Installation de la version modifié de QBE dans src/
[auf_rh_dae.git] / src / qbe / django_qbe / static / django_qbe / js / excanvas.js
1 // Copyright 2006 Google Inc.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15
16 // Known Issues:
17 //
18 // * Patterns are not implemented.
19 // * Radial gradient are not implemented. The VML version of these look very
20 // different from the canvas one.
21 // * Clipping paths are not implemented.
22 // * Coordsize. The width and height attribute have higher priority than the
23 // width and height style values which isn't correct.
24 // * Painting mode isn't implemented.
25 // * Canvas width/height should is using content-box by default. IE in
26 // Quirks mode will draw the canvas using border-box. Either change your
27 // doctype to HTML5
28 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
29 // or use Box Sizing Behavior from WebFX
30 // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
31 // * Non uniform scaling does not correctly scale strokes.
32 // * Optimize. There is always room for speed improvements.
33
34 // Only add this code if we do not already have a canvas implementation
35 if (!document.createElement('canvas').getContext) {
36
37 (function() {
38
39 // alias some functions to make (compiled) code shorter
40 var m = Math;
41 var mr = m.round;
42 var ms = m.sin;
43 var mc = m.cos;
44 var abs = m.abs;
45 var sqrt = m.sqrt;
46
47 // this is used for sub pixel precision
48 var Z = 10;
49 var Z2 = Z / 2;
50
51 /**
52 * This funtion is assigned to the <canvas> elements as element.getContext().
53 * @this {HTMLElement}
54 * @return {CanvasRenderingContext2D_}
55 */
56 function getContext() {
57 return this.context_ ||
58 (this.context_ = new CanvasRenderingContext2D_(this));
59 }
60
61 var slice = Array.prototype.slice;
62
63 /**
64 * Binds a function to an object. The returned function will always use the
65 * passed in {@code obj} as {@code this}.
66 *
67 * Example:
68 *
69 * g = bind(f, obj, a, b)
70 * g(c, d) // will do f.call(obj, a, b, c, d)
71 *
72 * @param {Function} f The function to bind the object to
73 * @param {Object} obj The object that should act as this when the function
74 * is called
75 * @param {*} var_args Rest arguments that will be used as the initial
76 * arguments when the function is called
77 * @return {Function} A new function that has bound this
78 */
79 function bind(f, obj, var_args) {
80 var a = slice.call(arguments, 2);
81 return function() {
82 return f.apply(obj, a.concat(slice.call(arguments)));
83 };
84 }
85
86 var G_vmlCanvasManager_ = {
87 init: function(opt_doc) {
88 if (/MSIE/.test(navigator.userAgent) && !window.opera) {
89 var doc = opt_doc || document;
90 // Create a dummy element so that IE will allow canvas elements to be
91 // recognized.
92 doc.createElement('canvas');
93 doc.attachEvent('onreadystatechange', bind(this.init_, this, doc));
94 }
95 },
96
97 init_: function(doc) {
98 // create xmlns
99 if (!doc.namespaces['g_vml_']) {
100 doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml',
101 '#default#VML');
102
103 }
104 if (!doc.namespaces['g_o_']) {
105 doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office',
106 '#default#VML');
107 }
108
109 // Setup default CSS. Only add one style sheet per document
110 if (!doc.styleSheets['ex_canvas_']) {
111 var ss = doc.createStyleSheet();
112 ss.owningElement.id = 'ex_canvas_';
113 ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
114 // default size is 300x150 in Gecko and Opera
115 'text-align:left;width:300px;height:150px}' +
116 'g_vml_\\:*{behavior:url(#default#VML)}' +
117 'g_o_\\:*{behavior:url(#default#VML)}';
118
119 }
120
121 // find all canvas elements
122 var els = doc.getElementsByTagName('canvas');
123 for (var i = 0; i < els.length; i++) {
124 this.initElement(els[i]);
125 }
126 },
127
128 /**
129 * Public initializes a canvas element so that it can be used as canvas
130 * element from now on. This is called automatically before the page is
131 * loaded but if you are creating elements using createElement you need to
132 * make sure this is called on the element.
133 * @param {HTMLElement} el The canvas element to initialize.
134 * @return {HTMLElement} the element that was created.
135 */
136 initElement: function(el) {
137 if (!el.getContext) {
138
139 el.getContext = getContext;
140
141 // Remove fallback content. There is no way to hide text nodes so we
142 // just remove all childNodes. We could hide all elements and remove
143 // text nodes but who really cares about the fallback content.
144 el.innerHTML = '';
145
146 // do not use inline function because that will leak memory
147 el.attachEvent('onpropertychange', onPropertyChange);
148 el.attachEvent('onresize', onResize);
149
150 var attrs = el.attributes;
151 if (attrs.width && attrs.width.specified) {
152 // TODO: use runtimeStyle and coordsize
153 // el.getContext().setWidth_(attrs.width.nodeValue);
154 el.style.width = attrs.width.nodeValue + 'px';
155 } else {
156 el.width = el.clientWidth;
157 }
158 if (attrs.height && attrs.height.specified) {
159 // TODO: use runtimeStyle and coordsize
160 // el.getContext().setHeight_(attrs.height.nodeValue);
161 el.style.height = attrs.height.nodeValue + 'px';
162 } else {
163 el.height = el.clientHeight;
164 }
165 //el.getContext().setCoordsize_()
166 }
167 return el;
168 }
169 };
170
171 function onPropertyChange(e) {
172 var el = e.srcElement;
173
174 switch (e.propertyName) {
175 case 'width':
176 el.style.width = el.attributes.width.nodeValue + 'px';
177 el.getContext().clearRect();
178 break;
179 case 'height':
180 el.style.height = el.attributes.height.nodeValue + 'px';
181 el.getContext().clearRect();
182 break;
183 }
184 }
185
186 function onResize(e) {
187 var el = e.srcElement;
188 if (el.firstChild) {
189 el.firstChild.style.width = el.clientWidth + 'px';
190 el.firstChild.style.height = el.clientHeight + 'px';
191 }
192 }
193
194 G_vmlCanvasManager_.init();
195
196 // precompute "00" to "FF"
197 var dec2hex = [];
198 for (var i = 0; i < 16; i++) {
199 for (var j = 0; j < 16; j++) {
200 dec2hex[i * 16 + j] = i.toString(16) + j.toString(16);
201 }
202 }
203
204 function createMatrixIdentity() {
205 return [
206 [1, 0, 0],
207 [0, 1, 0],
208 [0, 0, 1]
209 ];
210 }
211
212 function matrixMultiply(m1, m2) {
213 var result = createMatrixIdentity();
214
215 for (var x = 0; x < 3; x++) {
216 for (var y = 0; y < 3; y++) {
217 var sum = 0;
218
219 for (var z = 0; z < 3; z++) {
220 sum += m1[x][z] * m2[z][y];
221 }
222
223 result[x][y] = sum;
224 }
225 }
226 return result;
227 }
228
229 function copyState(o1, o2) {
230 o2.fillStyle = o1.fillStyle;
231 o2.lineCap = o1.lineCap;
232 o2.lineJoin = o1.lineJoin;
233 o2.lineWidth = o1.lineWidth;
234 o2.miterLimit = o1.miterLimit;
235 o2.shadowBlur = o1.shadowBlur;
236 o2.shadowColor = o1.shadowColor;
237 o2.shadowOffsetX = o1.shadowOffsetX;
238 o2.shadowOffsetY = o1.shadowOffsetY;
239 o2.strokeStyle = o1.strokeStyle;
240 o2.globalAlpha = o1.globalAlpha;
241 o2.arcScaleX_ = o1.arcScaleX_;
242 o2.arcScaleY_ = o1.arcScaleY_;
243 o2.lineScale_ = o1.lineScale_;
244 }
245
246 function processStyle(styleString) {
247 var str, alpha = 1;
248
249 styleString = String(styleString);
250 if (styleString.substring(0, 3) == 'rgb') {
251 var start = styleString.indexOf('(', 3);
252 var end = styleString.indexOf(')', start + 1);
253 var guts = styleString.substring(start + 1, end).split(',');
254
255 str = '#';
256 for (var i = 0; i < 3; i++) {
257 str += dec2hex[Number(guts[i])];
258 }
259
260 if (guts.length == 4 && styleString.substr(3, 1) == 'a') {
261 alpha = guts[3];
262 }
263 } else {
264 str = styleString;
265 }
266
267 return {color: str, alpha: alpha};
268 }
269
270 function processLineCap(lineCap) {
271 switch (lineCap) {
272 case 'butt':
273 return 'flat';
274 case 'round':
275 return 'round';
276 case 'square':
277 default:
278 return 'square';
279 }
280 }
281
282 /**
283 * This class implements CanvasRenderingContext2D interface as described by
284 * the WHATWG.
285 * @param {HTMLElement} surfaceElement The element that the 2D context should
286 * be associated with
287 */
288 function CanvasRenderingContext2D_(surfaceElement) {
289 this.m_ = createMatrixIdentity();
290
291 this.mStack_ = [];
292 this.aStack_ = [];
293 this.currentPath_ = [];
294
295 // Canvas context properties
296 this.strokeStyle = '#000';
297 this.fillStyle = '#000';
298
299 this.lineWidth = 1;
300 this.lineJoin = 'miter';
301 this.lineCap = 'butt';
302 this.miterLimit = Z * 1;
303 this.globalAlpha = 1;
304 this.canvas = surfaceElement;
305
306 var el = surfaceElement.ownerDocument.createElement('div');
307 el.style.width = surfaceElement.clientWidth + 'px';
308 el.style.height = surfaceElement.clientHeight + 'px';
309 el.style.overflow = 'hidden';
310 el.style.position = 'absolute';
311 surfaceElement.appendChild(el);
312
313 this.element_ = el;
314 this.arcScaleX_ = 1;
315 this.arcScaleY_ = 1;
316 this.lineScale_ = 1;
317 }
318
319 var contextPrototype = CanvasRenderingContext2D_.prototype;
320 contextPrototype.clearRect = function() {
321 this.element_.innerHTML = '';
322 };
323
324 contextPrototype.beginPath = function() {
325 // TODO: Branch current matrix so that save/restore has no effect
326 // as per safari docs.
327 this.currentPath_ = [];
328 };
329
330 contextPrototype.moveTo = function(aX, aY) {
331 var p = this.getCoords_(aX, aY);
332 this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y});
333 this.currentX_ = p.x;
334 this.currentY_ = p.y;
335 };
336
337 contextPrototype.lineTo = function(aX, aY) {
338 var p = this.getCoords_(aX, aY);
339 this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y});
340
341 this.currentX_ = p.x;
342 this.currentY_ = p.y;
343 };
344
345 contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
346 aCP2x, aCP2y,
347 aX, aY) {
348 var p = this.getCoords_(aX, aY);
349 var cp1 = this.getCoords_(aCP1x, aCP1y);
350 var cp2 = this.getCoords_(aCP2x, aCP2y);
351 bezierCurveTo(this, cp1, cp2, p);
352 };
353
354 // Helper function that takes the already fixed cordinates.
355 function bezierCurveTo(self, cp1, cp2, p) {
356 self.currentPath_.push({
357 type: 'bezierCurveTo',
358 cp1x: cp1.x,
359 cp1y: cp1.y,
360 cp2x: cp2.x,
361 cp2y: cp2.y,
362 x: p.x,
363 y: p.y
364 });
365 self.currentX_ = p.x;
366 self.currentY_ = p.y;
367 }
368
369 contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
370 // the following is lifted almost directly from
371 // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
372
373 var cp = this.getCoords_(aCPx, aCPy);
374 var p = this.getCoords_(aX, aY);
375
376 var cp1 = {
377 x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_),
378 y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_)
379 };
380 var cp2 = {
381 x: cp1.x + (p.x - this.currentX_) / 3.0,
382 y: cp1.y + (p.y - this.currentY_) / 3.0
383 };
384
385 bezierCurveTo(this, cp1, cp2, p);
386 };
387
388 contextPrototype.arc = function(aX, aY, aRadius,
389 aStartAngle, aEndAngle, aClockwise) {
390 aRadius *= Z;
391 var arcType = aClockwise ? 'at' : 'wa';
392
393 var xStart = aX + mc(aStartAngle) * aRadius - Z2;
394 var yStart = aY + ms(aStartAngle) * aRadius - Z2;
395
396 var xEnd = aX + mc(aEndAngle) * aRadius - Z2;
397 var yEnd = aY + ms(aEndAngle) * aRadius - Z2;
398
399 // IE won't render arches drawn counter clockwise if xStart == xEnd.
400 if (xStart == xEnd && !aClockwise) {
401 xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
402 // that can be represented in binary
403 }
404
405 var p = this.getCoords_(aX, aY);
406 var pStart = this.getCoords_(xStart, yStart);
407 var pEnd = this.getCoords_(xEnd, yEnd);
408
409 this.currentPath_.push({type: arcType,
410 x: p.x,
411 y: p.y,
412 radius: aRadius,
413 xStart: pStart.x,
414 yStart: pStart.y,
415 xEnd: pEnd.x,
416 yEnd: pEnd.y});
417
418 };
419
420 contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
421 this.moveTo(aX, aY);
422 this.lineTo(aX + aWidth, aY);
423 this.lineTo(aX + aWidth, aY + aHeight);
424 this.lineTo(aX, aY + aHeight);
425 this.closePath();
426 };
427
428 contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
429 var oldPath = this.currentPath_;
430 this.beginPath();
431
432 this.moveTo(aX, aY);
433 this.lineTo(aX + aWidth, aY);
434 this.lineTo(aX + aWidth, aY + aHeight);
435 this.lineTo(aX, aY + aHeight);
436 this.closePath();
437 this.stroke();
438
439 this.currentPath_ = oldPath;
440 };
441
442 contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
443 var oldPath = this.currentPath_;
444 this.beginPath();
445
446 this.moveTo(aX, aY);
447 this.lineTo(aX + aWidth, aY);
448 this.lineTo(aX + aWidth, aY + aHeight);
449 this.lineTo(aX, aY + aHeight);
450 this.closePath();
451 this.fill();
452
453 this.currentPath_ = oldPath;
454 };
455
456 contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
457 var gradient = new CanvasGradient_('gradient');
458 gradient.x0_ = aX0;
459 gradient.y0_ = aY0;
460 gradient.x1_ = aX1;
461 gradient.y1_ = aY1;
462 return gradient;
463 };
464
465 contextPrototype.createRadialGradient = function(aX0, aY0, aR0,
466 aX1, aY1, aR1) {
467 var gradient = new CanvasGradient_('gradientradial');
468 gradient.x0_ = aX0;
469 gradient.y0_ = aY0;
470 gradient.r0_ = aR0;
471 gradient.x1_ = aX1;
472 gradient.y1_ = aY1;
473 gradient.r1_ = aR1;
474 return gradient;
475 };
476
477 contextPrototype.drawImage = function(image, var_args) {
478 var dx, dy, dw, dh, sx, sy, sw, sh;
479
480 // to find the original width we overide the width and height
481 var oldRuntimeWidth = image.runtimeStyle.width;
482 var oldRuntimeHeight = image.runtimeStyle.height;
483 image.runtimeStyle.width = 'auto';
484 image.runtimeStyle.height = 'auto';
485
486 // get the original size
487 var w = image.width;
488 var h = image.height;
489
490 // and remove overides
491 image.runtimeStyle.width = oldRuntimeWidth;
492 image.runtimeStyle.height = oldRuntimeHeight;
493
494 if (arguments.length == 3) {
495 dx = arguments[1];
496 dy = arguments[2];
497 sx = sy = 0;
498 sw = dw = w;
499 sh = dh = h;
500 } else if (arguments.length == 5) {
501 dx = arguments[1];
502 dy = arguments[2];
503 dw = arguments[3];
504 dh = arguments[4];
505 sx = sy = 0;
506 sw = w;
507 sh = h;
508 } else if (arguments.length == 9) {
509 sx = arguments[1];
510 sy = arguments[2];
511 sw = arguments[3];
512 sh = arguments[4];
513 dx = arguments[5];
514 dy = arguments[6];
515 dw = arguments[7];
516 dh = arguments[8];
517 } else {
518 throw Error('Invalid number of arguments');
519 }
520
521 var d = this.getCoords_(dx, dy);
522
523 var w2 = sw / 2;
524 var h2 = sh / 2;
525
526 var vmlStr = [];
527
528 var W = 10;
529 var H = 10;
530
531 // For some reason that I've now forgotten, using divs didn't work
532 vmlStr.push(' <g_vml_:group',
533 ' coordsize="', Z * W, ',', Z * H, '"',
534 ' coordorigin="0,0"' ,
535 ' style="width:', W, 'px;height:', H, 'px;position:absolute;');
536
537 // If filters are necessary (rotation exists), create them
538 // filters are bog-slow, so only create them if abbsolutely necessary
539 // The following check doesn't account for skews (which don't exist
540 // in the canvas spec (yet) anyway.
541
542 if (this.m_[0][0] != 1 || this.m_[0][1]) {
543 var filter = [];
544
545 // Note the 12/21 reversal
546 filter.push('M11=', this.m_[0][0], ',',
547 'M12=', this.m_[1][0], ',',
548 'M21=', this.m_[0][1], ',',
549 'M22=', this.m_[1][1], ',',
550 'Dx=', mr(d.x / Z), ',',
551 'Dy=', mr(d.y / Z), '');
552
553 // Bounding box calculation (need to minimize displayed area so that
554 // filters don't waste time on unused pixels.
555 var max = d;
556 var c2 = this.getCoords_(dx + dw, dy);
557 var c3 = this.getCoords_(dx, dy + dh);
558 var c4 = this.getCoords_(dx + dw, dy + dh);
559
560 max.x = m.max(max.x, c2.x, c3.x, c4.x);
561 max.y = m.max(max.y, c2.y, c3.y, c4.y);
562
563 vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z),
564 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
565 filter.join(''), ", sizingmethod='clip');")
566 } else {
567 vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;');
568 }
569
570 vmlStr.push(' ">' ,
571 '<g_vml_:image src="', image.src, '"',
572 ' style="width:', Z * dw, 'px;',
573 ' height:', Z * dh, 'px;"',
574 ' cropleft="', sx / w, '"',
575 ' croptop="', sy / h, '"',
576 ' cropright="', (w - sx - sw) / w, '"',
577 ' cropbottom="', (h - sy - sh) / h, '"',
578 ' />',
579 '</g_vml_:group>');
580
581 this.element_.insertAdjacentHTML('BeforeEnd',
582 vmlStr.join(''));
583 };
584
585 contextPrototype.stroke = function(aFill) {
586 var lineStr = [];
587 var lineOpen = false;
588 var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
589 var color = a.color;
590 var opacity = a.alpha * this.globalAlpha;
591
592 var W = 10;
593 var H = 10;
594
595 lineStr.push('<g_vml_:shape',
596 ' filled="', !!aFill, '"',
597 ' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
598 ' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
599 ' stroked="', !aFill, '"',
600 ' path="');
601
602 var newSeq = false;
603 var min = {x: null, y: null};
604 var max = {x: null, y: null};
605
606 for (var i = 0; i < this.currentPath_.length; i++) {
607 var p = this.currentPath_[i];
608 var c;
609
610 switch (p.type) {
611 case 'moveTo':
612 c = p;
613 lineStr.push(' m ', mr(p.x), ',', mr(p.y));
614 break;
615 case 'lineTo':
616 lineStr.push(' l ', mr(p.x), ',', mr(p.y));
617 break;
618 case 'close':
619 lineStr.push(' x ');
620 p = null;
621 break;
622 case 'bezierCurveTo':
623 lineStr.push(' c ',
624 mr(p.cp1x), ',', mr(p.cp1y), ',',
625 mr(p.cp2x), ',', mr(p.cp2y), ',',
626 mr(p.x), ',', mr(p.y));
627 break;
628 case 'at':
629 case 'wa':
630 lineStr.push(' ', p.type, ' ',
631 mr(p.x - this.arcScaleX_ * p.radius), ',',
632 mr(p.y - this.arcScaleY_ * p.radius), ' ',
633 mr(p.x + this.arcScaleX_ * p.radius), ',',
634 mr(p.y + this.arcScaleY_ * p.radius), ' ',
635 mr(p.xStart), ',', mr(p.yStart), ' ',
636 mr(p.xEnd), ',', mr(p.yEnd));
637 break;
638 }
639
640
641 // TODO: Following is broken for curves due to
642 // move to proper paths.
643
644 // Figure out dimensions so we can do gradient fills
645 // properly
646 if (p) {
647 if (min.x == null || p.x < min.x) {
648 min.x = p.x;
649 }
650 if (max.x == null || p.x > max.x) {
651 max.x = p.x;
652 }
653 if (min.y == null || p.y < min.y) {
654 min.y = p.y;
655 }
656 if (max.y == null || p.y > max.y) {
657 max.y = p.y;
658 }
659 }
660 }
661 lineStr.push(' ">');
662
663 if (!aFill) {
664 var lineWidth = this.lineScale_ * this.lineWidth;
665
666 // VML cannot correctly render a line if the width is less than 1px.
667 // In that case, we dilute the color to make the line look thinner.
668 if (lineWidth < 1) {
669 opacity *= lineWidth;
670 }
671
672 lineStr.push(
673 '<g_vml_:stroke',
674 ' opacity="', opacity, '"',
675 ' joinstyle="', this.lineJoin, '"',
676 ' miterlimit="', this.miterLimit, '"',
677 ' endcap="', processLineCap(this.lineCap), '"',
678 ' weight="', lineWidth, 'px"',
679 ' color="', color, '" />'
680 );
681 } else if (typeof this.fillStyle == 'object') {
682 var fillStyle = this.fillStyle;
683 var angle = 0;
684 var focus = {x: 0, y: 0};
685
686 // additional offset
687 var shift = 0;
688 // scale factor for offset
689 var expansion = 1;
690
691 if (fillStyle.type_ == 'gradient') {
692 var x0 = fillStyle.x0_ / this.arcScaleX_;
693 var y0 = fillStyle.y0_ / this.arcScaleY_;
694 var x1 = fillStyle.x1_ / this.arcScaleX_;
695 var y1 = fillStyle.y1_ / this.arcScaleY_;
696 var p0 = this.getCoords_(x0, y0);
697 var p1 = this.getCoords_(x1, y1);
698 var dx = p1.x - p0.x;
699 var dy = p1.y - p0.y;
700 angle = Math.atan2(dx, dy) * 180 / Math.PI;
701
702 // The angle should be a non-negative number.
703 if (angle < 0) {
704 angle += 360;
705 }
706
707 // Very small angles produce an unexpected result because they are
708 // converted to a scientific notation string.
709 if (angle < 1e-6) {
710 angle = 0;
711 }
712 } else {
713 var p0 = this.getCoords_(fillStyle.x0_, fillStyle.y0_);
714 var width = max.x - min.x;
715 var height = max.y - min.y;
716 focus = {
717 x: (p0.x - min.x) / width,
718 y: (p0.y - min.y) / height
719 };
720
721 width /= this.arcScaleX_ * Z;
722 height /= this.arcScaleY_ * Z;
723 var dimension = m.max(width, height);
724 shift = 2 * fillStyle.r0_ / dimension;
725 expansion = 2 * fillStyle.r1_ / dimension - shift;
726 }
727
728 // We need to sort the color stops in ascending order by offset,
729 // otherwise IE won't interpret it correctly.
730 var stops = fillStyle.colors_;
731 stops.sort(function(cs1, cs2) {
732 return cs1.offset - cs2.offset;
733 });
734
735 var length = stops.length;
736 var color1 = stops[0].color;
737 var color2 = stops[length - 1].color;
738 var opacity1 = stops[0].alpha * this.globalAlpha;
739 var opacity2 = stops[length - 1].alpha * this.globalAlpha;
740
741 var colors = [];
742 for (var i = 0; i < length; i++) {
743 var stop = stops[i];
744 colors.push(stop.offset * expansion + shift + ' ' + stop.color);
745 }
746
747 // When colors attribute is used, the meanings of opacity and o:opacity2
748 // are reversed.
749 lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"',
750 ' method="none" focus="100%"',
751 ' color="', color1, '"',
752 ' color2="', color2, '"',
753 ' colors="', colors.join(','), '"',
754 ' opacity="', opacity2, '"',
755 ' g_o_:opacity2="', opacity1, '"',
756 ' angle="', angle, '"',
757 ' focusposition="', focus.x, ',', focus.y, '" />');
758 } else {
759 lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity,
760 '" />');
761 }
762
763 lineStr.push('</g_vml_:shape>');
764
765 this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
766 };
767
768 contextPrototype.fill = function() {
769 this.stroke(true);
770 }
771
772 contextPrototype.closePath = function() {
773 this.currentPath_.push({type: 'close'});
774 };
775
776 /**
777 * @private
778 */
779 contextPrototype.getCoords_ = function(aX, aY) {
780 var m = this.m_;
781 return {
782 x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2,
783 y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2
784 }
785 };
786
787 contextPrototype.save = function() {
788 var o = {};
789 copyState(this, o);
790 this.aStack_.push(o);
791 this.mStack_.push(this.m_);
792 this.m_ = matrixMultiply(createMatrixIdentity(), this.m_);
793 };
794
795 contextPrototype.restore = function() {
796 copyState(this.aStack_.pop(), this);
797 this.m_ = this.mStack_.pop();
798 };
799
800 function matrixIsFinite(m) {
801 for (var j = 0; j < 3; j++) {
802 for (var k = 0; k < 2; k++) {
803 if (!isFinite(m[j][k]) || isNaN(m[j][k])) {
804 return false;
805 }
806 }
807 }
808 return true;
809 }
810
811 function setM(ctx, m, updateLineScale) {
812 if (!matrixIsFinite(m)) {
813 return;
814 }
815 ctx.m_ = m;
816
817 if (updateLineScale) {
818 // Get the line scale.
819 // Determinant of this.m_ means how much the area is enlarged by the
820 // transformation. So its square root can be used as a scale factor
821 // for width.
822 var det = m[0][0] * m[1][1] - m[0][1] * m[1][0];
823 ctx.lineScale_ = sqrt(abs(det));
824 }
825 }
826
827 contextPrototype.translate = function(aX, aY) {
828 var m1 = [
829 [1, 0, 0],
830 [0, 1, 0],
831 [aX, aY, 1]
832 ];
833
834 setM(this, matrixMultiply(m1, this.m_), false);
835 };
836
837 contextPrototype.rotate = function(aRot) {
838 var c = mc(aRot);
839 var s = ms(aRot);
840
841 var m1 = [
842 [c, s, 0],
843 [-s, c, 0],
844 [0, 0, 1]
845 ];
846
847 setM(this, matrixMultiply(m1, this.m_), false);
848 };
849
850 contextPrototype.scale = function(aX, aY) {
851 this.arcScaleX_ *= aX;
852 this.arcScaleY_ *= aY;
853 var m1 = [
854 [aX, 0, 0],
855 [0, aY, 0],
856 [0, 0, 1]
857 ];
858
859 setM(this, matrixMultiply(m1, this.m_), true);
860 };
861
862 contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) {
863 var m1 = [
864 [m11, m12, 0],
865 [m21, m22, 0],
866 [dx, dy, 1]
867 ];
868
869 setM(this, matrixMultiply(m1, this.m_), true);
870 };
871
872 contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) {
873 var m = [
874 [m11, m12, 0],
875 [m21, m22, 0],
876 [dx, dy, 1]
877 ];
878
879 setM(this, m, true);
880 };
881
882 /******** STUBS ********/
883 contextPrototype.clip = function() {
884 // TODO: Implement
885 };
886
887 contextPrototype.arcTo = function() {
888 // TODO: Implement
889 };
890
891 contextPrototype.createPattern = function() {
892 return new CanvasPattern_;
893 };
894
895 // Gradient / Pattern Stubs
896 function CanvasGradient_(aType) {
897 this.type_ = aType;
898 this.x0_ = 0;
899 this.y0_ = 0;
900 this.r0_ = 0;
901 this.x1_ = 0;
902 this.y1_ = 0;
903 this.r1_ = 0;
904 this.colors_ = [];
905 }
906
907 CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) {
908 aColor = processStyle(aColor);
909 this.colors_.push({offset: aOffset,
910 color: aColor.color,
911 alpha: aColor.alpha});
912 };
913
914 function CanvasPattern_() {}
915
916 // set up externs
917 G_vmlCanvasManager = G_vmlCanvasManager_;
918 CanvasRenderingContext2D = CanvasRenderingContext2D_;
919 CanvasGradient = CanvasGradient_;
920 CanvasPattern = CanvasPattern_;
921
922 })();
923
924 } // if