defr/drupal/scald/dnd: js/bt/other_libs/excanvas_0002/excanvas.js comparison

comparison js/bt/other_libs/excanvas_0002/excanvas.js @ 18:0d557e6e73f7

Added beautytips and some additional event handling code to the library.

author	David Eads <eads@chicagotech.org>
date	Fri, 06 Mar 2009 14:11:46 -0600
parents
children

comparison

equal deleted inserted replaced

-:1a77f87927dd
+:0d557e6e73f7
+// 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.
+// Known Issues:
+//
+// * Patterns are not implemented.
+// * Radial gradient are not implemented. The VML version of these look very
+//   different from the canvas one.
+// * Clipping paths are not implemented.
+// * Coordsize. The width and height attribute have higher priority than the
+//   width and height style values which isn't correct.
+// * Painting mode isn't implemented.
+// * Canvas width/height should is using content-box by default. IE in
+//   Quirks mode will draw the canvas using border-box. Either change your
+//   doctype to HTML5
+//   (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
+//   or use Box Sizing Behavior from WebFX
+//   (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
+// * Optimize. There is always room for speed improvements.
+// 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;
+// this is used for sub pixel precision
+var Z = 10;
+var Z2 = Z / 2;
+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) {
+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;" +
+// default size is 300x150 in Gecko and Opera
+"text-align:left;width:300px;height:150px}" +
+"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 = el.ownerDocument.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";
+} else {
+el.width = el.clientWidth;
+}
+if (attrs.height && attrs.height.specified) {
+// TODO: use runtimeStyle and coordsize
+// el.getContext().setHeight_(attrs.height.nodeValue);
+el.style.height = attrs.height.nodeValue + "px";
+} else {
+el.height = el.clientHeight;
+}
+//el.getContext().setCoordsize_()
+return el;
+}
+};
+function onPropertyChange(e) {
+var el = e.srcElement;
+switch (e.propertyName) {
+case 'width':
+el.style.width = el.attributes.width.nodeValue + "px";
+el.getContext().clearRect();
+break;
+case 'height':
+el.style.height = el.attributes.height.nodeValue + "px";
+el.getContext().clearRect();
+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;
+o2.arcScaleX_    = o1.arcScaleX_;
+o2.arcScaleY_    = o1.arcScaleY_;
+}
+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[Number(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 = "#000";
+this.lineWidth = 1;
+this.lineJoin = "miter";
+this.lineCap = "butt";
+this.miterLimit = Z * 1;
+this.globalAlpha = 1;
+this.canvas = surfaceElement;
+var el = surfaceElement.ownerDocument.createElement('div');
+el.style.width =  surfaceElement.clientWidth + 'px';
+el.style.height = surfaceElement.clientHeight + 'px';
+el.style.overflow = 'hidden';
+el.style.position = 'absolute';
+surfaceElement.appendChild(el);
+this.element_ = el;
+this.arcScaleX_ = 1;
+this.arcScaleY_ = 1;
+};
+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});
+this.currentX_ = aX;
+this.currentY_ = aY;
+};
+contextPrototype.lineTo = function(aX, aY) {
+this.currentPath_.push({type: "lineTo", x: aX, y: aY});
+this.currentX_ = aX;
+this.currentY_ = 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});
+this.currentX_ = aX;
+this.currentY_ = aY;
+};
+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 cp1x = this.currentX_ + 2.0 / 3.0 * (aCPx - this.currentX_);
+var cp1y = this.currentY_ + 2.0 / 3.0 * (aCPy - this.currentY_);
+var cp2x = cp1x + (aX - this.currentX_) / 3.0;
+var cp2y = cp1y + (aY - this.currentY_) / 3.0;
+this.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, aX, aY);
+};
+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
+}
+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;
+// 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 "Invalid number of arguments";
+}
+var d = this.getCoords_(dx, dy);
+var w2 = sw / 2;
+var h2 = sh / 2;
+var vmlStr = [];
+var W = 10;
+var H = 10;
+// For some reason that I've now forgotten, using divs didn't work
+vmlStr.push(' <g_vml_:group',
+' coordsize="', Z * W, ',', Z * H, '"',
+' coordorigin="0,0"' ,
+' style="width:', W, ';height:', H, ';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]) {
+var filter = [];
+// Note the 12/21 reversal
+filter.push("M11='", this.m_[0][0], "',",
+"M12='", this.m_[1][0], "',",
+"M21='", this.m_[0][1], "',",
+"M22='", this.m_[1][1], "',",
+"Dx='", mr(d.x / Z), "',",
+"Dy='", mr(d.y / Z), "'");
+// Bounding box calculation (need to minimize displayed area so that
+// filters don't waste time on unused pixels.
+var max = d;
+var c2 = this.getCoords_(dx + dw, dy);
+var c3 = this.getCoords_(dx, dy + dh);
+var c4 = this.getCoords_(dx + dw, dy + dh);
+max.x = Math.max(max.x, c2.x, c3.x, c4.x);
+max.y = Math.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, ';',
+' height:', Z * dh, ';"',
+' 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 lineStr = [];
+var lineOpen = false;
+var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
+var color = a[0];
+var opacity = a[1] * this.globalAlpha;
+var W = 10;
+var H = 10;
+lineStr.push('<g_vml_:shape',
+' fillcolor="', color, '"',
+' filled="', Boolean(aFill), '"',
+' style="position:absolute;width:', W, ';height:', H, ';"',
+' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
+' stroked="', !aFill, '"',
+' strokeweight="', this.lineWidth, '"',
+' strokecolor="', color, '"',
+' path="');
+var newSeq = false;
+var min = {x: null, y: null};
+var max = {x: null, y: null};
+for (var i = 0; i < this.currentPath_.length; i++) {
+var p = this.currentPath_[i];
+if (p.type == "moveTo") {
+lineStr.push(" m ");
+var c = this.getCoords_(p.x, p.y);
+lineStr.push(mr(c.x), ",", mr(c.y));
+} else if (p.type == "lineTo") {
+lineStr.push(" l ");
+var c = this.getCoords_(p.x, p.y);
+lineStr.push(mr(c.x), ",", mr(c.y));
+} else if (p.type == "close") {
+lineStr.push(" x ");
+} else if (p.type == "bezierCurveTo") {
+lineStr.push(" c ");
+var c = this.getCoords_(p.x, p.y);
+var c1 = this.getCoords_(p.cp1x, p.cp1y);
+var c2 = this.getCoords_(p.cp2x, p.cp2y);
+lineStr.push(mr(c1.x), ",", mr(c1.y), ",",
+mr(c2.x), ",", mr(c2.y), ",",
+mr(c.x), ",", mr(c.y));
+} else if (p.type == "at" || p.type == "wa") {
+lineStr.push(" ", p.type, " ");
+var c  = this.getCoords_(p.x, p.y);
+var cStart = this.getCoords_(p.xStart, p.yStart);
+var cEnd = this.getCoords_(p.xEnd, p.yEnd);
+lineStr.push(mr(c.x - this.arcScaleX_ * p.radius), ",",
+mr(c.y - this.arcScaleY_ * p.radius), " ",
+mr(c.x + this.arcScaleX_ * p.radius), ",",
+mr(c.y + this.arcScaleY_ * 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: Z * (aX * this.m_[0][0] + aY * this.m_[1][0] + this.m_[2][0]) - Z2,
+y: Z * (aX * this.m_[0][1] + aY * this.m_[1][1] + this.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() {
+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