731 lines
22 KiB
JavaScript
731 lines
22 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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// TODO: Patterns
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// TODO: Radial gradient
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// TODO: Clipping paths
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// TODO: Coordsize (still need to support stretching)
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// TODO: Painting mode
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// TODO: Optimize
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// TODO: canvas width/height sets content size in moz, border size in ie
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// only add this code if we do not already have a canvas implementation
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if (!window.CanvasRenderingContext2D) {
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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 G_vmlCanvasManager_ = {
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init: function (opt_doc) {
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var doc = opt_doc || document;
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if (/MSIE/.test(navigator.userAgent) && !window.opera) {
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var self = this;
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doc.attachEvent("onreadystatechange", function () {
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self.init_(doc);
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});
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}
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},
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init_: function (doc, e) {
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if (doc.readyState == "complete") {
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// create xmlns
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if (!doc.namespaces["g_vml_"]) {
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doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml");
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}
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// setup default css
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var ss = doc.createStyleSheet();
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ss.cssText = "canvas{display:inline-block;overflow:hidden;" +
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"text-align:left;}" +
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"canvas *{behavior:url(#default#VML)}";
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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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if (!els[i].getContext) {
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this.initElement(els[i]);
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}
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}
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}
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},
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fixElement_: function (el) {
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// in IE before version 5.5 we would need to add HTML: to the tag name
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// but we do not care about IE before version 6
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var outerHTML = el.outerHTML;
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var newEl = document.createElement(outerHTML);
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// if the tag is still open IE has created the children as siblings and
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// it has also created a tag with the name "/FOO"
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if (outerHTML.slice(-2) != "/>") {
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var tagName = "/" + el.tagName;
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var ns;
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// remove content
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while ((ns = el.nextSibling) && ns.tagName != tagName) {
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ns.removeNode();
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}
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// remove the incorrect closing tag
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if (ns) {
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ns.removeNode();
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}
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}
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el.parentNode.replaceChild(newEl, el);
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return newEl;
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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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el = this.fixElement_(el);
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el.getContext = function () {
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if (this.context_) {
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return this.context_;
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}
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return this.context_ = new CanvasRenderingContext2D_(this);
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};
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// do not use inline function because that will leak memory
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// el.attachEvent('onpropertychange', onPropertyChange)
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el.attachEvent('onresize', onResize);
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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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}
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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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}
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//el.getContext().setCoordsize_()
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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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// we need to watch changes to width and height
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switch (e.propertyName) {
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case 'width':
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case 'height':
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// TODO: coordsize and size
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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 dec2hex = [];
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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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dec2hex[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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}
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function processStyle(styleString) {
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var str, alpha = 1;
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styleString = String(styleString);
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if (styleString.substring(0, 3) == "rgb") {
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var start = styleString.indexOf("(", 3);
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var end = styleString.indexOf(")", start + 1);
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var guts = styleString.substring(start + 1, end).split(",");
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str = "#";
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for (var i = 0; i < 3; i++) {
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str += dec2hex[parseInt(guts[i])];
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}
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if ((guts.length == 4) && (styleString.substr(3, 1) == "a")) {
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alpha = guts[3];
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}
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} else {
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str = styleString;
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}
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return [str, alpha];
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}
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function processLineCap(lineCap) {
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switch (lineCap) {
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case "butt":
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return "flat";
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case "round":
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return "round";
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case "square":
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default:
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return "square";
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}
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}
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/**
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* This class implements CanvasRenderingContext2D interface as described by
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* the WHATWG.
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* @param {HTMLElement} surfaceElement The element that the 2D context should
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* be associated with
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*/
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function CanvasRenderingContext2D_(surfaceElement) {
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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 = "#ccc";
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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 = 10;
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this.globalAlpha = 1;
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var el = document.createElement('div');
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el.style.width = surfaceElement.clientWidth + 'px';
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el.style.height = surfaceElement.clientHeight + 'px';
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el.style.overflow = 'hidden';
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el.style.position = 'absolute';
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surfaceElement.appendChild(el);
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this.element_ = el;
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};
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var contextPrototype = CanvasRenderingContext2D_.prototype;
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contextPrototype.clearRect = function() {
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this.element_.innerHTML = "";
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this.currentPath_ = [];
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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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this.currentPath_.push({type: "moveTo", x: aX, y: aY});
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};
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contextPrototype.lineTo = function(aX, aY) {
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this.currentPath_.push({type: "lineTo", x: aX, y: aY});
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};
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contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
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aCP2x, aCP2y,
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aX, aY) {
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this.currentPath_.push({type: "bezierCurveTo",
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cp1x: aCP1x,
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cp1y: aCP1y,
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cp2x: aCP2x,
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cp2y: aCP2y,
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x: aX,
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y: aY});
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};
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contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
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// VML's qb produces different output to Firefox's
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// FF's behaviour seems to have changed in 1.5.0.1, check this
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this.bezierCurveTo(aCPx, aCPy, aCPx, aCPy, aX, aY);
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};
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contextPrototype.arc = function(aX, aY, aRadius,
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aStartAngle, aEndAngle, aClockwise) {
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if (!aClockwise) {
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var t = aStartAngle;
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aStartAngle = aEndAngle;
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aEndAngle = t;
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}
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aRadius *= 10;
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var xStart = aX + (mc(aStartAngle) * aRadius) - 5;
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var yStart = aY + (ms(aStartAngle) * aRadius) - 5;
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var xEnd = aX + (mc(aEndAngle) * aRadius) - 5;
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var yEnd = aY + (ms(aEndAngle) * aRadius) - 5;
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this.currentPath_.push({type: "arc",
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x: aX,
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y: aY,
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radius: aRadius,
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xStart: xStart,
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yStart: yStart,
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xEnd: xEnd,
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yEnd: yEnd});
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};
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contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
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this.moveTo(aX, aY);
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this.lineTo(aX + aWidth, aY);
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this.lineTo(aX + aWidth, aY + aHeight);
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this.lineTo(aX, aY + aHeight);
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this.closePath();
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};
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contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
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// Will destroy any existing path (same as FF behaviour)
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this.beginPath();
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this.moveTo(aX, aY);
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this.lineTo(aX + aWidth, aY);
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this.lineTo(aX + aWidth, aY + aHeight);
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this.lineTo(aX, aY + aHeight);
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this.closePath();
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this.stroke();
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};
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contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
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// Will destroy any existing path (same as FF behaviour)
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this.beginPath();
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this.moveTo(aX, aY);
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this.lineTo(aX + aWidth, aY);
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this.lineTo(aX + aWidth, aY + aHeight);
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this.lineTo(aX, aY + aHeight);
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this.closePath();
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this.fill();
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};
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contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
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var gradient = new CanvasGradient_("gradient");
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return gradient;
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};
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contextPrototype.createRadialGradient = function(aX0, aY0,
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aR0, aX1,
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aY1, aR1) {
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var gradient = new CanvasGradient_("gradientradial");
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gradient.radius1_ = aR0;
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gradient.radius2_ = aR1;
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gradient.focus_.x = aX0;
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gradient.focus_.y = aY0;
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return gradient;
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};
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contextPrototype.drawImage = function (image, var_args) {
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var dx, dy, dw, dh, sx, sy, sw, sh;
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var w = image.width;
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var h = image.height;
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if (arguments.length == 3) {
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dx = arguments[1];
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dy = arguments[2];
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sx = sy = 0;
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sw = dw = w;
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sh = dh = h;
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} else if (arguments.length == 5) {
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dx = arguments[1];
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dy = arguments[2];
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dw = arguments[3];
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dh = arguments[4];
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sx = sy = 0;
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sw = w;
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sh = h;
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} else if (arguments.length == 9) {
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sx = arguments[1];
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sy = arguments[2];
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sw = arguments[3];
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sh = arguments[4];
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dx = arguments[5];
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dy = arguments[6];
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dw = arguments[7];
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dh = arguments[8];
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} else {
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throw "Invalid number of arguments";
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}
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var d = this.getCoords_(dx, dy);
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var w2 = (sw / 2);
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var h2 = (sh / 2);
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var vmlStr = [];
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// For some reason that I've now forgotten, using divs didn't work
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vmlStr.push(' <g_vml_:group',
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' coordsize="1000,1000"',
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' coordorigin="0, 0"' ,
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' style="width:100px;height:100px;position:absolute;');
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// If filters are necessary (rotation exists), create them
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// filters are bog-slow, so only create them if abbsolutely necessary
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// The following check doesn't account for skews (which don't exist
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// in the canvas spec (yet) anyway.
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if (this.m_[0][0] != 1 || this.m_[0][1]) {
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var filter = [];
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// Note the 12/21 reversal
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filter.push("M11='", this.m_[0][0], "',",
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"M12='", this.m_[1][0], "',",
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"M21='", this.m_[0][1], "',",
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"M22='", this.m_[1][1], "',",
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"Dx='", d.x, "',",
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"Dy='", d.y, "'");
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// Bounding box calculation (need to minimize displayed area so that
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// filters don't waste time on unused pixels.
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var max = d;
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var c2 = this.getCoords_(dx+dw, dy);
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var c3 = this.getCoords_(dx, dy+dh);
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var c4 = this.getCoords_(dx+dw, dy+dh);
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max.x = Math.max(max.x, c2.x, c3.x, c4.x);
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max.y = Math.max(max.y, c2.y, c3.y, c4.y);
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vmlStr.push(" padding:0 ", mr(max.x), "px ", mr(max.y),
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"px 0;filter:progid:DXImageTransform.Microsoft.Matrix(",
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filter.join(""), ", sizingmethod='clip');")
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} else {
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vmlStr.push(" top:", d.y, "px;left:", d.x, "px;")
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}
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vmlStr.push(' ">' ,
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'<g_vml_:image src="', image.src, '"',
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' style="width:', dw, ';',
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' height:', dh, ';"',
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' cropleft="', sx / w, '"',
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' croptop="', sy / h, '"',
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' cropright="', (w - sx - sw) / w, '"',
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' cropbottom="', (h - sy - sh) / h, '"',
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' />',
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'</g_vml_:group>');
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this.element_.insertAdjacentHTML("BeforeEnd",
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vmlStr.join(""));
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};
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contextPrototype.stroke = function(aFill) {
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var lineStr = [];
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var lineOpen = false;
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var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
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var color = a[0];
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var opacity = a[1] * this.globalAlpha;
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lineStr.push('<g_vml_:shape',
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' fillcolor="', color, '"',
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' filled="', Boolean(aFill), '"',
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' style="position:absolute;width:10;height:10;"',
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' coordorigin="0 0" coordsize="100 100"',
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' stroked="', !aFill, '"',
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' strokeweight="', this.lineWidth, '"',
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' strokecolor="', color, '"',
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' path="');
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var newSeq = false;
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var min = {x: null, y: null};
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var max = {x: null, y: null};
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for (var i = 0; i < this.currentPath_.length; i++) {
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var p = this.currentPath_[i];
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if (p.type == "moveTo") {
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lineStr.push(" m ");
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var c = this.getCoords_(p.x, p.y);
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lineStr.push(mr(c.x), ",", mr(c.y));
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} else if (p.type == "lineTo") {
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lineStr.push(" l ");
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var c = this.getCoords_(p.x, p.y);
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lineStr.push(mr(c.x), ",", mr(c.y));
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} else if (p.type == "close") {
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lineStr.push(" x ");
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} else if (p.type == "bezierCurveTo") {
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lineStr.push(" c ");
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var c = this.getCoords_(p.x, p.y);
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var c1 = this.getCoords_(p.cp1x, p.cp1y);
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var c2 = this.getCoords_(p.cp2x, p.cp2y);
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lineStr.push(mr(c1.x), ",", mr(c1.y), ",",
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mr(c2.x), ",", mr(c2.y), ",",
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mr(c.x), ",", mr(c.y));
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} else if (p.type == "arc") {
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lineStr.push(" ar ");
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|
var c = this.getCoords_(p.x, p.y);
|
|
var cStart = this.getCoords_(p.xStart, p.yStart);
|
|
var cEnd = this.getCoords_(p.xEnd, p.yEnd);
|
|
|
|
// TODO: FIX (matricies (scale+rotation) now buggered this up)
|
|
// VML arc also doesn't seem able to do rotated non-circular
|
|
// arcs without parent grouping.
|
|
var absXScale = this.m_[0][0];
|
|
var absYScale = this.m_[1][1];
|
|
|
|
lineStr.push(mr(c.x - absXScale * p.radius), ",",
|
|
mr(c.y - absYScale * p.radius), " ",
|
|
mr(c.x + absXScale * p.radius), ",",
|
|
mr(c.y + absYScale * p.radius), " ",
|
|
mr(cStart.x), ",", mr(cStart.y), " ",
|
|
mr(cEnd.x), ",", mr(cEnd.y));
|
|
}
|
|
|
|
|
|
// TODO: Following is broken for curves due to
|
|
// move to proper paths.
|
|
|
|
// Figure out dimensions so we can do gradient fills
|
|
// properly
|
|
if(c) {
|
|
if (min.x == null || c.x < min.x) {
|
|
min.x = c.x;
|
|
}
|
|
if (max.x == null || c.x > max.x) {
|
|
max.x = c.x;
|
|
}
|
|
if (min.y == null || c.y < min.y) {
|
|
min.y = c.y;
|
|
}
|
|
if (max.y == null || c.y > max.y) {
|
|
max.y = c.y;
|
|
}
|
|
}
|
|
}
|
|
lineStr.push(' ">');
|
|
|
|
if (typeof this.fillStyle == "object") {
|
|
var focus = {x: "50%", y: "50%"};
|
|
var width = (max.x - min.x);
|
|
var height = (max.y - min.y);
|
|
var dimension = (width > height) ? width : height;
|
|
|
|
focus.x = mr((this.fillStyle.focus_.x / width) * 100 + 50) + "%";
|
|
focus.y = mr((this.fillStyle.focus_.y / height) * 100 + 50) + "%";
|
|
|
|
var colors = [];
|
|
|
|
// inside radius (%)
|
|
if (this.fillStyle.type_ == "gradientradial") {
|
|
var inside = (this.fillStyle.radius1_ / dimension * 100);
|
|
|
|
// percentage that outside radius exceeds inside radius
|
|
var expansion = (this.fillStyle.radius2_ / dimension * 100) - inside;
|
|
} else {
|
|
var inside = 0;
|
|
var expansion = 100;
|
|
}
|
|
|
|
var insidecolor = {offset: null, color: null};
|
|
var outsidecolor = {offset: null, color: null};
|
|
|
|
// We need to sort 'colors' by percentage, from 0 > 100 otherwise ie
|
|
// won't interpret it correctly
|
|
this.fillStyle.colors_.sort(function (cs1, cs2) {
|
|
return cs1.offset - cs2.offset;
|
|
});
|
|
|
|
for (var i = 0; i < this.fillStyle.colors_.length; i++) {
|
|
var fs = this.fillStyle.colors_[i];
|
|
|
|
colors.push( (fs.offset * expansion) + inside, "% ", fs.color, ",");
|
|
|
|
if (fs.offset > insidecolor.offset || insidecolor.offset == null) {
|
|
insidecolor.offset = fs.offset;
|
|
insidecolor.color = fs.color;
|
|
}
|
|
|
|
if (fs.offset < outsidecolor.offset || outsidecolor.offset == null) {
|
|
outsidecolor.offset = fs.offset;
|
|
outsidecolor.color = fs.color;
|
|
}
|
|
}
|
|
colors.pop();
|
|
|
|
lineStr.push('<g_vml_:fill',
|
|
' color="', outsidecolor.color, '"',
|
|
' color2="', insidecolor.color, '"',
|
|
' type="', this.fillStyle.type_, '"',
|
|
' focusposition="', focus.x, ', ', focus.y, '"',
|
|
' colors="', colors.join(""), '"',
|
|
' opacity="', opacity, '" />');
|
|
} else if (aFill) {
|
|
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, '" />');
|
|
} else {
|
|
lineStr.push(
|
|
'<g_vml_:stroke',
|
|
' opacity="', opacity,'"',
|
|
' joinstyle="', this.lineJoin, '"',
|
|
' miterlimit="', this.miterLimit, '"',
|
|
' endcap="', processLineCap(this.lineCap) ,'"',
|
|
' weight="', this.lineWidth, 'px"',
|
|
' color="', color,'" />'
|
|
);
|
|
}
|
|
|
|
lineStr.push("</g_vml_:shape>");
|
|
|
|
this.element_.insertAdjacentHTML("beforeEnd", lineStr.join(""));
|
|
|
|
this.currentPath_ = [];
|
|
};
|
|
|
|
contextPrototype.fill = function() {
|
|
this.stroke(true);
|
|
}
|
|
|
|
contextPrototype.closePath = function() {
|
|
this.currentPath_.push({type: "close"});
|
|
};
|
|
|
|
/**
|
|
* @private
|
|
*/
|
|
contextPrototype.getCoords_ = function(aX, aY) {
|
|
return {
|
|
x: 10 * (aX * this.m_[0][0] + aY * this.m_[1][0] + this.m_[2][0]) - 5,
|
|
y: 10 * (aX * this.m_[0][1] + aY * this.m_[1][1] + this.m_[2][1]) - 5
|
|
}
|
|
};
|
|
|
|
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() {
|
|
copyState(this.aStack_.pop(), this);
|
|
this.m_ = this.mStack_.pop();
|
|
};
|
|
|
|
contextPrototype.translate = function(aX, aY) {
|
|
var m1 = [
|
|
[1, 0, 0],
|
|
[0, 1, 0],
|
|
[aX, aY, 1]
|
|
];
|
|
|
|
this.m_ = matrixMultiply(m1, this.m_);
|
|
};
|
|
|
|
contextPrototype.rotate = function(aRot) {
|
|
var c = mc(aRot);
|
|
var s = ms(aRot);
|
|
|
|
var m1 = [
|
|
[c, s, 0],
|
|
[-s, c, 0],
|
|
[0, 0, 1]
|
|
];
|
|
|
|
this.m_ = matrixMultiply(m1, this.m_);
|
|
};
|
|
|
|
contextPrototype.scale = function(aX, aY) {
|
|
var m1 = [
|
|
[aX, 0, 0],
|
|
[0, aY, 0],
|
|
[0, 0, 1]
|
|
];
|
|
|
|
this.m_ = matrixMultiply(m1, this.m_);
|
|
};
|
|
|
|
/******** STUBS ********/
|
|
contextPrototype.clip = function() {
|
|
// TODO: Implement
|
|
};
|
|
|
|
contextPrototype.arcTo = function() {
|
|
// TODO: Implement
|
|
};
|
|
|
|
contextPrototype.createPattern = function() {
|
|
return new CanvasPattern_;
|
|
};
|
|
|
|
// Gradient / Pattern Stubs
|
|
function CanvasGradient_(aType) {
|
|
this.type_ = aType;
|
|
this.radius1_ = 0;
|
|
this.radius2_ = 0;
|
|
this.colors_ = [];
|
|
this.focus_ = {x: 0, y: 0};
|
|
}
|
|
|
|
CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) {
|
|
aColor = processStyle(aColor);
|
|
this.colors_.push({offset: 1-aOffset, color: aColor});
|
|
};
|
|
|
|
function CanvasPattern_() {}
|
|
|
|
// set up externs
|
|
G_vmlCanvasManager = G_vmlCanvasManager_;
|
|
CanvasRenderingContext2D = CanvasRenderingContext2D_;
|
|
CanvasGradient = CanvasGradient_;
|
|
CanvasPattern = CanvasPattern_;
|
|
|
|
})();
|
|
|
|
} // if
|