// Copyright 2006 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // TODO: Patterns // TODO: Radial gradient // TODO: Clipping paths // TODO: Coordsize (still need to support stretching) // TODO: Painting mode // TODO: Optimize // TODO: canvas width/height sets content size in moz, border size in ie // only add this code if we do not already have a canvas implementation if (!window.CanvasRenderingContext2D) { (function () { // alias some functions to make (compiled) code shorter var m = Math; var mr = m.round; var ms = m.sin; var mc = m.cos; var G_vmlCanvasManager_ = { init: function (opt_doc) { var doc = opt_doc || document; if (/MSIE/.test(navigator.userAgent) && !window.opera) { var self = this; doc.attachEvent("onreadystatechange", function () { self.init_(doc); }); } }, init_: function (doc, e) { if (doc.readyState == "complete") { // create xmlns if (!doc.namespaces["g_vml_"]) { doc.namespaces.add("g_vml_", "urn:schemas-microsoft-com:vml"); } // setup default css var ss = doc.createStyleSheet(); ss.cssText = "canvas{display:inline-block;overflow:hidden;" + "text-align:left;}" + "g_vml_\\:*{behavior:url(#default#VML)}"; // find all canvas elements var els = doc.getElementsByTagName("canvas"); for (var i = 0; i < els.length; i++) { if (!els[i].getContext) { this.initElement(els[i]); } } } }, fixElement_: function (el) { // in IE before version 5.5 we would need to add HTML: to the tag name // but we do not care about IE before version 6 var outerHTML = el.outerHTML; var newEl = document.createElement(outerHTML); // if the tag is still open IE has created the children as siblings and // it has also created a tag with the name "/FOO" if (outerHTML.slice(-2) != "/>") { var tagName = "/" + el.tagName; var ns; // remove content while ((ns = el.nextSibling) && ns.tagName != tagName) { ns.removeNode(); } // remove the incorrect closing tag if (ns) { ns.removeNode(); } } el.parentNode.replaceChild(newEl, el); return newEl; }, /** * Public initializes a canvas element so that it can be used as canvas * element from now on. This is called automatically before the page is * loaded but if you are creating elements using createElement you need to * make sure this is called on the element. * @param {HTMLElement} el The canvas element to initialize. * @return {HTMLElement} the element that was created. */ initElement: function (el) { el = this.fixElement_(el); el.getContext = function () { if (this.context_) { return this.context_; } return this.context_ = new CanvasRenderingContext2D_(this); }; // do not use inline function because that will leak memory // el.attachEvent('onpropertychange', onPropertyChange) el.attachEvent('onresize', onResize); var attrs = el.attributes; if (attrs.width && attrs.width.specified) { // TODO: use runtimeStyle and coordsize // el.getContext().setWidth_(attrs.width.nodeValue); el.style.width = attrs.width.nodeValue + "px"; } if (attrs.height && attrs.height.specified) { // TODO: use runtimeStyle and coordsize // el.getContext().setHeight_(attrs.height.nodeValue); el.style.height = attrs.height.nodeValue + "px"; } //el.getContext().setCoordsize_() return el; } }; function onPropertyChange(e) { // we need to watch changes to width and height switch (e.propertyName) { case 'width': case 'height': // TODO: coordsize and size break; } } function onResize(e) { var el = e.srcElement; if (el.firstChild) { el.firstChild.style.width = el.clientWidth + 'px'; el.firstChild.style.height = el.clientHeight + 'px'; } } G_vmlCanvasManager_.init(); // precompute "00" to "FF" var dec2hex = []; for (var i = 0; i < 16; i++) { for (var j = 0; j < 16; j++) { dec2hex[i * 16 + j] = i.toString(16) + j.toString(16); } } function createMatrixIdentity() { return [ [1, 0, 0], [0, 1, 0], [0, 0, 1] ]; } function matrixMultiply(m1, m2) { var result = createMatrixIdentity(); for (var x = 0; x < 3; x++) { for (var y = 0; y < 3; y++) { var sum = 0; for (var z = 0; z < 3; z++) { sum += m1[x][z] * m2[z][y]; } result[x][y] = sum; } } return result; } function copyState(o1, o2) { o2.fillStyle = o1.fillStyle; o2.lineCap = o1.lineCap; o2.lineJoin = o1.lineJoin; o2.lineWidth = o1.lineWidth; o2.miterLimit = o1.miterLimit; o2.shadowBlur = o1.shadowBlur; o2.shadowColor = o1.shadowColor; o2.shadowOffsetX = o1.shadowOffsetX; o2.shadowOffsetY = o1.shadowOffsetY; o2.strokeStyle = o1.strokeStyle; } function processStyle(styleString) { var str, alpha = 1; styleString = String(styleString); if (styleString.substring(0, 3) == "rgb") { var start = styleString.indexOf("(", 3); var end = styleString.indexOf(")", start + 1); var guts = styleString.substring(start + 1, end).split(","); str = "#"; for (var i = 0; i < 3; i++) { str += dec2hex[parseInt(guts[i])]; } if ((guts.length == 4) && (styleString.substr(3, 1) == "a")) { alpha = guts[3]; } } else { str = styleString; } return [str, alpha]; } function processLineCap(lineCap) { switch (lineCap) { case "butt": return "flat"; case "round": return "round"; case "square": default: return "square"; } } /** * This class implements CanvasRenderingContext2D interface as described by * the WHATWG. * @param {HTMLElement} surfaceElement The element that the 2D context should * be associated with */ function CanvasRenderingContext2D_(surfaceElement) { this.m_ = createMatrixIdentity(); this.mStack_ = []; this.aStack_ = []; this.currentPath_ = []; // Canvas context properties this.strokeStyle = "#000"; this.fillStyle = "#ccc"; this.lineWidth = 1; this.lineJoin = "miter"; this.lineCap = "butt"; this.miterLimit = 10; this.globalAlpha = 1; var el = document.createElement('div'); el.style.width = surfaceElement.clientWidth + 'px'; el.style.height = surfaceElement.clientHeight + 'px'; el.style.overflow = 'hidden'; el.style.position = 'absolute'; surfaceElement.appendChild(el); this.element_ = el; this.arcScaleX_ = 1; this.arcScaleY_ = 1; }; var contextPrototype = CanvasRenderingContext2D_.prototype; contextPrototype.clearRect = function() { this.element_.innerHTML = ""; this.currentPath_ = []; }; 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) { this.currentPath_.push({type: "moveTo", x: aX, y: aY}); }; contextPrototype.lineTo = function(aX, aY) { this.currentPath_.push({type: "lineTo", x: aX, y: aY}); }; contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, aCP2x, aCP2y, aX, aY) { this.currentPath_.push({type: "bezierCurveTo", cp1x: aCP1x, cp1y: aCP1y, cp2x: aCP2x, cp2y: aCP2y, x: aX, y: aY}); }; contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { // VML's qb produces different output to Firefox's // FF's behaviour seems to have changed in 1.5.0.1, check this this.bezierCurveTo(aCPx, aCPy, aCPx, aCPy, aX, aY); }; contextPrototype.arc = function(aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) { aRadius *= 10; var arcType = aClockwise ? "at" : "wa"; var xStart = aX + (mc(aStartAngle) * aRadius) - 5; var yStart = aY + (ms(aStartAngle) * aRadius) - 5; var xEnd = aX + (mc(aEndAngle) * aRadius) - 5; var yEnd = aY + (ms(aEndAngle) * aRadius) - 5; this.currentPath_.push({type: arcType, x: aX, y: aY, radius: aRadius, xStart: xStart, yStart: yStart, xEnd: xEnd, yEnd: yEnd}); }; 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) { // Will destroy any existing path (same as FF behaviour) 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(); }; contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { // Will destroy any existing path (same as FF behaviour) 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(); }; contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { var gradient = new CanvasGradient_("gradient"); return gradient; }; contextPrototype.createRadialGradient = function(aX0, aY0, aR0, aX1, aY1, aR1) { var gradient = new CanvasGradient_("gradientradial"); gradient.radius1_ = aR0; gradient.radius2_ = aR1; gradient.focus_.x = aX0; gradient.focus_.y = aY0; return gradient; }; contextPrototype.drawImage = function (image, var_args) { var dx, dy, dw, dh, sx, sy, sw, sh; var w = image.width; var h = image.height; 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 "Invalid number of arguments"; } var d = this.getCoords_(dx, dy); var w2 = (sw / 2); var h2 = (sh / 2); var vmlStr = []; // For some reason that I've now forgotten, using divs didn't work vmlStr.push(' ' , '', ''); this.element_.insertAdjacentHTML("BeforeEnd", vmlStr.join("")); }; contextPrototype.stroke = function(aFill) { var lineStr = []; var lineOpen = false; var a = processStyle(aFill ? this.fillStyle : this.strokeStyle); var color = a[0]; var opacity = a[1] * this.globalAlpha; lineStr.push(' 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(''); } else if (aFill) { lineStr.push(''); } else { lineStr.push( '' ); } lineStr.push(""); 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) { this.arcScaleX_ *= aX; this.arcScaleY_ *= 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