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@@ -0,0 +1,1427 @@
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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);
|
|
|
+ var end = styleString.indexOf(')', start + 1);
|
|
|
+ var parts = styleString.substring(start + 1, end).split(',');
|
|
|
+ // add alpha if needed
|
|
|
+ if (parts.length == 4 && styleString.substr(3, 1) == 'a') {
|
|
|
+ alpha = Number(parts[3]);
|
|
|
+ } else {
|
|
|
+ parts[3] = 1;
|
|
|
+ }
|
|
|
+ return parts;
|
|
|
+ }
|
|
|
+
|
|
|
+ function percent(s) {
|
|
|
+ return parseFloat(s) / 100;
|
|
|
+ }
|
|
|
+
|
|
|
+ function clamp(v, min, max) {
|
|
|
+ return Math.min(max, Math.max(min, v));
|
|
|
+ }
|
|
|
+
|
|
|
+ function hslToRgb(parts){
|
|
|
+ var r, g, b;
|
|
|
+ h = parseFloat(parts[0]) / 360 % 360;
|
|
|
+ if (h < 0)
|
|
|
+ h++;
|
|
|
+ s = clamp(percent(parts[1]), 0, 1);
|
|
|
+ l = clamp(percent(parts[2]), 0, 1);
|
|
|
+ if (s == 0) {
|
|
|
+ r = g = b = l; // achromatic
|
|
|
+ } else {
|
|
|
+ var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
|
|
|
+ var p = 2 * l - q;
|
|
|
+ r = hueToRgb(p, q, h + 1 / 3);
|
|
|
+ g = hueToRgb(p, q, h);
|
|
|
+ b = hueToRgb(p, q, h - 1 / 3);
|
|
|
+ }
|
|
|
+
|
|
|
+ return '#' + decToHex[Math.floor(r * 255)] +
|
|
|
+ decToHex[Math.floor(g * 255)] +
|
|
|
+ decToHex[Math.floor(b * 255)];
|
|
|
+ }
|
|
|
+
|
|
|
+ function hueToRgb(m1, m2, h) {
|
|
|
+ if (h < 0)
|
|
|
+ h++;
|
|
|
+ if (h > 1)
|
|
|
+ h--;
|
|
|
+
|
|
|
+ if (6 * h < 1)
|
|
|
+ return m1 + (m2 - m1) * 6 * h;
|
|
|
+ else if (2 * h < 1)
|
|
|
+ return m2;
|
|
|
+ else if (3 * h < 2)
|
|
|
+ return m1 + (m2 - m1) * (2 / 3 - h) * 6;
|
|
|
+ else
|
|
|
+ return m1;
|
|
|
+ }
|
|
|
+
|
|
|
+ function processStyle(styleString) {
|
|
|
+ var str, alpha = 1;
|
|
|
+
|
|
|
+ styleString = String(styleString);
|
|
|
+ if (styleString.charAt(0) == '#') {
|
|
|
+ str = styleString;
|
|
|
+ } else if (/^rgb/.test(styleString)) {
|
|
|
+ var parts = getRgbHslContent(styleString);
|
|
|
+ var str = '#', n;
|
|
|
+ for (var i = 0; i < 3; i++) {
|
|
|
+ if (parts[i].indexOf('%') != -1) {
|
|
|
+ n = Math.floor(percent(parts[i]) * 255);
|
|
|
+ } else {
|
|
|
+ n = Number(parts[i]);
|
|
|
+ }
|
|
|
+ str += decToHex[clamp(n, 0, 255)];
|
|
|
+ }
|
|
|
+ alpha = parts[3];
|
|
|
+ } else if (/^hsl/.test(styleString)) {
|
|
|
+ var parts = getRgbHslContent(styleString);
|
|
|
+ str = hslToRgb(parts);
|
|
|
+ alpha = parts[3];
|
|
|
+ } else {
|
|
|
+ str = colorData[styleString] || styleString;
|
|
|
+ }
|
|
|
+ return {color: str, alpha: alpha};
|
|
|
+ }
|
|
|
+
|
|
|
+ var DEFAULT_STYLE = {
|
|
|
+ style: 'normal',
|
|
|
+ variant: 'normal',
|
|
|
+ weight: 'normal',
|
|
|
+ size: 10,
|
|
|
+ family: 'sans-serif'
|
|
|
+ };
|
|
|
+
|
|
|
+ // Internal text style cache
|
|
|
+ var fontStyleCache = {};
|
|
|
+
|
|
|
+ function processFontStyle(styleString) {
|
|
|
+ if (fontStyleCache[styleString]) {
|
|
|
+ return fontStyleCache[styleString];
|
|
|
+ }
|
|
|
+
|
|
|
+ var el = document.createElement('div');
|
|
|
+ var style = el.style;
|
|
|
+ try {
|
|
|
+ style.font = styleString;
|
|
|
+ } catch (ex) {
|
|
|
+ // Ignore failures to set to invalid font.
|
|
|
+ }
|
|
|
+
|
|
|
+ return fontStyleCache[styleString] = {
|
|
|
+ style: style.fontStyle || DEFAULT_STYLE.style,
|
|
|
+ variant: style.fontVariant || DEFAULT_STYLE.variant,
|
|
|
+ weight: style.fontWeight || DEFAULT_STYLE.weight,
|
|
|
+ size: style.fontSize || DEFAULT_STYLE.size,
|
|
|
+ family: style.fontFamily || DEFAULT_STYLE.family
|
|
|
+ };
|
|
|
+ }
|
|
|
+
|
|
|
+ function getComputedStyle(style, element) {
|
|
|
+ var computedStyle = {};
|
|
|
+
|
|
|
+ for (var p in style) {
|
|
|
+ computedStyle[p] = style[p];
|
|
|
+ }
|
|
|
+
|
|
|
+ // Compute the size
|
|
|
+ var canvasFontSize = parseFloat(element.currentStyle.fontSize),
|
|
|
+ fontSize = parseFloat(style.size);
|
|
|
+
|
|
|
+ if (typeof style.size == 'number') {
|
|
|
+ computedStyle.size = style.size;
|
|
|
+ } else if (style.size.indexOf('px') != -1) {
|
|
|
+ computedStyle.size = fontSize;
|
|
|
+ } else if (style.size.indexOf('em') != -1) {
|
|
|
+ computedStyle.size = canvasFontSize * fontSize;
|
|
|
+ } else if(style.size.indexOf('%') != -1) {
|
|
|
+ computedStyle.size = (canvasFontSize / 100) * fontSize;
|
|
|
+ } else if (style.size.indexOf('pt') != -1) {
|
|
|
+ computedStyle.size = fontSize / .75;
|
|
|
+ } else {
|
|
|
+ computedStyle.size = canvasFontSize;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Different scaling between normal text and VML text. This was found using
|
|
|
+ // trial and error to get the same size as non VML text.
|
|
|
+ computedStyle.size *= 0.981;
|
|
|
+
|
|
|
+ return computedStyle;
|
|
|
+ }
|
|
|
+
|
|
|
+ function buildStyle(style) {
|
|
|
+ return style.style + ' ' + style.variant + ' ' + style.weight + ' ' +
|
|
|
+ style.size + 'px ' + style.family;
|
|
|
+ }
|
|
|
+
|
|
|
+ function processLineCap(lineCap) {
|
|
|
+ switch (lineCap) {
|
|
|
+ case 'butt':
|
|
|
+ return 'flat';
|
|
|
+ case 'round':
|
|
|
+ return 'round';
|
|
|
+ case 'square':
|
|
|
+ default:
|
|
|
+ return 'square';
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * This class implements CanvasRenderingContext2D interface as described by
|
|
|
+ * the WHATWG.
|
|
|
+ * @param {HTMLElement} surfaceElement The element that the 2D context should
|
|
|
+ * be associated with
|
|
|
+ */
|
|
|
+ function CanvasRenderingContext2D_(surfaceElement) {
|
|
|
+ this.m_ = createMatrixIdentity();
|
|
|
+
|
|
|
+ this.mStack_ = [];
|
|
|
+ this.aStack_ = [];
|
|
|
+ this.currentPath_ = [];
|
|
|
+
|
|
|
+ // Canvas context properties
|
|
|
+ this.strokeStyle = '#000';
|
|
|
+ this.fillStyle = '#000';
|
|
|
+
|
|
|
+ this.lineWidth = 1;
|
|
|
+ this.lineJoin = 'miter';
|
|
|
+ this.lineCap = 'butt';
|
|
|
+ this.miterLimit = Z * 1;
|
|
|
+ this.globalAlpha = 1;
|
|
|
+ this.font = '10px sans-serif';
|
|
|
+ this.textAlign = 'left';
|
|
|
+ this.textBaseline = 'alphabetic';
|
|
|
+ this.canvas = surfaceElement;
|
|
|
+
|
|
|
+ var el = surfaceElement.ownerDocument.createElement('div');
|
|
|
+ el.style.width = surfaceElement.clientWidth + 'px';
|
|
|
+ el.style.height = surfaceElement.clientHeight + 'px';
|
|
|
+ el.style.overflow = 'hidden';
|
|
|
+ el.style.position = 'absolute';
|
|
|
+ surfaceElement.appendChild(el);
|
|
|
+
|
|
|
+ this.element_ = el;
|
|
|
+ this.arcScaleX_ = 1;
|
|
|
+ this.arcScaleY_ = 1;
|
|
|
+ this.lineScale_ = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ var contextPrototype = CanvasRenderingContext2D_.prototype;
|
|
|
+ contextPrototype.clearRect = function() {
|
|
|
+ if (this.textMeasureEl_) {
|
|
|
+ this.textMeasureEl_.removeNode(true);
|
|
|
+ this.textMeasureEl_ = null;
|
|
|
+ }
|
|
|
+ this.element_.innerHTML = '';
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.beginPath = function() {
|
|
|
+ // TODO: Branch current matrix so that save/restore has no effect
|
|
|
+ // as per safari docs.
|
|
|
+ this.currentPath_ = [];
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.moveTo = function(aX, aY) {
|
|
|
+ var p = this.getCoords_(aX, aY);
|
|
|
+ this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y});
|
|
|
+ this.currentX_ = p.x;
|
|
|
+ this.currentY_ = p.y;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.lineTo = function(aX, aY) {
|
|
|
+ var p = this.getCoords_(aX, aY);
|
|
|
+ this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y});
|
|
|
+
|
|
|
+ this.currentX_ = p.x;
|
|
|
+ this.currentY_ = p.y;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
|
|
|
+ aCP2x, aCP2y,
|
|
|
+ aX, aY) {
|
|
|
+ var p = this.getCoords_(aX, aY);
|
|
|
+ var cp1 = this.getCoords_(aCP1x, aCP1y);
|
|
|
+ var cp2 = this.getCoords_(aCP2x, aCP2y);
|
|
|
+ bezierCurveTo(this, cp1, cp2, p);
|
|
|
+ };
|
|
|
+
|
|
|
+ // Helper function that takes the already fixed cordinates.
|
|
|
+ function bezierCurveTo(self, cp1, cp2, p) {
|
|
|
+ self.currentPath_.push({
|
|
|
+ type: 'bezierCurveTo',
|
|
|
+ cp1x: cp1.x,
|
|
|
+ cp1y: cp1.y,
|
|
|
+ cp2x: cp2.x,
|
|
|
+ cp2y: cp2.y,
|
|
|
+ x: p.x,
|
|
|
+ y: p.y
|
|
|
+ });
|
|
|
+ self.currentX_ = p.x;
|
|
|
+ self.currentY_ = p.y;
|
|
|
+ }
|
|
|
+
|
|
|
+ contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
|
|
|
+ // the following is lifted almost directly from
|
|
|
+ // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
|
|
|
+
|
|
|
+ var cp = this.getCoords_(aCPx, aCPy);
|
|
|
+ var p = this.getCoords_(aX, aY);
|
|
|
+
|
|
|
+ var cp1 = {
|
|
|
+ x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_),
|
|
|
+ y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_)
|
|
|
+ };
|
|
|
+ var cp2 = {
|
|
|
+ x: cp1.x + (p.x - this.currentX_) / 3.0,
|
|
|
+ y: cp1.y + (p.y - this.currentY_) / 3.0
|
|
|
+ };
|
|
|
+
|
|
|
+ bezierCurveTo(this, cp1, cp2, p);
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.arc = function(aX, aY, aRadius,
|
|
|
+ aStartAngle, aEndAngle, aClockwise) {
|
|
|
+ aRadius *= Z;
|
|
|
+ var arcType = aClockwise ? 'at' : 'wa';
|
|
|
+
|
|
|
+ var xStart = aX + mc(aStartAngle) * aRadius - Z2;
|
|
|
+ var yStart = aY + ms(aStartAngle) * aRadius - Z2;
|
|
|
+
|
|
|
+ var xEnd = aX + mc(aEndAngle) * aRadius - Z2;
|
|
|
+ var yEnd = aY + ms(aEndAngle) * aRadius - Z2;
|
|
|
+
|
|
|
+ // IE won't render arches drawn counter clockwise if xStart == xEnd.
|
|
|
+ if (xStart == xEnd && !aClockwise) {
|
|
|
+ xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
|
|
|
+ // that can be represented in binary
|
|
|
+ }
|
|
|
+
|
|
|
+ var p = this.getCoords_(aX, aY);
|
|
|
+ var pStart = this.getCoords_(xStart, yStart);
|
|
|
+ var pEnd = this.getCoords_(xEnd, yEnd);
|
|
|
+
|
|
|
+ this.currentPath_.push({type: arcType,
|
|
|
+ x: p.x,
|
|
|
+ y: p.y,
|
|
|
+ radius: aRadius,
|
|
|
+ xStart: pStart.x,
|
|
|
+ yStart: pStart.y,
|
|
|
+ xEnd: pEnd.x,
|
|
|
+ yEnd: pEnd.y});
|
|
|
+
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
|
|
|
+ this.moveTo(aX, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
+ this.lineTo(aX, aY + aHeight);
|
|
|
+ this.closePath();
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
|
|
|
+ var oldPath = this.currentPath_;
|
|
|
+ this.beginPath();
|
|
|
+
|
|
|
+ this.moveTo(aX, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
+ this.lineTo(aX, aY + aHeight);
|
|
|
+ this.closePath();
|
|
|
+ this.stroke();
|
|
|
+
|
|
|
+ this.currentPath_ = oldPath;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
|
|
|
+ var oldPath = this.currentPath_;
|
|
|
+ this.beginPath();
|
|
|
+
|
|
|
+ this.moveTo(aX, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY);
|
|
|
+ this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
+ this.lineTo(aX, aY + aHeight);
|
|
|
+ this.closePath();
|
|
|
+ this.fill();
|
|
|
+
|
|
|
+ this.currentPath_ = oldPath;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
|
|
|
+ var gradient = new CanvasGradient_('gradient');
|
|
|
+ gradient.x0_ = aX0;
|
|
|
+ gradient.y0_ = aY0;
|
|
|
+ gradient.x1_ = aX1;
|
|
|
+ gradient.y1_ = aY1;
|
|
|
+ return gradient;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.createRadialGradient = function(aX0, aY0, aR0,
|
|
|
+ aX1, aY1, aR1) {
|
|
|
+ var gradient = new CanvasGradient_('gradientradial');
|
|
|
+ gradient.x0_ = aX0;
|
|
|
+ gradient.y0_ = aY0;
|
|
|
+ gradient.r0_ = aR0;
|
|
|
+ gradient.x1_ = aX1;
|
|
|
+ gradient.y1_ = aY1;
|
|
|
+ gradient.r1_ = aR1;
|
|
|
+ return gradient;
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.drawImage = function(image, var_args) {
|
|
|
+ var dx, dy, dw, dh, sx, sy, sw, sh;
|
|
|
+
|
|
|
+ // to find the original width we overide the width and height
|
|
|
+ var oldRuntimeWidth = image.runtimeStyle.width;
|
|
|
+ var oldRuntimeHeight = image.runtimeStyle.height;
|
|
|
+ image.runtimeStyle.width = 'auto';
|
|
|
+ image.runtimeStyle.height = 'auto';
|
|
|
+
|
|
|
+ // get the original size
|
|
|
+ var w = image.width;
|
|
|
+ var h = image.height;
|
|
|
+
|
|
|
+ // and remove overides
|
|
|
+ image.runtimeStyle.width = oldRuntimeWidth;
|
|
|
+ image.runtimeStyle.height = oldRuntimeHeight;
|
|
|
+
|
|
|
+ if (arguments.length == 3) {
|
|
|
+ dx = arguments[1];
|
|
|
+ dy = arguments[2];
|
|
|
+ sx = sy = 0;
|
|
|
+ sw = dw = w;
|
|
|
+ sh = dh = h;
|
|
|
+ } else if (arguments.length == 5) {
|
|
|
+ dx = arguments[1];
|
|
|
+ dy = arguments[2];
|
|
|
+ dw = arguments[3];
|
|
|
+ dh = arguments[4];
|
|
|
+ sx = sy = 0;
|
|
|
+ sw = w;
|
|
|
+ sh = h;
|
|
|
+ } else if (arguments.length == 9) {
|
|
|
+ sx = arguments[1];
|
|
|
+ sy = arguments[2];
|
|
|
+ sw = arguments[3];
|
|
|
+ sh = arguments[4];
|
|
|
+ dx = arguments[5];
|
|
|
+ dy = arguments[6];
|
|
|
+ dw = arguments[7];
|
|
|
+ dh = arguments[8];
|
|
|
+ } else {
|
|
|
+ throw Error('Invalid number of arguments');
|
|
|
+ }
|
|
|
+
|
|
|
+ var d = this.getCoords_(dx, dy);
|
|
|
+
|
|
|
+ var w2 = sw / 2;
|
|
|
+ var h2 = sh / 2;
|
|
|
+
|
|
|
+ var vmlStr = [];
|
|
|
+
|
|
|
+ var W = 10;
|
|
|
+ var H = 10;
|
|
|
+
|
|
|
+ // For some reason that I've now forgotten, using divs didn't work
|
|
|
+ vmlStr.push(' <g_vml_:group',
|
|
|
+ ' coordsize="', Z * W, ',', Z * H, '"',
|
|
|
+ ' coordorigin="0,0"' ,
|
|
|
+ ' style="width:', W, 'px;height:', H, 'px;position:absolute;');
|
|
|
+
|
|
|
+ // If filters are necessary (rotation exists), create them
|
|
|
+ // filters are bog-slow, so only create them if abbsolutely necessary
|
|
|
+ // The following check doesn't account for skews (which don't exist
|
|
|
+ // in the canvas spec (yet) anyway.
|
|
|
+
|
|
|
+ if (this.m_[0][0] != 1 || this.m_[0][1] ||
|
|
|
+ this.m_[1][1] != 1 || this.m_[1][0]) {
|
|
|
+ var filter = [];
|
|
|
+
|
|
|
+ // Note the 12/21 reversal
|
|
|
+ filter.push('M11=', this.m_[0][0], ',',
|
|
|
+ 'M12=', this.m_[1][0], ',',
|
|
|
+ 'M21=', this.m_[0][1], ',',
|
|
|
+ 'M22=', this.m_[1][1], ',',
|
|
|
+ 'Dx=', mr(d.x / Z), ',',
|
|
|
+ 'Dy=', mr(d.y / Z), '');
|
|
|
+
|
|
|
+ // Bounding box calculation (need to minimize displayed area so that
|
|
|
+ // filters don't waste time on unused pixels.
|
|
|
+ var max = d;
|
|
|
+ var c2 = this.getCoords_(dx + dw, dy);
|
|
|
+ var c3 = this.getCoords_(dx, dy + dh);
|
|
|
+ var c4 = this.getCoords_(dx + dw, dy + dh);
|
|
|
+
|
|
|
+ max.x = m.max(max.x, c2.x, c3.x, c4.x);
|
|
|
+ max.y = m.max(max.y, c2.y, c3.y, c4.y);
|
|
|
+
|
|
|
+ vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z),
|
|
|
+ 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
|
|
|
+ filter.join(''), ", sizingmethod='clip');");
|
|
|
+
|
|
|
+ } else {
|
|
|
+ vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;');
|
|
|
+ }
|
|
|
+
|
|
|
+ vmlStr.push(' ">' ,
|
|
|
+ '<g_vml_:image src="', image.src, '"',
|
|
|
+ ' style="width:', Z * dw, 'px;',
|
|
|
+ ' height:', Z * dh, 'px"',
|
|
|
+ ' cropleft="', sx / w, '"',
|
|
|
+ ' croptop="', sy / h, '"',
|
|
|
+ ' cropright="', (w - sx - sw) / w, '"',
|
|
|
+ ' cropbottom="', (h - sy - sh) / h, '"',
|
|
|
+ ' />',
|
|
|
+ '</g_vml_:group>');
|
|
|
+
|
|
|
+ this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join(''));
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.stroke = function(aFill) {
|
|
|
+ var W = 10;
|
|
|
+ var H = 10;
|
|
|
+ // Divide the shape into chunks if it's too long because IE has a limit
|
|
|
+ // somewhere for how long a VML shape can be. This simple division does
|
|
|
+ // not work with fills, only strokes, unfortunately.
|
|
|
+ var chunkSize = 5000;
|
|
|
+
|
|
|
+ var min = {x: null, y: null};
|
|
|
+ var max = {x: null, y: null};
|
|
|
+
|
|
|
+ for (var j = 0; j < this.currentPath_.length; j += chunkSize) {
|
|
|
+ var lineStr = [];
|
|
|
+ var lineOpen = false;
|
|
|
+
|
|
|
+ lineStr.push('<g_vml_:shape',
|
|
|
+ ' filled="', !!aFill, '"',
|
|
|
+ ' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
|
|
|
+ ' coordorigin="0,0"',
|
|
|
+ ' coordsize="', Z * W, ',', Z * H, '"',
|
|
|
+ ' stroked="', !aFill, '"',
|
|
|
+ ' path="');
|
|
|
+
|
|
|
+ var newSeq = false;
|
|
|
+
|
|
|
+ for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) {
|
|
|
+ if (i % chunkSize == 0 && i > 0) { // move into position for next chunk
|
|
|
+ lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y));
|
|
|
+ }
|
|
|
+
|
|
|
+ var p = this.currentPath_[i];
|
|
|
+ var c;
|
|
|
+
|
|
|
+ switch (p.type) {
|
|
|
+ case 'moveTo':
|
|
|
+ c = p;
|
|
|
+ lineStr.push(' m ', mr(p.x), ',', mr(p.y));
|
|
|
+ break;
|
|
|
+ case 'lineTo':
|
|
|
+ lineStr.push(' l ', mr(p.x), ',', mr(p.y));
|
|
|
+ break;
|
|
|
+ case 'close':
|
|
|
+ lineStr.push(' x ');
|
|
|
+ p = null;
|
|
|
+ break;
|
|
|
+ case 'bezierCurveTo':
|
|
|
+ lineStr.push(' c ',
|
|
|
+ mr(p.cp1x), ',', mr(p.cp1y), ',',
|
|
|
+ mr(p.cp2x), ',', mr(p.cp2y), ',',
|
|
|
+ mr(p.x), ',', mr(p.y));
|
|
|
+ break;
|
|
|
+ case 'at':
|
|
|
+ case 'wa':
|
|
|
+ lineStr.push(' ', p.type, ' ',
|
|
|
+ mr(p.x - this.arcScaleX_ * p.radius), ',',
|
|
|
+ mr(p.y - this.arcScaleY_ * p.radius), ' ',
|
|
|
+ mr(p.x + this.arcScaleX_ * p.radius), ',',
|
|
|
+ mr(p.y + this.arcScaleY_ * p.radius), ' ',
|
|
|
+ mr(p.xStart), ',', mr(p.yStart), ' ',
|
|
|
+ mr(p.xEnd), ',', mr(p.yEnd));
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
+ // TODO: Following is broken for curves due to
|
|
|
+ // move to proper paths.
|
|
|
+
|
|
|
+ // Figure out dimensions so we can do gradient fills
|
|
|
+ // properly
|
|
|
+ if (p) {
|
|
|
+ if (min.x == null || p.x < min.x) {
|
|
|
+ min.x = p.x;
|
|
|
+ }
|
|
|
+ if (max.x == null || p.x > max.x) {
|
|
|
+ max.x = p.x;
|
|
|
+ }
|
|
|
+ if (min.y == null || p.y < min.y) {
|
|
|
+ min.y = p.y;
|
|
|
+ }
|
|
|
+ if (max.y == null || p.y > max.y) {
|
|
|
+ max.y = p.y;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ lineStr.push(' ">');
|
|
|
+
|
|
|
+ if (!aFill) {
|
|
|
+ appendStroke(this, lineStr);
|
|
|
+ } else {
|
|
|
+ appendFill(this, lineStr, min, max);
|
|
|
+ }
|
|
|
+
|
|
|
+ lineStr.push('</g_vml_:shape>');
|
|
|
+
|
|
|
+ this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ function appendStroke(ctx, lineStr) {
|
|
|
+ var a = processStyle(ctx.strokeStyle);
|
|
|
+ var color = a.color;
|
|
|
+ var opacity = a.alpha * ctx.globalAlpha;
|
|
|
+ var lineWidth = ctx.lineScale_ * ctx.lineWidth;
|
|
|
+
|
|
|
+ // VML cannot correctly render a line if the width is less than 1px.
|
|
|
+ // In that case, we dilute the color to make the line look thinner.
|
|
|
+ if (lineWidth < 1) {
|
|
|
+ opacity *= lineWidth;
|
|
|
+ }
|
|
|
+
|
|
|
+ lineStr.push(
|
|
|
+ '<g_vml_:stroke',
|
|
|
+ ' opacity="', opacity, '"',
|
|
|
+ ' joinstyle="', 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 = ctx.getCoords_(x0, y0);
|
|
|
+ var p1 = ctx.getCoords_(x1, y1);
|
|
|
+ var dx = p1.x - p0.x;
|
|
|
+ var dy = p1.y - p0.y;
|
|
|
+ angle = Math.atan2(dx, dy) * 180 / Math.PI;
|
|
|
+
|
|
|
+ // The angle should be a non-negative number.
|
|
|
+ if (angle < 0) {
|
|
|
+ angle += 360;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Very small angles produce an unexpected result because they are
|
|
|
+ // converted to a scientific notation string.
|
|
|
+ if (angle < 1e-6) {
|
|
|
+ angle = 0;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ var p0 = ctx.getCoords_(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'});
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @private
|
|
|
+ */
|
|
|
+ contextPrototype.getCoords_ = function(aX, aY) {
|
|
|
+ var m = this.m_;
|
|
|
+ return {
|
|
|
+ x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2,
|
|
|
+ y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2
|
|
|
+ };
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.save = function() {
|
|
|
+ var o = {};
|
|
|
+ copyState(this, o);
|
|
|
+ this.aStack_.push(o);
|
|
|
+ this.mStack_.push(this.m_);
|
|
|
+ this.m_ = matrixMultiply(createMatrixIdentity(), this.m_);
|
|
|
+ };
|
|
|
+
|
|
|
+ contextPrototype.restore = function() {
|
|
|
+ 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 = this.getCoords_(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
|
Martin Edenhofer