+++ /dev/null
-// 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 are not implemented.
-// * Radial gradient are not implemented. The VML version of these look very
-// different from the canvas one.
-// * Clipping paths are not implemented.
-// * Coordsize. The width and height attribute have higher priority than the
-// width and height style values which isn't correct.
-// * Painting mode isn't implemented.
-// * Canvas width/height should is using content-box by default. IE in
-// Quirks mode will draw the canvas using border-box. Either change your
-// doctype to HTML5
-// (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
-// or use Box Sizing Behavior from WebFX
-// (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
-// * Non uniform scaling does not correctly scale strokes.
-// * Optimize. There is always room for speed improvements.
-
-// Only add this code if we do not already have a canvas implementation
-if (!document.createElement('canvas').getContext) {
-
-(function() {
-
- // alias some functions to make (compiled) code shorter
- var m = Math;
- var mr = m.round;
- var ms = m.sin;
- var mc = m.cos;
- var abs = m.abs;
- var sqrt = m.sqrt;
-
- // this is used for sub pixel precision
- var Z = 10;
- var Z2 = Z / 2;
-
- /**
- * This funtion is assigned to the <canvas> elements as element.getContext().
- * @this {HTMLElement}
- * @return {CanvasRenderingContext2D_}
- */
- function getContext() {
- return this.context_ ||
- (this.context_ = new CanvasRenderingContext2D_(this));
- }
-
- var slice = Array.prototype.slice;
-
- /**
- * Binds a function to an object. The returned function will always use the
- * passed in {@code obj} as {@code this}.
- *
- * Example:
- *
- * g = bind(f, obj, a, b)
- * g(c, d) // will do f.call(obj, a, b, c, d)
- *
- * @param {Function} f The function to bind the object to
- * @param {Object} obj The object that should act as this when the function
- * is called
- * @param {*} var_args Rest arguments that will be used as the initial
- * arguments when the function is called
- * @return {Function} A new function that has bound this
- */
- function bind(f, obj, var_args) {
- var a = slice.call(arguments, 2);
- return function() {
- return f.apply(obj, a.concat(slice.call(arguments)));
- };
- }
-
- 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) {
- // create xmlns
- if (!doc.namespaces['g_vml_']) {
- doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml',
- '#default#VML');
-
- }
- if (!doc.namespaces['g_o_']) {
- doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office',
- '#default#VML');
- }
-
- // Setup default CSS. Only add one style sheet per document
- if (!doc.styleSheets['ex_canvas_']) {
- var ss = doc.createStyleSheet();
- ss.owningElement.id = 'ex_canvas_';
- ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
- // default size is 300x150 in Gecko and Opera
- 'text-align:left;width:300px;height:150px}' +
- 'g_vml_\\:*{behavior:url(#default#VML)}' +
- 'g_o_\\:*{behavior:url(#default#VML)}';
-
- }
-
- // find all canvas elements
- var els = doc.getElementsByTagName('canvas');
- for (var i = 0; i < els.length; i++) {
- 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;
-
- // 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.style.width = el.attributes.width.nodeValue + 'px';
- el.getContext().clearRect();
- break;
- case 'height':
- el.style.height = el.attributes.height.nodeValue + 'px';
- el.getContext().clearRect();
- 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 dec2hex = [];
- for (var i = 0; i < 16; i++) {
- for (var j = 0; j < 16; j++) {
- dec2hex[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.arcScaleX_ = o1.arcScaleX_;
- o2.arcScaleY_ = o1.arcScaleY_;
- o2.lineScale_ = o1.lineScale_;
- }
-
- function processStyle(styleString) {
- var str, alpha = 1;
-
- styleString = String(styleString);
- if (styleString.substring(0, 3) == 'rgb') {
- var start = styleString.indexOf('(', 3);
- var end = styleString.indexOf(')', start + 1);
- var guts = styleString.substring(start + 1, end).split(',');
-
- str = '#';
- for (var i = 0; i < 3; i++) {
- str += dec2hex[Number(guts[i])];
- }
-
- if (guts.length == 4 && styleString.substr(3, 1) == 'a') {
- alpha = guts[3];
- }
- } else {
- str = styleString;
- }
-
- return {color: str, alpha: alpha};
- }
-
- 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.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() {
- this.element_.innerHTML = '';
- this.currentPath_ = [];
- };
-
- 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) {
- // Will destroy any existing path (same as FF behaviour)
- 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_ = [];
- };
-
- contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
- // Will destroy any existing path (same as FF behaviour)
- 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_ = [];
- };
-
- 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]) {
- var filter = [];
-
- // Note the 12/21 reversal
- filter.push('M11=', this.m_[0][0], ',',
- 'M12=', this.m_[1][0], ',',
- 'M21=', this.m_[0][1], ',',
- 'M22=', this.m_[1][1], ',',
- 'Dx=', mr(d.x / Z), ',',
- 'Dy=', mr(d.y / Z), '');
-
- // Bounding box calculation (need to minimize displayed area so that
- // filters don't waste time on unused pixels.
- var max = d;
- var c2 = this.getCoords_(dx + dw, dy);
- var c3 = this.getCoords_(dx, dy + dh);
- var c4 = this.getCoords_(dx + dw, dy + dh);
-
- max.x = m.max(max.x, c2.x, c3.x, c4.x);
- max.y = m.max(max.y, c2.y, c3.y, c4.y);
-
- vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z),
- 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
- filter.join(''), ", sizingmethod='clip');")
- } else {
- vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;');
- }
-
- vmlStr.push(' ">' ,
- '<g_vml_:image src="', image.src, '"',
- ' style="width:', Z * dw, 'px;',
- ' height:', Z * dh, 'px;"',
- ' cropleft="', sx / w, '"',
- ' croptop="', sy / h, '"',
- ' cropright="', (w - sx - sw) / w, '"',
- ' cropbottom="', (h - sy - sh) / h, '"',
- ' />',
- '</g_vml_:group>');
-
- this.element_.insertAdjacentHTML('BeforeEnd',
- vmlStr.join(''));
- };
-
- contextPrototype.stroke = function(aFill) {
- var lineStr = [];
- var lineOpen = false;
- var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
- var color = a.color;
- var opacity = a.alpha * this.globalAlpha;
-
- var W = 10;
- var H = 10;
-
- lineStr.push('<g_vml_:shape',
- ' filled="', !!aFill, '"',
- ' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
- ' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
- ' stroked="', !aFill, '"',
- ' path="');
-
- var newSeq = false;
- var min = {x: null, y: null};
- var max = {x: null, y: null};
-
- for (var i = 0; i < this.currentPath_.length; i++) {
- var p = this.currentPath_[i];
- var c;
-
- switch (p.type) {
- case 'moveTo':
- c = p;
- lineStr.push(' m ', mr(p.x), ',', mr(p.y));
- break;
- case 'lineTo':
- lineStr.push(' l ', mr(p.x), ',', mr(p.y));
- break;
- case 'close':
- lineStr.push(' x ');
- p = null;
- break;
- case 'bezierCurveTo':
- lineStr.push(' c ',
- mr(p.cp1x), ',', mr(p.cp1y), ',',
- mr(p.cp2x), ',', mr(p.cp2y), ',',
- mr(p.x), ',', mr(p.y));
- break;
- case 'at':
- case 'wa':
- lineStr.push(' ', p.type, ' ',
- mr(p.x - this.arcScaleX_ * p.radius), ',',
- mr(p.y - this.arcScaleY_ * p.radius), ' ',
- mr(p.x + this.arcScaleX_ * p.radius), ',',
- mr(p.y + this.arcScaleY_ * p.radius), ' ',
- mr(p.xStart), ',', mr(p.yStart), ' ',
- mr(p.xEnd), ',', mr(p.yEnd));
- break;
- }
-
-
- // TODO: Following is broken for curves due to
- // move to proper paths.
-
- // Figure out dimensions so we can do gradient fills
- // properly
- if (p) {
- if (min.x == null || p.x < min.x) {
- min.x = p.x;
- }
- if (max.x == null || p.x > max.x) {
- max.x = p.x;
- }
- if (min.y == null || p.y < min.y) {
- min.y = p.y;
- }
- if (max.y == null || p.y > max.y) {
- max.y = p.y;
- }
- }
- }
- lineStr.push(' ">');
-
- if (!aFill) {
- var lineWidth = this.lineScale_ * this.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="', this.lineJoin, '"',
- ' miterlimit="', this.miterLimit, '"',
- ' endcap="', processLineCap(this.lineCap), '"',
- ' weight="', lineWidth, 'px"',
- ' color="', color, '" />'
- );
- } else if (typeof this.fillStyle == 'object') {
- var fillStyle = this.fillStyle;
- 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_ / this.arcScaleX_;
- var y0 = fillStyle.y0_ / this.arcScaleY_;
- var x1 = fillStyle.x1_ / this.arcScaleX_;
- var y1 = fillStyle.y1_ / this.arcScaleY_;
- var p0 = this.getCoords_(x0, y0);
- var p1 = this.getCoords_(x1, y1);
- var 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 = this.getCoords_(fillStyle.x0_, fillStyle.y0_);
- var width = max.x - min.x;
- var height = max.y - min.y;
- focus = {
- x: (p0.x - min.x) / width,
- y: (p0.y - min.y) / height
- };
-
- width /= this.arcScaleX_ * Z;
- height /= this.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 * this.globalAlpha;
- var opacity2 = stops[length - 1].alpha * this.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 {
- lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity,
- '" />');
- }
-
- lineStr.push('</g_vml_:shape>');
-
- this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
- };
-
- 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() {
- copyState(this.aStack_.pop(), this);
- this.m_ = this.mStack_.pop();
- };
-
- contextPrototype.translate = function(aX, aY) {
- var m1 = [
- [1, 0, 0],
- [0, 1, 0],
- [aX, aY, 1]
- ];
-
- this.m_ = matrixMultiply(m1, this.m_);
- };
-
- contextPrototype.rotate = function(aRot) {
- var c = mc(aRot);
- var s = ms(aRot);
-
- var m1 = [
- [c, s, 0],
- [-s, c, 0],
- [0, 0, 1]
- ];
-
- this.m_ = matrixMultiply(m1, this.m_);
- };
-
- contextPrototype.scale = function(aX, aY) {
- this.arcScaleX_ *= aX;
- this.arcScaleY_ *= aY;
- var m1 = [
- [aX, 0, 0],
- [0, aY, 0],
- [0, 0, 1]
- ];
-
- var m = this.m_ = matrixMultiply(m1, this.m_);
-
- // 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];
- this.lineScale_ = sqrt(abs(det));
- };
-
- /******** STUBS ********/
- contextPrototype.clip = function() {
- // TODO: Implement
- };
-
- contextPrototype.arcTo = function() {
- // TODO: Implement
- };
-
- contextPrototype.createPattern = function() {
- return new CanvasPattern_;
- };
-
- // 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_() {}
-
- // set up externs
- G_vmlCanvasManager = G_vmlCanvasManager_;
- CanvasRenderingContext2D = CanvasRenderingContext2D_;
- CanvasGradient = CanvasGradient_;
- CanvasPattern = CanvasPattern_;
-
-})();
-
-} // if
--- /dev/null
+// 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 are not implemented.
+// * Radial gradient are not implemented. The VML version of these look very
+// different from the canvas one.
+// * Clipping paths are not implemented.
+// * Coordsize. The width and height attribute have higher priority than the
+// width and height style values which isn't correct.
+// * Painting mode isn't implemented.
+// * Canvas width/height should is using content-box by default. IE in
+// Quirks mode will draw the canvas using border-box. Either change your
+// doctype to HTML5
+// (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
+// or use Box Sizing Behavior from WebFX
+// (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
+// * Non uniform scaling does not correctly scale strokes.
+// * Optimize. There is always room for speed improvements.
+
+// Only add this code if we do not already have a canvas implementation
+if (!document.createElement('canvas').getContext) {
+
+(function() {
+
+ // alias some functions to make (compiled) code shorter
+ var m = Math;
+ var mr = m.round;
+ var ms = m.sin;
+ var mc = m.cos;
+ var abs = m.abs;
+ var sqrt = m.sqrt;
+
+ // this is used for sub pixel precision
+ var Z = 10;
+ var Z2 = Z / 2;
+
+ /**
+ * This funtion is assigned to the <canvas> elements as element.getContext().
+ * @this {HTMLElement}
+ * @return {CanvasRenderingContext2D_}
+ */
+ function getContext() {
+ return this.context_ ||
+ (this.context_ = new CanvasRenderingContext2D_(this));
+ }
+
+ var slice = Array.prototype.slice;
+
+ /**
+ * Binds a function to an object. The returned function will always use the
+ * passed in {@code obj} as {@code this}.
+ *
+ * Example:
+ *
+ * g = bind(f, obj, a, b)
+ * g(c, d) // will do f.call(obj, a, b, c, d)
+ *
+ * @param {Function} f The function to bind the object to
+ * @param {Object} obj The object that should act as this when the function
+ * is called
+ * @param {*} var_args Rest arguments that will be used as the initial
+ * arguments when the function is called
+ * @return {Function} A new function that has bound this
+ */
+ function bind(f, obj, var_args) {
+ var a = slice.call(arguments, 2);
+ return function() {
+ return f.apply(obj, a.concat(slice.call(arguments)));
+ };
+ }
+
+ 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) {
+ // create xmlns
+ if (!doc.namespaces['g_vml_']) {
+ doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml',
+ '#default#VML');
+
+ }
+ if (!doc.namespaces['g_o_']) {
+ doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office',
+ '#default#VML');
+ }
+
+ // Setup default CSS. Only add one style sheet per document
+ if (!doc.styleSheets['ex_canvas_']) {
+ var ss = doc.createStyleSheet();
+ ss.owningElement.id = 'ex_canvas_';
+ ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
+ // default size is 300x150 in Gecko and Opera
+ 'text-align:left;width:300px;height:150px}' +
+ 'g_vml_\\:*{behavior:url(#default#VML)}' +
+ 'g_o_\\:*{behavior:url(#default#VML)}';
+
+ }
+
+ // find all canvas elements
+ var els = doc.getElementsByTagName('canvas');
+ for (var i = 0; i < els.length; i++) {
+ 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;
+
+ // 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.style.width = el.attributes.width.nodeValue + 'px';
+ el.getContext().clearRect();
+ break;
+ case 'height':
+ el.style.height = el.attributes.height.nodeValue + 'px';
+ el.getContext().clearRect();
+ 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 dec2hex = [];
+ for (var i = 0; i < 16; i++) {
+ for (var j = 0; j < 16; j++) {
+ dec2hex[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.arcScaleX_ = o1.arcScaleX_;
+ o2.arcScaleY_ = o1.arcScaleY_;
+ o2.lineScale_ = o1.lineScale_;
+ }
+
+ function processStyle(styleString) {
+ var str, alpha = 1;
+
+ styleString = String(styleString);
+ if (styleString.substring(0, 3) == 'rgb') {
+ var start = styleString.indexOf('(', 3);
+ var end = styleString.indexOf(')', start + 1);
+ var guts = styleString.substring(start + 1, end).split(',');
+
+ str = '#';
+ for (var i = 0; i < 3; i++) {
+ str += dec2hex[Number(guts[i])];
+ }
+
+ if (guts.length == 4 && styleString.substr(3, 1) == 'a') {
+ alpha = guts[3];
+ }
+ } else {
+ str = styleString;
+ }
+
+ return {color: str, alpha: alpha};
+ }
+
+ 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.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() {
+ this.element_.innerHTML = '';
+ this.currentPath_ = [];
+ };
+
+ 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) {
+ // Will destroy any existing path (same as FF behaviour)
+ 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_ = [];
+ };
+
+ contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
+ // Will destroy any existing path (same as FF behaviour)
+ 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_ = [];
+ };
+
+ 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]) {
+ var filter = [];
+
+ // Note the 12/21 reversal
+ filter.push('M11=', this.m_[0][0], ',',
+ 'M12=', this.m_[1][0], ',',
+ 'M21=', this.m_[0][1], ',',
+ 'M22=', this.m_[1][1], ',',
+ 'Dx=', mr(d.x / Z), ',',
+ 'Dy=', mr(d.y / Z), '');
+
+ // Bounding box calculation (need to minimize displayed area so that
+ // filters don't waste time on unused pixels.
+ var max = d;
+ var c2 = this.getCoords_(dx + dw, dy);
+ var c3 = this.getCoords_(dx, dy + dh);
+ var c4 = this.getCoords_(dx + dw, dy + dh);
+
+ max.x = m.max(max.x, c2.x, c3.x, c4.x);
+ max.y = m.max(max.y, c2.y, c3.y, c4.y);
+
+ vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z),
+ 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
+ filter.join(''), ", sizingmethod='clip');")
+ } else {
+ vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;');
+ }
+
+ vmlStr.push(' ">' ,
+ '<g_vml_:image src="', image.src, '"',
+ ' style="width:', Z * dw, 'px;',
+ ' height:', Z * dh, 'px;"',
+ ' cropleft="', sx / w, '"',
+ ' croptop="', sy / h, '"',
+ ' cropright="', (w - sx - sw) / w, '"',
+ ' cropbottom="', (h - sy - sh) / h, '"',
+ ' />',
+ '</g_vml_:group>');
+
+ this.element_.insertAdjacentHTML('BeforeEnd',
+ vmlStr.join(''));
+ };
+
+ contextPrototype.stroke = function(aFill) {
+ var lineStr = [];
+ var lineOpen = false;
+ var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
+ var color = a.color;
+ var opacity = a.alpha * this.globalAlpha;
+
+ var W = 10;
+ var H = 10;
+
+ lineStr.push('<g_vml_:shape',
+ ' filled="', !!aFill, '"',
+ ' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
+ ' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
+ ' stroked="', !aFill, '"',
+ ' path="');
+
+ var newSeq = false;
+ var min = {x: null, y: null};
+ var max = {x: null, y: null};
+
+ for (var i = 0; i < this.currentPath_.length; i++) {
+ var p = this.currentPath_[i];
+ var c;
+
+ switch (p.type) {
+ case 'moveTo':
+ c = p;
+ lineStr.push(' m ', mr(p.x), ',', mr(p.y));
+ break;
+ case 'lineTo':
+ lineStr.push(' l ', mr(p.x), ',', mr(p.y));
+ break;
+ case 'close':
+ lineStr.push(' x ');
+ p = null;
+ break;
+ case 'bezierCurveTo':
+ lineStr.push(' c ',
+ mr(p.cp1x), ',', mr(p.cp1y), ',',
+ mr(p.cp2x), ',', mr(p.cp2y), ',',
+ mr(p.x), ',', mr(p.y));
+ break;
+ case 'at':
+ case 'wa':
+ lineStr.push(' ', p.type, ' ',
+ mr(p.x - this.arcScaleX_ * p.radius), ',',
+ mr(p.y - this.arcScaleY_ * p.radius), ' ',
+ mr(p.x + this.arcScaleX_ * p.radius), ',',
+ mr(p.y + this.arcScaleY_ * p.radius), ' ',
+ mr(p.xStart), ',', mr(p.yStart), ' ',
+ mr(p.xEnd), ',', mr(p.yEnd));
+ break;
+ }
+
+
+ // TODO: Following is broken for curves due to
+ // move to proper paths.
+
+ // Figure out dimensions so we can do gradient fills
+ // properly
+ if (p) {
+ if (min.x == null || p.x < min.x) {
+ min.x = p.x;
+ }
+ if (max.x == null || p.x > max.x) {
+ max.x = p.x;
+ }
+ if (min.y == null || p.y < min.y) {
+ min.y = p.y;
+ }
+ if (max.y == null || p.y > max.y) {
+ max.y = p.y;
+ }
+ }
+ }
+ lineStr.push(' ">');
+
+ if (!aFill) {
+ var lineWidth = this.lineScale_ * this.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="', this.lineJoin, '"',
+ ' miterlimit="', this.miterLimit, '"',
+ ' endcap="', processLineCap(this.lineCap), '"',
+ ' weight="', lineWidth, 'px"',
+ ' color="', color, '" />'
+ );
+ } else if (typeof this.fillStyle == 'object') {
+ var fillStyle = this.fillStyle;
+ 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_ / this.arcScaleX_;
+ var y0 = fillStyle.y0_ / this.arcScaleY_;
+ var x1 = fillStyle.x1_ / this.arcScaleX_;
+ var y1 = fillStyle.y1_ / this.arcScaleY_;
+ var p0 = this.getCoords_(x0, y0);
+ var p1 = this.getCoords_(x1, y1);
+ var 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 = this.getCoords_(fillStyle.x0_, fillStyle.y0_);
+ var width = max.x - min.x;
+ var height = max.y - min.y;
+ focus = {
+ x: (p0.x - min.x) / width,
+ y: (p0.y - min.y) / height
+ };
+
+ width /= this.arcScaleX_ * Z;
+ height /= this.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 * this.globalAlpha;
+ var opacity2 = stops[length - 1].alpha * this.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 {
+ lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity,
+ '" />');
+ }
+
+ lineStr.push('</g_vml_:shape>');
+
+ this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
+ };
+
+ 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() {
+ copyState(this.aStack_.pop(), this);
+ this.m_ = this.mStack_.pop();
+ };
+
+ contextPrototype.translate = function(aX, aY) {
+ var m1 = [
+ [1, 0, 0],
+ [0, 1, 0],
+ [aX, aY, 1]
+ ];
+
+ this.m_ = matrixMultiply(m1, this.m_);
+ };
+
+ contextPrototype.rotate = function(aRot) {
+ var c = mc(aRot);
+ var s = ms(aRot);
+
+ var m1 = [
+ [c, s, 0],
+ [-s, c, 0],
+ [0, 0, 1]
+ ];
+
+ this.m_ = matrixMultiply(m1, this.m_);
+ };
+
+ contextPrototype.scale = function(aX, aY) {
+ this.arcScaleX_ *= aX;
+ this.arcScaleY_ *= aY;
+ var m1 = [
+ [aX, 0, 0],
+ [0, aY, 0],
+ [0, 0, 1]
+ ];
+
+ var m = this.m_ = matrixMultiply(m1, this.m_);
+
+ // 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];
+ this.lineScale_ = sqrt(abs(det));
+ };
+
+ /******** STUBS ********/
+ contextPrototype.clip = function() {
+ // TODO: Implement
+ };
+
+ contextPrototype.arcTo = function() {
+ // TODO: Implement
+ };
+
+ contextPrototype.createPattern = function() {
+ return new CanvasPattern_;
+ };
+
+ // 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_() {}
+
+ // set up externs
+ G_vmlCanvasManager = G_vmlCanvasManager_;
+ CanvasRenderingContext2D = CanvasRenderingContext2D_;
+ CanvasGradient = CanvasGradient_;
+ CanvasPattern = CanvasPattern_;
+
+})();
+
+} // if
projects / dygraphs.git / commitdiff