 |
|
| 635 |
contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, |
| 636 |
aCP2x, aCP2y, |
| 637 |
aX, aY) { |
| 638 |
var p = this.getCoords_(aX, aY); |
| 639 |
var cp1 = this.getCoords_(aCP1x, aCP1y); |
| 640 |
var cp2 = this.getCoords_(aCP2x, aCP2y); |
| 641 |
bezierCurveTo(this, cp1, cp2, p); |
| 642 |
}; |
| 643 |
|
| 644 |
// Helper function that takes the already fixed cordinates. |
| 645 |
function bezierCurveTo(self, cp1, cp2, p) { |
| 646 |
self.currentPath_.push({ |
| 647 |
type: 'bezierCurveTo', |
| 648 |
cp1x: cp1.x, |
| 649 |
cp1y: cp1.y, |
| 650 |
cp2x: cp2.x, |
| 651 |
cp2y: cp2.y, |
| 652 |
x: p.x, |
| 653 |
y: p.y |
| 654 |
}); |
| 655 |
self.currentX_ = p.x; |
| 656 |
self.currentY_ = p.y; |
| 657 |
} |
| 658 |
|
| 659 |
contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { |
| 660 |
// the following is lifted almost directly from |
| 661 |
// http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes |
| 662 |
|
| 663 |
var cp = this.getCoords_(aCPx, aCPy); |
| 664 |
var p = this.getCoords_(aX, aY); |
| 665 |
|
| 666 |
var cp1 = { |
| 667 |
x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), |
| 668 |
y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) |
| 669 |
}; |
| 670 |
var cp2 = { |
| 671 |
x: cp1.x + (p.x - this.currentX_) / 3.0, |
| 672 |
y: cp1.y + (p.y - this.currentY_) / 3.0 |
| 673 |
}; |
| 674 |
|
| 675 |
bezierCurveTo(this, cp1, cp2, p); |
| 676 |
}; |
| 677 |
|
| 678 |
contextPrototype.arc = function(aX, aY, aRadius, |
| 679 |
aStartAngle, aEndAngle, aClockwise) { |
| 680 |
aRadius *= Z; |
| 681 |
var arcType = aClockwise ? 'at' : 'wa'; |
| 682 |
|
| 683 |
var xStart = aX + mc(aStartAngle) * aRadius - Z2; |
| 684 |
var yStart = aY + ms(aStartAngle) * aRadius - Z2; |
| 685 |
|
| 686 |
var xEnd = aX + mc(aEndAngle) * aRadius - Z2; |
| 687 |
var yEnd = aY + ms(aEndAngle) * aRadius - Z2; |
| 688 |
|
| 689 |
// IE won't render arches drawn counter clockwise if xStart == xEnd. |
| 690 |
if (xStart == xEnd && !aClockwise) { |
| 691 |
xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something |
| 692 |
// that can be represented in binary |
| 693 |
} |
| 694 |
|
| 695 |
var p = this.getCoords_(aX, aY); |
| 696 |
var pStart = this.getCoords_(xStart, yStart); |
| 697 |
var pEnd = this.getCoords_(xEnd, yEnd); |
| 698 |
|
| 699 |
this.currentPath_.push({type: arcType, |
| 700 |
x: p.x, |
| 701 |
y: p.y, |
| 702 |
radius: aRadius, |
| 703 |
xStart: pStart.x, |
| 704 |
yStart: pStart.y, |
| 705 |
xEnd: pEnd.x, |
| 706 |
yEnd: pEnd.y}); |
| 707 |
|
| 708 |
}; |
| 709 |
|
| 710 |
contextPrototype.rect = function(aX, aY, aWidth, aHeight) { |
| 711 |
this.moveTo(aX, aY); |
| 712 |
this.lineTo(aX + aWidth, aY); |
| 713 |
this.lineTo(aX + aWidth, aY + aHeight); |
| 714 |
this.lineTo(aX, aY + aHeight); |
| 715 |
this.closePath(); |
| 716 |
}; |
| 717 |
|
| 718 |
contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { |
| 719 |
var oldPath = this.currentPath_; |
| 720 |
this.beginPath(); |
| 721 |
|
| 722 |
this.moveTo(aX, aY); |
| 723 |
this.lineTo(aX + aWidth, aY); |
| 724 |
this.lineTo(aX + aWidth, aY + aHeight); |
| 725 |
this.lineTo(aX, aY + aHeight); |
| 726 |
this.closePath(); |
| 727 |
this.stroke(); |
| 728 |
|
| 729 |
this.currentPath_ = oldPath; |
| 730 |
}; |
| 731 |
|
| 732 |
contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { |
| 733 |
var oldPath = this.currentPath_; |
| 734 |
this.beginPath(); |
| 735 |
|
| 736 |
this.moveTo(aX, aY); |
| 737 |
this.lineTo(aX + aWidth, aY); |
| 738 |
this.lineTo(aX + aWidth, aY + aHeight); |
| 739 |
this.lineTo(aX, aY + aHeight); |
| 740 |
this.closePath(); |
| 741 |
this.fill(); |
| 742 |
|
| 743 |
this.currentPath_ = oldPath; |
| 744 |
}; |
| 745 |
|
| 746 |
contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { |
| 747 |
var gradient = new CanvasGradient_('gradient'); |
| 748 |
gradient.x0_ = aX0; |
| 749 |
gradient.y0_ = aY0; |
| 750 |
gradient.x1_ = aX1; |
| 751 |
gradient.y1_ = aY1; |
| 752 |
return gradient; |
| 753 |
}; |
| 754 |
|
| 755 |
contextPrototype.createRadialGradient = function(aX0, aY0, aR0, |
| 756 |
aX1, aY1, aR1) { |
| 757 |
var gradient = new CanvasGradient_('gradientradial'); |
| 758 |
gradient.x0_ = aX0; |
| 759 |
gradient.y0_ = aY0; |
| 760 |
gradient.r0_ = aR0; |
| 761 |
gradient.x1_ = aX1; |
| 762 |
gradient.y1_ = aY1; |
| 763 |
gradient.r1_ = aR1; |
| 764 |
return gradient; |
| 765 |
}; |
| 766 |
|
| 767 |
contextPrototype.drawImage = function(image, var_args) { |
| 768 |
var dx, dy, dw, dh, sx, sy, sw, sh; |
| 769 |
|
| 770 |
// to find the original width we overide the width and height |
| 771 |
var oldRuntimeWidth = image.runtimeStyle.width; |
| 772 |
var oldRuntimeHeight = image.runtimeStyle.height; |
| 773 |
image.runtimeStyle.width = 'auto'; |
| 774 |
image.runtimeStyle.height = 'auto'; |
| 775 |
|
| 776 |
// get the original size |
| 777 |
var w = image.width; |
| 778 |
var h = image.height; |
| 779 |
|
| 780 |
// and remove overides |
| 781 |
image.runtimeStyle.width = oldRuntimeWidth; |
| 782 |
image.runtimeStyle.height = oldRuntimeHeight; |
| 783 |
|
| 784 |
if (arguments.length == 3) { |
| 785 |
dx = arguments[1]; |
| 786 |
dy = arguments[2]; |
| 787 |
sx = sy = 0; |
| 788 |
sw = dw = w; |
| 789 |
sh = dh = h; |
| 790 |
} else if (arguments.length == 5) { |
| 791 |
dx = arguments[1]; |
| 792 |
dy = arguments[2]; |
| 793 |
dw = arguments[3]; |
| 794 |
dh = arguments[4]; |
| 795 |
sx = sy = 0; |
| 796 |
sw = w; |
| 797 |
sh = h; |
| 798 |
} else if (arguments.length == 9) { |
| 799 |
sx = arguments[1]; |
| 800 |
sy = arguments[2]; |
| 801 |
sw = arguments[3]; |
| 802 |
sh = arguments[4]; |
| 803 |
dx = arguments[5]; |
| 804 |
dy = arguments[6]; |
| 805 |
dw = arguments[7]; |
| 806 |
dh = arguments[8]; |
| 807 |
} else { |
| 808 |
throw Error('Invalid number of arguments'); |
| 809 |
} |
| 810 |
|
| 811 |
var d = this.getCoords_(dx, dy); |
| 812 |
|
| 813 |
var w2 = sw / 2; |
| 814 |
var h2 = sh / 2; |
| 815 |
|
| 816 |
var vmlStr = []; |
| 817 |
|
| 818 |
var W = 10; |
| 819 |
var H = 10; |
| 820 |
|
| 821 |
// For some reason that I've now forgotten, using divs didn't work |
| 822 |
vmlStr.push(' <g_vml_:group', |
| 823 |
' coordsize="', Z * W, ',', Z * H, '"', |
| 824 |
' coordorigin="0,0"' , |
| 825 |
' style="width:', W, 'px;height:', H, 'px;position:absolute;'); |
| 826 |
|
| 827 |
// If filters are necessary (rotation exists), create them |
| 828 |
// filters are bog-slow, so only create them if abbsolutely necessary |
| 829 |
// The following check doesn't account for skews (which don't exist |
| 830 |
// in the canvas spec (yet) anyway. |
| 831 |
|
| 832 |
if (this.m_[0][0] != 1 || this.m_[0][1] || |
| 833 |
this.m_[1][1] != 1 || this.m_[1][0]) { |
| 834 |
var filter = []; |
| 835 |
|
| 836 |
// Note the 12/21 reversal |
| 837 |
filter.push('M11=', this.m_[0][0], ',', |
| 838 |
'M12=', this.m_[1][0], ',', |
| 839 |
'M21=', this.m_[0][1], ',', |
| 840 |
'M22=', this.m_[1][1], ',', |
| 841 |
'Dx=', mr(d.x / Z), ',', |
| 842 |
'Dy=', mr(d.y / Z), ''); |
| 843 |
|
| 844 |
// Bounding box calculation (need to minimize displayed area so that |
| 845 |
// filters don't waste time on unused pixels. |
| 846 |
var max = d; |
| 847 |
var c2 = this.getCoords_(dx + dw, dy); |
| 848 |
var c3 = this.getCoords_(dx, dy + dh); |
| 849 |
var c4 = this.getCoords_(dx + dw, dy + dh); |
| 850 |
|
| 851 |
max.x = m.max(max.x, c2.x, c3.x, c4.x); |
| 852 |
max.y = m.max(max.y, c2.y, c3.y, c4.y); |
| 853 |
|
| 854 |
vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), |
| 855 |
'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', |
| 856 |
filter.join(''), ", sizingmethod='clip');"); |
| 857 |
|
| 858 |
} else { |
| 859 |
vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); |
| 860 |
} |
| 861 |
|
| 862 |
vmlStr.push(' ">' , |
| 863 |
'<g_vml_:image src="', image.src, '"', |
| 864 |
' style="width:', Z * dw, 'px;', |
| 865 |
' height:', Z * dh, 'px"', |
| 866 |
' cropleft="', sx / w, '"', |
| 867 |
' croptop="', sy / h, '"', |
| 868 |
' cropright="', (w - sx - sw) / w, '"', |
| 869 |
' cropbottom="', (h - sy - sh) / h, '"', |
| 870 |
' />', |
| 871 |
'</g_vml_:group>'); |
| 872 |
|
| 873 |
this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); |
| 874 |
}; |
| 875 |
|
| 876 |
contextPrototype.stroke = function(aFill) { |
| 877 |
var W = 10; |
| 878 |
var H = 10; |
| 879 |
// Divide the shape into chunks if it's too long because IE has a limit |
| 880 |
// somewhere for how long a VML shape can be. This simple division does |
| 881 |
// not work with fills, only strokes, unfortunately. |
| 882 |
var chunkSize = 5000; |
| 883 |
|
| 884 |
var min = {x: null, y: null}; |
| 885 |
var max = {x: null, y: null}; |
| 886 |
|
| 887 |
for (var j = 0; j < this.currentPath_.length; j += chunkSize) { |
| 888 |
var lineStr = []; |
| 889 |
var lineOpen = false; |
| 890 |
|
| 891 |
lineStr.push('<g_vml_:shape', |
| 892 |
' filled="', !!aFill, '"', |
| 893 |
' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
| 894 |
' coordorigin="0,0"', |
| 895 |
' coordsize="', Z * W, ',', Z * H, '"', |
| 896 |
' stroked="', !aFill, '"', |
| 897 |
' path="'); |
| 898 |
|
| 899 |
var newSeq = false; |
| 900 |
|
| 901 |
for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { |
| 902 |
if (i % chunkSize == 0 && i > 0) { // move into position for next chunk |
| 903 |
lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); |
| 904 |
} |
| 905 |
|
| 906 |
var p = this.currentPath_[i]; |
| 907 |
var c; |
| 908 |
|
| 909 |
switch (p.type) { |
| 910 |
case 'moveTo': |
| 911 |
c = p; |
| 912 |
lineStr.push(' m ', mr(p.x), ',', mr(p.y)); |
| 913 |
break; |
| 914 |
case 'lineTo': |
| 915 |
lineStr.push(' l ', mr(p.x), ',', mr(p.y)); |
| 916 |
break; |
| 917 |
case 'close': |
| 918 |
lineStr.push(' x '); |
| 919 |
p = null; |
| 920 |
break; |
| 921 |
case 'bezierCurveTo': |
| 922 |
lineStr.push(' c ', |
| 923 |
mr(p.cp1x), ',', mr(p.cp1y), ',', |
| 924 |
mr(p.cp2x), ',', mr(p.cp2y), ',', |
| 925 |
mr(p.x), ',', mr(p.y)); |
| 926 |
break; |
| 927 |
case 'at': |
| 928 |
case 'wa': |
| 929 |
lineStr.push(' ', p.type, ' ', |
| 930 |
mr(p.x - this.arcScaleX_ * p.radius), ',', |
| 931 |
mr(p.y - this.arcScaleY_ * p.radius), ' ', |
| 932 |
mr(p.x + this.arcScaleX_ * p.radius), ',', |
| 933 |
mr(p.y + this.arcScaleY_ * p.radius), ' ', |
| 934 |
mr(p.xStart), ',', mr(p.yStart), ' ', |
| 935 |
mr(p.xEnd), ',', mr(p.yEnd)); |
| 936 |
break; |
| 937 |
} |
| 938 |
|
| 939 |
|
| 940 |
// TODO: Following is broken for curves due to |
| 941 |
// move to proper paths. |
| 942 |
|
| 943 |
// Figure out dimensions so we can do gradient fills |
| 944 |
// properly |
| 945 |
if (p) { |
| 946 |
if (min.x == null || p.x < min.x) { |
| 947 |
min.x = p.x; |
| 948 |
} |
| 949 |
if (max.x == null || p.x > max.x) { |
| 950 |
max.x = p.x; |
| 951 |
} |
| 952 |
if (min.y == null || p.y < min.y) { |
| 953 |
min.y = p.y; |
| 954 |
} |
| 955 |
if (max.y == null || p.y > max.y) { |
| 956 |
max.y = p.y; |
| 957 |
} |
| 958 |
} |
| 959 |
} |
| 960 |
lineStr.push(' ">'); |
| 961 |
|
| 962 |
if (!aFill) { |
| 963 |
appendStroke(this, lineStr); |
| 964 |
} else { |
| 965 |
appendFill(this, lineStr, min, max); |
| 966 |
} |
| 967 |
|
| 968 |
lineStr.push('</g_vml_:shape>'); |
| 969 |
|
| 970 |
this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
| 971 |
} |
| 972 |
}; |
| 973 |
|
| 974 |
function appendStroke(ctx, lineStr) { |
| 975 |
var a = processStyle(ctx.strokeStyle); |
| 976 |
var color = a.color; |
| 977 |
var opacity = a.alpha * ctx.globalAlpha; |
| 978 |
var lineWidth = ctx.lineScale_ * ctx.lineWidth; |
| 979 |
|
| 980 |
// VML cannot correctly render a line if the width is less than 1px. |
| 981 |
// In that case, we dilute the color to make the line look thinner. |
| 982 |
if (lineWidth < 1) { |
| 983 |
opacity *= lineWidth; |
| 984 |
} |
| 985 |
|
| 986 |
lineStr.push( |
| 987 |
'<g_vml_:stroke', |
| 988 |
' opacity="', opacity, '"', |
| 989 |
' joinstyle="', ctx.lineJoin, '"', |
| 990 |
' miterlimit="', ctx.miterLimit, '"', |
| 991 |
' endcap="', processLineCap(ctx.lineCap), '"', |
| 992 |
' weight="', lineWidth, 'px"', |
| 993 |
' color="', color, '" />' |
| 994 |
); |
| 995 |
} |
| 996 |
|
| 997 |
function appendFill(ctx, lineStr, min, max) { |
| 998 |
var fillStyle = ctx.fillStyle; |
| 999 |
var arcScaleX = ctx.arcScaleX_; |
| 1000 |
var arcScaleY = ctx.arcScaleY_; |
| 1001 |
var width = max.x - min.x; |
| 1002 |
var height = max.y - min.y; |
| 1003 |
if (fillStyle instanceof CanvasGradient_) { |
| 1004 |
// TODO: Gradients transformed with the transformation matrix. |
| 1005 |
var angle = 0; |
| 1006 |
var focus = {x: 0, y: 0}; |
| 1007 |
|
| 1008 |
// additional offset |
| 1009 |
var shift = 0; |
| 1010 |
// scale factor for offset |
| 1011 |
var expansion = 1; |
| 1012 |
|
| 1013 |
if (fillStyle.type_ == 'gradient') { |
| 1014 |
var x0 = fillStyle.x0_ / arcScaleX; |
| 1015 |
var y0 = fillStyle.y0_ / arcScaleY; |
| 1016 |
var x1 = fillStyle.x1_ / arcScaleX; |
| 1017 |
var y1 = fillStyle.y1_ / arcScaleY; |
| 1018 |
var p0 = ctx.getCoords_(x0, y0); |
| 1019 |
var p1 = ctx.getCoords_(x1, y1); |
| 1020 |
var dx = p1.x - p0.x; |
| 1021 |
var dy = p1.y - p0.y; |
| 1022 |
angle = Math.atan2(dx, dy) * 180 / Math.PI; |
| 1023 |
|
| 1024 |
// The angle should be a non-negative number. |
| 1025 |
if (angle < 0) { |
| 1026 |
angle += 360; |
| 1027 |
} |
| 1028 |
|
| 1029 |
// Very small angles produce an unexpected result because they are |
| 1030 |
// converted to a scientific notation string. |
| 1031 |
if (angle < 1e-6) { |
| 1032 |
angle = 0; |
| 1033 |
} |
| 1034 |
} else { |
| 1035 |
var p0 = ctx.getCoords_(fillStyle.x0_, fillStyle.y0_); |
| 1036 |
focus = { |
| 1037 |
x: (p0.x - min.x) / width, |
| 1038 |
y: (p0.y - min.y) / height |
| 1039 |
}; |
| 1040 |
|
| 1041 |
width /= arcScaleX * Z; |
| 1042 |
height /= arcScaleY * Z; |
| 1043 |
var dimension = m.max(width, height); |
| 1044 |
shift = 2 * fillStyle.r0_ / dimension; |
| 1045 |
expansion = 2 * fillStyle.r1_ / dimension - shift; |
| 1046 |
} |
| 1047 |
|
| 1048 |
// We need to sort the color stops in ascending order by offset, |
| 1049 |
// otherwise IE won't interpret it correctly. |
| 1050 |
var stops = fillStyle.colors_; |
| 1051 |
stops.sort(function(cs1, cs2) { |
| 1052 |
return cs1.offset - cs2.offset; |
| 1053 |
}); |
| 1054 |
|
| 1055 |
var length = stops.length; |
| 1056 |
var color1 = stops[0].color; |
| 1057 |
var color2 = stops[length - 1].color; |
| 1058 |
var opacity1 = stops[0].alpha * ctx.globalAlpha; |
| 1059 |
var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; |
| 1060 |
|
| 1061 |
var colors = []; |
| 1062 |
for (var i = 0; i < length; i++) { |
| 1063 |
var stop = stops[i]; |
| 1064 |
colors.push(stop.offset * expansion + shift + ' ' + stop.color); |
| 1065 |
} |
| 1066 |
|
| 1067 |
// When colors attribute is used, the meanings of opacity and o:opacity2 |
| 1068 |
// are reversed. |
| 1069 |
lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', |
| 1070 |
' method="none" focus="100%"', |
| 1071 |
' color="', color1, '"', |
| 1072 |
' color2="', color2, '"', |
| 1073 |
' colors="', colors.join(','), '"', |
| 1074 |
' opacity="', opacity2, '"', |
| 1075 |
' g_o_:opacity2="', opacity1, '"', |
| 1076 |
' angle="', angle, '"', |
| 1077 |
' focusposition="', focus.x, ',', focus.y, '" />'); |
| 1078 |
} else if (fillStyle instanceof CanvasPattern_) { |
| 1079 |
if (width && height) { |
| 1080 |
var deltaLeft = -min.x; |
| 1081 |
var deltaTop = -min.y; |
| 1082 |
lineStr.push('<g_vml_:fill', |
| 1083 |
' position="', |
| 1084 |
deltaLeft / width * arcScaleX * arcScaleX, ',', |
| 1085 |
deltaTop / height * arcScaleY * arcScaleY, '"', |
| 1086 |
' type="tile"', |
| 1087 |
// TODO: Figure out the correct size to fit the scale. |
| 1088 |
//' size="', w, 'px ', h, 'px"', |
| 1089 |
' src="', fillStyle.src_, '" />'); |
| 1090 |
} |
| 1091 |
} else { |
| 1092 |
var a = processStyle(ctx.fillStyle); |
| 1093 |
var color = a.color; |
| 1094 |
var opacity = a.alpha * ctx.globalAlpha; |
| 1095 |
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, |
| 1096 |
'" />'); |
| 1097 |
} |
| 1098 |
} |
| 1099 |
|
| 1100 |
contextPrototype.fill = function() { |
| 1101 |
this.stroke(true); |
| 1102 |
}; |
| 1103 |
|
| 1104 |
contextPrototype.closePath = function() { |
| 1105 |
this.currentPath_.push({type: 'close'}); |
| 1106 |
}; |
| 1107 |
|
| 1108 |
/** |
| 1109 |
* @private |
| 1110 |
*/ |
| 1111 |
contextPrototype.getCoords_ = function(aX, aY) { |
| 1112 |
var m = this.m_; |
| 1113 |
return { |
| 1114 |
x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, |
| 1115 |
y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 |
| 1116 |
}; |
| 1117 |
}; |
| 1118 |
|
| 1119 |
contextPrototype.save = function() { |
| 1120 |
var o = {}; |
| 1121 |
copyState(this, o); |
| 1122 |
this.aStack_.push(o); |
| 1123 |
this.mStack_.push(this.m_); |
| 1124 |
this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); |
| 1125 |
}; |
| 1126 |
|
| 1127 |
contextPrototype.restore = function() { |
| 1128 |
if (this.aStack_.length) { |
| 1129 |
copyState(this.aStack_.pop(), this); |
| 1130 |
this.m_ = this.mStack_.pop(); |
| 1131 |
} |
| 1132 |
}; |
| 1133 |
|
| 1134 |
function matrixIsFinite(m) { |
| 1135 |
return isFinite(m[0][0]) && isFinite(m[0][1]) && |
| 1136 |
isFinite(m[1][0]) && isFinite(m[1][1]) && |
| 1137 |
isFinite(m[2][0]) && isFinite(m[2][1]); |
| 1138 |
} |
| 1139 |
|
| 1140 |
function setM(ctx, m, updateLineScale) { |
| 1141 |
if (!matrixIsFinite(m)) { |
| 1142 |
return; |
| 1143 |
} |
| 1144 |
ctx.m_ = m; |
| 1145 |
|
| 1146 |
if (updateLineScale) { |
| 1147 |
// Get the line scale. |
| 1148 |
// Determinant of this.m_ means how much the area is enlarged by the |
| 1149 |
// transformation. So its square root can be used as a scale factor |
| 1150 |
// for width. |
| 1151 |
var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; |
| 1152 |
ctx.lineScale_ = sqrt(abs(det)); |
| 1153 |
} |
| 1154 |
} |
| 1155 |
|
| 1156 |
contextPrototype.translate = function(aX, aY) { |
| 1157 |
var m1 = [ |
| 1158 |
[1, 0, 0], |
| 1159 |
[0, 1, 0], |
| 1160 |
[aX, aY, 1] |
| 1161 |
]; |
| 1162 |
|
| 1163 |
setM(this, matrixMultiply(m1, this.m_), false); |
| 1164 |
}; |
| 1165 |
|
| 1166 |
contextPrototype.rotate = function(aRot) { |
| 1167 |
var c = mc(aRot); |
| 1168 |
var s = ms(aRot); |
| 1169 |
|
| 1170 |
var m1 = [ |
| 1171 |
[c, s, 0], |
| 1172 |
[-s, c, 0], |
| 1173 |
[0, 0, 1] |
| 1174 |
]; |
| 1175 |
|
| 1176 |
setM(this, matrixMultiply(m1, this.m_), false); |
| 1177 |
}; |
| 1178 |
|
| 1179 |
contextPrototype.scale = function(aX, aY) { |
| 1180 |
this.arcScaleX_ *= aX; |
| 1181 |
this.arcScaleY_ *= aY; |
| 1182 |
var m1 = [ |
| 1183 |
[aX, 0, 0], |
| 1184 |
[0, aY, 0], |
| 1185 |
[0, 0, 1] |
| 1186 |
]; |
| 1187 |
|
| 1188 |
setM(this, matrixMultiply(m1, this.m_), true); |
| 1189 |
}; |
| 1190 |
|
| 1191 |
contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { |
| 1192 |
var m1 = [ |
| 1193 |
[m11, m12, 0], |
| 1194 |
[m21, m22, 0], |
| 1195 |
[dx, dy, 1] |
| 1196 |
]; |
| 1197 |
|
| 1198 |
setM(this, matrixMultiply(m1, this.m_), true); |
| 1199 |
}; |
| 1200 |
|
| 1201 |
contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { |
| 1202 |
var m = [ |
| 1203 |
[m11, m12, 0], |
| 1204 |
[m21, m22, 0], |
| 1205 |
[dx, dy, 1] |
| 1206 |
]; |
| 1207 |
|
| 1208 |
setM(this, m, true); |
| 1209 |
}; |
| 1210 |
|
| 1211 |
/** |
| 1212 |
* The text drawing function. |
| 1213 |
* The maxWidth argument isn't taken in account, since no browser supports |
| 1214 |
* it yet. |
| 1215 |
*/ |
| 1216 |
contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { |
| 1217 |
var m = this.m_, |
| 1218 |
delta = 1000, |
| 1219 |
left = 0, |
| 1220 |
right = delta, |
| 1221 |
offset = {x: 0, y: 0}, |
| 1222 |
lineStr = []; |
| 1223 |
|
| 1224 |
var fontStyle = getComputedStyle(processFontStyle(this.font), |
| 1225 |
this.element_); |
| 1226 |
|
| 1227 |
var fontStyleString = buildStyle(fontStyle); |
| 1228 |
|
| 1229 |
var elementStyle = this.element_.currentStyle; |
| 1230 |
var textAlign = this.textAlign.toLowerCase(); |
| 1231 |
switch (textAlign) { |
| 1232 |
case 'left': |
| 1233 |
case 'center': |
| 1234 |
case 'right': |
| 1235 |
break; |
| 1236 |
case 'end': |
| 1237 |
textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; |
| 1238 |
break; |
| 1239 |
case 'start': |
| 1240 |
textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; |
| 1241 |
break; |
| 1242 |
default: |
| 1243 |
textAlign = 'left'; |
| 1244 |
} |
| 1245 |
|
| 1246 |
// 1.75 is an arbitrary number, as there is no info about the text baseline |
| 1247 |
switch (this.textBaseline) { |
| 1248 |
case 'hanging': |
| 1249 |
case 'top': |
| 1250 |
offset.y = fontStyle.size / 1.75; |
| 1251 |
break; |
| 1252 |
case 'middle': |
| 1253 |
break; |
| 1254 |
default: |
| 1255 |
case null: |
| 1256 |
case 'alphabetic': |
| 1257 |
case 'ideographic': |
| 1258 |
case 'bottom': |
| 1259 |
offset.y = -fontStyle.size / 2.25; |
| 1260 |
break; |
| 1261 |
} |
| 1262 |
|
| 1263 |
switch(textAlign) { |
| 1264 |
case 'right': |
| 1265 |
left = delta; |
| 1266 |
right = 0.05; |
| 1267 |
break; |
| 1268 |
case 'center': |
| 1269 |
left = right = delta / 2; |
| 1270 |
break; |
| 1271 |
} |
| 1272 |
|
| 1273 |
var d = this.getCoords_(x + offset.x, y + offset.y); |
| 1274 |
|
| 1275 |
lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', |
| 1276 |
' coordsize="100 100" coordorigin="0 0"', |
| 1277 |
' filled="', !stroke, '" stroked="', !!stroke, |
| 1278 |
'" style="position:absolute;width:1px;height:1px;">'); |
| 1279 |
|
| 1280 |
if (stroke) { |
| 1281 |
appendStroke(this, lineStr); |
| 1282 |
} else { |
| 1283 |
// TODO: Fix the min and max params. |
| 1284 |
appendFill(this, lineStr, {x: -left, y: 0}, |
| 1285 |
{x: right, y: fontStyle.size}); |
| 1286 |
} |
| 1287 |
|
| 1288 |
var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + |
| 1289 |
m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; |
| 1290 |
|
| 1291 |
var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); |
| 1292 |
|
| 1293 |
lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', |
| 1294 |
' offset="', skewOffset, '" origin="', left ,' 0" />', |
| 1295 |
'<g_vml_:path textpathok="true" />', |
| 1296 |
'<g_vml_:textpath on="true" string="', |
| 1297 |
encodeHtmlAttribute(text), |
| 1298 |
'" style="v-text-align:', textAlign, |
| 1299 |
';font:', encodeHtmlAttribute(fontStyleString), |
| 1300 |
'" /></g_vml_:line>'); |
| 1301 |
|
| 1302 |
this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
| 1303 |
}; |
| 1304 |
|
| 1305 |
contextPrototype.fillText = function(text, x, y, maxWidth) { |
| 1306 |
this.drawText_(text, x, y, maxWidth, false); |
| 1307 |
}; |
| 1308 |
|
| 1309 |
contextPrototype.strokeText = function(text, x, y, maxWidth) { |
| 1310 |
this.drawText_(text, x, y, maxWidth, true); |
| 1311 |
}; |
| 1312 |
|
| 1313 |
contextPrototype.measureText = function(text) { |
| 1314 |
if (!this.textMeasureEl_) { |
| 1315 |
var s = '<span style="position:absolute;' + |
| 1316 |
'top:-20000px;left:0;padding:0;margin:0;border:none;' + |
| 1317 |
'white-space:pre;"></span>'; |
| 1318 |
this.element_.insertAdjacentHTML('beforeEnd', s); |
| 1319 |
this.textMeasureEl_ = this.element_.lastChild; |
| 1320 |
} |
| 1321 |
var doc = this.element_.ownerDocument; |
| 1322 |
this.textMeasureEl_.innerHTML = ''; |
| 1323 |
this.textMeasureEl_.style.font = this.font; |
| 1324 |
// Don't use innerHTML or innerText because they allow markup/whitespace. |
| 1325 |
this.textMeasureEl_.appendChild(doc.createTextNode(text)); |
| 1326 |
return {width: this.textMeasureEl_.offsetWidth}; |
| 1327 |
}; |
| 1328 |
|
| 1329 |
/******** STUBS ********/ |
| 1330 |
contextPrototype.clip = function() { |
| 1331 |
// TODO: Implement |
| 1332 |
}; |
| 1333 |
|
| 1334 |
contextPrototype.arcTo = function() { |
| 1335 |
// TODO: Implement |
| 1336 |
}; |
| 1337 |
|
| 1338 |
contextPrototype.createPattern = function(image, repetition) { |
| 1339 |
return new CanvasPattern_(image, repetition); |
| 1340 |
}; |
| 1341 |
|
| 1342 |
// Gradient / Pattern Stubs |
| 1343 |
function CanvasGradient_(aType) { |
| 1344 |
this.type_ = aType; |
| 1345 |
this.x0_ = 0; |
| 1346 |
this.y0_ = 0; |
| 1347 |
this.r0_ = 0; |
| 1348 |
this.x1_ = 0; |
| 1349 |
this.y1_ = 0; |
| 1350 |
this.r1_ = 0; |
| 1351 |
this.colors_ = []; |
| 1352 |
} |
| 1353 |
|
| 1354 |
CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { |
| 1355 |
aColor = processStyle(aColor); |
| 1356 |
this.colors_.push({offset: aOffset, |
| 1357 |
color: aColor.color, |
| 1358 |
alpha: aColor.alpha}); |
| 1359 |
}; |
| 1360 |
|
| 1361 |
function CanvasPattern_(image, repetition) { |
| 1362 |
assertImageIsValid(image); |
| 1363 |
switch (repetition) { |
| 1364 |
case 'repeat': |
| 1365 |
case null: |
| 1366 |
case '': |
| 1367 |
this.repetition_ = 'repeat'; |
| 1368 |
break |
| 1369 |
case 'repeat-x': |
| 1370 |
case 'repeat-y': |
| 1371 |
case 'no-repeat': |
| 1372 |
this.repetition_ = repetition; |
| 1373 |
break; |
| 1374 |
default: |
| 1375 |
throwException('SYNTAX_ERR'); |
| 1376 |
} |
| 1377 |
|
| 1378 |
this.src_ = image.src; |
| 1379 |
this.width_ = image.width; |
| 1380 |
this.height_ = image.height; |
| 1381 |
} |
| 1382 |
|
| 1383 |
function throwException(s) { |
| 1384 |
throw new DOMException_(s); |
| 1385 |
} |
| 1386 |
|
| 1387 |
function assertImageIsValid(img) { |
| 1388 |
if (!img || img.nodeType != 1 || img.tagName != 'IMG') { |
| 1389 |
throwException('TYPE_MISMATCH_ERR'); |
| 1390 |
} |
| 1391 |
if (img.readyState != 'complete') { |
| 1392 |
throwException('INVALID_STATE_ERR'); |
| 1393 |
} |
| 1394 |
} |
| 1395 |
|
| 1396 |
function DOMException_(s) { |
| 1397 |
this.code = this[s]; |
| 1398 |
this.message = s +': DOM Exception ' + this.code; |
| 1399 |
} |
| 1400 |
var p = DOMException_.prototype = new Error; |
| 1401 |
p.INDEX_SIZE_ERR = 1; |
| 1402 |
p.DOMSTRING_SIZE_ERR = 2; |
| 1403 |
p.HIERARCHY_REQUEST_ERR = 3; |
| 1404 |
p.WRONG_DOCUMENT_ERR = 4; |
| 1405 |
p.INVALID_CHARACTER_ERR = 5; |
| 1406 |
p.NO_DATA_ALLOWED_ERR = 6; |
| 1407 |
p.NO_MODIFICATION_ALLOWED_ERR = 7; |
| 1408 |
p.NOT_FOUND_ERR = 8; |
| 1409 |
p.NOT_SUPPORTED_ERR = 9; |
| 1410 |
p.INUSE_ATTRIBUTE_ERR = 10; |
| 1411 |
p.INVALID_STATE_ERR = 11; |
| 1412 |
p.SYNTAX_ERR = 12; |
| 1413 |
p.INVALID_MODIFICATION_ERR = 13; |
| 1414 |
p.NAMESPACE_ERR = 14; |
| 1415 |
p.INVALID_ACCESS_ERR = 15; |
| 1416 |
p.VALIDATION_ERR = 16; |
| 1417 |
p.TYPE_MISMATCH_ERR = 17; |
| 1418 |
|
| 1419 |
// set up externs |
| 1420 |
G_vmlCanvasManager = G_vmlCanvasManager_; |
| 1421 |
CanvasRenderingContext2D = CanvasRenderingContext2D_; |
| 1422 |
CanvasGradient = CanvasGradient_; |
| 1423 |
CanvasPattern = CanvasPattern_; |
| 1424 |
DOMException = DOMException_; |
| 1425 |
})(); |
| 1426 |
|
| 1427 |
} // if |
| 1428 |
|
