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1428 lines
41 KiB
1428 lines
41 KiB
// 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 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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// 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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var IE_VERSION = +navigator.userAgent.match(/MSIE ([\d.]+)?/)[1]; |
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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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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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function encodeHtmlAttribute(s) { |
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return String(s).replace(/&/g, '&').replace(/"/g, '"'); |
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} |
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function addNamespace(doc, prefix, urn) { |
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if (!doc.namespaces[prefix]) { |
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doc.namespaces.add(prefix, urn, '#default#VML'); |
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} |
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} |
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function addNamespacesAndStylesheet(doc) { |
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addNamespace(doc, 'g_vml_', 'urn:schemas-microsoft-com:vml'); |
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addNamespace(doc, 'g_o_', 'urn:schemas-microsoft-com:office:office'); |
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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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// Add namespaces and stylesheet at startup. |
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addNamespacesAndStylesheet(document); |
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var G_vmlCanvasManager_ = { |
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init: function(opt_doc) { |
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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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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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* 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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// Add namespaces and stylesheet to document of the element. |
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addNamespacesAndStylesheet(el.ownerDocument); |
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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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// 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.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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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 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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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.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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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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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.charAt(3) != 'a') { |
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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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function percent(s) { |
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return parseFloat(s) / 100; |
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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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function hslToRgb(parts){ |
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var r, g, b, h, s, l; |
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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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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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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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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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var processStyleCache = {}; |
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function processStyle(styleString) { |
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if (styleString in processStyleCache) { |
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return processStyleCache[styleString]; |
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} |
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var str, alpha = 1; |
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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 = +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 processStyleCache[styleString] = {color: str, alpha: alpha}; |
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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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}; |
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// Internal text style cache |
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var fontStyleCache = {}; |
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function processFontStyle(styleString) { |
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if (fontStyleCache[styleString]) { |
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return fontStyleCache[styleString]; |
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} |
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var el = document.createElement('div'); |
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var style = el.style; |
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try { |
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style.font = styleString; |
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} catch (ex) { |
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// Ignore failures to set to invalid font. |
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} |
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return fontStyleCache[styleString] = { |
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style: style.fontStyle || DEFAULT_STYLE.style, |
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variant: style.fontVariant || DEFAULT_STYLE.variant, |
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weight: style.fontWeight || DEFAULT_STYLE.weight, |
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size: style.fontSize || DEFAULT_STYLE.size, |
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family: style.fontFamily || DEFAULT_STYLE.family |
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}; |
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} |
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function getComputedStyle(style, element) { |
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var computedStyle = {}; |
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for (var p in style) { |
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computedStyle[p] = style[p]; |
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} |
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|
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// Compute the size |
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var canvasFontSize = parseFloat(element.currentStyle.fontSize), |
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fontSize = parseFloat(style.size); |
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if (typeof style.size == 'number') { |
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computedStyle.size = style.size; |
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} else if (style.size.indexOf('px') != -1) { |
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computedStyle.size = fontSize; |
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} else if (style.size.indexOf('em') != -1) { |
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computedStyle.size = canvasFontSize * fontSize; |
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} else if(style.size.indexOf('%') != -1) { |
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computedStyle.size = (canvasFontSize / 100) * fontSize; |
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} else if (style.size.indexOf('pt') != -1) { |
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computedStyle.size = fontSize / .75; |
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} else { |
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computedStyle.size = canvasFontSize; |
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} |
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|
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// Different scaling between normal text and VML text. This was found using |
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// trial and error to get the same size as non VML text. |
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computedStyle.size *= 0.981; |
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|
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return computedStyle; |
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} |
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|
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function buildStyle(style) { |
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return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + |
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style.size + 'px ' + style.family; |
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} |
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|
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var lineCapMap = { |
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'butt': 'flat', |
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'round': 'round' |
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}; |
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|
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function processLineCap(lineCap) { |
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return lineCapMap[lineCap] || '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} canvasElement The element that the 2D context should |
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* be associated with |
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*/ |
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function CanvasRenderingContext2D_(canvasElement) { |
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this.m_ = createMatrixIdentity(); |
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|
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this.mStack_ = []; |
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this.aStack_ = []; |
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this.currentPath_ = []; |
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|
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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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|
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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.font = '10px sans-serif'; |
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this.textAlign = 'left'; |
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this.textBaseline = 'alphabetic'; |
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this.canvas = canvasElement; |
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|
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var cssText = 'width:' + canvasElement.clientWidth + 'px;height:' + |
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canvasElement.clientHeight + 'px;overflow:hidden;position:absolute'; |
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var el = canvasElement.ownerDocument.createElement('div'); |
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el.style.cssText = cssText; |
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canvasElement.appendChild(el); |
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|
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var overlayEl = el.cloneNode(false); |
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// Use a non transparent background. |
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overlayEl.style.backgroundColor = 'red'; |
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overlayEl.style.filter = 'alpha(opacity=0)'; |
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canvasElement.appendChild(overlayEl); |
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|
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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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|
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var contextPrototype = CanvasRenderingContext2D_.prototype; |
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contextPrototype.clearRect = function() { |
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if (this.textMeasureEl_) { |
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this.textMeasureEl_.removeNode(true); |
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this.textMeasureEl_ = null; |
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} |
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this.element_.innerHTML = ''; |
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}; |
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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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|
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contextPrototype.moveTo = function(aX, aY) { |
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var p = getCoords(this, 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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|
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contextPrototype.lineTo = function(aX, aY) { |
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var p = getCoords(this, aX, aY); |
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this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); |
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|
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this.currentX_ = p.x; |
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this.currentY_ = p.y; |
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}; |
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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 = getCoords(this, aX, aY); |
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var cp1 = getCoords(this, aCP1x, aCP1y); |
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var cp2 = getCoords(this, aCP2x, aCP2y); |
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bezierCurveTo(this, cp1, cp2, p); |
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}; |
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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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|
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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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|
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var cp = getCoords(this, aCPx, aCPy); |
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var p = getCoords(this, aX, aY); |
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|
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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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|
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bezierCurveTo(this, cp1, cp2, p); |
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}; |
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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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|
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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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|
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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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|
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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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|
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var p = getCoords(this, aX, aY); |
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var pStart = getCoords(this, xStart, yStart); |
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var pEnd = getCoords(this, xEnd, yEnd); |
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|
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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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}; |
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|
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contextPrototype.rect = function(aX, aY, aWidth, aHeight) { |
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this.moveTo(aX, aY); |
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this.lineTo(aX + aWidth, aY); |
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this.lineTo(aX + aWidth, aY + aHeight); |
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this.lineTo(aX, aY + aHeight); |
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this.closePath(); |
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}; |
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|
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contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { |
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var oldPath = this.currentPath_; |
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this.beginPath(); |
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|
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this.moveTo(aX, aY); |
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this.lineTo(aX + aWidth, aY); |
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this.lineTo(aX + aWidth, aY + aHeight); |
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this.lineTo(aX, aY + aHeight); |
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this.closePath(); |
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this.stroke(); |
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|
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this.currentPath_ = oldPath; |
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}; |
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|
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contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { |
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var oldPath = this.currentPath_; |
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this.beginPath(); |
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|
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this.moveTo(aX, aY); |
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this.lineTo(aX + aWidth, aY); |
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this.lineTo(aX + aWidth, aY + aHeight); |
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this.lineTo(aX, aY + aHeight); |
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this.closePath(); |
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this.fill(); |
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|
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this.currentPath_ = oldPath; |
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}; |
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|
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contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { |
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var gradient = new CanvasGradient_('gradient'); |
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gradient.x0_ = aX0; |
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gradient.y0_ = aY0; |
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gradient.x1_ = aX1; |
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gradient.y1_ = aY1; |
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return gradient; |
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}; |
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|
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contextPrototype.createRadialGradient = function(aX0, aY0, aR0, |
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aX1, aY1, aR1) { |
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var gradient = new CanvasGradient_('gradientradial'); |
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gradient.x0_ = aX0; |
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gradient.y0_ = aY0; |
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gradient.r0_ = aR0; |
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gradient.x1_ = aX1; |
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gradient.y1_ = aY1; |
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gradient.r1_ = aR1; |
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return gradient; |
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}; |
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|
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contextPrototype.drawImage = function(image, var_args) { |
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var dx, dy, dw, dh, sx, sy, sw, sh; |
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|
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// to find the original width we overide the width and height |
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var oldRuntimeWidth = image.runtimeStyle.width; |
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var oldRuntimeHeight = image.runtimeStyle.height; |
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image.runtimeStyle.width = 'auto'; |
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image.runtimeStyle.height = 'auto'; |
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|
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// get the original size |
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var w = image.width; |
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var h = image.height; |
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|
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// and remove overides |
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image.runtimeStyle.width = oldRuntimeWidth; |
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image.runtimeStyle.height = oldRuntimeHeight; |
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|
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if (arguments.length == 3) { |
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dx = arguments[1]; |
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dy = arguments[2]; |
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sx = sy = 0; |
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sw = dw = w; |
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sh = dh = h; |
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} else if (arguments.length == 5) { |
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dx = arguments[1]; |
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dy = arguments[2]; |
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dw = arguments[3]; |
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dh = arguments[4]; |
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sx = sy = 0; |
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sw = w; |
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sh = h; |
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} else if (arguments.length == 9) { |
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sx = arguments[1]; |
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sy = arguments[2]; |
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sw = arguments[3]; |
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sh = arguments[4]; |
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dx = arguments[5]; |
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dy = arguments[6]; |
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dw = arguments[7]; |
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dh = arguments[8]; |
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} else { |
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throw Error('Invalid number of arguments'); |
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} |
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|
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var d = getCoords(this, dx, dy); |
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|
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var w2 = sw / 2; |
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var h2 = sh / 2; |
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|
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var vmlStr = []; |
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|
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var W = 10; |
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var H = 10; |
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|
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// For some reason that I've now forgotten, using divs didn't work |
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vmlStr.push(' <g_vml_:group', |
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' coordsize="', Z * W, ',', Z * H, '"', |
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' coordorigin="0,0"' , |
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' style="width:', W, 'px;height:', H, 'px;position:absolute;'); |
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|
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// If filters are necessary (rotation exists), create them |
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// filters are bog-slow, so only create them if abbsolutely necessary |
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// The following check doesn't account for skews (which don't exist |
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// in the canvas spec (yet) anyway. |
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|
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if (this.m_[0][0] != 1 || this.m_[0][1] || |
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this.m_[1][1] != 1 || this.m_[1][0]) { |
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var filter = []; |
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|
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// Note the 12/21 reversal |
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filter.push('M11=', this.m_[0][0], ',', |
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'M12=', this.m_[1][0], ',', |
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'M21=', this.m_[0][1], ',', |
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'M22=', this.m_[1][1], ',', |
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'Dx=', mr(d.x / Z), ',', |
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'Dy=', mr(d.y / Z), ''); |
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|
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// Bounding box calculation (need to minimize displayed area so that |
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// filters don't waste time on unused pixels. |
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var max = d; |
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var c2 = getCoords(this, dx + dw, dy); |
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var c3 = getCoords(this, dx, dy + dh); |
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var c4 = getCoords(this, dx + dw, dy + dh); |
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|
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max.x = m.max(max.x, c2.x, c3.x, c4.x); |
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max.y = m.max(max.y, c2.y, c3.y, c4.y); |
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|
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vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), |
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'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', |
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filter.join(''), ", sizingmethod='clip');"); |
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|
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} else { |
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vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); |
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} |
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|
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vmlStr.push(' ">' , |
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'<g_vml_:image src="', image.src, '"', |
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' style="width:', Z * dw, 'px;', |
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' height:', Z * dh, 'px"', |
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' cropleft="', sx / w, '"', |
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' croptop="', sy / h, '"', |
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' cropright="', (w - sx - sw) / w, '"', |
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' cropbottom="', (h - sy - sh) / h, '"', |
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' />', |
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'</g_vml_:group>'); |
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|
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this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); |
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}; |
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|
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contextPrototype.stroke = function(aFill) { |
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var W = 10; |
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var H = 10; |
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// Divide the shape into chunks if it's too long because IE has a limit |
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// somewhere for how long a VML shape can be. This simple division does |
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// not work with fills, only strokes, unfortunately. |
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var chunkSize = 5000; |
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|
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var min = {x: null, y: null}; |
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var max = {x: null, y: null}; |
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|
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for (var j = 0; j < this.currentPath_.length; j += chunkSize) { |
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var lineStr = []; |
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var lineOpen = false; |
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|
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lineStr.push('<g_vml_:shape', |
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' filled="', !!aFill, '"', |
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' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
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' coordorigin="0,0"', |
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' coordsize="', Z * W, ',', Z * H, '"', |
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' stroked="', !aFill, '"', |
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' path="'); |
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|
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var newSeq = false; |
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|
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for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { |
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if (i % chunkSize == 0 && i > 0) { // move into position for next chunk |
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lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); |
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} |
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|
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var p = this.currentPath_[i]; |
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var c; |
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|
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switch (p.type) { |
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case 'moveTo': |
|
c = p; |
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lineStr.push(' m ', mr(p.x), ',', mr(p.y)); |
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break; |
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case 'lineTo': |
|
lineStr.push(' l ', mr(p.x), ',', mr(p.y)); |
|
break; |
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case 'close': |
|
lineStr.push(' x '); |
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p = null; |
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break; |
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case 'bezierCurveTo': |
|
lineStr.push(' c ', |
|
mr(p.cp1x), ',', mr(p.cp1y), ',', |
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mr(p.cp2x), ',', mr(p.cp2y), ',', |
|
mr(p.x), ',', mr(p.y)); |
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break; |
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case 'at': |
|
case 'wa': |
|
lineStr.push(' ', p.type, ' ', |
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mr(p.x - this.arcScaleX_ * p.radius), ',', |
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mr(p.y - this.arcScaleY_ * p.radius), ' ', |
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mr(p.x + this.arcScaleX_ * p.radius), ',', |
|
mr(p.y + this.arcScaleY_ * p.radius), ' ', |
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mr(p.xStart), ',', mr(p.yStart), ' ', |
|
mr(p.xEnd), ',', mr(p.yEnd)); |
|
break; |
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} |
|
|
|
|
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// TODO: Following is broken for curves due to |
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// move to proper paths. |
|
|
|
// Figure out dimensions so we can do gradient fills |
|
// properly |
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if (p) { |
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if (min.x == null || p.x < min.x) { |
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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; |
|
} |
|
} |
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} |
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lineStr.push(' ">'); |
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|
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if (!aFill) { |
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appendStroke(this, lineStr); |
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} else { |
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appendFill(this, lineStr, min, max); |
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} |
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|
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lineStr.push('</g_vml_:shape>'); |
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|
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this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
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} |
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}; |
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|
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function appendStroke(ctx, lineStr) { |
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var a = processStyle(ctx.strokeStyle); |
|
var color = a.color; |
|
var opacity = a.alpha * ctx.globalAlpha; |
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var lineWidth = ctx.lineScale_ * ctx.lineWidth; |
|
|
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// 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; |
|
} |
|
|
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lineStr.push( |
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'<g_vml_:stroke', |
|
' opacity="', opacity, '"', |
|
' joinstyle="', ctx.lineJoin, '"', |
|
' miterlimit="', ctx.miterLimit, '"', |
|
' endcap="', processLineCap(ctx.lineCap), '"', |
|
' weight="', lineWidth, 'px"', |
|
' color="', color, '" />' |
|
); |
|
} |
|
|
|
function appendFill(ctx, lineStr, min, max) { |
|
var fillStyle = ctx.fillStyle; |
|
var arcScaleX = ctx.arcScaleX_; |
|
var arcScaleY = ctx.arcScaleY_; |
|
var width = max.x - min.x; |
|
var height = max.y - min.y; |
|
if (fillStyle instanceof CanvasGradient_) { |
|
// TODO: Gradients transformed with the transformation matrix. |
|
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_ / arcScaleX; |
|
var y0 = fillStyle.y0_ / arcScaleY; |
|
var x1 = fillStyle.x1_ / arcScaleX; |
|
var y1 = fillStyle.y1_ / arcScaleY; |
|
var p0 = getCoords(ctx, x0, y0); |
|
var p1 = getCoords(ctx, 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 = getCoords(ctx, fillStyle.x0_, fillStyle.y0_); |
|
focus = { |
|
x: (p0.x - min.x) / width, |
|
y: (p0.y - min.y) / height |
|
}; |
|
|
|
width /= arcScaleX * Z; |
|
height /= 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 * ctx.globalAlpha; |
|
var opacity2 = stops[length - 1].alpha * ctx.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 if (fillStyle instanceof CanvasPattern_) { |
|
if (width && height) { |
|
var deltaLeft = -min.x; |
|
var deltaTop = -min.y; |
|
lineStr.push('<g_vml_:fill', |
|
' position="', |
|
deltaLeft / width * arcScaleX * arcScaleX, ',', |
|
deltaTop / height * arcScaleY * arcScaleY, '"', |
|
' type="tile"', |
|
// TODO: Figure out the correct size to fit the scale. |
|
//' size="', w, 'px ', h, 'px"', |
|
' src="', fillStyle.src_, '" />'); |
|
} |
|
} else { |
|
var a = processStyle(ctx.fillStyle); |
|
var color = a.color; |
|
var opacity = a.alpha * ctx.globalAlpha; |
|
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, |
|
'" />'); |
|
} |
|
} |
|
|
|
contextPrototype.fill = function() { |
|
this.stroke(true); |
|
}; |
|
|
|
contextPrototype.closePath = function() { |
|
this.currentPath_.push({type: 'close'}); |
|
}; |
|
|
|
function getCoords(ctx, aX, aY) { |
|
var m = ctx.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() { |
|
if (this.aStack_.length) { |
|
copyState(this.aStack_.pop(), this); |
|
this.m_ = this.mStack_.pop(); |
|
} |
|
}; |
|
|
|
function matrixIsFinite(m) { |
|
return isFinite(m[0][0]) && isFinite(m[0][1]) && |
|
isFinite(m[1][0]) && isFinite(m[1][1]) && |
|
isFinite(m[2][0]) && isFinite(m[2][1]); |
|
} |
|
|
|
function setM(ctx, m, updateLineScale) { |
|
if (!matrixIsFinite(m)) { |
|
return; |
|
} |
|
ctx.m_ = m; |
|
|
|
if (updateLineScale) { |
|
// 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]; |
|
ctx.lineScale_ = sqrt(abs(det)); |
|
} |
|
} |
|
|
|
contextPrototype.translate = function(aX, aY) { |
|
var m1 = [ |
|
[1, 0, 0], |
|
[0, 1, 0], |
|
[aX, aY, 1] |
|
]; |
|
|
|
setM(this, matrixMultiply(m1, this.m_), false); |
|
}; |
|
|
|
contextPrototype.rotate = function(aRot) { |
|
var c = mc(aRot); |
|
var s = ms(aRot); |
|
|
|
var m1 = [ |
|
[c, s, 0], |
|
[-s, c, 0], |
|
[0, 0, 1] |
|
]; |
|
|
|
setM(this, matrixMultiply(m1, this.m_), false); |
|
}; |
|
|
|
contextPrototype.scale = function(aX, aY) { |
|
this.arcScaleX_ *= aX; |
|
this.arcScaleY_ *= aY; |
|
var m1 = [ |
|
[aX, 0, 0], |
|
[0, aY, 0], |
|
[0, 0, 1] |
|
]; |
|
|
|
setM(this, matrixMultiply(m1, this.m_), true); |
|
}; |
|
|
|
contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { |
|
var m1 = [ |
|
[m11, m12, 0], |
|
[m21, m22, 0], |
|
[dx, dy, 1] |
|
]; |
|
|
|
setM(this, matrixMultiply(m1, this.m_), true); |
|
}; |
|
|
|
contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { |
|
var m = [ |
|
[m11, m12, 0], |
|
[m21, m22, 0], |
|
[dx, dy, 1] |
|
]; |
|
|
|
setM(this, m, true); |
|
}; |
|
|
|
/** |
|
* The text drawing function. |
|
* The maxWidth argument isn't taken in account, since no browser supports |
|
* it yet. |
|
*/ |
|
contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { |
|
var m = this.m_, |
|
delta = 1000, |
|
left = 0, |
|
right = delta, |
|
offset = {x: 0, y: 0}, |
|
lineStr = []; |
|
|
|
var fontStyle = getComputedStyle(processFontStyle(this.font), |
|
this.element_); |
|
|
|
var fontStyleString = buildStyle(fontStyle); |
|
|
|
var elementStyle = this.element_.currentStyle; |
|
var textAlign = this.textAlign.toLowerCase(); |
|
switch (textAlign) { |
|
case 'left': |
|
case 'center': |
|
case 'right': |
|
break; |
|
case 'end': |
|
textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; |
|
break; |
|
case 'start': |
|
textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; |
|
break; |
|
default: |
|
textAlign = 'left'; |
|
} |
|
|
|
// 1.75 is an arbitrary number, as there is no info about the text baseline |
|
switch (this.textBaseline) { |
|
case 'hanging': |
|
case 'top': |
|
offset.y = fontStyle.size / 1.75; |
|
break; |
|
case 'middle': |
|
break; |
|
default: |
|
case null: |
|
case 'alphabetic': |
|
case 'ideographic': |
|
case 'bottom': |
|
offset.y = -fontStyle.size / 2.25; |
|
break; |
|
} |
|
|
|
switch(textAlign) { |
|
case 'right': |
|
left = delta; |
|
right = 0.05; |
|
break; |
|
case 'center': |
|
left = right = delta / 2; |
|
break; |
|
} |
|
|
|
var d = getCoords(this, x + offset.x, y + offset.y); |
|
|
|
lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', |
|
' coordsize="100 100" coordorigin="0 0"', |
|
' filled="', !stroke, '" stroked="', !!stroke, |
|
'" style="position:absolute;width:1px;height:1px;">'); |
|
|
|
if (stroke) { |
|
appendStroke(this, lineStr); |
|
} else { |
|
// TODO: Fix the min and max params. |
|
appendFill(this, lineStr, {x: -left, y: 0}, |
|
{x: right, y: fontStyle.size}); |
|
} |
|
|
|
var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + |
|
m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; |
|
|
|
var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); |
|
|
|
lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', |
|
' offset="', skewOffset, '" origin="', left ,' 0" />', |
|
'<g_vml_:path textpathok="true" />', |
|
'<g_vml_:textpath on="true" string="', |
|
encodeHtmlAttribute(text), |
|
'" style="v-text-align:', textAlign, |
|
';font:', encodeHtmlAttribute(fontStyleString), |
|
'" /></g_vml_:line>'); |
|
|
|
this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
|
}; |
|
|
|
contextPrototype.fillText = function(text, x, y, maxWidth) { |
|
this.drawText_(text, x, y, maxWidth, false); |
|
}; |
|
|
|
contextPrototype.strokeText = function(text, x, y, maxWidth) { |
|
this.drawText_(text, x, y, maxWidth, true); |
|
}; |
|
|
|
contextPrototype.measureText = function(text) { |
|
if (!this.textMeasureEl_) { |
|
var s = '<span style="position:absolute;' + |
|
'top:-20000px;left:0;padding:0;margin:0;border:none;' + |
|
'white-space:pre;"></span>'; |
|
this.element_.insertAdjacentHTML('beforeEnd', s); |
|
this.textMeasureEl_ = this.element_.lastChild; |
|
} |
|
var doc = this.element_.ownerDocument; |
|
this.textMeasureEl_.innerHTML = ''; |
|
this.textMeasureEl_.style.font = this.font; |
|
// Don't use innerHTML or innerText because they allow markup/whitespace. |
|
this.textMeasureEl_.appendChild(doc.createTextNode(text)); |
|
return {width: this.textMeasureEl_.offsetWidth}; |
|
}; |
|
|
|
/******** STUBS ********/ |
|
contextPrototype.clip = function() { |
|
// TODO: Implement |
|
}; |
|
|
|
contextPrototype.arcTo = function() { |
|
// TODO: Implement |
|
}; |
|
|
|
contextPrototype.createPattern = function(image, repetition) { |
|
return new CanvasPattern_(image, repetition); |
|
}; |
|
|
|
// 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_(image, repetition) { |
|
assertImageIsValid(image); |
|
switch (repetition) { |
|
case 'repeat': |
|
case null: |
|
case '': |
|
this.repetition_ = 'repeat'; |
|
break |
|
case 'repeat-x': |
|
case 'repeat-y': |
|
case 'no-repeat': |
|
this.repetition_ = repetition; |
|
break; |
|
default: |
|
throwException('SYNTAX_ERR'); |
|
} |
|
|
|
this.src_ = image.src; |
|
this.width_ = image.width; |
|
this.height_ = image.height; |
|
} |
|
|
|
function throwException(s) { |
|
throw new DOMException_(s); |
|
} |
|
|
|
function assertImageIsValid(img) { |
|
if (!img || img.nodeType != 1 || img.tagName != 'IMG') { |
|
throwException('TYPE_MISMATCH_ERR'); |
|
} |
|
if (img.readyState != 'complete') { |
|
throwException('INVALID_STATE_ERR'); |
|
} |
|
} |
|
|
|
function DOMException_(s) { |
|
this.code = this[s]; |
|
this.message = s +': DOM Exception ' + this.code; |
|
} |
|
var p = DOMException_.prototype = new Error; |
|
p.INDEX_SIZE_ERR = 1; |
|
p.DOMSTRING_SIZE_ERR = 2; |
|
p.HIERARCHY_REQUEST_ERR = 3; |
|
p.WRONG_DOCUMENT_ERR = 4; |
|
p.INVALID_CHARACTER_ERR = 5; |
|
p.NO_DATA_ALLOWED_ERR = 6; |
|
p.NO_MODIFICATION_ALLOWED_ERR = 7; |
|
p.NOT_FOUND_ERR = 8; |
|
p.NOT_SUPPORTED_ERR = 9; |
|
p.INUSE_ATTRIBUTE_ERR = 10; |
|
p.INVALID_STATE_ERR = 11; |
|
p.SYNTAX_ERR = 12; |
|
p.INVALID_MODIFICATION_ERR = 13; |
|
p.NAMESPACE_ERR = 14; |
|
p.INVALID_ACCESS_ERR = 15; |
|
p.VALIDATION_ERR = 16; |
|
p.TYPE_MISMATCH_ERR = 17; |
|
|
|
// set up externs |
|
G_vmlCanvasManager = G_vmlCanvasManager_; |
|
CanvasRenderingContext2D = CanvasRenderingContext2D_; |
|
CanvasGradient = CanvasGradient_; |
|
CanvasPattern = CanvasPattern_; |
|
DOMException = DOMException_; |
|
})(); |
|
|
|
} // if
|
|
|