// 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 only support repeat. // * 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) // * Non uniform scaling does not correctly scale strokes. // * Filling very large shapes (above 5000 points) is buggy. // * Optimize. There is always room for speed improvements. // Only add this code if we do not already have a canvas implementation if (!document.createElement('canvas').getContext) { (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 abs = m.abs; var sqrt = m.sqrt; // this is used for sub pixel precision var Z = 10; var Z2 = Z / 2; /** * This funtion is assigned to the <canvas> elements as element.getContext(). * @this {HTMLElement} * @return {CanvasRenderingContext2D_} */ function getContext() { return this.context_ || (this.context_ = new CanvasRenderingContext2D_(this)); } var slice = Array.prototype.slice; /** * Binds a function to an object. The returned function will always use the * passed in {@code obj} as {@code this}. * * Example: * * g = bind(f, obj, a, b) * g(c, d) // will do f.call(obj, a, b, c, d) * * @param {Function} f The function to bind the object to * @param {Object} obj The object that should act as this when the function * is called * @param {*} var_args Rest arguments that will be used as the initial * arguments when the function is called * @return {Function} A new function that has bound this */ function bind(f, obj, var_args) { var a = slice.call(arguments, 2); return function() { return f.apply(obj, a.concat(slice.call(arguments))); }; } function encodeHtmlAttribute(s) { return String(s).replace(/&/g, '&').replace(/"/g, '"'); } function addNamespacesAndStylesheet(doc) { // create xmlns if (!doc.namespaces['g_vml_']) { doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml', '#default#VML'); } if (!doc.namespaces['g_o_']) { doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office', '#default#VML'); } // Setup default CSS. Only add one style sheet per document if (!doc.styleSheets['ex_canvas_']) { var ss = doc.createStyleSheet(); ss.owningElement.id = 'ex_canvas_'; ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + // default size is 300x150 in Gecko and Opera 'text-align:left;300px;height:150px}'; } } // Add namespaces and stylesheet at startup. addNamespacesAndStylesheet(document); var G_vmlCanvasManager_ = { init: function(opt_doc) { if (/MSIE/.test(navigator.userAgent) && !window.opera) { var doc = opt_doc || document; // Create a dummy element so that IE will allow canvas elements to be // recognized. doc.createElement('canvas'); doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); } }, init_: function(doc) { // find all canvas elements var els = doc.getElementsByTagName('canvas'); for (var i = 0; i < els.length; i++) { 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) { if (!el.getContext) { el.getContext = getContext; // Add namespaces and stylesheet to document of the element. addNamespacesAndStylesheet(el.ownerDocument); // Remove fallback content. There is no way to hide text nodes so we // just remove all childNodes. We could hide all elements and remove // text nodes but who really cares about the fallback content. el.innerHTML = ''; // 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.getContext().clearRect(); el.style.width = el.attributes.width.nodeValue + 'px'; // In IE8 this does not trigger onresize. el.firstChild.style.width = el.clientWidth + 'px'; break; case 'height': el.getContext().clearRect(); el.style.height = el.attributes.height.nodeValue + 'px'; el.firstChild.style.height = el.clientHeight + 'px'; 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 decToHex = []; for (var i = 0; i < 16; i++) { for (var j = 0; j < 16; j++) { decToHex[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.globalAlpha = o1.globalAlpha; o2.font = o1.font; o2.textAlign = o1.textAlign; o2.textBaseline = o1.textBaseline; o2.arcScaleX_ = o1.arcScaleX_; o2.arcScaleY_ = o1.arcScaleY_; o2.lineScale_ = o1.lineScale_; } var colorData = { aliceblue: '#F0F8FF', antiquewhite: '#FAEBD7', aquamarine: '#7FFFD4', azure: '#F0FFFF', beige: '#F5F5DC', bisque: '#FFE4C4', black: '#000000', blanchedalmond: '#FFEBCD', blueviolet: '#8A2BE2', brown: '#A52A2A', burlywood: '#DEB887', cadetblue: '#5F9EA0', chartreuse: '#7FFF00', chocolate: '#D2691E', coral: '#FF7F50', cornflowerblue: '#6495ED', cornsilk: '#FFF8DC', crimson: '#DC143C', cyan: '#00FFFF', darkblue: '#00008B', darkcyan: '#008B8B', darkgoldenrod: '#B8860B', darkgray: '#A9A9A9', darkgreen: '#006400', darkgrey: '#A9A9A9', darkkhaki: '#BDB76B', darkmagenta: '#8B008B', darkolivegreen: '#556B2F', darkorange: '#FF8C00', darkorchid: '#9932CC', darkred: '#8B0000', darksalmon: '#E9967A', darkseagreen: '#8FBC8F', darkslateblue: '#483D8B', darkslategray: '#2F4F4F', darkslategrey: '#2F4F4F', darkturquoise: '#00CED1', darkviolet: '#9400D3', deeppink: '#FF1493', deepskyblue: '#00BFFF', dimgray: '#696969', dimgrey: '#696969', dodgerblue: '#1E90FF', firebrick: '#B22222', floralwhite: '#FFFAF0', forestgreen: '#228B22', gainsboro: '#DCDCDC', ghostwhite: '#F8F8FF', gold: '#FFD700', goldenrod: '#DAA520', grey: '#808080', greenyellow: '#ADFF2F', honeydew: '#F0FFF0', hotpink: '#FF69B4', indianred: '#CD5C5C', indigo: '#4B0082', ivory: '#FFFFF0', khaki: '#F0E68C', lavender: '#E6E6FA', lavenderblush: '#FFF0F5', lawngreen: '#7CFC00', lemonchiffon: '#FFFACD', lightblue: '#ADD8E6', lightcoral: '#F08080', lightcyan: '#E0FFFF', lightgoldenrodyellow: '#FAFAD2', lightgreen: '#90EE90', lightgrey: '#D3D3D3', lightpink: '#FFB6C1', lightsalmon: '#FFA07A', lightseagreen: '#20B2AA', lightskyblue: '#87CEFA', lightslategray: '#778899', lightslategrey: '#778899', lightsteelblue: '#B0C4DE', lightyellow: '#FFFFE0', limegreen: '#32CD32', linen: '#FAF0E6', magenta: '#FF00FF', mediumaquamarine: '#66CDAA', mediumblue: '#0000CD', mediumorchid: '#BA55D3', mediumpurple: '#9370DB', mediumseagreen: '#3CB371', mediumslateblue: '#7B68EE', mediumspringgreen: '#00FA9A', mediumturquoise: '#48D1CC', mediumvioletred: '#C71585', midnightblue: '#191970', mintcream: '#F5FFFA', mistyrose: '#FFE4E1', moccasin: '#FFE4B5', navajowhite: '#FFDEAD', oldlace: '#FDF5E6', olivedrab: '#6B8E23', orange: '#FFA500', orangered: '#FF4500', orchid: '#DA70D6', palegoldenrod: '#EEE8AA', palegreen: '#98FB98', paleturquoise: '#AFEEEE', palevioletred: '#DB7093', papayawhip: '#FFEFD5', peachpuff: '#FFDAB9', peru: '#CD853F', pink: '#FFC0CB', plum: '#DDA0DD', powderblue: '#B0E0E6', rosybrown: '#BC8F8F', royalblue: '#4169E1', saddlebrown: '#8B4513', salmon: '#FA8072', sandybrown: '#F4A460', seagreen: '#2E8B57', seashell: '#FFF5EE', sienna: '#A0522D', skyblue: '#87CEEB', slateblue: '#6A5ACD', slategray: '#708090', slategrey: '#708090', snow: '#FFFAFA', springgreen: '#00FF7F', steelblue: '#4682B4', tan: '#D2B48C', thistle: '#D8BFD8', tomato: '#FF6347', turquoise: '#40E0D0', violet: '#EE82EE', wheat: '#F5DEB3', whitesmoke: '#F5F5F5', yellowgreen: '#9ACD32' }; function getRgbHslContent(styleString) { var start = styleString.indexOf('(', 3); var end = styleString.indexOf(')', start + 1); var parts = styleString.substring(start + 1, end).split(','); // add alpha if needed if (parts.length == 4 && styleString.substr(3, 1) == 'a') { alpha = Number(parts[3]); } else { parts[3] = 1; } return parts; } function percent(s) { return parseFloat(s) / 100; } function clamp(v, min, max) { return Math.min(max, Math.max(min, v)); } function hslToRgb(parts){ var r, g, b; h = parseFloat(parts[0]) / 360 % 360; if (h < 0) h++; s = clamp(percent(parts[1]), 0, 1); l = clamp(percent(parts[2]), 0, 1); if (s == 0) { r = g = b = l; // achromatic } else { var q = l < 0.5 ? l * (1 + s) : l + s - l * s; var p = 2 * l - q; r = hueToRgb(p, q, h + 1 / 3); g = hueToRgb(p, q, h); b = hueToRgb(p, q, h - 1 / 3); } return '#' + decToHex[Math.floor(r * 255)] + decToHex[Math.floor(g * 255)] + decToHex[Math.floor(b * 255)]; } function hueToRgb(m1, m2, h) { if (h < 0) h++; if (h > 1) h--; if (6 * h < 1) return m1 + (m2 - m1) * 6 * h; else if (2 * h < 1) return m2; else if (3 * h < 2) return m1 + (m2 - m1) * (2 / 3 - h) * 6; else return m1; } function processStyle(styleString) { var str, alpha = 1; styleString = String(styleString); if (styleString.charAt(0) == '#') { str = styleString; } else if (/^rgb/.test(styleString)) { var parts = getRgbHslContent(styleString); var str = '#', n; for (var i = 0; i < 3; i++) { if (parts[i].indexOf('%') != -1) { n = Math.floor(percent(parts[i]) * 255); } else { n = Number(parts[i]); } str += decToHex[clamp(n, 0, 255)]; } alpha = parts[3]; } else if (/^hsl/.test(styleString)) { var parts = getRgbHslContent(styleString); str = hslToRgb(parts); alpha = parts[3]; } else { str = colorData[styleString] || styleString; } return {color: str, alpha: alpha}; } var DEFAULT_STYLE = { style: 'normal', variant: 'normal', weight: 'normal', size: 10, family: 'sans-serif' }; // Internal text style cache var fontStyleCache = {}; function processFontStyle(styleString) { if (fontStyleCache[styleString]) { return fontStyleCache[styleString]; } var el = document.createElement('div'); var style = el.style; try { style.font = styleString; } catch (ex) { // Ignore failures to set to invalid font. } return fontStyleCache[styleString] = { style: style.fontStyle || DEFAULT_STYLE.style, variant: style.fontVariant || DEFAULT_STYLE.variant, weight: style.fontWeight || DEFAULT_STYLE.weight, size: style.fontSize || DEFAULT_STYLE.size, family: style.fontFamily || DEFAULT_STYLE.family }; } function getComputedStyle(style, element) { var computedStyle = {}; for (var p in style) { computedStyle[p] = style[p]; } // Compute the size var canvasFontSize = parseFloat(element.currentStyle.fontSize), fontSize = parseFloat(style.size); if (typeof style.size == 'number') { computedStyle.size = style.size; } else if (style.size.indexOf('px') != -1) { computedStyle.size = fontSize; } else if (style.size.indexOf('em') != -1) { computedStyle.size = canvasFontSize * fontSize; } else if(style.size.indexOf('%') != -1) { computedStyle.size = (canvasFontSize / 100) * fontSize; } else if (style.size.indexOf('pt') != -1) { computedStyle.size = fontSize / .75; } else { computedStyle.size = canvasFontSize; } // Different scaling between normal text and VML text. This was found using // trial and error to get the same size as non VML text. computedStyle.size *= 0.981; return computedStyle; } function buildStyle(style) { return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + style.size + 'px ' + style.family; } 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.font = '10px sans-serif'; this.textAlign = 'left'; this.textBaseline = 'alphabetic'; 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; this.lineScale_ = 1; } var contextPrototype = CanvasRenderingContext2D_.prototype; contextPrototype.clearRect = function() { if (this.textMeasureEl_) { this.textMeasureEl_.removeNode(true); this.textMeasureEl_ = null; } this.element_.innerHTML = ''; }; contextPrototype.beginPath = function() { // TODO: Branch current matrix so that save/restore has no effect // as per safari docs. this.currentPath_ = []; }; contextPrototype.moveTo = function(aX, aY) { var p = this.getCoords_(aX, aY); this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); this.currentX_ = p.x; this.currentY_ = p.y; }; contextPrototype.lineTo = function(aX, aY) { var p = this.getCoords_(aX, aY); this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); this.currentX_ = p.x; this.currentY_ = p.y; }; contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, aCP2x, aCP2y, aX, aY) { var p = this.getCoords_(aX, aY); var cp1 = this.getCoords_(aCP1x, aCP1y); var cp2 = this.getCoords_(aCP2x, aCP2y); bezierCurveTo(this, cp1, cp2, p); }; // Helper function that takes the already fixed cordinates. function bezierCurveTo(self, cp1, cp2, p) { self.currentPath_.push({ type: 'bezierCurveTo', cp1x: cp1.x, cp1y: cp1.y, cp2x: cp2.x, cp2y: cp2.y, x: p.x, y: p.y }); self.currentX_ = p.x; self.currentY_ = p.y; } contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { // the following is lifted almost directly from // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes var cp = this.getCoords_(aCPx, aCPy); var p = this.getCoords_(aX, aY); var cp1 = { x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) }; var cp2 = { x: cp1.x + (p.x - this.currentX_) / 3.0, y: cp1.y + (p.y - this.currentY_) / 3.0 }; bezierCurveTo(this, cp1, cp2, p); }; contextPrototype.arc = function(aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise) { aRadius *= Z; var arcType = aClockwise ? 'at' : 'wa'; var xStart = aX + mc(aStartAngle) * aRadius - Z2; var yStart = aY + ms(aStartAngle) * aRadius - Z2; var xEnd = aX + mc(aEndAngle) * aRadius - Z2; var yEnd = aY + ms(aEndAngle) * aRadius - Z2; // IE won't render arches drawn counter clockwise if xStart == xEnd. if (xStart == xEnd && !aClockwise) { xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something // that can be represented in binary } var p = this.getCoords_(aX, aY); var pStart = this.getCoords_(xStart, yStart); var pEnd = this.getCoords_(xEnd, yEnd); this.currentPath_.push({type: arcType, x: p.x, y: p.y, radius: aRadius, xStart: pStart.x, yStart: pStart.y, xEnd: pEnd.x, yEnd: pEnd.y}); }; contextPrototype.rect = function(aX, aY, aWidth, aHeight) { this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); }; contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { var oldPath = this.currentPath_; this.beginPath(); this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); this.stroke(); this.currentPath_ = oldPath; }; contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { var oldPath = this.currentPath_; this.beginPath(); this.moveTo(aX, aY); this.lineTo(aX + aWidth, aY); this.lineTo(aX + aWidth, aY + aHeight); this.lineTo(aX, aY + aHeight); this.closePath(); this.fill(); this.currentPath_ = oldPath; }; contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { var gradient = new CanvasGradient_('gradient'); gradient.x0_ = aX0; gradient.y0_ = aY0; gradient.x1_ = aX1; gradient.y1_ = aY1; return gradient; }; contextPrototype.createRadialGradient = function(aX0, aY0, aR0, aX1, aY1, aR1) { var gradient = new CanvasGradient_('gradientradial'); gradient.x0_ = aX0; gradient.y0_ = aY0; gradient.r0_ = aR0; gradient.x1_ = aX1; gradient.y1_ = aY1; gradient.r1_ = aR1; return gradient; }; contextPrototype.drawImage = function(image, var_args) { var dx, dy, dw, dh, sx, sy, sw, sh; // to find the original width we overide the width and height var oldRuntimeWidth = image.runtimeStyle.width; var oldRuntimeHeight = image.runtimeStyle.height; image.runtimeStyle.width = 'auto'; image.runtimeStyle.height = 'auto'; // get the original size var w = image.width; var h = image.height; // and remove overides image.runtimeStyle.width = oldRuntimeWidth; image.runtimeStyle.height = oldRuntimeHeight; if (arguments.length == 3) { dx = arguments[1]; dy = arguments[2]; sx = sy = 0; sw = dw = w; sh = dh = h; } else if (arguments.length == 5) { dx = arguments[1]; dy = arguments[2]; dw = arguments[3]; dh = arguments[4]; sx = sy = 0; sw = w; sh = h; } else if (arguments.length == 9) { sx = arguments[1]; sy = arguments[2]; sw = arguments[3]; sh = arguments[4]; dx = arguments[5]; dy = arguments[6]; dw = arguments[7]; dh = arguments[8]; } else { throw Error('Invalid number of arguments'); } var d = 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="', W, 'px;height:', H, 'px;position:absolute;'); // If filters are necessary (rotation exists), create them // filters are bog-slow, so only create them if abbsolutely necessary // The following check doesn't account for skews (which don't exist // in the canvas spec (yet) anyway. if (this.m_[0][0] != 1 || this.m_[0][1] || this.m_[1][1] != 1 || this.m_[1][0]) { var filter = []; // Note the 12/21 reversal filter.push('M11=', this.m_[0][0], ',', 'M12=', this.m_[1][0], ',', 'M21=', this.m_[0][1], ',', 'M22=', this.m_[1][1], ',', 'Dx=', mr(d.x / Z), ',', 'Dy=', mr(d.y / Z), ''); // Bounding box calculation (need to minimize displayed area so that // filters don't waste time on unused pixels. var max = d; var c2 = this.getCoords_(dx + dw, dy); var c3 = this.getCoords_(dx, dy + dh); var c4 = this.getCoords_(dx + dw, dy + dh); max.x = m.max(max.x, c2.x, c3.x, c4.x); max.y = m.max(max.y, c2.y, c3.y, c4.y); vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', filter.join(''), ", sizingmethod='clip');"); } else { vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); } vmlStr.push(' ">' , '<g_vml_:image src="', image.src, '"', ' style="', Z * dw, 'px;', ' height:', Z * dh, 'px"', ' cropleft="', sx / w, '"', ' croptop="', sy / h, '"', ' cropright="', (w - sx - sw) / w, '"', ' cropbottom="', (h - sy - sh) / h, '"', ' />', '</g_vml_:group>'); this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); }; contextPrototype.stroke = function(aFill) { var W = 10; var H = 10; // Divide the shape into chunks if it's too long because IE has a limit // somewhere for how long a VML shape can be. This simple division does // not work with fills, only strokes, unfortunately. var chunkSize = 5000; var min = {x: null, y: null}; var max = {x: null, y: null}; for (var j = 0; j < this.currentPath_.length; j += chunkSize) { var lineStr = []; var lineOpen = false; lineStr.push('<g_vml_:shape', ' filled="', !!aFill, '"', ' style="position:absolute;', W, 'px;height:', H, 'px;"', ' coordorigin="0,0"', ' coordsize="', Z * W, ',', Z * H, '"', ' stroked="', !aFill, '"', ' path="'); var newSeq = false; for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { if (i % chunkSize == 0 && i > 0) { // move into position for next chunk lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); } var p = this.currentPath_[i]; var c; switch (p.type) { case 'moveTo': c = p; lineStr.push(' m ', mr(p.x), ',', mr(p.y)); break; case 'lineTo': lineStr.push(' l ', mr(p.x), ',', mr(p.y)); break; case 'close': lineStr.push(' x '); p = null; break; case 'bezierCurveTo': lineStr.push(' c ', mr(p.cp1x), ',', mr(p.cp1y), ',', mr(p.cp2x), ',', mr(p.cp2y), ',', mr(p.x), ',', mr(p.y)); break; case 'at': case 'wa': lineStr.push(' ', p.type, ' ', mr(p.x - this.arcScaleX_ * p.radius), ',', mr(p.y - this.arcScaleY_ * p.radius), ' ', mr(p.x + this.arcScaleX_ * p.radius), ',', mr(p.y + this.arcScaleY_ * p.radius), ' ', mr(p.xStart), ',', mr(p.yStart), ' ', mr(p.xEnd), ',', mr(p.yEnd)); break; } // TODO: Following is broken for curves due to // move to proper paths. // Figure out dimensions so we can do gradient fills // properly if (p) { if (min.x == null || p.x < min.x) { min.x = p.x; } if (max.x == null || p.x > max.x) { max.x = p.x; } if (min.y == null || p.y < min.y) { min.y = p.y; } if (max.y == null || p.y > max.y) { max.y = p.y; } } } lineStr.push(' ">'); if (!aFill) { appendStroke(this, lineStr); } else { appendFill(this, lineStr, min, max); } lineStr.push('</g_vml_:shape>'); this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); } }; function appendStroke(ctx, lineStr) { var a = processStyle(ctx.strokeStyle); var color = a.color; var opacity = a.alpha * ctx.globalAlpha; var lineWidth = ctx.lineScale_ * ctx.lineWidth; // VML cannot correctly render a line if the width is less than 1px. // In that case, we dilute the color to make the line look thinner. if (lineWidth < 1) { opacity *= lineWidth; } lineStr.push( '<g_vml_:stroke', ' opacity="', opacity, '"', ' joinstyle="', ctx.lineJoin, '"', ' miterlimit="', ctx.miterLimit, '"', ' endcap="', processLineCap(ctx.lineCap), '"', ' weight="', lineWidth, 'px"', ' color="', color, '" />' ); } function appendFill(ctx, lineStr, min, max) { var fillStyle = ctx.fillStyle; var arcScaleX = ctx.arcScaleX_; var arcScaleY = ctx.arcScaleY_; var width = max.x - min.x; var height = max.y - min.y; if (fillStyle instanceof CanvasGradient_) { // TODO: Gradients transformed with the transformation matrix. var angle = 0; var focus = {x: 0, y: 0}; // additional offset var shift = 0; // scale factor for offset var expansion = 1; if (fillStyle.type_ == 'gradient') { var x0 = fillStyle.x0_ / arcScaleX; var y0 = fillStyle.y0_ / arcScaleY; var x1 = fillStyle.x1_ / arcScaleX; var y1 = fillStyle.y1_ / arcScaleY; var p0 = ctx.getCoords_(x0, y0); var p1 = ctx.getCoords_(x1, y1); var dx = p1.x - p0.x; var dy = p1.y - p0.y; angle = Math.atan2(dx, dy) * 180 / Math.PI; // The angle should be a non-negative number. if (angle < 0) { angle += 360; } // Very small angles produce an unexpected result because they are // converted to a scientific notation string. if (angle < 1e-6) { angle = 0; } } else { var p0 = ctx.getCoords_(fillStyle.x0_, fillStyle.y0_); focus = { x: (p0.x - min.x) / width, y: (p0.y - min.y) / height }; width /= arcScaleX * Z; height /= arcScaleY * Z; var dimension = m.max(width, height); shift = 2 * fillStyle.r0_ / dimension; expansion = 2 * fillStyle.r1_ / dimension - shift; } // We need to sort the color stops in ascending order by offset, // otherwise IE won't interpret it correctly. var stops = fillStyle.colors_; stops.sort(function(cs1, cs2) { return cs1.offset - cs2.offset; }); var length = stops.length; var color1 = stops[0].color; var color2 = stops[length - 1].color; var opacity1 = stops[0].alpha * ctx.globalAlpha; var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; var colors = []; for (var i = 0; i < length; i++) { var stop = stops[i]; colors.push(stop.offset * expansion + shift + ' ' + stop.color); } // When colors attribute is used, the meanings of opacity and o:opacity2 // are reversed. lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', ' method="none" focus="100%"', ' color="', color1, '"', ' color2="', color2, '"', ' colors="', colors.join(','), '"', ' opacity="', opacity2, '"', ' g_o_:opacity2="', opacity1, '"', ' angle="', angle, '"', ' focusposition="', focus.x, ',', focus.y, '" />'); } else if (fillStyle instanceof CanvasPattern_) { if (width && height) { var deltaLeft = -min.x; var deltaTop = -min.y; lineStr.push('<g_vml_:fill', ' position="', deltaLeft / width * arcScaleX * arcScaleX, ',', deltaTop / height * arcScaleY * arcScaleY, '"', ' type="tile"', // TODO: Figure out the correct size to fit the scale. //' size="', w, 'px ', h, 'px"', ' src="', fillStyle.src_, '" />'); } } else { var a = processStyle(ctx.fillStyle); var color = a.color; var opacity = a.alpha * ctx.globalAlpha; lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, '" />'); } } contextPrototype.fill = function() { this.stroke(true); }; contextPrototype.closePath = function() { this.currentPath_.push({type: 'close'}); }; /** * @private */ contextPrototype.getCoords_ = function(aX, aY) { var m = this.m_; return { x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 }; }; contextPrototype.save = function() { var o = {}; copyState(this, o); this.aStack_.push(o); this.mStack_.push(this.m_); this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); }; contextPrototype.restore = function() { if (this.aStack_.length) { copyState(this.aStack_.pop(), this); this.m_ = this.mStack_.pop(); } }; function matrixIsFinite(m) { return isFinite(m[0][0]) && isFinite(m[0][1]) && isFinite(m[1][0]) && isFinite(m[1][1]) && isFinite(m[2][0]) && isFinite(m[2][1]); } function setM(ctx, m, updateLineScale) { if (!matrixIsFinite(m)) { return; } ctx.m_ = m; if (updateLineScale) { // Get the line scale. // Determinant of this.m_ means how much the area is enlarged by the // transformation. So its square root can be used as a scale factor // for width. var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; ctx.lineScale_ = sqrt(abs(det)); } } contextPrototype.translate = function(aX, aY) { var m1 = [ [1, 0, 0], [0, 1, 0], [aX, aY, 1] ]; setM(this, matrixMultiply(m1, this.m_), false); }; contextPrototype.rotate = function(aRot) { var c = mc(aRot); var s = ms(aRot); var m1 = [ [c, s, 0], [-s, c, 0], [0, 0, 1] ]; setM(this, matrixMultiply(m1, this.m_), false); }; contextPrototype.scale = function(aX, aY) { this.arcScaleX_ *= aX; this.arcScaleY_ *= aY; var m1 = [ [aX, 0, 0], [0, aY, 0], [0, 0, 1] ]; setM(this, matrixMultiply(m1, this.m_), true); }; contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { var m1 = [ [m11, m12, 0], [m21, m22, 0], [dx, dy, 1] ]; setM(this, matrixMultiply(m1, this.m_), true); }; contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { var m = [ [m11, m12, 0], [m21, m22, 0], [dx, dy, 1] ]; setM(this, m, true); }; /** * The text drawing function. * The maxWidth argument isn't taken in account, since no browser supports * it yet. */ contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { var m = this.m_, delta = 1000, left = 0, right = delta, offset = {x: 0, y: 0}, lineStr = []; var fontStyle = getComputedStyle(processFontStyle(this.font), this.element_); var fontStyleString = buildStyle(fontStyle); var elementStyle = this.element_.currentStyle; var textAlign = this.textAlign.toLowerCase(); switch (textAlign) { case 'left': case 'center': case 'right': break; case 'end': textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; break; case 'start': textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; break; default: textAlign = 'left'; } // 1.75 is an arbitrary number, as there is no info about the text baseline switch (this.textBaseline) { case 'hanging': case 'top': offset.y = fontStyle.size / 1.75; break; case 'middle': break; default: case null: case 'alphabetic': case 'ideographic': case 'bottom': offset.y = -fontStyle.size / 2.25; break; } switch(textAlign) { case 'right': left = delta; right = 0.05; break; case 'center': left = right = delta / 2; break; } var d = this.getCoords_(x + offset.x, y + offset.y); lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', ' coordsize="100 100" coordorigin="0 0"', ' filled="', !stroke, '" stroked="', !!stroke, '" style="position:absolute;1px;height:1px;">'); if (stroke) { appendStroke(this, lineStr); } else { // TODO: Fix the min and max params. appendFill(this, lineStr, {x: -left, y: 0}, {x: right, y: fontStyle.size}); } var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', ' offset="', skewOffset, '" origin="', left ,' 0" />', '<g_vml_:path textpathok="true" />', '<g_vml_:textpath on="true" string="', encodeHtmlAttribute(text), '" style="v-text-align:', textAlign, ';font:', encodeHtmlAttribute(fontStyleString), '" /></g_vml_:line>'); this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); }; contextPrototype.fillText = function(text, x, y, maxWidth) { this.drawText_(text, x, y, maxWidth, false); }; contextPrototype.strokeText = function(text, x, y, maxWidth) { this.drawText_(text, x, y, maxWidth, true); }; contextPrototype.measureText = function(text) { if (!this.textMeasureEl_) { var s = '<span style="position:absolute;' + 'top:-20000px;left:0;padding:0;margin:0;border:none;' + 'white-space:pre;"></span>'; this.element_.insertAdjacentHTML('beforeEnd', s); this.textMeasureEl_ = this.element_.lastChild; } var doc = this.element_.ownerDocument; this.textMeasureEl_.innerHTML = ''; this.textMeasureEl_.style.font = this.font; // Don't use innerHTML or innerText because they allow markup/whitespace. this.textMeasureEl_.appendChild(doc.createTextNode(text)); return { this.textMeasureEl_.offsetWidth}; }; /******** STUBS ********/ contextPrototype.clip = function() { // TODO: Implement }; contextPrototype.arcTo = function() { // TODO: Implement }; contextPrototype.createPattern = function(image, repetition) { return new CanvasPattern_(image, repetition); }; // Gradient / Pattern Stubs function CanvasGradient_(aType) { this.type_ = aType; this.x0_ = 0; this.y0_ = 0; this.r0_ = 0; this.x1_ = 0; this.y1_ = 0; this.r1_ = 0; this.colors_ = []; } CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { aColor = processStyle(aColor); this.colors_.push({offset: aOffset, color: aColor.color, alpha: aColor.alpha}); }; function CanvasPattern_(image, repetition) { assertImageIsValid(image); switch (repetition) { case 'repeat': case null: case '': this.repetition_ = 'repeat'; break case 'repeat-x': case 'repeat-y': case 'no-repeat': this.repetition_ = repetition; break; default: throwException('SYNTAX_ERR'); } this.src_ = image.src; this.width_ = image.width; this.height_ = image.height; } function throwException(s) { throw new DOMException_(s); } function assertImageIsValid(img) { if (!img || img.nodeType != 1 || img.tagName != 'IMG') { throwException('TYPE_MISMATCH_ERR'); } if (img.readyState != 'complete') { throwException('INVALID_STATE_ERR'); } } function DOMException_(s) { this.code = this[s]; this.message = s +': DOM Exception ' + this.code; } var p = DOMException_.prototype = new Error; p.INDEX_SIZE_ERR = 1; p.DOMSTRING_SIZE_ERR = 2; p.HIERARCHY_REQUEST_ERR = 3; p.WRONG_DOCUMENT_ERR = 4; p.INVALID_CHARACTER_ERR = 5; p.NO_DATA_ALLOWED_ERR = 6; p.NO_MODIFICATION_ALLOWED_ERR = 7; p.NOT_FOUND_ERR = 8; p.NOT_SUPPORTED_ERR = 9; p.INUSE_ATTRIBUTE_ERR = 10; p.INVALID_STATE_ERR = 11; p.SYNTAX_ERR = 12; p.INVALID_MODIFICATION_ERR = 13; p.NAMESPACE_ERR = 14; p.INVALID_ACCESS_ERR = 15; p.VALIDATION_ERR = 16; p.TYPE_MISMATCH_ERR = 17; // set up externs G_vmlCanvasManager = G_vmlCanvasManager_; CanvasRenderingContext2D = CanvasRenderingContext2D_; CanvasGradient = CanvasGradient_; CanvasPattern = CanvasPattern_; DOMException = DOMException_; })(); } // if