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674 COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+ Nothing in this License shall be construed as excluding or limiting
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+ 12. No Surrender of Others' Freedom.
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+ 17. Interpretation of Sections 15 and 16.
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
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+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+
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+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
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+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
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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.
+// * 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, '&amp;').replace(/"/g, '&quot;');
+ }
+
+ 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;');