From af26aaa53d073a7b2d25caee93e1cb5ceb2e099c Mon Sep 17 00:00:00 2001 From: Igor Sfiligoi Date: Fri, 23 Oct 2009 09:07:01 -0400 Subject: flot-0.6 --- excanvas.js | 823 ++++++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 663 insertions(+), 160 deletions(-) (limited to 'excanvas.js') diff --git a/excanvas.js b/excanvas.js index 367764b..c40d6f7 100644 --- a/excanvas.js +++ b/excanvas.js @@ -15,7 +15,7 @@ // Known Issues: // -// * Patterns are not implemented. +// * 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. @@ -29,6 +29,7 @@ // 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 @@ -83,6 +84,35 @@ if (!document.createElement('canvas').getContext) { }; } + 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;width: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) { @@ -95,29 +125,6 @@ if (!document.createElement('canvas').getContext) { }, init_: function(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;width:300px;height:150px}' + - 'g_vml_\\:*{behavior:url(#default#VML)}' + - 'g_o_\\:*{behavior:url(#default#VML)}'; - - } - // find all canvas elements var els = doc.getElementsByTagName('canvas'); for (var i = 0; i < els.length; i++) { @@ -135,9 +142,11 @@ if (!document.createElement('canvas').getContext) { */ 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. @@ -173,12 +182,15 @@ if (!document.createElement('canvas').getContext) { switch (e.propertyName) { case 'width': - el.style.width = el.attributes.width.nodeValue + 'px'; 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.style.height = el.attributes.height.nodeValue + 'px'; el.getContext().clearRect(); + el.style.height = el.attributes.height.nodeValue + 'px'; + el.firstChild.style.height = el.clientHeight + 'px'; break; } } @@ -194,10 +206,10 @@ if (!document.createElement('canvas').getContext) { G_vmlCanvasManager_.init(); // precompute "00" to "FF" - var dec2hex = []; + var decToHex = []; for (var i = 0; i < 16; i++) { for (var j = 0; j < 16; j++) { - dec2hex[i * 16 + j] = i.toString(16) + j.toString(16); + decToHex[i * 16 + j] = i.toString(16) + j.toString(16); } } @@ -238,33 +250,304 @@ if (!document.createElement('canvas').getContext) { 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.substring(0, 3) == 'rgb') { - var start = styleString.indexOf('(', 3); - var end = styleString.indexOf(')', start + 1); - var guts = styleString.substring(start + 1, end).split(','); - - str = '#'; + 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++) { - str += dec2hex[Number(guts[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}; + } - if (guts.length == 4 && styleString.substr(3, 1) == 'a') { - alpha = guts[3]; - } + 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 { - str = styleString; + computedStyle.size = canvasFontSize; } - return {color: str, alpha: alpha}; + // 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) { @@ -301,6 +584,9 @@ if (!document.createElement('canvas').getContext) { 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'); @@ -318,6 +604,10 @@ if (!document.createElement('canvas').getContext) { var contextPrototype = CanvasRenderingContext2D_.prototype; contextPrototype.clearRect = function() { + if (this.textMeasureEl_) { + this.textMeasureEl_.removeNode(true); + this.textMeasureEl_ = null; + } this.element_.innerHTML = ''; }; @@ -539,7 +829,8 @@ if (!document.createElement('canvas').getContext) { // 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]) { + 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 @@ -562,7 +853,8 @@ if (!document.createElement('canvas').getContext) { vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', - filter.join(''), ", sizingmethod='clip');") + filter.join(''), ", sizingmethod='clip');"); + } else { vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); } @@ -570,7 +862,7 @@ if (!document.createElement('canvas').getContext) { vmlStr.push(' ">' , '', ''); - this.element_.insertAdjacentHTML('BeforeEnd', - vmlStr.join('')); + 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.color; - var opacity = a.alpha * this.globalAlpha; - 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; - lineStr.push(''); + + if (!aFill) { + appendStroke(this, lineStr); + } else { + appendFill(this, lineStr, min, max); + } + + lineStr.push(''); + + this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); } - lineStr.push(' ">'); + }; - if (!aFill) { - var lineWidth = this.lineScale_ * this.lineWidth; + 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; - } + // 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( + '' + ); + } - lineStr.push( - '' - ); - } else if (typeof this.fillStyle == 'object') { - var fillStyle = this.fillStyle; + 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}; @@ -689,12 +1011,12 @@ if (!document.createElement('canvas').getContext) { var expansion = 1; if (fillStyle.type_ == 'gradient') { - var x0 = fillStyle.x0_ / this.arcScaleX_; - var y0 = fillStyle.y0_ / this.arcScaleY_; - var x1 = fillStyle.x1_ / this.arcScaleX_; - var y1 = fillStyle.y1_ / this.arcScaleY_; - var p0 = this.getCoords_(x0, y0); - var p1 = this.getCoords_(x1, y1); + 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; @@ -710,16 +1032,14 @@ if (!document.createElement('canvas').getContext) { angle = 0; } } else { - var p0 = this.getCoords_(fillStyle.x0_, fillStyle.y0_); - var width = max.x - min.x; - var height = max.y - min.y; + var p0 = ctx.getCoords_(fillStyle.x0_, fillStyle.y0_); focus = { x: (p0.x - min.x) / width, y: (p0.y - min.y) / height }; - width /= this.arcScaleX_ * Z; - height /= this.arcScaleY_ * Z; + width /= arcScaleX * Z; + height /= arcScaleY * Z; var dimension = m.max(width, height); shift = 2 * fillStyle.r0_ / dimension; expansion = 2 * fillStyle.r1_ / dimension - shift; @@ -735,8 +1055,8 @@ if (!document.createElement('canvas').getContext) { var length = stops.length; var color1 = stops[0].color; var color2 = stops[length - 1].color; - var opacity1 = stops[0].alpha * this.globalAlpha; - var opacity2 = stops[length - 1].alpha * this.globalAlpha; + var opacity1 = stops[0].alpha * ctx.globalAlpha; + var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; var colors = []; for (var i = 0; i < length; i++) { @@ -755,19 +1075,31 @@ if (!document.createElement('canvas').getContext) { ' 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(''); + } } else { + var a = processStyle(ctx.fillStyle); + var color = a.color; + var opacity = a.alpha * ctx.globalAlpha; lineStr.push(''); } - - lineStr.push(''); - - this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); - }; + } contextPrototype.fill = function() { this.stroke(true); - } + }; contextPrototype.closePath = function() { this.currentPath_.push({type: 'close'}); @@ -781,7 +1113,7 @@ if (!document.createElement('canvas').getContext) { 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() { @@ -793,19 +1125,16 @@ if (!document.createElement('canvas').getContext) { }; contextPrototype.restore = function() { - copyState(this.aStack_.pop(), this); - this.m_ = this.mStack_.pop(); + if (this.aStack_.length) { + copyState(this.aStack_.pop(), this); + this.m_ = this.mStack_.pop(); + } }; function matrixIsFinite(m) { - for (var j = 0; j < 3; j++) { - for (var k = 0; k < 2; k++) { - if (!isFinite(m[j][k]) || isNaN(m[j][k])) { - return false; - } - } - } - return true; + 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) { @@ -879,6 +1208,124 @@ if (!document.createElement('canvas').getContext) { 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(''); + + 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('', + '', + ''); + + 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 = ''; + 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 {width: this.textMeasureEl_.offsetWidth}; + }; + /******** STUBS ********/ contextPrototype.clip = function() { // TODO: Implement @@ -888,8 +1335,8 @@ if (!document.createElement('canvas').getContext) { // TODO: Implement }; - contextPrototype.createPattern = function() { - return new CanvasPattern_; + contextPrototype.createPattern = function(image, repetition) { + return new CanvasPattern_(image, repetition); }; // Gradient / Pattern Stubs @@ -911,14 +1358,70 @@ if (!document.createElement('canvas').getContext) { alpha: aColor.alpha}); }; - function CanvasPattern_() {} + 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 -- cgit v1.2.3