details: http://www.bx.psu.edu/hg/galaxy/rev/6eac08f7edcf changeset: 1478:6eac08f7edcf user: James Taylor <james@jamestaylor.org> date: Fri Aug 22 17:44:32 2008 -0400 description: Add excanvas javascript (emulates <canvas> in IE using silverlight) 2 file(s) affected in this change: static/scripts/excanvas.js static/scripts/packed/excanvas.js diffs (780 lines): diff -r 99e223f6a132 -r 6eac08f7edcf static/scripts/excanvas.js --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/static/scripts/excanvas.js Fri Aug 22 17:44:32 2008 -0400 @@ -0,0 +1,770 @@ +// 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: (From VML version) +// +// * 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. + +//Known Issues: Silverlight version +// +// * Doing a transformation during a path (ie lineTo, transform, lineTo) will +// not work corerctly because the transform is done to the whole path (ie +// transform, lineTo, lineTo) +// * Patterns are not yet implemented. + + +// only add this code if we do not already have a canvas implementation +if (!window.CanvasRenderingContext2D) { + +(function () { + + var xamlId; + + var G_vmlCanvasManager_ = { + init: function (opt_doc) { + var doc = opt_doc || document; + // Create a dummy element so that IE will allow canvas elements to be + // recognized. + doc.createElement('canvas'); + if (/MSIE/.test(navigator.userAgent) && !window.opera) { + var self = this; + + createXamlScriptTag(); + + doc.attachEvent('onreadystatechange', function () { + self.init_(doc); + }); + } + }, + + init_: function (doc) { + // 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}' + + 'canvas object{width:100%;height:100%;border:0;' + + 'background:transparen;margin:0}'; + + // 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]); + } + } + }, + + + /** + * 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.getContext = function () { + if (this.context_) { + return this.context_; + } + return this.context_ = new CanvasRenderingContext2D_(this); + }; + + 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; + } + + // insert object tag + el.innerHTML = getObjectHtml(); + + // do not use inline function because that will leak memory + el.attachEvent('onpropertychange', onPropertyChange); + 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; + } + } + + G_vmlCanvasManager_.init(); + + function createXamlScriptTag() { + // This script tag contains the boilerplate XAML. + document.write('<script type=text/xaml>' + + '<Canvas x:Name="root" ' + + 'xmlns="http://schemas.microsoft.com/client/2007" ' + + 'xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" ' + + 'Width="300" ' + + 'Height="150" ' + + 'Background="Transparent"> ' + + '</Canvas>' + + '</script>'); + // Find the id of the writtenscript file. + var scripts = document.scripts; + var script = scripts[scripts.length - 1]; + xamlId = script.uniqueID; + script.id = xamlId; + } + + function getObjectHtml(fn) { + return '<object type="application/x-silverlight" >' + + '<param name="windowless" value="true">' + + '<param name="background" value="transparent">' + + '<param name="source" value="#' + xamlId + '">' + + '</object>'; + } + + function hasSilverlight() { + try { + new ActiveXObject('AgControl.AgControl'); + return true; + } catch(_) { + return false; + } + } + + // 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 doTransform(ctx) { + transformObject(ctx, getRoot(ctx), ctx.m_); + } + + function transformObject(ctx, obj, m) { + var transform = obj.renderTransform; + var matrix; + if (!transform) { + transform = create(ctx, '<MatrixTransform/>'); + matrix = create(ctx, '<Matrix/>'); + transform.matrix = matrix; + obj.renderTransform = transform; + } else { + matrix = transform.matrix; + } + + matrix.m11 = m[0][0]; + matrix.m12 = m[0][1]; + matrix.m21 = m[1][0]; + matrix.m22 = m[1][1]; + matrix.offsetX = m[2][0]; + matrix.offsetY = m[2][1]; + } + + 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.globalAlpha = o1.globalAlpha; + o2.arcScaleX_ = o1.arcScaleX_; + o2.arcScaleY_ = o1.arcScaleY_; + } + + function translateColor(s) { + var rgbaMatch = /rgba\(([^)]+)\)/gi.exec(s); + if (rgbaMatch) { + var parts = rgbaMatch[1].split(','); + return '#' + dec2hex[Math.floor(Number(parts[3]) * 255)] + + dec2hex[Number(parts[0])] + + dec2hex[Number(parts[1])] + + dec2hex[Number(parts[2])]; + } + + var rgbMatch = /rgb\(([^)]+)\)/gi.exec(s); + if (rgbMatch) { + var parts = rgbMatch[1].split(','); + return '#FF' + dec2hex[Number(parts[0])] + + dec2hex[Number(parts[1])] + + dec2hex[Number(parts[2])]; + } + + return s; + } + + function processLineCap(lineCap) { + switch (lineCap) { + case 'butt': + return 'flat'; + case 'round': + return 'round'; + case 'square': + default: + return 'square'; + } + } + + function getRoot(ctx) { + return ctx.canvas.firstChild.content.findName('root'); + } + + function create(ctx, s, opt_args) { + if (opt_args) { + s = s.replace(/\%(\d+)/g, function(match, index) { + return opt_args[Number(index) - 1]; + }); + } + + try { + return ctx.canvas.firstChild.content.createFromXaml(s); + } catch (ex) { + throw Error('Could not create XAML from: ' + s); + } + } + + function drawShape(ctx, s, opt_args) { + var canvas = ctx.lastCanvas_ || create(ctx, '<Canvas/>'); + var shape = create(ctx, s, opt_args); + canvas.children.add(shape); + transformObject(ctx, canvas, ctx.m_); + if (!ctx.lastCanvas_) { + getRoot(ctx).children.add(canvas); + ctx.lastCanvas_ = canvas; + } + return shape; + } + + function createBrushObject(ctx, value) { + if (value instanceof CanvasGradient_) { + return value.createBrush_(ctx); + } else if (value instanceof CanvasPattern_) { + throw Error('Not implemented'); + } else { + return create(ctx, '<SolidColorBrush Color="%1"/>', + [translateColor(value)]); + } + } + + /** + * 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.lastCanvas_ = null; + + 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 = 10; + this.globalAlpha = 1; + this.canvas = surfaceElement; + }; + + + var contextPrototype = CanvasRenderingContext2D_.prototype; + + contextPrototype.clearRect = function() { + var root = getRoot(this); + root.children.clear(); + + // TODO: Implement + this.currentPath_ = []; + this.lastCanvas_ = null; + + }; + + 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('M' + aX + ',' + aY); + }; + + contextPrototype.lineTo = function(aX, aY) { + if (this.currentPath_.length == 0) return; + this.currentPath_.push('L' + aX + ',' + aY); + }; + + contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, + aCP2x, aCP2y, + aX, aY) { + if (this.currentPath_.length == 0) return; + this.currentPath_.push('C' + aCP1x + ',' + aCP1y + ' ' + + aCP2x + ',' + aCP2y + ' ' + + aX + ' ' + aY); + }; + + contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { + if (this.currentPath_.length == 0) return; + this.currentPath_.push('Q' + aCPx + ',' + aCPy + ' ' + + aX + ',' + aY); + }; + + contextPrototype.arcTo = function(x1, y1, x2, y2, radius) { + if (this.currentPath_.length == 0) return; + // TODO: Implement + }; + + contextPrototype.arc = function(aX, aY, aRadius, + aStartAngle, aEndAngle, aClockwise) { + var deltaAngle = Math.abs(aStartAngle - aEndAngle); + // If start and stop are the same WebKit and Moz does nothing + if (aStartAngle == aEndAngle) { + // different browsers behave differently here so we do the easiest thing + return; + } + + var endX = aX + aRadius * Math.cos(aEndAngle); + var endY = aY + aRadius * Math.sin(aEndAngle); + + if (deltaAngle >= 2 * Math.PI) { + // if larger than 2PI + this.arc(aX, aY, aRadius, aStartAngle, aStartAngle + Math.PI, aClockwise); + this.arc(aX, aY, aRadius, aStartAngle + Math.PI, + aStartAngle + 2 * Math.PI, aClockwise); + // now move to end point + this.moveTo(endX, endY); + return; + } + + var startX = aX + aRadius * Math.cos(aStartAngle); + var startY = aY + aRadius * Math.sin(aStartAngle); + var rotationAngle = deltaAngle * 180 / Math.PI; // sign, abs? + var sweepDirection = aClockwise ? 0 : 1; + var isLargeArc = rotationAngle >= 180 == Boolean(aClockwise) ? 0 : 1; + + if (this.currentPath_.length != 0) { + // add line to start point + this.lineTo(startX, startY); + } else { + this.moveTo(startX, startY); + } + + this.currentPath_.push('A' + aRadius + ',' + aRadius + ' ' + + rotationAngle + ' ' + + isLargeArc + ' ' + + sweepDirection + ' ' + + endX + ',' + endY); + }; + + 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(); + this.currentPath_ = []; + }; + + 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(); + this.currentPath_ = []; + }; + + contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { + return new LinearCanvasGradient_(aX0, aY0, aX1, aY1); + }; + + contextPrototype.createRadialGradient = function(x0, y0, + r0, x1, + y1, r1) { + return new RadialCanvasGradient_(x0, y0, r0, x1, y1, r1); + }; + + contextPrototype.drawImage = function (image, var_args) { + var dx, dy, dw, dh, sx, sy, sw, sh; + + // For Silverlight we don't need to get the size of the image since + // Silverlight uses the image original dimension if not provided. + + if (arguments.length == 3) { + dx = arguments[1]; + dy = arguments[2]; + // Keep sx, sy, sw, dw, sh and dh undefined + } else if (arguments.length == 5) { + dx = arguments[1]; + dy = arguments[2]; + dw = arguments[3]; + dh = arguments[4]; + // Keep sx, sy, sw and sh undefined + } 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 slImage; + + // If we have a source rect we need to clip the image. + if (arguments.length == 9) { + slImage = drawShape(this, '<Image Source="%1"/>', [image.src]); + + var clipRect = create(this, + '<RectangleGeometry Rect="%1,%2,%3,%4"/>', [sx, sy, sw, sh]); + slImage.clip = clipRect; + + var m = createMatrixIdentity(); + + // translate to 0,0 + m[2][0] = -sx; + m[2][1] = -sy; + + // scale + var m2 = createMatrixIdentity(); + m2[0][0] = dw / sw; + m2[1][1] = dh / sh; + + m = matrixMultiply(m, m2); + + // translate to destination + m[2][0] += dx; + m[2][1] += dy; + + transformObject(this, slImage, m); + + } else { + slImage = drawShape(this, + '<Image Source="%1" Canvas.Left="%2" Canvas.Top="%3"/>', + [image.src, dx, dy]); + if (dw != undefined || dh != undefined) { + slImage.width = dw; + slImage.height = dh; + slImage.stretch = 'fill'; + } + } + }; + + contextPrototype.stroke = function() { + if (this.currentPath_.length == 0) return; + var path = drawShape(this, '<Path Data="%1"/>', + [this.currentPath_.join(' ')]); + path.stroke = createBrushObject(this, this.strokeStyle); + path.opacity = this.globalAlpha; + path.strokeThickness = this.lineWidth; + path.strokeMiterLimit = this.miterLimit; + path.strokeLineJoin = this.lineJoin; + // Canvas does not differentiate start from end + path.strokeEndLineCap = path.strokeStartLineCap = + processLineCap(this.lineCap); + }; + + contextPrototype.fill = function() { + if (this.currentPath_.length == 0) return; + var path = drawShape(this, '<Path Data="%1"/>', + [this.currentPath_.join(' ')]); + // The spec says to use non zero but Silverlight uses EvenOdd by defaul + path.data.fillRule = 'NonZero'; + path.fill = createBrushObject(this, this.fillStyle); + // TODO: What about even-odd etc? + }; + + contextPrototype.closePath = function() { + this.currentPath_.push('z'); + }; + + /** + * Sets the transformation matrix and marks things as dirty + */ + function setM(self, m) { + self.m_ = m; + self.lastCanvas_ = null; + }; + + contextPrototype.save = function() { + var o = {}; + copyState(this, o); + this.aStack_.push(o); + this.mStack_.push(this.m_); + setM(this, matrixMultiply(createMatrixIdentity(), this.m_)); + }; + + contextPrototype.restore = function() { + copyState(this.aStack_.pop(), this); + setM(this, this.mStack_.pop()); + }; + + contextPrototype.translate = function(aX, aY) { + var m1 = [ + [1, 0, 0], + [0, 1, 0], + [aX, aY, 1] + ]; + + setM(this, matrixMultiply(m1, this.m_)); + }; + + contextPrototype.rotate = function(aRot) { + var c = Math.cos(aRot); + var s = Math.sin(aRot); + + var m1 = [ + [c, s, 0], + [-s, c, 0], + [0, 0, 1] + ]; + + setM(this, matrixMultiply(m1, this.m_)); + }; + + contextPrototype.scale = function(aX, aY) { + var m1 = [ + [aX, 0, 0], + [0, aY, 0], + [0, 0, 1] + ]; + + setM(this, matrixMultiply(m1, this.m_)); + }; + + 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_)); + }; + + contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { + setM(this, [ + [m11, m12, 0], + [m21, m22, 0], + [ dx, dy, 1], + ]); + }; + + /******** STUBS ********/ + contextPrototype.clip = function() { + // TODO: Implement + }; + + contextPrototype.createPattern = function() { + return new CanvasPattern_; + }; + + // Gradient / Pattern Stubs + function CanvasGradient_() { + this.colors_ = []; + } + + CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { + aColor = translateColor(aColor); + this.colors_.push({offset: aOffset, color: aColor}); + }; + + CanvasGradient_.prototype.createStops_ = function(ctx, brushObj, colors) { + var gradientStopCollection = brushObj.gradientStops; + for (var i = 0, c; c = colors[i]; i++) { + var color = translateColor(c.color); + gradientStopCollection.add(create(ctx, + '<GradientStop Color="%1" Offset="%2"/>', [color, c.offset])); + } + }; + + function LinearCanvasGradient_(x0, y0, x1, y1) { + CanvasGradient_.call(this); + this.x0_ = x0; + this.y0_ = y0; + this.x1_ = x1; + this.y1_ = y1; + } + LinearCanvasGradient_.prototype = new CanvasGradient_; + + LinearCanvasGradient_.prototype.createBrush_ = function(ctx) { + var brushObj = create(ctx, '<LinearGradientBrush MappingMode="Absolute" ' + + 'StartPoint="%1,%2" EndPoint="%3,%4"/>', + [this.x0_, this.y0_, this.x1_, this.y1_]); + this.createStops_(ctx, brushObj, this.colors_); + return brushObj; + }; + + function isNanOrInfinite(v) { + return isNaN(v) || !isFinite(v); + } + + function RadialCanvasGradient_(x0, y0, r0, x1, y1, r1) { + if (r0 < 0 || r1 < 0 || isNanOrInfinite(x0) || isNanOrInfinite(y0) || + isNanOrInfinite(x1) || isNanOrInfinite(y1)) { + // IE does not support DOMException so this is as close as we get. + var error = Error('DOMException.INDEX_SIZE_ERR'); + error.code = 1; + throw error; + } + + CanvasGradient_.call(this); + this.x0_ = x0; + this.y0_ = y0; + this.r0_ = r0; + this.x1_ = x1; + this.y1_ = y1; + this.r1_ = r1; + } + RadialCanvasGradient_.prototype = new CanvasGradient_; + + CanvasGradient_.prototype.createBrush_ = function(ctx) { + if (this.x0_ == this.x1_ && this.y0_ == this.y1_ && this.r0_ == this.r1_) { + return null; + } + + var radius = Math.max(this.r0_, this.r1_); + var minRadius = Math.min(this.r0_, this.r1_); + var brushObj = create(ctx, '<RadialGradientBrush MappingMode="Absolute" ' + + 'GradientOrigin="%1,%2" Center="%3,%4" ' + + 'RadiusX="%5" RadiusY="%5"/>', + [this.x0_, this.y0_, this.x1_, this.y1_, radius]); + + var colors = this.colors_.concat(); + + if (this.r1_ < this.r0_) { + // reverse color stop array + colors.reverse(); + for (var i = 0, c; c = colors[i]; i++) { + c.offset = 1 - c.offset; + } + } + + // sort the color stops + colors.sort(function(c1, c2) { + return c1.offset - c2.offset; + }); + + if (minRadius > 0) { + // We need to adjust the color stops since SL always have the inner radius + // at (0, 0) so we change the stops in case the min radius is not 0. + for (var i = 0, c; c = colors[i]; i++) { + c.offset = minRadius / radius + (radius - minRadius) / radius * c.offset; + } + } + + this.createStops_(ctx, brushObj, colors); + return brushObj; + }; + + function CanvasPattern_() {} + + // set up externs + G_vmlCanvasManager = G_vmlCanvasManager_; + CanvasRenderingContext2D = CanvasRenderingContext2D_; + CanvasGradient = CanvasGradient_; + CanvasPattern = CanvasPattern_; + +})(); + +} // if diff -r 99e223f6a132 -r 6eac08f7edcf static/scripts/packed/excanvas.js --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/static/scripts/packed/excanvas.js Fri Aug 22 17:44:32 2008 -0400 @@ -0,0 +1,1 @@ +if(!window.CanvasRenderingContext2D){(function(){var L;var N={init:function(d){var e=d||document;e.createElement("canvas");if(/MSIE/.test(navigator.userAgent)&&!window.opera){var 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