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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 only support repeat. | |
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 | // * Filling very large shapes (above 5000 points) is buggy. | |
33 | // * Optimize. There is always room for speed improvements. | |
34 | ||
35 | // Only add this code if we do not already have a canvas implementation | |
36 | if (!document.createElement('canvas').getContext) { | |
37 | ||
38 | (function() { | |
39 | ||
40 | // alias some functions to make (compiled) code shorter | |
41 | var m = Math; | |
42 | var mr = m.round; | |
43 | var ms = m.sin; | |
44 | var mc = m.cos; | |
45 | var abs = m.abs; | |
46 | var sqrt = m.sqrt; | |
47 | ||
48 | // this is used for sub pixel precision | |
49 | var Z = 10; | |
50 | var Z2 = Z / 2; | |
51 | ||
52 | var IE_VERSION = +navigator.userAgent.match(/MSIE ([\d.]+)?/)[1]; | |
53 | ||
54 | /** | |
55 | * This funtion is assigned to the <canvas> elements as element.getContext(). | |
56 | * @this {HTMLElement} | |
57 | * @return {CanvasRenderingContext2D_} | |
58 | */ | |
59 | function getContext() { | |
60 | return this.context_ || | |
61 | (this.context_ = new CanvasRenderingContext2D_(this)); | |
62 | } | |
63 | ||
64 | var slice = Array.prototype.slice; | |
65 | ||
66 | /** | |
67 | * Binds a function to an object. The returned function will always use the | |
68 | * passed in {@code obj} as {@code this}. | |
69 | * | |
70 | * Example: | |
71 | * | |
72 | * g = bind(f, obj, a, b) | |
73 | * g(c, d) // will do f.call(obj, a, b, c, d) | |
74 | * | |
75 | * @param {Function} f The function to bind the object to | |
76 | * @param {Object} obj The object that should act as this when the function | |
77 | * is called | |
78 | * @param {*} var_args Rest arguments that will be used as the initial | |
79 | * arguments when the function is called | |
80 | * @return {Function} A new function that has bound this | |
81 | */ | |
82 | function bind(f, obj, var_args) { | |
83 | var a = slice.call(arguments, 2); | |
84 | return function() { | |
85 | return f.apply(obj, a.concat(slice.call(arguments))); | |
86 | }; | |
87 | } | |
88 | ||
89 | function encodeHtmlAttribute(s) { | |
90 | return String(s).replace(/&/g, '&').replace(/"/g, '"'); | |
91 | } | |
92 | ||
93 | function addNamespace(doc, prefix, urn) { | |
94 | if (!doc.namespaces[prefix]) { | |
95 | doc.namespaces.add(prefix, urn, '#default#VML'); | |
96 | } | |
97 | } | |
98 | ||
99 | function addNamespacesAndStylesheet(doc) { | |
100 | addNamespace(doc, 'g_vml_', 'urn:schemas-microsoft-com:vml'); | |
101 | addNamespace(doc, 'g_o_', 'urn:schemas-microsoft-com:office:office'); | |
102 | ||
103 | // Setup default CSS. Only add one style sheet per document | |
104 | if (!doc.styleSheets['ex_canvas_']) { | |
105 | var ss = doc.createStyleSheet(); | |
106 | ss.owningElement.id = 'ex_canvas_'; | |
107 | ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + | |
108 | // default size is 300x150 in Gecko and Opera | |
109 | 'text-align:left;width:300px;height:150px}'; | |
110 | } | |
111 | } | |
112 | ||
113 | // Add namespaces and stylesheet at startup. | |
114 | addNamespacesAndStylesheet(document); | |
115 | ||
116 | var G_vmlCanvasManager_ = { | |
117 | init: function(opt_doc) { | |
118 | var doc = opt_doc || document; | |
119 | // Create a dummy element so that IE will allow canvas elements to be | |
120 | // recognized. | |
121 | doc.createElement('canvas'); | |
122 | doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); | |
123 | }, | |
124 | ||
125 | init_: function(doc) { | |
126 | // find all canvas elements | |
127 | var els = doc.getElementsByTagName('canvas'); | |
128 | for (var i = 0; i < els.length; i++) { | |
129 | this.initElement(els[i]); | |
130 | } | |
131 | }, | |
132 | ||
133 | /** | |
134 | * Public initializes a canvas element so that it can be used as canvas | |
135 | * element from now on. This is called automatically before the page is | |
136 | * loaded but if you are creating elements using createElement you need to | |
137 | * make sure this is called on the element. | |
138 | * @param {HTMLElement} el The canvas element to initialize. | |
139 | * @return {HTMLElement} the element that was created. | |
140 | */ | |
141 | initElement: function(el) { | |
142 | if (!el.getContext) { | |
143 | el.getContext = getContext; | |
144 | ||
145 | // Add namespaces and stylesheet to document of the element. | |
146 | addNamespacesAndStylesheet(el.ownerDocument); | |
147 | ||
148 | // Remove fallback content. There is no way to hide text nodes so we | |
149 | // just remove all childNodes. We could hide all elements and remove | |
150 | // text nodes but who really cares about the fallback content. | |
151 | el.innerHTML = ''; | |
152 | ||
153 | // do not use inline function because that will leak memory | |
154 | el.attachEvent('onpropertychange', onPropertyChange); | |
155 | el.attachEvent('onresize', onResize); | |
156 | ||
157 | var attrs = el.attributes; | |
158 | if (attrs.width && attrs.width.specified) { | |
159 | // TODO: use runtimeStyle and coordsize | |
160 | // el.getContext().setWidth_(attrs.width.nodeValue); | |
161 | el.style.width = attrs.width.nodeValue + 'px'; | |
162 | } else { | |
163 | el.width = el.clientWidth; | |
164 | } | |
165 | if (attrs.height && attrs.height.specified) { | |
166 | // TODO: use runtimeStyle and coordsize | |
167 | // el.getContext().setHeight_(attrs.height.nodeValue); | |
168 | el.style.height = attrs.height.nodeValue + 'px'; | |
169 | } else { | |
170 | el.height = el.clientHeight; | |
171 | } | |
172 | //el.getContext().setCoordsize_() | |
173 | } | |
174 | return el; | |
175 | } | |
176 | }; | |
177 | ||
178 | function onPropertyChange(e) { | |
179 | var el = e.srcElement; | |
180 | ||
181 | switch (e.propertyName) { | |
182 | case 'width': | |
183 | el.getContext().clearRect(); | |
184 | el.style.width = el.attributes.width.nodeValue + 'px'; | |
185 | // In IE8 this does not trigger onresize. | |
186 | el.firstChild.style.width = el.clientWidth + 'px'; | |
187 | break; | |
188 | case 'height': | |
189 | el.getContext().clearRect(); | |
190 | el.style.height = el.attributes.height.nodeValue + 'px'; | |
191 | el.firstChild.style.height = el.clientHeight + 'px'; | |
192 | break; | |
193 | } | |
194 | } | |
195 | ||
196 | function onResize(e) { | |
197 | var el = e.srcElement; | |
198 | if (el.firstChild) { | |
199 | el.firstChild.style.width = el.clientWidth + 'px'; | |
200 | el.firstChild.style.height = el.clientHeight + 'px'; | |
201 | } | |
202 | } | |
203 | ||
204 | G_vmlCanvasManager_.init(); | |
205 | ||
206 | // precompute "00" to "FF" | |
207 | var decToHex = []; | |
208 | for (var i = 0; i < 16; i++) { | |
209 | for (var j = 0; j < 16; j++) { | |
210 | decToHex[i * 16 + j] = i.toString(16) + j.toString(16); | |
211 | } | |
212 | } | |
213 | ||
214 | function createMatrixIdentity() { | |
215 | return [ | |
216 | [1, 0, 0], | |
217 | [0, 1, 0], | |
218 | [0, 0, 1] | |
219 | ]; | |
220 | } | |
221 | ||
222 | function matrixMultiply(m1, m2) { | |
223 | var result = createMatrixIdentity(); | |
224 | ||
225 | for (var x = 0; x < 3; x++) { | |
226 | for (var y = 0; y < 3; y++) { | |
227 | var sum = 0; | |
228 | ||
229 | for (var z = 0; z < 3; z++) { | |
230 | sum += m1[x][z] * m2[z][y]; | |
231 | } | |
232 | ||
233 | result[x][y] = sum; | |
234 | } | |
235 | } | |
236 | return result; | |
237 | } | |
238 | ||
239 | function copyState(o1, o2) { | |
240 | o2.fillStyle = o1.fillStyle; | |
241 | o2.lineCap = o1.lineCap; | |
242 | o2.lineJoin = o1.lineJoin; | |
243 | o2.lineWidth = o1.lineWidth; | |
244 | o2.miterLimit = o1.miterLimit; | |
245 | o2.shadowBlur = o1.shadowBlur; | |
246 | o2.shadowColor = o1.shadowColor; | |
247 | o2.shadowOffsetX = o1.shadowOffsetX; | |
248 | o2.shadowOffsetY = o1.shadowOffsetY; | |
249 | o2.strokeStyle = o1.strokeStyle; | |
250 | o2.globalAlpha = o1.globalAlpha; | |
251 | o2.font = o1.font; | |
252 | o2.textAlign = o1.textAlign; | |
253 | o2.textBaseline = o1.textBaseline; | |
254 | o2.arcScaleX_ = o1.arcScaleX_; | |
255 | o2.arcScaleY_ = o1.arcScaleY_; | |
256 | o2.lineScale_ = o1.lineScale_; | |
257 | } | |
258 | ||
259 | var colorData = { | |
260 | aliceblue: '#F0F8FF', | |
261 | antiquewhite: '#FAEBD7', | |
262 | aquamarine: '#7FFFD4', | |
263 | azure: '#F0FFFF', | |
264 | beige: '#F5F5DC', | |
265 | bisque: '#FFE4C4', | |
266 | black: '#000000', | |
267 | blanchedalmond: '#FFEBCD', | |
268 | blueviolet: '#8A2BE2', | |
269 | brown: '#A52A2A', | |
270 | burlywood: '#DEB887', | |
271 | cadetblue: '#5F9EA0', | |
272 | chartreuse: '#7FFF00', | |
273 | chocolate: '#D2691E', | |
274 | coral: '#FF7F50', | |
275 | cornflowerblue: '#6495ED', | |
276 | cornsilk: '#FFF8DC', | |
277 | crimson: '#DC143C', | |
278 | cyan: '#00FFFF', | |
279 | darkblue: '#00008B', | |
280 | darkcyan: '#008B8B', | |
281 | darkgoldenrod: '#B8860B', | |
282 | darkgray: '#A9A9A9', | |
283 | darkgreen: '#006400', | |
284 | darkgrey: '#A9A9A9', | |
285 | darkkhaki: '#BDB76B', | |
286 | darkmagenta: '#8B008B', | |
287 | darkolivegreen: '#556B2F', | |
288 | darkorange: '#FF8C00', | |
289 | darkorchid: '#9932CC', | |
290 | darkred: '#8B0000', | |
291 | darksalmon: '#E9967A', | |
292 | darkseagreen: '#8FBC8F', | |
293 | darkslateblue: '#483D8B', | |
294 | darkslategray: '#2F4F4F', | |
295 | darkslategrey: '#2F4F4F', | |
296 | darkturquoise: '#00CED1', | |
297 | darkviolet: '#9400D3', | |
298 | deeppink: '#FF1493', | |
299 | deepskyblue: '#00BFFF', | |
300 | dimgray: '#696969', | |
301 | dimgrey: '#696969', | |
302 | dodgerblue: '#1E90FF', | |
303 | firebrick: '#B22222', | |
304 | floralwhite: '#FFFAF0', | |
305 | forestgreen: '#228B22', | |
306 | gainsboro: '#DCDCDC', | |
307 | ghostwhite: '#F8F8FF', | |
308 | gold: '#FFD700', | |
309 | goldenrod: '#DAA520', | |
310 | grey: '#808080', | |
311 | greenyellow: '#ADFF2F', | |
312 | honeydew: '#F0FFF0', | |
313 | hotpink: '#FF69B4', | |
314 | indianred: '#CD5C5C', | |
315 | indigo: '#4B0082', | |
316 | ivory: '#FFFFF0', | |
317 | khaki: '#F0E68C', | |
318 | lavender: '#E6E6FA', | |
319 | lavenderblush: '#FFF0F5', | |
320 | lawngreen: '#7CFC00', | |
321 | lemonchiffon: '#FFFACD', | |
322 | lightblue: '#ADD8E6', | |
323 | lightcoral: '#F08080', | |
324 | lightcyan: '#E0FFFF', | |
325 | lightgoldenrodyellow: '#FAFAD2', | |
326 | lightgreen: '#90EE90', | |
327 | lightgrey: '#D3D3D3', | |
328 | lightpink: '#FFB6C1', | |
329 | lightsalmon: '#FFA07A', | |
330 | lightseagreen: '#20B2AA', | |
331 | lightskyblue: '#87CEFA', | |
332 | lightslategray: '#778899', | |
333 | lightslategrey: '#778899', | |
334 | lightsteelblue: '#B0C4DE', | |
335 | lightyellow: '#FFFFE0', | |
336 | limegreen: '#32CD32', | |
337 | linen: '#FAF0E6', | |
338 | magenta: '#FF00FF', | |
339 | mediumaquamarine: '#66CDAA', | |
340 | mediumblue: '#0000CD', | |
341 | mediumorchid: '#BA55D3', | |
342 | mediumpurple: '#9370DB', | |
343 | mediumseagreen: '#3CB371', | |
344 | mediumslateblue: '#7B68EE', | |
345 | mediumspringgreen: '#00FA9A', | |
346 | mediumturquoise: '#48D1CC', | |
347 | mediumvioletred: '#C71585', | |
348 | midnightblue: '#191970', | |
349 | mintcream: '#F5FFFA', | |
350 | mistyrose: '#FFE4E1', | |
351 | moccasin: '#FFE4B5', | |
352 | navajowhite: '#FFDEAD', | |
353 | oldlace: '#FDF5E6', | |
354 | olivedrab: '#6B8E23', | |
355 | orange: '#FFA500', | |
356 | orangered: '#FF4500', | |
357 | orchid: '#DA70D6', | |
358 | palegoldenrod: '#EEE8AA', | |
359 | palegreen: '#98FB98', | |
360 | paleturquoise: '#AFEEEE', | |
361 | palevioletred: '#DB7093', | |
362 | papayawhip: '#FFEFD5', | |
363 | peachpuff: '#FFDAB9', | |
364 | peru: '#CD853F', | |
365 | pink: '#FFC0CB', | |
366 | plum: '#DDA0DD', | |
367 | powderblue: '#B0E0E6', | |
368 | rosybrown: '#BC8F8F', | |
369 | royalblue: '#4169E1', | |
370 | saddlebrown: '#8B4513', | |
371 | salmon: '#FA8072', | |
372 | sandybrown: '#F4A460', | |
373 | seagreen: '#2E8B57', | |
374 | seashell: '#FFF5EE', | |
375 | sienna: '#A0522D', | |
376 | skyblue: '#87CEEB', | |
377 | slateblue: '#6A5ACD', | |
378 | slategray: '#708090', | |
379 | slategrey: '#708090', | |
380 | snow: '#FFFAFA', | |
381 | springgreen: '#00FF7F', | |
382 | steelblue: '#4682B4', | |
383 | tan: '#D2B48C', | |
384 | thistle: '#D8BFD8', | |
385 | tomato: '#FF6347', | |
386 | turquoise: '#40E0D0', | |
387 | violet: '#EE82EE', | |
388 | wheat: '#F5DEB3', | |
389 | whitesmoke: '#F5F5F5', | |
390 | yellowgreen: '#9ACD32' | |
391 | }; | |
392 | ||
393 | ||
394 | function getRgbHslContent(styleString) { | |
395 | var start = styleString.indexOf('(', 3); | |
396 | var end = styleString.indexOf(')', start + 1); | |
397 | var parts = styleString.substring(start + 1, end).split(','); | |
398 | // add alpha if needed | |
399 | if (parts.length != 4 || styleString.charAt(3) != 'a') { | |
400 | parts[3] = 1; | |
401 | } | |
402 | return parts; | |
403 | } | |
404 | ||
405 | function percent(s) { | |
406 | return parseFloat(s) / 100; | |
407 | } | |
408 | ||
409 | function clamp(v, min, max) { | |
410 | return Math.min(max, Math.max(min, v)); | |
411 | } | |
412 | ||
413 | function hslToRgb(parts){ | |
414 | var r, g, b, h, s, l; | |
415 | h = parseFloat(parts[0]) / 360 % 360; | |
416 | if (h < 0) | |
417 | h++; | |
418 | s = clamp(percent(parts[1]), 0, 1); | |
419 | l = clamp(percent(parts[2]), 0, 1); | |
420 | if (s == 0) { | |
421 | r = g = b = l; // achromatic | |
422 | } else { | |
423 | var q = l < 0.5 ? l * (1 + s) : l + s - l * s; | |
424 | var p = 2 * l - q; | |
425 | r = hueToRgb(p, q, h + 1 / 3); | |
426 | g = hueToRgb(p, q, h); | |
427 | b = hueToRgb(p, q, h - 1 / 3); | |
428 | } | |
429 | ||
430 | return '#' + decToHex[Math.floor(r * 255)] + | |
431 | decToHex[Math.floor(g * 255)] + | |
432 | decToHex[Math.floor(b * 255)]; | |
433 | } | |
434 | ||
435 | function hueToRgb(m1, m2, h) { | |
436 | if (h < 0) | |
437 | h++; | |
438 | if (h > 1) | |
439 | h--; | |
440 | ||
441 | if (6 * h < 1) | |
442 | return m1 + (m2 - m1) * 6 * h; | |
443 | else if (2 * h < 1) | |
444 | return m2; | |
445 | else if (3 * h < 2) | |
446 | return m1 + (m2 - m1) * (2 / 3 - h) * 6; | |
447 | else | |
448 | return m1; | |
449 | } | |
450 | ||
451 | var processStyleCache = {}; | |
452 | ||
453 | function processStyle(styleString) { | |
454 | if (styleString in processStyleCache) { | |
455 | return processStyleCache[styleString]; | |
456 | } | |
457 | ||
458 | var str, alpha = 1; | |
459 | ||
460 | styleString = String(styleString); | |
461 | if (styleString.charAt(0) == '#') { | |
462 | str = styleString; | |
463 | } else if (/^rgb/.test(styleString)) { | |
464 | var parts = getRgbHslContent(styleString); | |
465 | var str = '#', n; | |
466 | for (var i = 0; i < 3; i++) { | |
467 | if (parts[i].indexOf('%') != -1) { | |
468 | n = Math.floor(percent(parts[i]) * 255); | |
469 | } else { | |
470 | n = +parts[i]; | |
471 | } | |
472 | str += decToHex[clamp(n, 0, 255)]; | |
473 | } | |
474 | alpha = +parts[3]; | |
475 | } else if (/^hsl/.test(styleString)) { | |
476 | var parts = getRgbHslContent(styleString); | |
477 | str = hslToRgb(parts); | |
478 | alpha = parts[3]; | |
479 | } else { | |
480 | str = colorData[styleString] || styleString; | |
481 | } | |
482 | return processStyleCache[styleString] = {color: str, alpha: alpha}; | |
483 | } | |
484 | ||
485 | var DEFAULT_STYLE = { | |
486 | style: 'normal', | |
487 | variant: 'normal', | |
488 | weight: 'normal', | |
489 | size: 10, | |
490 | family: 'sans-serif' | |
491 | }; | |
492 | ||
493 | // Internal text style cache | |
494 | var fontStyleCache = {}; | |
495 | ||
496 | function processFontStyle(styleString) { | |
497 | if (fontStyleCache[styleString]) { | |
498 | return fontStyleCache[styleString]; | |
499 | } | |
500 | ||
501 | var el = document.createElement('div'); | |
502 | var style = el.style; | |
503 | try { | |
504 | style.font = styleString; | |
505 | } catch (ex) { | |
506 | // Ignore failures to set to invalid font. | |
507 | } | |
508 | ||
509 | return fontStyleCache[styleString] = { | |
510 | style: style.fontStyle || DEFAULT_STYLE.style, | |
511 | variant: style.fontVariant || DEFAULT_STYLE.variant, | |
512 | weight: style.fontWeight || DEFAULT_STYLE.weight, | |
513 | size: style.fontSize || DEFAULT_STYLE.size, | |
514 | family: style.fontFamily || DEFAULT_STYLE.family | |
515 | }; | |
516 | } | |
517 | ||
518 | function getComputedStyle(style, element) { | |
519 | var computedStyle = {}; | |
520 | ||
521 | for (var p in style) { | |
522 | computedStyle[p] = style[p]; | |
523 | } | |
524 | ||
525 | // Compute the size | |
526 | var canvasFontSize = parseFloat(element.currentStyle.fontSize), | |
527 | fontSize = parseFloat(style.size); | |
528 | ||
529 | if (typeof style.size == 'number') { | |
530 | computedStyle.size = style.size; | |
531 | } else if (style.size.indexOf('px') != -1) { | |
532 | computedStyle.size = fontSize; | |
533 | } else if (style.size.indexOf('em') != -1) { | |
534 | computedStyle.size = canvasFontSize * fontSize; | |
535 | } else if(style.size.indexOf('%') != -1) { | |
536 | computedStyle.size = (canvasFontSize / 100) * fontSize; | |
537 | } else if (style.size.indexOf('pt') != -1) { | |
538 | computedStyle.size = fontSize / .75; | |
539 | } else { | |
540 | computedStyle.size = canvasFontSize; | |
541 | } | |
542 | ||
543 | // Different scaling between normal text and VML text. This was found using | |
544 | // trial and error to get the same size as non VML text. | |
545 | computedStyle.size *= 0.981; | |
546 | ||
547 | return computedStyle; | |
548 | } | |
549 | ||
550 | function buildStyle(style) { | |
551 | return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + | |
552 | style.size + 'px ' + style.family; | |
553 | } | |
554 | ||
555 | var lineCapMap = { | |
556 | 'butt': 'flat', | |
557 | 'round': 'round' | |
558 | }; | |
559 | ||
560 | function processLineCap(lineCap) { | |
561 | return lineCapMap[lineCap] || 'square'; | |
562 | } | |
563 | ||
564 | /** | |
565 | * This class implements CanvasRenderingContext2D interface as described by | |
566 | * the WHATWG. | |
567 | * @param {HTMLElement} canvasElement The element that the 2D context should | |
568 | * be associated with | |
569 | */ | |
570 | function CanvasRenderingContext2D_(canvasElement) { | |
571 | this.m_ = createMatrixIdentity(); | |
572 | ||
573 | this.mStack_ = []; | |
574 | this.aStack_ = []; | |
575 | this.currentPath_ = []; | |
576 | ||
577 | // Canvas context properties | |
578 | this.strokeStyle = '#000'; | |
579 | this.fillStyle = '#000'; | |
580 | ||
581 | this.lineWidth = 1; | |
582 | this.lineJoin = 'miter'; | |
583 | this.lineCap = 'butt'; | |
584 | this.miterLimit = Z * 1; | |
585 | this.globalAlpha = 1; | |
586 | this.font = '10px sans-serif'; | |
587 | this.textAlign = 'left'; | |
588 | this.textBaseline = 'alphabetic'; | |
589 | this.canvas = canvasElement; | |
590 | ||
591 | var cssText = 'width:' + canvasElement.clientWidth + 'px;height:' + | |
592 | canvasElement.clientHeight + 'px;overflow:hidden;position:absolute'; | |
593 | var el = canvasElement.ownerDocument.createElement('div'); | |
594 | el.style.cssText = cssText; | |
595 | canvasElement.appendChild(el); | |
596 | ||
597 | var overlayEl = el.cloneNode(false); | |
598 | // Use a non transparent background. | |
599 | overlayEl.style.backgroundColor = 'red'; | |
600 | overlayEl.style.filter = 'alpha(opacity=0)'; | |
601 | canvasElement.appendChild(overlayEl); | |
602 | ||
603 | this.element_ = el; | |
604 | this.arcScaleX_ = 1; | |
605 | this.arcScaleY_ = 1; | |
606 | this.lineScale_ = 1; | |
607 | } | |
608 | ||
609 | var contextPrototype = CanvasRenderingContext2D_.prototype; | |
610 | contextPrototype.clearRect = function() { | |
611 | if (this.textMeasureEl_) { | |
612 | this.textMeasureEl_.removeNode(true); | |
613 | this.textMeasureEl_ = null; | |
614 | } | |
615 | this.element_.innerHTML = ''; | |
616 | }; | |
617 | ||
618 | contextPrototype.beginPath = function() { | |
619 | // TODO: Branch current matrix so that save/restore has no effect | |
620 | // as per safari docs. | |
621 | this.currentPath_ = []; | |
622 | }; | |
623 | ||
624 | contextPrototype.moveTo = function(aX, aY) { | |
625 | var p = getCoords(this, aX, aY); | |
626 | this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); | |
627 | this.currentX_ = p.x; | |
628 | this.currentY_ = p.y; | |
629 | }; | |
630 | ||
631 | contextPrototype.lineTo = function(aX, aY) { | |
632 | var p = getCoords(this, aX, aY); | |
633 | this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); | |
634 | ||
635 | this.currentX_ = p.x; | |
636 | this.currentY_ = p.y; | |
637 | }; | |
638 | ||
639 | contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, | |
640 | aCP2x, aCP2y, | |
641 | aX, aY) { | |
642 | var p = getCoords(this, aX, aY); | |
643 | var cp1 = getCoords(this, aCP1x, aCP1y); | |
644 | var cp2 = getCoords(this, aCP2x, aCP2y); | |
645 | bezierCurveTo(this, cp1, cp2, p); | |
646 | }; | |
647 | ||
648 | // Helper function that takes the already fixed cordinates. | |
649 | function bezierCurveTo(self, cp1, cp2, p) { | |
650 | self.currentPath_.push({ | |
651 | type: 'bezierCurveTo', | |
652 | cp1x: cp1.x, | |
653 | cp1y: cp1.y, | |
654 | cp2x: cp2.x, | |
655 | cp2y: cp2.y, | |
656 | x: p.x, | |
657 | y: p.y | |
658 | }); | |
659 | self.currentX_ = p.x; | |
660 | self.currentY_ = p.y; | |
661 | } | |
662 | ||
663 | contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { | |
664 | // the following is lifted almost directly from | |
665 | // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes | |
666 | ||
667 | var cp = getCoords(this, aCPx, aCPy); | |
668 | var p = getCoords(this, aX, aY); | |
669 | ||
670 | var cp1 = { | |
671 | x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), | |
672 | y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) | |
673 | }; | |
674 | var cp2 = { | |
675 | x: cp1.x + (p.x - this.currentX_) / 3.0, | |
676 | y: cp1.y + (p.y - this.currentY_) / 3.0 | |
677 | }; | |
678 | ||
679 | bezierCurveTo(this, cp1, cp2, p); | |
680 | }; | |
681 | ||
682 | contextPrototype.arc = function(aX, aY, aRadius, | |
683 | aStartAngle, aEndAngle, aClockwise) { | |
684 | aRadius *= Z; | |
685 | var arcType = aClockwise ? 'at' : 'wa'; | |
686 | ||
687 | var xStart = aX + mc(aStartAngle) * aRadius - Z2; | |
688 | var yStart = aY + ms(aStartAngle) * aRadius - Z2; | |
689 | ||
690 | var xEnd = aX + mc(aEndAngle) * aRadius - Z2; | |
691 | var yEnd = aY + ms(aEndAngle) * aRadius - Z2; | |
692 | ||
693 | // IE won't render arches drawn counter clockwise if xStart == xEnd. | |
694 | if (xStart == xEnd && !aClockwise) { | |
695 | xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something | |
696 | // that can be represented in binary | |
697 | } | |
698 | ||
699 | var p = getCoords(this, aX, aY); | |
700 | var pStart = getCoords(this, xStart, yStart); | |
701 | var pEnd = getCoords(this, xEnd, yEnd); | |
702 | ||
703 | this.currentPath_.push({type: arcType, | |
704 | x: p.x, | |
705 | y: p.y, | |
706 | radius: aRadius, | |
707 | xStart: pStart.x, | |
708 | yStart: pStart.y, | |
709 | xEnd: pEnd.x, | |
710 | yEnd: pEnd.y}); | |
711 | ||
712 | }; | |
713 | ||
714 | contextPrototype.rect = function(aX, aY, aWidth, aHeight) { | |
715 | this.moveTo(aX, aY); | |
716 | this.lineTo(aX + aWidth, aY); | |
717 | this.lineTo(aX + aWidth, aY + aHeight); | |
718 | this.lineTo(aX, aY + aHeight); | |
719 | this.closePath(); | |
720 | }; | |
721 | ||
722 | contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { | |
723 | var oldPath = this.currentPath_; | |
724 | this.beginPath(); | |
725 | ||
726 | this.moveTo(aX, aY); | |
727 | this.lineTo(aX + aWidth, aY); | |
728 | this.lineTo(aX + aWidth, aY + aHeight); | |
729 | this.lineTo(aX, aY + aHeight); | |
730 | this.closePath(); | |
731 | this.stroke(); | |
732 | ||
733 | this.currentPath_ = oldPath; | |
734 | }; | |
735 | ||
736 | contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { | |
737 | var oldPath = this.currentPath_; | |
738 | this.beginPath(); | |
739 | ||
740 | this.moveTo(aX, aY); | |
741 | this.lineTo(aX + aWidth, aY); | |
742 | this.lineTo(aX + aWidth, aY + aHeight); | |
743 | this.lineTo(aX, aY + aHeight); | |
744 | this.closePath(); | |
745 | this.fill(); | |
746 | ||
747 | this.currentPath_ = oldPath; | |
748 | }; | |
749 | ||
750 | contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { | |
751 | var gradient = new CanvasGradient_('gradient'); | |
752 | gradient.x0_ = aX0; | |
753 | gradient.y0_ = aY0; | |
754 | gradient.x1_ = aX1; | |
755 | gradient.y1_ = aY1; | |
756 | return gradient; | |
757 | }; | |
758 | ||
759 | contextPrototype.createRadialGradient = function(aX0, aY0, aR0, | |
760 | aX1, aY1, aR1) { | |
761 | var gradient = new CanvasGradient_('gradientradial'); | |
762 | gradient.x0_ = aX0; | |
763 | gradient.y0_ = aY0; | |
764 | gradient.r0_ = aR0; | |
765 | gradient.x1_ = aX1; | |
766 | gradient.y1_ = aY1; | |
767 | gradient.r1_ = aR1; | |
768 | return gradient; | |
769 | }; | |
770 | ||
771 | contextPrototype.drawImage = function(image, var_args) { | |
772 | var dx, dy, dw, dh, sx, sy, sw, sh; | |
773 | ||
774 | // to find the original width we overide the width and height | |
775 | var oldRuntimeWidth = image.runtimeStyle.width; | |
776 | var oldRuntimeHeight = image.runtimeStyle.height; | |
777 | image.runtimeStyle.width = 'auto'; | |
778 | image.runtimeStyle.height = 'auto'; | |
779 | ||
780 | // get the original size | |
781 | var w = image.width; | |
782 | var h = image.height; | |
783 | ||
784 | // and remove overides | |
785 | image.runtimeStyle.width = oldRuntimeWidth; | |
786 | image.runtimeStyle.height = oldRuntimeHeight; | |
787 | ||
788 | if (arguments.length == 3) { | |
789 | dx = arguments[1]; | |
790 | dy = arguments[2]; | |
791 | sx = sy = 0; | |
792 | sw = dw = w; | |
793 | sh = dh = h; | |
794 | } else if (arguments.length == 5) { | |
795 | dx = arguments[1]; | |
796 | dy = arguments[2]; | |
797 | dw = arguments[3]; | |
798 | dh = arguments[4]; | |
799 | sx = sy = 0; | |
800 | sw = w; | |
801 | sh = h; | |
802 | } else if (arguments.length == 9) { | |
803 | sx = arguments[1]; | |
804 | sy = arguments[2]; | |
805 | sw = arguments[3]; | |
806 | sh = arguments[4]; | |
807 | dx = arguments[5]; | |
808 | dy = arguments[6]; | |
809 | dw = arguments[7]; | |
810 | dh = arguments[8]; | |
811 | } else { | |
812 | throw Error('Invalid number of arguments'); | |
813 | } | |
814 | ||
815 | var d = getCoords(this, dx, dy); | |
816 | ||
817 | var w2 = sw / 2; | |
818 | var h2 = sh / 2; | |
819 | ||
820 | var vmlStr = []; | |
821 | ||
822 | var W = 10; | |
823 | var H = 10; | |
824 | ||
825 | // For some reason that I've now forgotten, using divs didn't work | |
826 | vmlStr.push(' <g_vml_:group', | |
827 | ' coordsize="', Z * W, ',', Z * H, '"', | |
828 | ' coordorigin="0,0"' , | |
829 | ' style="width:', W, 'px;height:', H, 'px;position:absolute;'); | |
830 | ||
831 | // If filters are necessary (rotation exists), create them | |
832 | // filters are bog-slow, so only create them if abbsolutely necessary | |
833 | // The following check doesn't account for skews (which don't exist | |
834 | // in the canvas spec (yet) anyway. | |
835 | ||
836 | if (this.m_[0][0] != 1 || this.m_[0][1] || | |
837 | this.m_[1][1] != 1 || this.m_[1][0]) { | |
838 | var filter = []; | |
839 | ||
840 | // Note the 12/21 reversal | |
841 | filter.push('M11=', this.m_[0][0], ',', | |
842 | 'M12=', this.m_[1][0], ',', | |
843 | 'M21=', this.m_[0][1], ',', | |
844 | 'M22=', this.m_[1][1], ',', | |
845 | 'Dx=', mr(d.x / Z), ',', | |
846 | 'Dy=', mr(d.y / Z), ''); | |
847 | ||
848 | // Bounding box calculation (need to minimize displayed area so that | |
849 | // filters don't waste time on unused pixels. | |
850 | var max = d; | |
851 | var c2 = getCoords(this, dx + dw, dy); | |
852 | var c3 = getCoords(this, dx, dy + dh); | |
853 | var c4 = getCoords(this, dx + dw, dy + dh); | |
854 | ||
855 | max.x = m.max(max.x, c2.x, c3.x, c4.x); | |
856 | max.y = m.max(max.y, c2.y, c3.y, c4.y); | |
857 | ||
858 | vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), | |
859 | 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', | |
860 | filter.join(''), ", sizingmethod='clip');"); | |
861 | ||
862 | } else { | |
863 | vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); | |
864 | } | |
865 | ||
866 | vmlStr.push(' ">' , | |
867 | '<g_vml_:image src="', image.src, '"', | |
868 | ' style="width:', Z * dw, 'px;', | |
869 | ' height:', Z * dh, 'px"', | |
870 | ' cropleft="', sx / w, '"', | |
871 | ' croptop="', sy / h, '"', | |
872 | ' cropright="', (w - sx - sw) / w, '"', | |
873 | ' cropbottom="', (h - sy - sh) / h, '"', | |
874 | ' />', | |
875 | '</g_vml_:group>'); | |
876 | ||
877 | this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); | |
878 | }; | |
879 | ||
880 | contextPrototype.stroke = function(aFill) { | |
881 | var W = 10; | |
882 | var H = 10; | |
883 | // Divide the shape into chunks if it's too long because IE has a limit | |
884 | // somewhere for how long a VML shape can be. This simple division does | |
885 | // not work with fills, only strokes, unfortunately. | |
886 | var chunkSize = 5000; | |
887 | ||
888 | var min = {x: null, y: null}; | |
889 | var max = {x: null, y: null}; | |
890 | ||
891 | for (var j = 0; j < this.currentPath_.length; j += chunkSize) { | |
892 | var lineStr = []; | |
893 | var lineOpen = false; | |
894 | ||
895 | lineStr.push('<g_vml_:shape', | |
896 | ' filled="', !!aFill, '"', | |
897 | ' style="position:absolute;width:', W, 'px;height:', H, 'px;"', | |
898 | ' coordorigin="0,0"', | |
899 | ' coordsize="', Z * W, ',', Z * H, '"', | |
900 | ' stroked="', !aFill, '"', | |
901 | ' path="'); | |
902 | ||
903 | var newSeq = false; | |
904 | ||
905 | for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { | |
906 | if (i % chunkSize == 0 && i > 0) { // move into position for next chunk | |
907 | lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); | |
908 | } | |
909 | ||
910 | var p = this.currentPath_[i]; | |
911 | var c; | |
912 | ||
913 | switch (p.type) { | |
914 | case 'moveTo': | |
915 | c = p; | |
916 | lineStr.push(' m ', mr(p.x), ',', mr(p.y)); | |
917 | break; | |
918 | case 'lineTo': | |
919 | lineStr.push(' l ', mr(p.x), ',', mr(p.y)); | |
920 | break; | |
921 | case 'close': | |
922 | lineStr.push(' x '); | |
923 | p = null; | |
924 | break; | |
925 | case 'bezierCurveTo': | |
926 | lineStr.push(' c ', | |
927 | mr(p.cp1x), ',', mr(p.cp1y), ',', | |
928 | mr(p.cp2x), ',', mr(p.cp2y), ',', | |
929 | mr(p.x), ',', mr(p.y)); | |
930 | break; | |
931 | case 'at': | |
932 | case 'wa': | |
933 | lineStr.push(' ', p.type, ' ', | |
934 | mr(p.x - this.arcScaleX_ * p.radius), ',', | |
935 | mr(p.y - this.arcScaleY_ * p.radius), ' ', | |
936 | mr(p.x + this.arcScaleX_ * p.radius), ',', | |
937 | mr(p.y + this.arcScaleY_ * p.radius), ' ', | |
938 | mr(p.xStart), ',', mr(p.yStart), ' ', | |
939 | mr(p.xEnd), ',', mr(p.yEnd)); | |
940 | break; | |
941 | } | |
942 | ||
943 | ||
944 | // TODO: Following is broken for curves due to | |
945 | // move to proper paths. | |
946 | ||
947 | // Figure out dimensions so we can do gradient fills | |
948 | // properly | |
949 | if (p) { | |
950 | if (min.x == null || p.x < min.x) { | |
951 | min.x = p.x; | |
952 | } | |
953 | if (max.x == null || p.x > max.x) { | |
954 | max.x = p.x; | |
955 | } | |
956 | if (min.y == null || p.y < min.y) { | |
957 | min.y = p.y; | |
958 | } | |
959 | if (max.y == null || p.y > max.y) { | |
960 | max.y = p.y; | |
961 | } | |
962 | } | |
963 | } | |
964 | lineStr.push(' ">'); | |
965 | ||
966 | if (!aFill) { | |
967 | appendStroke(this, lineStr); | |
968 | } else { | |
969 | appendFill(this, lineStr, min, max); | |
970 | } | |
971 | ||
972 | lineStr.push('</g_vml_:shape>'); | |
973 | ||
974 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); | |
975 | } | |
976 | }; | |
977 | ||
978 | function appendStroke(ctx, lineStr) { | |
979 | var a = processStyle(ctx.strokeStyle); | |
980 | var color = a.color; | |
981 | var opacity = a.alpha * ctx.globalAlpha; | |
982 | var lineWidth = ctx.lineScale_ * ctx.lineWidth; | |
983 | ||
984 | // VML cannot correctly render a line if the width is less than 1px. | |
985 | // In that case, we dilute the color to make the line look thinner. | |
986 | if (lineWidth < 1) { | |
987 | opacity *= lineWidth; | |
988 | } | |
989 | ||
990 | lineStr.push( | |
991 | '<g_vml_:stroke', | |
992 | ' opacity="', opacity, '"', | |
993 | ' joinstyle="', ctx.lineJoin, '"', | |
994 | ' miterlimit="', ctx.miterLimit, '"', | |
995 | ' endcap="', processLineCap(ctx.lineCap), '"', | |
996 | ' weight="', lineWidth, 'px"', | |
997 | ' color="', color, '" />' | |
998 | ); | |
999 | } | |
1000 | ||
1001 | function appendFill(ctx, lineStr, min, max) { | |
1002 | var fillStyle = ctx.fillStyle; | |
1003 | var arcScaleX = ctx.arcScaleX_; | |
1004 | var arcScaleY = ctx.arcScaleY_; | |
1005 | var width = max.x - min.x; | |
1006 | var height = max.y - min.y; | |
1007 | if (fillStyle instanceof CanvasGradient_) { | |
1008 | // TODO: Gradients transformed with the transformation matrix. | |
1009 | var angle = 0; | |
1010 | var focus = {x: 0, y: 0}; | |
1011 | ||
1012 | // additional offset | |
1013 | var shift = 0; | |
1014 | // scale factor for offset | |
1015 | var expansion = 1; | |
1016 | ||
1017 | if (fillStyle.type_ == 'gradient') { | |
1018 | var x0 = fillStyle.x0_ / arcScaleX; | |
1019 | var y0 = fillStyle.y0_ / arcScaleY; | |
1020 | var x1 = fillStyle.x1_ / arcScaleX; | |
1021 | var y1 = fillStyle.y1_ / arcScaleY; | |
1022 | var p0 = getCoords(ctx, x0, y0); | |
1023 | var p1 = getCoords(ctx, x1, y1); | |
1024 | var dx = p1.x - p0.x; | |
1025 | var dy = p1.y - p0.y; | |
1026 | angle = Math.atan2(dx, dy) * 180 / Math.PI; | |
1027 | ||
1028 | // The angle should be a non-negative number. | |
1029 | if (angle < 0) { | |
1030 | angle += 360; | |
1031 | } | |
1032 | ||
1033 | // Very small angles produce an unexpected result because they are | |
1034 | // converted to a scientific notation string. | |
1035 | if (angle < 1e-6) { | |
1036 | angle = 0; | |
1037 | } | |
1038 | } else { | |
1039 | var p0 = getCoords(ctx, fillStyle.x0_, fillStyle.y0_); | |
1040 | focus = { | |
1041 | x: (p0.x - min.x) / width, | |
1042 | y: (p0.y - min.y) / height | |
1043 | }; | |
1044 | ||
1045 | width /= arcScaleX * Z; | |
1046 | height /= arcScaleY * Z; | |
1047 | var dimension = m.max(width, height); | |
1048 | shift = 2 * fillStyle.r0_ / dimension; | |
1049 | expansion = 2 * fillStyle.r1_ / dimension - shift; | |
1050 | } | |
1051 | ||
1052 | // We need to sort the color stops in ascending order by offset, | |
1053 | // otherwise IE won't interpret it correctly. | |
1054 | var stops = fillStyle.colors_; | |
1055 | stops.sort(function(cs1, cs2) { | |
1056 | return cs1.offset - cs2.offset; | |
1057 | }); | |
1058 | ||
1059 | var length = stops.length; | |
1060 | var color1 = stops[0].color; | |
1061 | var color2 = stops[length - 1].color; | |
1062 | var opacity1 = stops[0].alpha * ctx.globalAlpha; | |
1063 | var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; | |
1064 | ||
1065 | var colors = []; | |
1066 | for (var i = 0; i < length; i++) { | |
1067 | var stop = stops[i]; | |
1068 | colors.push(stop.offset * expansion + shift + ' ' + stop.color); | |
1069 | } | |
1070 | ||
1071 | // When colors attribute is used, the meanings of opacity and o:opacity2 | |
1072 | // are reversed. | |
1073 | lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', | |
1074 | ' method="none" focus="100%"', | |
1075 | ' color="', color1, '"', | |
1076 | ' color2="', color2, '"', | |
1077 | ' colors="', colors.join(','), '"', | |
1078 | ' opacity="', opacity2, '"', | |
1079 | ' g_o_:opacity2="', opacity1, '"', | |
1080 | ' angle="', angle, '"', | |
1081 | ' focusposition="', focus.x, ',', focus.y, '" />'); | |
1082 | } else if (fillStyle instanceof CanvasPattern_) { | |
1083 | if (width && height) { | |
1084 | var deltaLeft = -min.x; | |
1085 | var deltaTop = -min.y; | |
1086 | lineStr.push('<g_vml_:fill', | |
1087 | ' position="', | |
1088 | deltaLeft / width * arcScaleX * arcScaleX, ',', | |
1089 | deltaTop / height * arcScaleY * arcScaleY, '"', | |
1090 | ' type="tile"', | |
1091 | // TODO: Figure out the correct size to fit the scale. | |
1092 | //' size="', w, 'px ', h, 'px"', | |
1093 | ' src="', fillStyle.src_, '" />'); | |
1094 | } | |
1095 | } else { | |
1096 | var a = processStyle(ctx.fillStyle); | |
1097 | var color = a.color; | |
1098 | var opacity = a.alpha * ctx.globalAlpha; | |
1099 | lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, | |
1100 | '" />'); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | contextPrototype.fill = function() { | |
1105 | this.stroke(true); | |
1106 | }; | |
1107 | ||
1108 | contextPrototype.closePath = function() { | |
1109 | this.currentPath_.push({type: 'close'}); | |
1110 | }; | |
1111 | ||
1112 | function getCoords(ctx, aX, aY) { | |
1113 | var m = ctx.m_; | |
1114 | return { | |
1115 | x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, | |
1116 | y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 | |
1117 | }; | |
1118 | } | |
1119 | contextPrototype.save = function() { | |
1120 | var o = {}; | |
1121 | copyState(this, o); | |
1122 | this.aStack_.push(o); | |
1123 | this.mStack_.push(this.m_); | |
1124 | this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); | |
1125 | }; | |
1126 | ||
1127 | contextPrototype.restore = function() { | |
1128 | if (this.aStack_.length) { | |
1129 | copyState(this.aStack_.pop(), this); | |
1130 | this.m_ = this.mStack_.pop(); | |
1131 | } | |
1132 | }; | |
1133 | ||
1134 | function matrixIsFinite(m) { | |
1135 | return isFinite(m[0][0]) && isFinite(m[0][1]) && | |
1136 | isFinite(m[1][0]) && isFinite(m[1][1]) && | |
1137 | isFinite(m[2][0]) && isFinite(m[2][1]); | |
1138 | } | |
1139 | ||
1140 | function setM(ctx, m, updateLineScale) { | |
1141 | if (!matrixIsFinite(m)) { | |
1142 | return; | |
1143 | } | |
1144 | ctx.m_ = m; | |
1145 | ||
1146 | if (updateLineScale) { | |
1147 | // Get the line scale. | |
1148 | // Determinant of this.m_ means how much the area is enlarged by the | |
1149 | // transformation. So its square root can be used as a scale factor | |
1150 | // for width. | |
1151 | var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; | |
1152 | ctx.lineScale_ = sqrt(abs(det)); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | contextPrototype.translate = function(aX, aY) { | |
1157 | var m1 = [ | |
1158 | [1, 0, 0], | |
1159 | [0, 1, 0], | |
1160 | [aX, aY, 1] | |
1161 | ]; | |
1162 | ||
1163 | setM(this, matrixMultiply(m1, this.m_), false); | |
1164 | }; | |
1165 | ||
1166 | contextPrototype.rotate = function(aRot) { | |
1167 | var c = mc(aRot); | |
1168 | var s = ms(aRot); | |
1169 | ||
1170 | var m1 = [ | |
1171 | [c, s, 0], | |
1172 | [-s, c, 0], | |
1173 | [0, 0, 1] | |
1174 | ]; | |
1175 | ||
1176 | setM(this, matrixMultiply(m1, this.m_), false); | |
1177 | }; | |
1178 | ||
1179 | contextPrototype.scale = function(aX, aY) { | |
1180 | this.arcScaleX_ *= aX; | |
1181 | this.arcScaleY_ *= aY; | |
1182 | var m1 = [ | |
1183 | [aX, 0, 0], | |
1184 | [0, aY, 0], | |
1185 | [0, 0, 1] | |
1186 | ]; | |
1187 | ||
1188 | setM(this, matrixMultiply(m1, this.m_), true); | |
1189 | }; | |
1190 | ||
1191 | contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { | |
1192 | var m1 = [ | |
1193 | [m11, m12, 0], | |
1194 | [m21, m22, 0], | |
1195 | [dx, dy, 1] | |
1196 | ]; | |
1197 | ||
1198 | setM(this, matrixMultiply(m1, this.m_), true); | |
1199 | }; | |
1200 | ||
1201 | contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { | |
1202 | var m = [ | |
1203 | [m11, m12, 0], | |
1204 | [m21, m22, 0], | |
1205 | [dx, dy, 1] | |
1206 | ]; | |
1207 | ||
1208 | setM(this, m, true); | |
1209 | }; | |
1210 | ||
1211 | /** | |
1212 | * The text drawing function. | |
1213 | * The maxWidth argument isn't taken in account, since no browser supports | |
1214 | * it yet. | |
1215 | */ | |
1216 | contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { | |
1217 | var m = this.m_, | |
1218 | delta = 1000, | |
1219 | left = 0, | |
1220 | right = delta, | |
1221 | offset = {x: 0, y: 0}, | |
1222 | lineStr = []; | |
1223 | ||
1224 | var fontStyle = getComputedStyle(processFontStyle(this.font), | |
1225 | this.element_); | |
1226 | ||
1227 | var fontStyleString = buildStyle(fontStyle); | |
1228 | ||
1229 | var elementStyle = this.element_.currentStyle; | |
1230 | var textAlign = this.textAlign.toLowerCase(); | |
1231 | switch (textAlign) { | |
1232 | case 'left': | |
1233 | case 'center': | |
1234 | case 'right': | |
1235 | break; | |
1236 | case 'end': | |
1237 | textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; | |
1238 | break; | |
1239 | case 'start': | |
1240 | textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; | |
1241 | break; | |
1242 | default: | |
1243 | textAlign = 'left'; | |
1244 | } | |
1245 | ||
1246 | // 1.75 is an arbitrary number, as there is no info about the text baseline | |
1247 | switch (this.textBaseline) { | |
1248 | case 'hanging': | |
1249 | case 'top': | |
1250 | offset.y = fontStyle.size / 1.75; | |
1251 | break; | |
1252 | case 'middle': | |
1253 | break; | |
1254 | default: | |
1255 | case null: | |
1256 | case 'alphabetic': | |
1257 | case 'ideographic': | |
1258 | case 'bottom': | |
1259 | offset.y = -fontStyle.size / 2.25; | |
1260 | break; | |
1261 | } | |
1262 | ||
1263 | switch(textAlign) { | |
1264 | case 'right': | |
1265 | left = delta; | |
1266 | right = 0.05; | |
1267 | break; | |
1268 | case 'center': | |
1269 | left = right = delta / 2; | |
1270 | break; | |
1271 | } | |
1272 | ||
1273 | var d = getCoords(this, x + offset.x, y + offset.y); | |
1274 | ||
1275 | lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', | |
1276 | ' coordsize="100 100" coordorigin="0 0"', | |
1277 | ' filled="', !stroke, '" stroked="', !!stroke, | |
1278 | '" style="position:absolute;width:1px;height:1px;">'); | |
1279 | ||
1280 | if (stroke) { | |
1281 | appendStroke(this, lineStr); | |
1282 | } else { | |
1283 | // TODO: Fix the min and max params. | |
1284 | appendFill(this, lineStr, {x: -left, y: 0}, | |
1285 | {x: right, y: fontStyle.size}); | |
1286 | } | |
1287 | ||
1288 | var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + | |
1289 | m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; | |
1290 | ||
1291 | var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); | |
1292 | ||
1293 | lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', | |
1294 | ' offset="', skewOffset, '" origin="', left ,' 0" />', | |
1295 | '<g_vml_:path textpathok="true" />', | |
1296 | '<g_vml_:textpath on="true" string="', | |
1297 | encodeHtmlAttribute(text), | |
1298 | '" style="v-text-align:', textAlign, | |
1299 | ';font:', encodeHtmlAttribute(fontStyleString), | |
1300 | '" /></g_vml_:line>'); | |
1301 | ||
1302 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); | |
1303 | }; | |
1304 | ||
1305 | contextPrototype.fillText = function(text, x, y, maxWidth) { | |
1306 | this.drawText_(text, x, y, maxWidth, false); | |
1307 | }; | |
1308 | ||
1309 | contextPrototype.strokeText = function(text, x, y, maxWidth) { | |
1310 | this.drawText_(text, x, y, maxWidth, true); | |
1311 | }; | |
1312 | ||
1313 | contextPrototype.measureText = function(text) { | |
1314 | if (!this.textMeasureEl_) { | |
1315 | var s = '<span style="position:absolute;' + | |
1316 | 'top:-20000px;left:0;padding:0;margin:0;border:none;' + | |
1317 | 'white-space:pre;"></span>'; | |
1318 | this.element_.insertAdjacentHTML('beforeEnd', s); | |
1319 | this.textMeasureEl_ = this.element_.lastChild; | |
1320 | } | |
1321 | var doc = this.element_.ownerDocument; | |
1322 | this.textMeasureEl_.innerHTML = ''; | |
1323 | this.textMeasureEl_.style.font = this.font; | |
1324 | // Don't use innerHTML or innerText because they allow markup/whitespace. | |
1325 | this.textMeasureEl_.appendChild(doc.createTextNode(text)); | |
1326 | return {width: this.textMeasureEl_.offsetWidth}; | |
1327 | }; | |
1328 | ||
1329 | /******** STUBS ********/ | |
1330 | contextPrototype.clip = function() { | |
1331 | // TODO: Implement | |
1332 | }; | |
1333 | ||
1334 | contextPrototype.arcTo = function() { | |
1335 | // TODO: Implement | |
1336 | }; | |
1337 | ||
1338 | contextPrototype.createPattern = function(image, repetition) { | |
1339 | return new CanvasPattern_(image, repetition); | |
1340 | }; | |
1341 | ||
1342 | // Gradient / Pattern Stubs | |
1343 | function CanvasGradient_(aType) { | |
1344 | this.type_ = aType; | |
1345 | this.x0_ = 0; | |
1346 | this.y0_ = 0; | |
1347 | this.r0_ = 0; | |
1348 | this.x1_ = 0; | |
1349 | this.y1_ = 0; | |
1350 | this.r1_ = 0; | |
1351 | this.colors_ = []; | |
1352 | } | |
1353 | ||
1354 | CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { | |
1355 | aColor = processStyle(aColor); | |
1356 | this.colors_.push({offset: aOffset, | |
1357 | color: aColor.color, | |
1358 | alpha: aColor.alpha}); | |
1359 | }; | |
1360 | ||
1361 | function CanvasPattern_(image, repetition) { | |
1362 | assertImageIsValid(image); | |
1363 | switch (repetition) { | |
1364 | case 'repeat': | |
1365 | case null: | |
1366 | case '': | |
1367 | this.repetition_ = 'repeat'; | |
1368 | break; | |
1369 | case 'repeat-x': | |
1370 | case 'repeat-y': | |
1371 | case 'no-repeat': | |
1372 | this.repetition_ = repetition; | |
1373 | break; | |
1374 | default: | |
1375 | throwException('SYNTAX_ERR'); | |
1376 | } | |
1377 | ||
1378 | this.src_ = image.src; | |
1379 | this.width_ = image.width; | |
1380 | this.height_ = image.height; | |
1381 | } | |
1382 | ||
1383 | function throwException(s) { | |
1384 | throw new DOMException_(s); | |
1385 | } | |
1386 | ||
1387 | function assertImageIsValid(img) { | |
1388 | if (!img || img.nodeType != 1 || img.tagName != 'IMG') { | |
1389 | throwException('TYPE_MISMATCH_ERR'); | |
1390 | } | |
1391 | if (img.readyState != 'complete') { | |
1392 | throwException('INVALID_STATE_ERR'); | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | function DOMException_(s) { | |
1397 | this.code = this[s]; | |
1398 | this.message = s +': DOM Exception ' + this.code; | |
1399 | } | |
1400 | var p = DOMException_.prototype = new Error; | |
1401 | p.INDEX_SIZE_ERR = 1; | |
1402 | p.DOMSTRING_SIZE_ERR = 2; | |
1403 | p.HIERARCHY_REQUEST_ERR = 3; | |
1404 | p.WRONG_DOCUMENT_ERR = 4; | |
1405 | p.INVALID_CHARACTER_ERR = 5; | |
1406 | p.NO_DATA_ALLOWED_ERR = 6; | |
1407 | p.NO_MODIFICATION_ALLOWED_ERR = 7; | |
1408 | p.NOT_FOUND_ERR = 8; | |
1409 | p.NOT_SUPPORTED_ERR = 9; | |
1410 | p.INUSE_ATTRIBUTE_ERR = 10; | |
1411 | p.INVALID_STATE_ERR = 11; | |
1412 | p.SYNTAX_ERR = 12; | |
1413 | p.INVALID_MODIFICATION_ERR = 13; | |
1414 | p.NAMESPACE_ERR = 14; | |
1415 | p.INVALID_ACCESS_ERR = 15; | |
1416 | p.VALIDATION_ERR = 16; | |
1417 | p.TYPE_MISMATCH_ERR = 17; | |
1418 | ||
1419 | // set up externs | |
1420 | G_vmlCanvasManager = G_vmlCanvasManager_; | |
1421 | CanvasRenderingContext2D = CanvasRenderingContext2D_; | |
1422 | CanvasGradient = CanvasGradient_; | |
1423 | CanvasPattern = CanvasPattern_; | |
1424 | DOMException = DOMException_; | |
1425 | })(); | |
1426 | ||
1427 | } // if |