1633 lines
44 KiB
JavaScript
1633 lines
44 KiB
JavaScript
// 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 (
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this.context_ || (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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* 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 =
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"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) 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 (
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"#" +
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decToHex[Math.floor(r * 255)] +
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decToHex[Math.floor(g * 255)] +
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decToHex[Math.floor(b * 255)]
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);
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}
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function hueToRgb(m1, m2, h) {
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if (h < 0) h++;
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if (h > 1) h--;
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if (6 * h < 1) return m1 + (m2 - m1) * 6 * h;
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else if (2 * h < 1) return m2;
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else if (3 * h < 2) return m1 + (m2 - m1) * (2 / 3 - h) * 6;
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else 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,
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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 = "#",
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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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|
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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) {
|
|
// 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 / 0.75;
|
|
} 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
|
|
);
|
|
}
|
|
|
|
var lineCapMap = {
|
|
butt: "flat",
|
|
round: "round",
|
|
};
|
|
|
|
function processLineCap(lineCap) {
|
|
return lineCapMap[lineCap] || "square";
|
|
}
|
|
|
|
/**
|
|
* This class implements CanvasRenderingContext2D interface as described by
|
|
* the WHATWG.
|
|
* @param {HTMLElement} canvasElement The element that the 2D context should
|
|
* be associated with
|
|
*/
|
|
function CanvasRenderingContext2D_(canvasElement) {
|
|
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 = canvasElement;
|
|
|
|
var cssText =
|
|
"width:" +
|
|
canvasElement.clientWidth +
|
|
"px;height:" +
|
|
canvasElement.clientHeight +
|
|
"px;overflow:hidden;position:absolute";
|
|
var el = canvasElement.ownerDocument.createElement("div");
|
|
el.style.cssText = cssText;
|
|
canvasElement.appendChild(el);
|
|
|
|
var overlayEl = el.cloneNode(false);
|
|
// Use a non transparent background.
|
|
overlayEl.style.backgroundColor = "red";
|
|
overlayEl.style.filter = "alpha(opacity=0)";
|
|
canvasElement.appendChild(overlayEl);
|
|
|
|
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 = getCoords(this, 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 = 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
|