0,0 → 1,1415 |
// 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. |
// * 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;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) { |
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 = canvasFontSize * (4/3) * fontSize; |
} 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="width:', 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="width:', 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 lineStr = []; |
var lineOpen = false; |
|
var W = 10; |
var H = 10; |
|
lineStr.push('<g_vml_:shape', |
' filled="', !!aFill, '"', |
' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
' coordorigin="0,0"', |
' coordsize="', Z * W, ',', Z * H, '"', |
' stroked="', !aFill, '"', |
' 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]; |
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;width: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 {width: 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 |