mirror of
https://port.numenaute.org/aleajactaest/khanat-opennel-code.git
synced 2024-11-10 09:19:01 +00:00
1427 lines
41 KiB
JavaScript
Executable file
1427 lines
41 KiB
JavaScript
Executable file
// Copyright 2006 Google Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
|
|
// Known Issues:
|
|
//
|
|
// * Patterns only support repeat.
|
|
// * Radial gradient are not implemented. The VML version of these look very
|
|
// different from the canvas one.
|
|
// * Clipping paths are not implemented.
|
|
// * Coordsize. The width and height attribute have higher priority than the
|
|
// width and height style values which isn't correct.
|
|
// * Painting mode isn't implemented.
|
|
// * Canvas width/height should is using content-box by default. IE in
|
|
// Quirks mode will draw the canvas using border-box. Either change your
|
|
// doctype to HTML5
|
|
// (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
|
|
// or use Box Sizing Behavior from WebFX
|
|
// (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
|
|
// * Non uniform scaling does not correctly scale strokes.
|
|
// * Filling very large shapes (above 5000 points) is buggy.
|
|
// * Optimize. There is always room for speed improvements.
|
|
|
|
// Only add this code if we do not already have a canvas implementation
|
|
if (!document.createElement('canvas').getContext) {
|
|
|
|
(function() {
|
|
|
|
// alias some functions to make (compiled) code shorter
|
|
var m = Math;
|
|
var mr = m.round;
|
|
var ms = m.sin;
|
|
var mc = m.cos;
|
|
var abs = m.abs;
|
|
var sqrt = m.sqrt;
|
|
|
|
// this is used for sub pixel precision
|
|
var Z = 10;
|
|
var Z2 = Z / 2;
|
|
|
|
/**
|
|
* This funtion is assigned to the <canvas> elements as element.getContext().
|
|
* @this {HTMLElement}
|
|
* @return {CanvasRenderingContext2D_}
|
|
*/
|
|
function getContext() {
|
|
return this.context_ ||
|
|
(this.context_ = new CanvasRenderingContext2D_(this));
|
|
}
|
|
|
|
var slice = Array.prototype.slice;
|
|
|
|
/**
|
|
* Binds a function to an object. The returned function will always use the
|
|
* passed in {@code obj} as {@code this}.
|
|
*
|
|
* Example:
|
|
*
|
|
* g = bind(f, obj, a, b)
|
|
* g(c, d) // will do f.call(obj, a, b, c, d)
|
|
*
|
|
* @param {Function} f The function to bind the object to
|
|
* @param {Object} obj The object that should act as this when the function
|
|
* is called
|
|
* @param {*} var_args Rest arguments that will be used as the initial
|
|
* arguments when the function is called
|
|
* @return {Function} A new function that has bound this
|
|
*/
|
|
function bind(f, obj, var_args) {
|
|
var a = slice.call(arguments, 2);
|
|
return function() {
|
|
return f.apply(obj, a.concat(slice.call(arguments)));
|
|
};
|
|
}
|
|
|
|
function encodeHtmlAttribute(s) {
|
|
return String(s).replace(/&/g, '&').replace(/"/g, '"');
|
|
}
|
|
|
|
function addNamespacesAndStylesheet(doc) {
|
|
// create xmlns
|
|
if (!doc.namespaces['g_vml_']) {
|
|
doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml',
|
|
'#default#VML');
|
|
|
|
}
|
|
if (!doc.namespaces['g_o_']) {
|
|
doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office',
|
|
'#default#VML');
|
|
}
|
|
|
|
// Setup default CSS. Only add one style sheet per document
|
|
if (!doc.styleSheets['ex_canvas_']) {
|
|
var ss = doc.createStyleSheet();
|
|
ss.owningElement.id = 'ex_canvas_';
|
|
ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
|
|
// default size is 300x150 in Gecko and Opera
|
|
'text-align:left;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 = fontSize / .75;
|
|
} else {
|
|
computedStyle.size = canvasFontSize;
|
|
}
|
|
|
|
// Different scaling between normal text and VML text. This was found using
|
|
// trial and error to get the same size as non VML text.
|
|
computedStyle.size *= 0.981;
|
|
|
|
return computedStyle;
|
|
}
|
|
|
|
function buildStyle(style) {
|
|
return style.style + ' ' + style.variant + ' ' + style.weight + ' ' +
|
|
style.size + 'px ' + style.family;
|
|
}
|
|
|
|
function processLineCap(lineCap) {
|
|
switch (lineCap) {
|
|
case 'butt':
|
|
return 'flat';
|
|
case 'round':
|
|
return 'round';
|
|
case 'square':
|
|
default:
|
|
return 'square';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This class implements CanvasRenderingContext2D interface as described by
|
|
* the WHATWG.
|
|
* @param {HTMLElement} surfaceElement The element that the 2D context should
|
|
* be associated with
|
|
*/
|
|
function CanvasRenderingContext2D_(surfaceElement) {
|
|
this.m_ = createMatrixIdentity();
|
|
|
|
this.mStack_ = [];
|
|
this.aStack_ = [];
|
|
this.currentPath_ = [];
|
|
|
|
// Canvas context properties
|
|
this.strokeStyle = '#000';
|
|
this.fillStyle = '#000';
|
|
|
|
this.lineWidth = 1;
|
|
this.lineJoin = 'miter';
|
|
this.lineCap = 'butt';
|
|
this.miterLimit = Z * 1;
|
|
this.globalAlpha = 1;
|
|
this.font = '10px sans-serif';
|
|
this.textAlign = 'left';
|
|
this.textBaseline = 'alphabetic';
|
|
this.canvas = surfaceElement;
|
|
|
|
var el = surfaceElement.ownerDocument.createElement('div');
|
|
el.style.width = surfaceElement.clientWidth + 'px';
|
|
el.style.height = surfaceElement.clientHeight + 'px';
|
|
el.style.overflow = 'hidden';
|
|
el.style.position = 'absolute';
|
|
surfaceElement.appendChild(el);
|
|
|
|
this.element_ = el;
|
|
this.arcScaleX_ = 1;
|
|
this.arcScaleY_ = 1;
|
|
this.lineScale_ = 1;
|
|
}
|
|
|
|
var contextPrototype = CanvasRenderingContext2D_.prototype;
|
|
contextPrototype.clearRect = function() {
|
|
if (this.textMeasureEl_) {
|
|
this.textMeasureEl_.removeNode(true);
|
|
this.textMeasureEl_ = null;
|
|
}
|
|
this.element_.innerHTML = '';
|
|
};
|
|
|
|
contextPrototype.beginPath = function() {
|
|
// TODO: Branch current matrix so that save/restore has no effect
|
|
// as per safari docs.
|
|
this.currentPath_ = [];
|
|
};
|
|
|
|
contextPrototype.moveTo = function(aX, aY) {
|
|
var p = this.getCoords_(aX, aY);
|
|
this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y});
|
|
this.currentX_ = p.x;
|
|
this.currentY_ = p.y;
|
|
};
|
|
|
|
contextPrototype.lineTo = function(aX, aY) {
|
|
var p = this.getCoords_(aX, aY);
|
|
this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y});
|
|
|
|
this.currentX_ = p.x;
|
|
this.currentY_ = p.y;
|
|
};
|
|
|
|
contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
|
|
aCP2x, aCP2y,
|
|
aX, aY) {
|
|
var p = this.getCoords_(aX, aY);
|
|
var cp1 = this.getCoords_(aCP1x, aCP1y);
|
|
var cp2 = this.getCoords_(aCP2x, aCP2y);
|
|
bezierCurveTo(this, cp1, cp2, p);
|
|
};
|
|
|
|
// Helper function that takes the already fixed cordinates.
|
|
function bezierCurveTo(self, cp1, cp2, p) {
|
|
self.currentPath_.push({
|
|
type: 'bezierCurveTo',
|
|
cp1x: cp1.x,
|
|
cp1y: cp1.y,
|
|
cp2x: cp2.x,
|
|
cp2y: cp2.y,
|
|
x: p.x,
|
|
y: p.y
|
|
});
|
|
self.currentX_ = p.x;
|
|
self.currentY_ = p.y;
|
|
}
|
|
|
|
contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
|
|
// the following is lifted almost directly from
|
|
// http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
|
|
|
|
var cp = this.getCoords_(aCPx, aCPy);
|
|
var p = this.getCoords_(aX, aY);
|
|
|
|
var cp1 = {
|
|
x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_),
|
|
y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_)
|
|
};
|
|
var cp2 = {
|
|
x: cp1.x + (p.x - this.currentX_) / 3.0,
|
|
y: cp1.y + (p.y - this.currentY_) / 3.0
|
|
};
|
|
|
|
bezierCurveTo(this, cp1, cp2, p);
|
|
};
|
|
|
|
contextPrototype.arc = function(aX, aY, aRadius,
|
|
aStartAngle, aEndAngle, aClockwise) {
|
|
aRadius *= Z;
|
|
var arcType = aClockwise ? 'at' : 'wa';
|
|
|
|
var xStart = aX + mc(aStartAngle) * aRadius - Z2;
|
|
var yStart = aY + ms(aStartAngle) * aRadius - Z2;
|
|
|
|
var xEnd = aX + mc(aEndAngle) * aRadius - Z2;
|
|
var yEnd = aY + ms(aEndAngle) * aRadius - Z2;
|
|
|
|
// IE won't render arches drawn counter clockwise if xStart == xEnd.
|
|
if (xStart == xEnd && !aClockwise) {
|
|
xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
|
|
// that can be represented in binary
|
|
}
|
|
|
|
var p = this.getCoords_(aX, aY);
|
|
var pStart = this.getCoords_(xStart, yStart);
|
|
var pEnd = this.getCoords_(xEnd, yEnd);
|
|
|
|
this.currentPath_.push({type: arcType,
|
|
x: p.x,
|
|
y: p.y,
|
|
radius: aRadius,
|
|
xStart: pStart.x,
|
|
yStart: pStart.y,
|
|
xEnd: pEnd.x,
|
|
yEnd: pEnd.y});
|
|
|
|
};
|
|
|
|
contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
|
|
this.moveTo(aX, aY);
|
|
this.lineTo(aX + aWidth, aY);
|
|
this.lineTo(aX + aWidth, aY + aHeight);
|
|
this.lineTo(aX, aY + aHeight);
|
|
this.closePath();
|
|
};
|
|
|
|
contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
|
|
var oldPath = this.currentPath_;
|
|
this.beginPath();
|
|
|
|
this.moveTo(aX, aY);
|
|
this.lineTo(aX + aWidth, aY);
|
|
this.lineTo(aX + aWidth, aY + aHeight);
|
|
this.lineTo(aX, aY + aHeight);
|
|
this.closePath();
|
|
this.stroke();
|
|
|
|
this.currentPath_ = oldPath;
|
|
};
|
|
|
|
contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
|
|
var oldPath = this.currentPath_;
|
|
this.beginPath();
|
|
|
|
this.moveTo(aX, aY);
|
|
this.lineTo(aX + aWidth, aY);
|
|
this.lineTo(aX + aWidth, aY + aHeight);
|
|
this.lineTo(aX, aY + aHeight);
|
|
this.closePath();
|
|
this.fill();
|
|
|
|
this.currentPath_ = oldPath;
|
|
};
|
|
|
|
contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
|
|
var gradient = new CanvasGradient_('gradient');
|
|
gradient.x0_ = aX0;
|
|
gradient.y0_ = aY0;
|
|
gradient.x1_ = aX1;
|
|
gradient.y1_ = aY1;
|
|
return gradient;
|
|
};
|
|
|
|
contextPrototype.createRadialGradient = function(aX0, aY0, aR0,
|
|
aX1, aY1, aR1) {
|
|
var gradient = new CanvasGradient_('gradientradial');
|
|
gradient.x0_ = aX0;
|
|
gradient.y0_ = aY0;
|
|
gradient.r0_ = aR0;
|
|
gradient.x1_ = aX1;
|
|
gradient.y1_ = aY1;
|
|
gradient.r1_ = aR1;
|
|
return gradient;
|
|
};
|
|
|
|
contextPrototype.drawImage = function(image, var_args) {
|
|
var dx, dy, dw, dh, sx, sy, sw, sh;
|
|
|
|
// to find the original width we overide the width and height
|
|
var oldRuntimeWidth = image.runtimeStyle.width;
|
|
var oldRuntimeHeight = image.runtimeStyle.height;
|
|
image.runtimeStyle.width = 'auto';
|
|
image.runtimeStyle.height = 'auto';
|
|
|
|
// get the original size
|
|
var w = image.width;
|
|
var h = image.height;
|
|
|
|
// and remove overides
|
|
image.runtimeStyle.width = oldRuntimeWidth;
|
|
image.runtimeStyle.height = oldRuntimeHeight;
|
|
|
|
if (arguments.length == 3) {
|
|
dx = arguments[1];
|
|
dy = arguments[2];
|
|
sx = sy = 0;
|
|
sw = dw = w;
|
|
sh = dh = h;
|
|
} else if (arguments.length == 5) {
|
|
dx = arguments[1];
|
|
dy = arguments[2];
|
|
dw = arguments[3];
|
|
dh = arguments[4];
|
|
sx = sy = 0;
|
|
sw = w;
|
|
sh = h;
|
|
} else if (arguments.length == 9) {
|
|
sx = arguments[1];
|
|
sy = arguments[2];
|
|
sw = arguments[3];
|
|
sh = arguments[4];
|
|
dx = arguments[5];
|
|
dy = arguments[6];
|
|
dw = arguments[7];
|
|
dh = arguments[8];
|
|
} else {
|
|
throw Error('Invalid number of arguments');
|
|
}
|
|
|
|
var d = this.getCoords_(dx, dy);
|
|
|
|
var w2 = sw / 2;
|
|
var h2 = sh / 2;
|
|
|
|
var vmlStr = [];
|
|
|
|
var W = 10;
|
|
var H = 10;
|
|
|
|
// For some reason that I've now forgotten, using divs didn't work
|
|
vmlStr.push(' <g_vml_:group',
|
|
' coordsize="', Z * W, ',', Z * H, '"',
|
|
' coordorigin="0,0"' ,
|
|
' style="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 W = 10;
|
|
var H = 10;
|
|
// Divide the shape into chunks if it's too long because IE has a limit
|
|
// somewhere for how long a VML shape can be. This simple division does
|
|
// not work with fills, only strokes, unfortunately.
|
|
var chunkSize = 5000;
|
|
|
|
var min = {x: null, y: null};
|
|
var max = {x: null, y: null};
|
|
|
|
for (var j = 0; j < this.currentPath_.length; j += chunkSize) {
|
|
var lineStr = [];
|
|
var lineOpen = false;
|
|
|
|
lineStr.push('<g_vml_:shape',
|
|
' filled="', !!aFill, '"',
|
|
' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
|
|
' coordorigin="0,0"',
|
|
' coordsize="', Z * W, ',', Z * H, '"',
|
|
' stroked="', !aFill, '"',
|
|
' path="');
|
|
|
|
var newSeq = false;
|
|
|
|
for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) {
|
|
if (i % chunkSize == 0 && i > 0) { // move into position for next chunk
|
|
lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y));
|
|
}
|
|
|
|
var p = this.currentPath_[i];
|
|
var c;
|
|
|
|
switch (p.type) {
|
|
case 'moveTo':
|
|
c = p;
|
|
lineStr.push(' m ', mr(p.x), ',', mr(p.y));
|
|
break;
|
|
case 'lineTo':
|
|
lineStr.push(' l ', mr(p.x), ',', mr(p.y));
|
|
break;
|
|
case 'close':
|
|
lineStr.push(' x ');
|
|
p = null;
|
|
break;
|
|
case 'bezierCurveTo':
|
|
lineStr.push(' c ',
|
|
mr(p.cp1x), ',', mr(p.cp1y), ',',
|
|
mr(p.cp2x), ',', mr(p.cp2y), ',',
|
|
mr(p.x), ',', mr(p.y));
|
|
break;
|
|
case 'at':
|
|
case 'wa':
|
|
lineStr.push(' ', p.type, ' ',
|
|
mr(p.x - this.arcScaleX_ * p.radius), ',',
|
|
mr(p.y - this.arcScaleY_ * p.radius), ' ',
|
|
mr(p.x + this.arcScaleX_ * p.radius), ',',
|
|
mr(p.y + this.arcScaleY_ * p.radius), ' ',
|
|
mr(p.xStart), ',', mr(p.yStart), ' ',
|
|
mr(p.xEnd), ',', mr(p.yEnd));
|
|
break;
|
|
}
|
|
|
|
|
|
// TODO: Following is broken for curves due to
|
|
// move to proper paths.
|
|
|
|
// Figure out dimensions so we can do gradient fills
|
|
// properly
|
|
if (p) {
|
|
if (min.x == null || p.x < min.x) {
|
|
min.x = p.x;
|
|
}
|
|
if (max.x == null || p.x > max.x) {
|
|
max.x = p.x;
|
|
}
|
|
if (min.y == null || p.y < min.y) {
|
|
min.y = p.y;
|
|
}
|
|
if (max.y == null || p.y > max.y) {
|
|
max.y = p.y;
|
|
}
|
|
}
|
|
}
|
|
lineStr.push(' ">');
|
|
|
|
if (!aFill) {
|
|
appendStroke(this, lineStr);
|
|
} else {
|
|
appendFill(this, lineStr, min, max);
|
|
}
|
|
|
|
lineStr.push('</g_vml_:shape>');
|
|
|
|
this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
|
|
}
|
|
};
|
|
|
|
function appendStroke(ctx, lineStr) {
|
|
var a = processStyle(ctx.strokeStyle);
|
|
var color = a.color;
|
|
var opacity = a.alpha * ctx.globalAlpha;
|
|
var lineWidth = ctx.lineScale_ * ctx.lineWidth;
|
|
|
|
// VML cannot correctly render a line if the width is less than 1px.
|
|
// In that case, we dilute the color to make the line look thinner.
|
|
if (lineWidth < 1) {
|
|
opacity *= lineWidth;
|
|
}
|
|
|
|
lineStr.push(
|
|
'<g_vml_:stroke',
|
|
' opacity="', opacity, '"',
|
|
' joinstyle="', ctx.lineJoin, '"',
|
|
' miterlimit="', ctx.miterLimit, '"',
|
|
' endcap="', processLineCap(ctx.lineCap), '"',
|
|
' weight="', lineWidth, 'px"',
|
|
' color="', color, '" />'
|
|
);
|
|
}
|
|
|
|
function appendFill(ctx, lineStr, min, max) {
|
|
var fillStyle = ctx.fillStyle;
|
|
var arcScaleX = ctx.arcScaleX_;
|
|
var arcScaleY = ctx.arcScaleY_;
|
|
var width = max.x - min.x;
|
|
var height = max.y - min.y;
|
|
if (fillStyle instanceof CanvasGradient_) {
|
|
// TODO: Gradients transformed with the transformation matrix.
|
|
var angle = 0;
|
|
var focus = {x: 0, y: 0};
|
|
|
|
// additional offset
|
|
var shift = 0;
|
|
// scale factor for offset
|
|
var expansion = 1;
|
|
|
|
if (fillStyle.type_ == 'gradient') {
|
|
var x0 = fillStyle.x0_ / arcScaleX;
|
|
var y0 = fillStyle.y0_ / arcScaleY;
|
|
var x1 = fillStyle.x1_ / arcScaleX;
|
|
var y1 = fillStyle.y1_ / arcScaleY;
|
|
var p0 = ctx.getCoords_(x0, y0);
|
|
var p1 = ctx.getCoords_(x1, y1);
|
|
var dx = p1.x - p0.x;
|
|
var dy = p1.y - p0.y;
|
|
angle = Math.atan2(dx, dy) * 180 / Math.PI;
|
|
|
|
// The angle should be a non-negative number.
|
|
if (angle < 0) {
|
|
angle += 360;
|
|
}
|
|
|
|
// Very small angles produce an unexpected result because they are
|
|
// converted to a scientific notation string.
|
|
if (angle < 1e-6) {
|
|
angle = 0;
|
|
}
|
|
} else {
|
|
var p0 = ctx.getCoords_(fillStyle.x0_, fillStyle.y0_);
|
|
focus = {
|
|
x: (p0.x - min.x) / width,
|
|
y: (p0.y - min.y) / height
|
|
};
|
|
|
|
width /= arcScaleX * Z;
|
|
height /= arcScaleY * Z;
|
|
var dimension = m.max(width, height);
|
|
shift = 2 * fillStyle.r0_ / dimension;
|
|
expansion = 2 * fillStyle.r1_ / dimension - shift;
|
|
}
|
|
|
|
// We need to sort the color stops in ascending order by offset,
|
|
// otherwise IE won't interpret it correctly.
|
|
var stops = fillStyle.colors_;
|
|
stops.sort(function(cs1, cs2) {
|
|
return cs1.offset - cs2.offset;
|
|
});
|
|
|
|
var length = stops.length;
|
|
var color1 = stops[0].color;
|
|
var color2 = stops[length - 1].color;
|
|
var opacity1 = stops[0].alpha * ctx.globalAlpha;
|
|
var opacity2 = stops[length - 1].alpha * ctx.globalAlpha;
|
|
|
|
var colors = [];
|
|
for (var i = 0; i < length; i++) {
|
|
var stop = stops[i];
|
|
colors.push(stop.offset * expansion + shift + ' ' + stop.color);
|
|
}
|
|
|
|
// When colors attribute is used, the meanings of opacity and o:opacity2
|
|
// are reversed.
|
|
lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"',
|
|
' method="none" focus="100%"',
|
|
' color="', color1, '"',
|
|
' color2="', color2, '"',
|
|
' colors="', colors.join(','), '"',
|
|
' opacity="', opacity2, '"',
|
|
' g_o_:opacity2="', opacity1, '"',
|
|
' angle="', angle, '"',
|
|
' focusposition="', focus.x, ',', focus.y, '" />');
|
|
} else if (fillStyle instanceof CanvasPattern_) {
|
|
if (width && height) {
|
|
var deltaLeft = -min.x;
|
|
var deltaTop = -min.y;
|
|
lineStr.push('<g_vml_:fill',
|
|
' position="',
|
|
deltaLeft / width * arcScaleX * arcScaleX, ',',
|
|
deltaTop / height * arcScaleY * arcScaleY, '"',
|
|
' type="tile"',
|
|
// TODO: Figure out the correct size to fit the scale.
|
|
//' size="', w, 'px ', h, 'px"',
|
|
' src="', fillStyle.src_, '" />');
|
|
}
|
|
} else {
|
|
var a = processStyle(ctx.fillStyle);
|
|
var color = a.color;
|
|
var opacity = a.alpha * ctx.globalAlpha;
|
|
lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity,
|
|
'" />');
|
|
}
|
|
}
|
|
|
|
contextPrototype.fill = function() {
|
|
this.stroke(true);
|
|
};
|
|
|
|
contextPrototype.closePath = function() {
|
|
this.currentPath_.push({type: 'close'});
|
|
};
|
|
|
|
/**
|
|
* @private
|
|
*/
|
|
contextPrototype.getCoords_ = function(aX, aY) {
|
|
var m = this.m_;
|
|
return {
|
|
x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2,
|
|
y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2
|
|
};
|
|
};
|
|
|
|
contextPrototype.save = function() {
|
|
var o = {};
|
|
copyState(this, o);
|
|
this.aStack_.push(o);
|
|
this.mStack_.push(this.m_);
|
|
this.m_ = matrixMultiply(createMatrixIdentity(), this.m_);
|
|
};
|
|
|
|
contextPrototype.restore = function() {
|
|
if (this.aStack_.length) {
|
|
copyState(this.aStack_.pop(), this);
|
|
this.m_ = this.mStack_.pop();
|
|
}
|
|
};
|
|
|
|
function matrixIsFinite(m) {
|
|
return isFinite(m[0][0]) && isFinite(m[0][1]) &&
|
|
isFinite(m[1][0]) && isFinite(m[1][1]) &&
|
|
isFinite(m[2][0]) && isFinite(m[2][1]);
|
|
}
|
|
|
|
function setM(ctx, m, updateLineScale) {
|
|
if (!matrixIsFinite(m)) {
|
|
return;
|
|
}
|
|
ctx.m_ = m;
|
|
|
|
if (updateLineScale) {
|
|
// Get the line scale.
|
|
// Determinant of this.m_ means how much the area is enlarged by the
|
|
// transformation. So its square root can be used as a scale factor
|
|
// for width.
|
|
var det = m[0][0] * m[1][1] - m[0][1] * m[1][0];
|
|
ctx.lineScale_ = sqrt(abs(det));
|
|
}
|
|
}
|
|
|
|
contextPrototype.translate = function(aX, aY) {
|
|
var m1 = [
|
|
[1, 0, 0],
|
|
[0, 1, 0],
|
|
[aX, aY, 1]
|
|
];
|
|
|
|
setM(this, matrixMultiply(m1, this.m_), false);
|
|
};
|
|
|
|
contextPrototype.rotate = function(aRot) {
|
|
var c = mc(aRot);
|
|
var s = ms(aRot);
|
|
|
|
var m1 = [
|
|
[c, s, 0],
|
|
[-s, c, 0],
|
|
[0, 0, 1]
|
|
];
|
|
|
|
setM(this, matrixMultiply(m1, this.m_), false);
|
|
};
|
|
|
|
contextPrototype.scale = function(aX, aY) {
|
|
this.arcScaleX_ *= aX;
|
|
this.arcScaleY_ *= aY;
|
|
var m1 = [
|
|
[aX, 0, 0],
|
|
[0, aY, 0],
|
|
[0, 0, 1]
|
|
];
|
|
|
|
setM(this, matrixMultiply(m1, this.m_), true);
|
|
};
|
|
|
|
contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) {
|
|
var m1 = [
|
|
[m11, m12, 0],
|
|
[m21, m22, 0],
|
|
[dx, dy, 1]
|
|
];
|
|
|
|
setM(this, matrixMultiply(m1, this.m_), true);
|
|
};
|
|
|
|
contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) {
|
|
var m = [
|
|
[m11, m12, 0],
|
|
[m21, m22, 0],
|
|
[dx, dy, 1]
|
|
];
|
|
|
|
setM(this, m, true);
|
|
};
|
|
|
|
/**
|
|
* The text drawing function.
|
|
* The maxWidth argument isn't taken in account, since no browser supports
|
|
* it yet.
|
|
*/
|
|
contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) {
|
|
var m = this.m_,
|
|
delta = 1000,
|
|
left = 0,
|
|
right = delta,
|
|
offset = {x: 0, y: 0},
|
|
lineStr = [];
|
|
|
|
var fontStyle = getComputedStyle(processFontStyle(this.font),
|
|
this.element_);
|
|
|
|
var fontStyleString = buildStyle(fontStyle);
|
|
|
|
var elementStyle = this.element_.currentStyle;
|
|
var textAlign = this.textAlign.toLowerCase();
|
|
switch (textAlign) {
|
|
case 'left':
|
|
case 'center':
|
|
case 'right':
|
|
break;
|
|
case 'end':
|
|
textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left';
|
|
break;
|
|
case 'start':
|
|
textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left';
|
|
break;
|
|
default:
|
|
textAlign = 'left';
|
|
}
|
|
|
|
// 1.75 is an arbitrary number, as there is no info about the text baseline
|
|
switch (this.textBaseline) {
|
|
case 'hanging':
|
|
case 'top':
|
|
offset.y = fontStyle.size / 1.75;
|
|
break;
|
|
case 'middle':
|
|
break;
|
|
default:
|
|
case null:
|
|
case 'alphabetic':
|
|
case 'ideographic':
|
|
case 'bottom':
|
|
offset.y = -fontStyle.size / 2.25;
|
|
break;
|
|
}
|
|
|
|
switch(textAlign) {
|
|
case 'right':
|
|
left = delta;
|
|
right = 0.05;
|
|
break;
|
|
case 'center':
|
|
left = right = delta / 2;
|
|
break;
|
|
}
|
|
|
|
var d = this.getCoords_(x + offset.x, y + offset.y);
|
|
|
|
lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ',
|
|
' coordsize="100 100" coordorigin="0 0"',
|
|
' filled="', !stroke, '" stroked="', !!stroke,
|
|
'" style="position:absolute;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
|