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