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// 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.
// AMD by kener.linfeng@gmail.com
// Optimized by https://github.com/pissang
//
// NOTES http://jsperf.com/dom-attr-read-perf/2
// http://jsperf.com/arr-vs-obj-in-ie
define(function(require) {
// 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;
var IE_VERSION = +navigator.userAgent.match(/MSIE ([\d.]+)?/)[1];
var EPSILON = 1e-5;
var isAroundZero = function (val) {
return val > -EPSILON && val < EPSILON;
}
function isNotAroundZero(val) {
return val > EPSILON || val < -EPSILON;
}
/**
* 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 addNamespace(doc, prefix, urn) {
if (!doc.namespaces[prefix]) {
// NOTES, It will not work proply if add '#default#VML'
// When using appendChild to add dom
// doc.namespaces.add(prefix, urn, '#default#VML');
doc.namespaces.add(prefix, urn);
}
}
function addNamespacesAndStylesheet(doc) {
addNamespace(doc, 'g_vml_', 'urn:schemas-microsoft-com:vml');
addNamespace(doc, 'g_o_', 'urn:schemas-microsoft-com:office:office');
// 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);}';
}
}
function createVMLElement(tagName) {
// NOTES Why using createElement needs to add behavior:url(#default#VML) in style
var dom = document.createElement('<g_vml_:' + tagName + ' class="g_vml_">');
return dom;
}
// Add namespaces and stylesheet at startup.
addNamespacesAndStylesheet(document);
var G_vmlCanvasManager_ = {
init: function(opt_doc) {
var doc = opt_doc || document;
// Create a dummy element so that IE will allow canvas elements to be
// recognized.
doc.createElement('canvas');
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.strokeStyle = o1.strokeStyle;
o2.globalAlpha = o1.globalAlpha;
o2.font = o1.font;
o2.textAlign = o1.textAlign;
o2.textBaseline = o1.textBaseline;
o2.scaleX_ = o1.scaleX_;
o2.scaleY_ = o1.scaleY_;
o2.x_ = o1.x_;
o2.y_ = o1.y_;
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.charAt(3) != 'a') {
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, s, l;
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;
}
var processStyleCache = {};
function processStyle(styleString) {
if (styleString in processStyleCache) {
return processStyleCache[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 = +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 processStyleCache[styleString] = {color: str, alpha: alpha};
}
var DEFAULT_STYLE = {
style: 'normal',
variant: 'normal',
weight: 'normal',
size: 12, //10
family: '微软雅黑' //'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;
var fontFamily;
try {
style.font = styleString;
fontFamily = style.fontFamily.split(',')[0];
} 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: 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 + "'";
}
var lineCapMap = {
'butt': 'flat',
'round': 'round'
};
function processLineCap(lineCap) {
return lineCapMap[lineCap] || 'square';
}
function createShapeAttr() {
return {
filled: false,
stroked: false,
path: '',
fillStyle: null,
strokeStyle: null,
globalAlpha: 1,
lineCap: 'butt',
lineJoin: 'miter',
lineWidth: 1,
miterlimit: Z * 1,
x: 0,
y: 0
};
}
function copyShapeAttr(o1, o2) {
o1.path = o2.path;
o1.fillStyle = o2.fillStyle;
o1.globalAlpha = o2.globalAlpha;
// PENDING When shape changed from not stroked to stroked
if (o2.stroked) {
o1.strokeStyle = o2.strokeStyle;
o1.lineCap = o2.lineCap;
o1.lineJoin = o2.lineJoin;
o1.lineWidth = o2.lineWidth;
o1.miterlimit = o2.miterlimit;
}
o1.x = o2.x;
o1.y = o2.y;
o1.filled = o2.filled;
o1.stroked = o2.stroked;
}
function createTextAttr() {
var attr = createShapeAttr();
attr.text = '';
attr.font = '12px 微软雅黑';
attr.textAlign = 'left';
attr.textBaseline = 'alphabetic';
attr.offX = 0;
attr.offY = 0;
attr.maxWidth = 0;
return attr;
}
function copyTextAttr(o1, o2) {
copyShapeAttr(o1, o2);
o1.text = o2.text;
o1.font = o2.font;
o1.textAlign = o2.textAlign;
o1.textBaseline = o2.textBaseline;
o1.offX = o2.offX;
o1.offY = o2.offY;
o1.maxWidth = o2.maxWidth;
}
function createImageAttr() {
return {
image: '',
// position after tranformed
x: 0,
y: 0,
padding: '',
skewM: '',
cropped: false,
width: 0,
height: 0,
globalAlpha: 1
};
}
function copyImageAttr(o1, o2) {
o1.image = o2.image;
o1.x = o2.x;
o1.y = o2.y;
o1.width = o2.width;
o1.height = o2.height;
o1.globalAlpha = o2.globalAlpha;
if (o2.skewed) {
o1.skewM = o2.skewM;
o1.padding = o2.padding;
}
if (o2.cropped) {
o1.cropWidth = o2.cropWidth;
o1.cropHeight = o2.cropHeight;
o1.cropFilter = o2.cropFilter;
}
o1.cropped = o2.cropped;
o1.skewed = o2.skewed;
}
/**
* Virtual shape dom is created by stroke and fill operation.
* It will be cached in Context2D object. And created only if needed when redrawing
* @author https://github.com/pissang/
*/
function ShapeVirtualDom_() {
// this.rootEl_ = null;
// this.strokeEl_ = null;
// this.fillEl_ = null;
this.attr_ = createShapeAttr();
this.attrPrev_ = {};
}
ShapeVirtualDom_.prototype.attachTo = function (el) {
if (!this.attached_) {
var p = this.rootEl_.parentNode;
if (p !== el) {
el.appendChild(this.rootEl_);
}
}
this.attached_ = true;
}
ShapeVirtualDom_.prototype.detach = function () {
if (this.attached_) {
var p = this.rootEl_.parentNode;
if (p) {
p.removeChild(this.rootEl_);
}
}
this.attached_ = false;
}
ShapeVirtualDom_.prototype.getElement = function (path) {
if (!this.rootEl_) {
this.createShapeEl_(path);
}
var attr_ = this.attr_;
attr_.path = path;
attr_.filled = false;
attr_.stroked = false;
return this.rootEl_;
};
ShapeVirtualDom_.prototype.createShapeEl_ = function (path) {
var W = 10;
var H = 10;
var rootEl_ = createVMLElement('shape');
rootEl_.style.cssText = ['position:absolute;width:', W, 'px;height:', H, 'px'].join('');
rootEl_.coordorigin = '0 0';
rootEl_.coordsize = Z * W + ' ' + Z * H;
rootEl_.filled = 'false';
rootEl_.stroked = 'false';
this.rootEl_ = rootEl_;
};
ShapeVirtualDom_.prototype.isFilled = function () {
return this.attr_.filled;
};
ShapeVirtualDom_.prototype.isStroked = function () {
return this.attr_.stroked;
};
ShapeVirtualDom_.prototype.fill = function(ctx, min, max) {
var attr_ = this.attr_;
attr_.filled = true;
attr_.fillStyle = ctx.fillStyle;
attr_.globalAlpha = ctx.globalAlpha;
attr_.x = ctx.x_;
attr_.y = ctx.y_;
if (ctx.fillStyle instanceof CanvasGradient_) {
attr_.m_ = ctx.m_;
attr_.scaleX = ctx.scaleX_;
attr_.scaleY = ctx.scaleY_;
attr_.min = min;
attr_.max = max;
} else if (ctx.fillStyle instanceof CanvasPattern_) {
attr_.scaleX = ctx.scaleX_;
attr_.scaleY = ctx.scaleY_;
attr_.min = min;
attr_.max = max;
}
};
ShapeVirtualDom_.prototype.stroke = function (ctx) {
var attr_ = this.attr_;
attr_.stroked = true;
attr_.globalAlpha = ctx.globalAlpha;
attr_.lineCap = ctx.lineCap;
attr_.lineJoin = ctx.lineJoin;
attr_.lineWidth = ctx.lineWidth * ctx.lineScale_;
attr_.miterlimit = ctx.miterlimit;
attr_.strokeStyle = ctx.strokeStyle;
attr_.x = ctx.x_;
attr_.y = ctx.y_;
}
ShapeVirtualDom_.prototype.doFill_ = function () {
var attr_ = this.attr_;
var attrPrev_ = this.attrPrev_;
if (attr_.filled !== attrPrev_.filled) {
var rootEl_ = this.rootEl_;
if (attr_.filled) {
rootEl_.filled = 'true';
if (!this.fillEl_) {
this.fillEl_ = createVMLElement('fill');
// PENDING
// Set default attribute ?
}
rootEl_.appendChild(this.fillEl_);
} else {
rootEl_.filled = 'false';
if (this.fillEl_) {
rootEl_.removeChild(this.fillEl_);
}
}
}
if (!attr_.filled) {
return;
}
var fillEl_ = this.fillEl_;
var fillStyle = attr_.fillStyle;
if (
fillStyle !== attrPrev_.fillStyle ||
attr_.globalAlpha !== attrPrev_.globalAlpha
) {
// TODO Canvas gradient and pattern still not be optimized
// There problem when canvas gradient add color stop dynamically
//
// Text fill doesn't support Gradient or Pattern
if ((fillStyle instanceof CanvasGradient_) && attr_.min) {
// 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;
var scaleX = attr_.scaleX_;
var scaleY = attr_.scaleY_;
var min = attr_.min;
var max = attr_.max;
var width = max.x - min.x;
var height = max.y - min.y;
if (fillStyle.type_ == 'gradient') {
var x0 = fillStyle.x0_ / scaleX;
var y0 = fillStyle.y0_ / scaleY;
var x1 = fillStyle.x1_ / scaleX;
var y1 = fillStyle.y1_ / scaleY;
var p0 = getCoords(ctx, x0, y0);
var p1 = getCoords(ctx, 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 = getCoords(ctx, fillStyle.x0_, fillStyle.y0_);
focus = {
x: (p0.x - min.x) / width,
y: (p0.y - min.y) / height
};
width /= scaleX * Z;
height /= scaleY * 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 * attr_.globalAlpha;
var opacity2 = stops[length - 1].alpha * attr_.globalAlpha;
var colors = [];
for (var i = 0; i < length; i++) {
var stop = stops[i];
colors.push(stop.offset * expansion + shift + ' ' + stop.color);
}
fillEl_.type = fillStyle.type_;
fillEl_.method = 'none';
fillEl_.focus = '100%';
fillEl_.color = color1;
fillEl_.color2 = color2;
fillEl_.colors = colors.join(',');
fillEl_.opacity = opacity2;
fillEl_.setAttribute('g_o_:opacity2', opacity1);
fillEl_.angle = angle;
fillEl_.focusposition = focus.x + ',' + focus.y;
}
else if ((fillStyle instanceof CanvasPattern_) && attr_.min) {
if (width && height) {
var deltaLeft = -attr_.min.x;
var deltaTop = -attr_.min.y;
fillEl_.position = deltaLeft / width * scaleX * scaleX + ',' +
deltaTop / height * scaleY * scaleY;
fillEl_.type = 'tile';
fillEl_.src = fillStyle.src_;
}
}
else {
var a = processStyle(fillStyle);
var color = a.color;
var opacity = a.alpha * attr_.globalAlpha;
fillEl_.color = color;
if (opacity < 1) {
fillEl_.opacity = opacity;
}
}
}
};
ShapeVirtualDom_.prototype.doStroke_ = function () {
var attr_ = this.attr_;
var attrPrev_ = this.attrPrev_;
if (attr_.stroked !== attrPrev_.stroked) {
var rootEl_ = this.rootEl_;
if (attr_.stroked) {
if (!this.strokeEl_) {
this.strokeEl_ = createVMLElement('stroke');
// PENDING
// Set default attribute ?
}
rootEl_.stroked = 'true';
rootEl_.appendChild(this.strokeEl_);
} else {
rootEl_.stroked = 'false';
if (this.strokeEl_) {
rootEl_.removeChild(this.strokeEl_);
}
}
}
if (!attr_.stroked) {
return;
}
if (
attr_.strokeStyle !== attrPrev_.strokeStyle ||
attr_.globalAlpha !== attrPrev_.globalAlpha ||
attr_.lineWidth !== attrPrev_.lineWidth
) {
var a = processStyle(attr_.strokeStyle);
var opacity = a.alpha * attr_.globalAlpha;
var lineWidth = attr_.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;
}
if (opacity < 1) {
this.strokeEl_.opacity = opacity;
}
this.strokeEl_.color = a.color;
}
if (attr_.lineJoin !== attrPrev_.lineJoin) {
this.strokeEl_.joinstyle = attr_.lineJoin;
}
if (attr_.miterLimit !== attrPrev_.miterLimit) {
this.strokeEl_.miterlimit = attr_.miterLimit;
}
if (attr_.lineCap !== attrPrev_.lineCap) {
this.strokeEl_.endcap = processLineCap(attr_.lineCap);
}
if (lineWidth !== attrPrev_.lineWidth) {
this.strokeEl_.weight = lineWidth + 'px';
}
};
ShapeVirtualDom_.prototype.flush = function (ctx) {
var attr_ = this.attr_;
var attrPrev_ = this.attrPrev_;
if (attr_.x !== attrPrev_.x) {
this.rootEl_.style.left = attr_.x + 'px';
}
if (attr_.y !== attrPrev_.y) {
this.rootEl_.style.top = attr_.y + 'px';
}
if (attr_.path !== attrPrev_.path) {
this.rootEl_.path = attr_.path;
}
this.doFill_();
this.doStroke_();
copyShapeAttr(attrPrev_, attr_);
}
/**
* Virtual text dom is created by fillText and strokeText operation.
* It will be cached in Context2D object. And created only if needed when redrawing
* @author https://github.com/pissang/
*/
function TextVirtualDom_() {
// this.rootEl_ = null;
// this.skewEl_ = null;
// this.textPathEl_ = null;
// this.simpleRootEl_ = null;
this.attr_ = createTextAttr();
this.attrPrev_ = {};
}
TextVirtualDom_.prototype.getElement = function (ctx, text, x, y, maxWidth, stroke) {
if (!this.rootEl_) {
this.createEl_();
}
var m_ = ctx.m_;
var attr_ = this.attr_;
attr_.text = text;
attr_.sx = x;
attr_.sy = y;
attr_.maxWidth = maxWidth;
attr_.textAlign = ctx.textAlign;
attr_.textBaseline = ctx.textBaseline;
attr_.stroked = !!stroke;
attr_.filled = !stroke;
var fontStyle = getComputedStyle(processFontStyle(ctx.font),
ctx.element_);
var fontStyleString = buildStyle(fontStyle);
attr_.font = fontStyleString;
var offset = {x: 0, y: 0};
// 1.75 is an arbitrary number, as there is no info about the text baseline
switch (ctx.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;
}
var d = getCoords(ctx, x + offset.x, y + offset.y);
attr_.offX = d.x;
attr_.offY = d.y;
// attr_.skewed = isNotAroundZero(m_[0] - 1) || isNotAroundZero(m_[1]) ||
// isNotAroundZero(m_[3] - 1) || isNotAroundZero(m_[2])
attr_.skewM = m_[0][0].toFixed(3) + ',' + m_[1][0].toFixed(3) + ',' +
m_[0][1].toFixed(3) + ',' + m_[1][1].toFixed(3);
if (stroke) {
attr_.globalAlpha = ctx.globalAlpha;
attr_.lineCap = ctx.lineCap;
attr_.lineJoin = ctx.lineJoin;
attr_.lineWidth = ctx.lineWidth * ctx.lineScale_;
attr_.miterlimit = ctx.miterlimit;
attr_.strokeStyle = ctx.strokeStyle;
} else {
attr_.fillStyle = ctx.fillStyle;
attr_.globalAlpha = ctx.globalAlpha;
}
// TODO It is strange that flush after the rootEl has been appended to document
// SkewOffset like '10, 10'(which one item is not zero) will cause the shape disappeared.
this.flush(ctx);
return this.rootEl_;
};
TextVirtualDom_.prototype.createEl_ = function () {
var W = 10;
var H = 10;
this.rootEl_ = createVMLElement('line');
var rootEl_ = this.rootEl_;
rootEl_.coordsize = Z * W + ' ' + Z * H;
rootEl_.coordorigin = '0 0';
rootEl_.style.cssText = 'position:absolute;width:1px;height:1px';
rootEl_.stroked = 'false';
rootEl_.filled = 'false';
};
TextVirtualDom_.prototype.flush = function (ctx) {
var m_ = ctx.m_;
var delta = 1000;
var left = 0;
var right = delta;
var attr_ = this.attr_;
var attrPrev_ = this.attrPrev_;
var rootEl_ = this.rootEl_;
if (!this.skewEl_) {
this.skewEl_ = createVMLElement('skew');
this.skewEl_.on = 't';
this.textPathEl_ = createVMLElement('textpath');
this.pathEl_ = createVMLElement('path');
this.pathEl_.textpathok = 'true';
this.textPathEl_.on = 'true';
rootEl_.appendChild(this.skewEl_);
rootEl_.appendChild(this.pathEl_);
rootEl_.appendChild(this.textPathEl_);
}
var fontStyle = getComputedStyle(processFontStyle(this.attr_.font),
ctx.element_);
if (
attr_.font !== attrPrev_.font ||
attr_.text !== attrPrev_.text
) {
this.textPathEl_.string = encodeHtmlAttribute(attr_.text);
this.textPathEl_.style.font = encodeHtmlAttribute(attr_.font);
}
if (attr_.textAlign !== attrPrev_.textAlign) {
var elementStyle = ctx.element_.currentStyle;
var textAlign = attr_.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';
}
switch(textAlign) {
case 'right':
left = delta;
right = 0.05;
break;
case 'center':
left = right = delta / 2;
break;
}
rootEl_.from = -left + ' 0';
rootEl_.to = right + ' 0.05';
this.skewEl_.origin = left + ' 0';
this.textPathEl_.style['v-text-align'] = textAlign;
}
// if (attr_.skewed || stroke) {
if (attr_.skewM !== attrPrev_.skewM) {
this.skewEl_.matrix = attr_.skewM + ',0,0';
}
if (attr_.offX !== attrPrev_.offX ||
attr_.offY !== attrPrev_.offY
) {
var skewOffset = mr(attr_.offX / Z) + ',' + mr(attr_.offY / Z);
this.skewEl_.offset = skewOffset;
}
if (attr_.stroked) {
this.doStroke_();
} else {
this.doFill_();
}
copyTextAttr(attrPrev_, attr_);
// } else {
// if (!this.simpleRootEl_) {
// this.simpleRootEl_ = document.createElement('div');
// this.simpleRootEl_.style.position = 'absolute';
// }
// this.simpleRootEl_.style.font = encodeHtmlAttribute(fontStyleString);
// var a = processStyle(ctx.fillStyle);
// var color = a.color;
// var opacity = a.alpha * ctx.globalAlpha;
// this.simpleRootEl_.style.color = color;
// if (opacity < 1) {
// this.simpleRootEl_.style.filter = 'alpha(opacity=' + mr(opacity * 100) +')';
// }
// this.simpleRootEl_.innerHTML = text;
// switch (ctx.textBaseline) {
// case 'hanging':
// case 'top':
// this.simpleRootEl_.style.top = m_[2][1] + y + 'px';
// break;
// case 'middle':
// // TODO
// this.simpleRootEl_.style.top = m_[2][1] + y - fontStyle.size / 2.25 + 'px';
// break;
// default:
// case null:
// case 'alphabetic':
// case 'ideographic':
// case 'bottom':
// //
// this.simpleRootEl_.style.bottom = ctx.element_.clientHeight - m_[2][1] - y + 'px';
// break;
// }
// switch(textAlign) {
// case 'right':
// this.simpleRootEl_.style.right = ctx.element_.clientWidth - m_[2][0] - x + 'px';
// break;
// case 'center':
// // TODO
// this.simpleRootEl_.style.left = m_[2][0] + x - fontStyle.size / 4.5 * text.length + 'px';
// break;
// case 'left':
// this.simpleRootEl_.style.left = m_[2][0] + x + 'px';
// break;
// }
// return this.simpleRootEl_;
// }
}
TextVirtualDom_.prototype.doFill_ = ShapeVirtualDom_.prototype.doFill_;
TextVirtualDom_.prototype.doStroke_ = ShapeVirtualDom_.prototype.doStroke_;
TextVirtualDom_.prototype.attachTo = ShapeVirtualDom_.prototype.attachTo;
TextVirtualDom_.prototype.detach = ShapeVirtualDom_.prototype.detach;
/**
* Virtual image dom is created by drawImage operation.
* It will be cached in Context2D object. And created only if needed when redrawing
* @author https://github.com/pissang/
*
* TODO Image cropping testing
*/
function ImageVirtualDom_() {
// this.rootEl_ = null;
// this.cropEl_ = null;
// this.imageEl_ = null;
// this.groupEl_ = null;
this.attr_ = createImageAttr();
this.attrPrev_ = {};
};
ImageVirtualDom_.prototype.getElement = function (ctx, 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;
var m_ = ctx.m_;
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;
var args = Array.prototype.slice.call(arguments, 1);
var attr_ = this.attr_;
attr_.globalAlpha = ctx.globalAlpha;
var scaleX = ctx.scaleX_;
var scaleY = ctx.scaleY_;
if (args.length == 3) {
dx = args[1];
dy = args[2];
sx = sy = 0;
sw = dw = w;
sh = dh = h;
} else if (args.length == 5) {
dx = args[1];
dy = args[2];
dw = args[3];
dh = args[4];
sx = sy = 0;
sw = w;
sh = h;
} else if (args.length == 9) {
sx = args[1];
sy = args[2];
sw = args[3];
sh = args[4];
dx = args[5];
dy = args[6];
dw = args[7];
dh = args[8];
} else {
throw Error('Invalid number of arguments');
}
// Have rotation
attr_.skewed = m_[0][1] || m_[1][0];
if (attr_.skewed) {
var d = getCoords(ctx, dx, dy);
attr_.x = d.x;
attr_.y = d.y;
var filter = [];
filter.push('M11=', m_[0][0] / scaleX, ',',
'M12=', m_[1][0] / scaleY, ',',
'M21=', m_[0][1] / scaleX, ',',
'M22=', m_[1][1] / scaleY, ',',
'Dx=', d.x, ',',
'Dy=', d.y, '');
attr_.skewM = filter.join('');
// Bounding box calculation (need to minimize displayed area so that
// filters don't waste time on unused pixels.
var max = d;
var c2 = getCoords(ctx, dx + dw, dy);
var c3 = getCoords(ctx, dx, dy + dh);
var c4 = getCoords(ctx, 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);
attr_.padding = [0, Math.max(mr(max.x / Z), 0) + 'px', Math.max(mr(max.y / Z), 0) + 'px', 0].join(' ');
} else {
attr_.x = dx * scaleX + ctx.x_;
attr_.y = dy * scaleY + ctx.y_;
}
attr_.cropped = sx || sy;
if (attr_.cropped) {
attr_.cropWidth = Math.ceil((dw + sx * dw / sw) * scaleX);
attr_.cropHeight = Math.ceil((dh + sy * dh / sh) * scaleY);
attr_.cropFilter = 'progid:DxImageTransform.Microsoft.Matrix(Dx='
+ -dw / sw * scaleX * sx + ',Dy=' + -dh / sh * scaleY * sy + ')';
}
attr_.width = scaleX * dw / sw * w;
attr_.height = scaleY * dh / sh * h;
attr_.image = image.src;
if (!this.imageEl_) {
// NOTES
// Matrix of rootDom will not work if imageDom.style.position = 'absolute'
this.imageEl_ = document.createElement('img');
}
if (!(attr_.skewed || attr_.cropped)) {
this.rootEl_ = this.imageEl_;
} else if (attr_.skewed) {
if (!this.groupEl_) {
this.createGroupEl_();
}
this.rootEl_ = this.groupEl_;
} else {
if (!this.cropEl_) {
this.cropEl_ = document.createElement('div');
this.cropEl_.style.cssText = 'position:absolute; overflow:hidden;';
}
this.rootEl_ = this.cropEl_;
}
this.flush(ctx);
return this.rootEl_;
};
ImageVirtualDom_.prototype.createGroupEl_ = function () {
var W = 10;
var H = 10;
// For some reason that I've now forgotten, using divs didn't work
this.groupEl_ = createVMLElement('group');
this.groupEl_.coordsize = Z * W + ' ' + Z * H;
this.groupEl_.coordorigin = '0 0';
this.groupEl_.style.cssText = ['position:absolute;width:', W, 'px;height:', H, 'px'].join('');
}
ImageVirtualDom_.prototype.flush = function (ctx) {
var attr_ = this.attr_;
var attrPrev_ = this.attrPrev_;
var w2 = attr_.sw / 2;
var h2 = attr_.sh / 2;
var imageEl_ = this.imageEl_;
// 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 (!attr_.skewed && !attr_.cropped) {
if (attr_.x !== attrPrev_.x) {
imageEl_.style.left = attr_.x + 'px';
}
if (attr_.y !== attrPrev_.y) {
imageEl_.style.top = attr_.y + 'px';
}
if (!attrPrev_.skewed) {
imageEl_.style.position = 'absolute';
} else {
imageEl_.style.position = 'static';
}
} else if (attr_.skewed) {
var groupEl_ = this.groupEl_;
if (attr_.padding !== attrPrev_.padding) {
groupEl_.style.padding = attr_.padding;
}
if (attr_.skewM !== attrPrev_.skewM) {
groupEl_.style.filter = 'progid:DXImageTransform.Microsoft.Matrix('
+ attr_.skewM + ", SizingMethod='clip')";
}
if (attr_.cropped) {
if (!attrPrev_.cropped) {
groupEl_.appendChild(this.cropEl_);
this.cropEl_.appendChild(imageEl_);
}
} else {
if (!attrPrev_.skewed) {
groupEl_.appendChild(imageEl_);
}
}
} else if (attr_.cropped) {
if (!attrPrev_.cropped) {
this.cropEl_.appendChild(imageEl_);
}
}
// Draw a special cropping div if needed
if (attr_.cropped) {
var groupEl_ = this.groupEl_;
if (attr_.cropWidth !== attrPrev_.cropWidth) {
this.cropEl_.style.width = attr_.cropWidth + 'px';
}
if (attr_.cropHeight !== attrPrev_.cropHeight) {
this.cropEl_.style.height = attr_.cropHeight + 'px';
}
if (attr_.filter !== attrPrev_.filter) {
this.cropEl_.style.filter = attr_.filter;
}
}
if (attr_.width !== attrPrev_.width) {
imageEl_.style.width = attr_.width + 'px';
}
if (attr_.height !== attrPrev_.height) {
imageEl_.style.height = attr_.height + 'px';
}
if (attr_.image !== attrPrev_.image) {
imageEl_.src = attr_.image;
}
if (attr_.globalAlpha !== attrPrev_.globalAlpha) {
if (imageEl_.style.globalAlpha < 1) {
imageEl_.style.filter = 'alpha(opacity=' + mr(attr_.globalAlpha * 100) +')';
} else {
imageEl_.style.filter = '';
}
}
copyImageAttr(this.attrPrev_, this.attr_);
}
ImageVirtualDom_.prototype.attachTo = ShapeVirtualDom_.prototype.attachTo;
ImageVirtualDom_.prototype.detach = ShapeVirtualDom_.prototype.detach;
/**
* This class implements CanvasRenderingContext2D interface as described by
* the WHATWG.
* @param {HTMLElement} canvasElement The element that the 2D context should
* be associated with
*/
function CanvasRenderingContext2D_(canvasElement) {
this.m_ = createMatrixIdentity();
this.mStack_ = [];
this.aStack_ = [];
this.currentPath_ = [];
// NOTES
// http://louisremi.com/2009/03/30/changes-in-vml-for-ie8-or-what-feature-can-the-ie-dev-team-break-for-you-today/
// It is no longer possible to create a VML element outside of the DOM
// this.fragment_ = document.createDocumentFragment();
// Keep current drawed dom. So we can merge fill and stroke in one shape dom
this.currentVirtualDom_ = null;
// Cache the created dom
this.shapeVDomList_ = [];
this.textVDomList_ = [];
this.imageVDomList_ = [];
this.nShapeVEl_ = 0;
this.nTextVEl_ = 0;
this.nImageVEl_ = 0;
// 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.font = '12px 微软雅黑'; // 决定还是改这吧，影响代价最小
this.textAlign = 'left';
this.textBaseline = 'alphabetic';
this.canvas = canvasElement;
var cssText = 'width:' + canvasElement.clientWidth + 'px;height:' +
canvasElement.clientHeight + 'px;overflow:hidden;position:absolute';
var el = canvasElement.ownerDocument.createElement('div');
el.style.cssText = cssText;
canvasElement.appendChild(el);
var overlayEl = el.cloneNode(false);
// Use a non transparent background.
overlayEl.style.backgroundColor = '#fff'; //red, I don't know why, it work!
overlayEl.style.filter = 'alpha(opacity=0)';
canvasElement.appendChild(overlayEl);
this.element_ = el;
this.scaleX_ = 1;
this.scaleY_ = 1;
this.lineScale_ = 1;
this.ghost_ = document.createElement('div');
var cssText = 'position:absolute; left:0px; right: 0px; top: 0px; bottom: 0px;';
this.ghost_.style.cssText = cssText;
this.element_.appendChild(this.ghost_);
this.x_ = 0;
this.y_ = 0;
}
var contextPrototype = CanvasRenderingContext2D_.prototype;
contextPrototype.clearRect = function() {
if (this.textMeasureEl_) {
this.textMeasureEl_.removeNode(true);
this.textMeasureEl_ = null;
}
// var ghost_ = this.ghost_;
// Hide everything
this.ghost_.style.display = 'none';
// NOTES: Using innerHTML = '' will cause all descendant elements detached
// while (ghost_.firstChild) {
// ghost_.removeChild(ghost_.firstChild);
// }
// NOTES: removeChild in IE8 will not set the parentNode to null
//
// TODO Remove ghost element before change the attributes of children each frame is even more slow
// if (ghost_.parentNode === this.element_) {
// this.element_.removeChild(ghost_);
// }
this.currentVirtualDom_ = null;
this.nShapeVEl_ = 0;
this.nTextVEl_ = 0;
this.nImageVEl_ = 0;
};
contextPrototype.flush = function () {
for (var i = 0; i < this.nShapeVEl_; i++) {
this.shapeVDomList_[i].flush(this);
}
// Show everything
this.ghost_.style.display = 'block';
for (var i = this.nShapeVEl_, len = this.shapeVDomList_.length; i < len; i++) {
this.shapeVDomList_[i].detach();
}
for (var i = this.nImageVEl_, len = this.imageVDomList_.length; i < len; i++) {
this.imageVDomList_[i].detach();
}
for (var i = this.nTextVEl_, len = this.textVDomList_.length; i < len; i++) {
this.textVDomList_[i].detach();
}
this.shapeVDomList_.length = this.nShapeVEl_;
this.imageVDomList_.length = this.nImageVEl_;
this.textVDomList_.length = this.nTextVEl_;
// this.element_.appendChild(this.ghost_);
}
contextPrototype.beginPath = function() {
// TODO: Branch current matrix so that save/restore has no effect
// as per safari docs.
this.currentPath_ = [];
this.currentVirtualDom_ = null;
};
contextPrototype.moveTo = function(aX, aY) {
var p = getSkewedCoords(this, aX, aY);
p.type = 'moveTo';
this.currentPath_.push(p);
this.currentX_ = p.x;
this.currentY_ = p.y;
};
contextPrototype.lineTo = function(aX, aY) {
var p = getSkewedCoords(this, aX, aY);
p.type = 'lineTo';
this.currentPath_.push(p);
this.currentX_ = p.x;
this.currentY_ = p.y;
this.currentVirtualDom_ = null;
};
contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
aCP2x, aCP2y,
aX, aY) {
var p = getSkewedCoords(this, aX, aY);
var cp1 = getSkewedCoords(this, aCP1x, aCP1y);
var cp2 = getSkewedCoords(this, aCP2x, aCP2y);
bezierCurveTo(this, cp1, cp2, p);
this.currentVirtualDom_ = null;
};
// 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;
this.currentVirtualDom_ = null;
}
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 = getSkewedCoords(this, aCPx, aCPy);
var p = getSkewedCoords(this, 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);
this.currentVirtualDom_ = null;
};
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 = getSkewedCoords(this, aX, aY);
var pStart = getSkewedCoords(this, xStart, yStart);
var pEnd = getSkewedCoords(this, 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});
this.currentVirtualDom_ = null;
};
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();
this.currentVirtualDom_ = null;
};
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 vDom = this.imageVDomList_[this.nImageVEl_];
if (!vDom) {
vDom = new ImageVirtualDom_();
this.imageVDomList_[this.nImageVEl_] = vDom;
}
this.nImageVEl_++;
var args = Array.prototype.slice.call(arguments);
args.unshift(this);
var el = vDom.getElement.apply(vDom, args);
vDom.attachTo(this.ghost_);
this.currentVirtualDom_ = null;
};
contextPrototype.stroke = function(aFill) {
if (this.currentVirtualDom_) {
// Simply append fill or stroke dom
if (aFill && !this.currentVirtualDom_.isFilled()) {
this.currentVirtualDom_.fill(this);
} else if (!aFill && !this.currentVirtualDom_.isStroked()) {
this.currentVirtualDom_.stroke(this);
}
return;
}
var pathStr = [];
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;
pathStr.push(' m ', mr(p.x), ',', mr(p.y));
break;
case 'lineTo':
pathStr.push(' l ', mr(p.x), ',', mr(p.y));
break;
case 'close':
pathStr.push(' x ');
p = null;
break;
case 'bezierCurveTo':
pathStr.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':
pathStr.push(' ', p.type, ' ',
mr(p.x - this.scaleX_ * p.radius), ',',
mr(p.y - this.scaleY_ * p.radius), ' ',
mr(p.x + this.scaleX_ * p.radius), ',',
mr(p.y + this.scaleY_ * 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;
}
}
}
pathStr = pathStr.join('');
var vDom = this.shapeVDomList_[this.nShapeVEl_];
if (!vDom) {
vDom = new ShapeVirtualDom_();
this.shapeVDomList_[this.nShapeVEl_] = vDom;
}
this.nShapeVEl_++;
var shapeEl = vDom.getElement(pathStr, this.x_, this.y_);
aFill ? vDom.fill(this, min, max) : vDom.stroke(this);
vDom.attachTo(this.ghost_);
this.currentVirtualDom_ = vDom;
return shapeEl;
};
contextPrototype.fill = function() {
return this.stroke(true);
};
contextPrototype.closePath = function() {
this.currentPath_.push({type: 'close'});
};
function getCoords(ctx, aX, aY) {
var m = ctx.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
};
};
function getSkewedCoords(ctx, aX, aY) {
var m = ctx.m_;
return {
x: Z * (aX * m[0][0] + aY * m[1][0]) - Z2,
y: Z * (aX * m[0][1] + aY * m[1][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;
ctx.scaleX_ = Math.sqrt(m[0][0] * m[0][0] + m[0][1] * m[0][1]);
ctx.scaleY_ = Math.sqrt(m[1][0] * m[1][0] + m[1][1] * m[1][1]);
ctx.x_ = m[2][0];
ctx.y_ = m[2][1];
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) {
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 vDom = this.textVDomList_[this.nTextVEl_];
if (!vDom) {
vDom = new TextVirtualDom_();
this.textVDomList_[this.nTextVEl_] = vDom;
}
this.nTextVEl_++;
var el = vDom.getElement(this, text, x, y, maxWidth, stroke);
vDom.attachTo(this.ghost_);
this.currentVirtualDom_ = null;
};
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
else { // make the canvas test simple by kener.linfeng@gmail.com
G_vmlCanvasManager = false;
}
return G_vmlCanvasManager;
}); // define