// 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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// 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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// 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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return computedStyle;
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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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var lineCapMap = {
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'butt': 'flat',
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'round': 'round'
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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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* 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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this.mStack_ = [];
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this.aStack_ = [];
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this.currentPath_ = [];
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// Canvas context properties
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this.strokeStyle = '#000';
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this.fillStyle = '#000';
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this.lineWidth = 1;
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this.lineJoin = 'miter';
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this.lineCap = 'butt';
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this.miterLimit = Z * 1;
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this.globalAlpha = 1;
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this.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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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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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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this.element_ = el;
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this.arcScaleX_ = 1;
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this.arcScaleY_ = 1;
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this.lineScale_ = 1;
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}
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var contextPrototype = CanvasRenderingContext2D_.prototype;
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contextPrototype.clearRect = function() {
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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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contextPrototype.beginPath = function() {
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// TODO: Branch current matrix so that save/restore has no effect
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// as per safari docs.
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this.currentPath_ = [];
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};
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contextPrototype.moveTo = function(aX, aY) {
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var p = 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;
|
this.currentY_ = p.y;
|
};
|
|
contextPrototype.lineTo = function(aX, aY) {
|
var p = getCoords(this, 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 = getCoords(this, aX, aY);
|
var cp1 = getCoords(this, aCP1x, aCP1y);
|
var cp2 = getCoords(this, 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 = getCoords(this, aCPx, aCPy);
|
var p = getCoords(this, 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 = getCoords(this, aX, aY);
|
var pStart = getCoords(this, xStart, yStart);
|
var pEnd = getCoords(this, 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 = getCoords(this, 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 = getCoords(this, dx + dw, dy);
|
var c3 = getCoords(this, dx, dy + dh);
|
var c4 = getCoords(this, 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 = 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
|
