1 | define(["dojo/_base/lang","dojo/_base/declare","dojo/_base/array", "dojo/_base/loader" /* dojo._getText */, |
---|
2 | "dojo/_base/xhr","./_base", "dojox/xml/DomParser", "dojox/html/metrics","./matrix"], |
---|
3 | function (lang,declare,arr,loader,xhr,gfx,xmlDomParser,HtmlMetrics,Matrix){ |
---|
4 | var _getText = function(url){ |
---|
5 | var result; |
---|
6 | xhr.get({url:url, sync:true, load:function(text){ // Note synchronous! |
---|
7 | result = text; |
---|
8 | }}); |
---|
9 | return result; |
---|
10 | }; |
---|
11 | |
---|
12 | lang.getObject("dojox.gfx.VectorText", true); |
---|
13 | |
---|
14 | lang.mixin(gfx, { |
---|
15 | vectorFontFitting: { |
---|
16 | NONE: 0, // render text according to passed size. |
---|
17 | FLOW: 1, // render text based on the passed width and size |
---|
18 | FIT: 2 // render text based on a passed viewbox. |
---|
19 | }, |
---|
20 | defaultVectorText: { |
---|
21 | type:"vectortext", x:0, y:0, width: null, height: null, |
---|
22 | text: "", align: "start", decoration: "none", fitting: 0, // vectorFontFitting.NONE |
---|
23 | leading: 1.5 // in ems. |
---|
24 | }, |
---|
25 | defaultVectorFont: { |
---|
26 | type:"vectorfont", size: "10pt", family: null |
---|
27 | }, |
---|
28 | _vectorFontCache: {}, |
---|
29 | _svgFontCache: {}, |
---|
30 | getVectorFont: function(/* String */url){ |
---|
31 | if(gfx._vectorFontCache[url]){ |
---|
32 | return gfx._vectorFontCache[url]; |
---|
33 | } |
---|
34 | return new gfx.VectorFont(url); |
---|
35 | } |
---|
36 | }); |
---|
37 | |
---|
38 | // TODO: Make up your mind. Module is called VectorText but it's creating and returning a global called VectorFont |
---|
39 | |
---|
40 | return declare("dojox.gfx.VectorFont", null, { |
---|
41 | // summary: |
---|
42 | // An implementation of the SVG Font 1.1 spec, using dojox/gfx. |
---|
43 | // |
---|
44 | // Basic interface: |
---|
45 | // | var f = new gfx.Font(url|string); |
---|
46 | // | surface||group.createVectorText(text) |
---|
47 | // | .setFill(fill) |
---|
48 | // | .setStroke(stroke) |
---|
49 | // | .setFont(fontStyleObject); |
---|
50 | // |
---|
51 | // The arguments passed to createVectorText are the same as you would |
---|
52 | // pass to surface||group.createText; the difference is that this |
---|
53 | // is entirely renderer-agnostic, and the return value is a subclass |
---|
54 | // of dojox/gfx.Group. |
---|
55 | // |
---|
56 | // Note also that the "defaultText" object is slightly different: |
---|
57 | // { type:"vectortext", x:0, y:0, width:null, height: null, |
---|
58 | // text: "", align: "start", decoration: "none" } |
---|
59 | // |
---|
60 | // ...as well as the "defaultVectorFont" object: |
---|
61 | // { type:"vectorfont", size:"10pt" } |
---|
62 | // |
---|
63 | // The reason for this should be obvious: most of the style for the font is defined |
---|
64 | // by the font object itself. |
---|
65 | // |
---|
66 | // Note that this will only render IF and WHEN you set the font. |
---|
67 | |
---|
68 | _entityRe: /&(quot|apos|lt|gt|amp|#x[^;]+|#\d+);/g, |
---|
69 | _decodeEntitySequence: function(str){ |
---|
70 | // unescape the unicode sequences |
---|
71 | |
---|
72 | // nothing to decode |
---|
73 | if(!str.match(this._entityRe)){ return; } // undefined |
---|
74 | var xmlEntityMap = { |
---|
75 | amp:"&", apos:"'", quot:'"', lt:"<", gt:">" |
---|
76 | }; |
---|
77 | |
---|
78 | // we have at least one encoded entity. |
---|
79 | var r, tmp=""; |
---|
80 | while((r=this._entityRe.exec(str))!==null){ |
---|
81 | if(r[1].charAt(1)=="x"){ |
---|
82 | tmp += String.fromCharCode(parseInt(r[1].slice(2), 16)); |
---|
83 | } |
---|
84 | else if(!isNaN(parseInt(r[1].slice(1),10))){ |
---|
85 | tmp += String.fromCharCode(parseInt(r[1].slice(1), 10)); |
---|
86 | } |
---|
87 | else { |
---|
88 | tmp += xmlEntityMap[r[1]] || ""; |
---|
89 | } |
---|
90 | } |
---|
91 | return tmp; // String |
---|
92 | }, |
---|
93 | _parse: function(/* String */svg, /* String */url){ |
---|
94 | // summary: |
---|
95 | // Take the loaded SVG Font definition file and convert the info |
---|
96 | // into things we can use. The SVG Font definition must follow |
---|
97 | // the SVG 1.1 Font specification. |
---|
98 | var doc = gfx._svgFontCache[url]||xmlDomParser.parse(svg); |
---|
99 | |
---|
100 | // font information |
---|
101 | var f = doc.documentElement.byName("font")[0], face = doc.documentElement.byName("font-face")[0]; |
---|
102 | var unitsPerEm = parseFloat(face.getAttribute("units-per-em")||1000, 10); |
---|
103 | var advance = { |
---|
104 | x: parseFloat(f.getAttribute("horiz-adv-x"), 10), |
---|
105 | y: parseFloat(f.getAttribute("vert-adv-y")||0, 10) |
---|
106 | }; |
---|
107 | if(!advance.y){ |
---|
108 | advance.y = unitsPerEm; |
---|
109 | } |
---|
110 | |
---|
111 | var origin = { |
---|
112 | horiz: { |
---|
113 | x: parseFloat(f.getAttribute("horiz-origin-x")||0, 10), |
---|
114 | y: parseFloat(f.getAttribute("horiz-origin-y")||0, 10) |
---|
115 | }, |
---|
116 | vert: { |
---|
117 | x: parseFloat(f.getAttribute("vert-origin-x")||0, 10), |
---|
118 | y: parseFloat(f.getAttribute("vert-origin-y")||0, 10) |
---|
119 | } |
---|
120 | }; |
---|
121 | |
---|
122 | // face information |
---|
123 | var family = face.getAttribute("font-family"), |
---|
124 | style = face.getAttribute("font-style")||"all", |
---|
125 | variant = face.getAttribute("font-variant")||"normal", |
---|
126 | weight = face.getAttribute("font-weight")||"all", |
---|
127 | stretch = face.getAttribute("font-stretch")||"normal", |
---|
128 | |
---|
129 | // additional info, may not be needed |
---|
130 | range = face.getAttribute("unicode-range")||"U+0-10FFFF", |
---|
131 | panose = face.getAttribute("panose-1") || "0 0 0 0 0 0 0 0 0 0", |
---|
132 | capHeight = face.getAttribute("cap-height"), |
---|
133 | ascent = parseFloat(face.getAttribute("ascent")||(unitsPerEm-origin.vert.y), 10), |
---|
134 | descent = parseFloat(face.getAttribute("descent")||origin.vert.y, 10), |
---|
135 | baseline = {}; |
---|
136 | |
---|
137 | // check for font-face-src/font-face-name |
---|
138 | var name = family; |
---|
139 | if(face.byName("font-face-name")[0]){ |
---|
140 | name = face.byName("font-face-name")[0].getAttribute("name"); |
---|
141 | } |
---|
142 | |
---|
143 | // see if this is cached already, and if so, forget the rest of the parsing. |
---|
144 | if(gfx._vectorFontCache[name]){ return; } |
---|
145 | |
---|
146 | // get any provided baseline alignment offsets. |
---|
147 | arr.forEach(["alphabetic", "ideographic", "mathematical", "hanging" ], function(attr){ |
---|
148 | var a = face.getAttribute(attr); |
---|
149 | if(a !== null /* be explicit, might be 0 */){ |
---|
150 | baseline[attr] = parseFloat(a, 10); |
---|
151 | } |
---|
152 | }); |
---|
153 | |
---|
154 | /* |
---|
155 | // TODO: decoration hinting. |
---|
156 | var decoration = { }; |
---|
157 | arr.forEach(["underline", "strikethrough", "overline"], function(type){ |
---|
158 | if(face.getAttribute(type+"-position")!=null){ |
---|
159 | decoration[type]={ }; |
---|
160 | } |
---|
161 | }); |
---|
162 | */ |
---|
163 | |
---|
164 | // missing glyph info |
---|
165 | var missing = parseFloat(doc.documentElement.byName("missing-glyph")[0].getAttribute("horiz-adv-x")||advance.x, 10); |
---|
166 | |
---|
167 | // glyph information |
---|
168 | var glyphs = {}, glyphsByName={}, g=doc.documentElement.byName("glyph"); |
---|
169 | arr.forEach(g, function(node){ |
---|
170 | // we are going to assume the following: |
---|
171 | // 1) we have the unicode attribute |
---|
172 | // 2) we have the name attribute |
---|
173 | // 3) we have the horiz-adv-x and d attributes. |
---|
174 | var code = node.getAttribute("unicode"), |
---|
175 | name = node.getAttribute("glyph-name"), |
---|
176 | xAdv = parseFloat(node.getAttribute("horiz-adv-x")||advance.x, 10), |
---|
177 | path = node.getAttribute("d"); |
---|
178 | |
---|
179 | // unescape the unicode sequences |
---|
180 | if(code.match(this._entityRe)){ |
---|
181 | code = this._decodeEntitySequence(code); |
---|
182 | } |
---|
183 | |
---|
184 | // build our glyph objects |
---|
185 | var o = { code: code, name: name, xAdvance: xAdv, path: path }; |
---|
186 | glyphs[code]=o; |
---|
187 | glyphsByName[name]=o; |
---|
188 | }, this); |
---|
189 | |
---|
190 | // now the fun part: look for kerning pairs. |
---|
191 | var hkern=doc.documentElement.byName("hkern"); |
---|
192 | arr.forEach(hkern, function(node, i){ |
---|
193 | var k = -parseInt(node.getAttribute("k"),10); |
---|
194 | // look for either a code or a name |
---|
195 | var u1=node.getAttribute("u1"), |
---|
196 | g1=node.getAttribute("g1"), |
---|
197 | u2=node.getAttribute("u2"), |
---|
198 | g2=node.getAttribute("g2"), |
---|
199 | gl; |
---|
200 | |
---|
201 | if(u1){ |
---|
202 | // the first of the pair is a sequence of unicode characters. |
---|
203 | // TODO: deal with unicode ranges and mulitple characters. |
---|
204 | u1 = this._decodeEntitySequence(u1); |
---|
205 | if(glyphs[u1]){ |
---|
206 | gl = glyphs[u1]; |
---|
207 | } |
---|
208 | } else { |
---|
209 | // we are referring to a name. |
---|
210 | // TODO: deal with multiple names |
---|
211 | if(glyphsByName[g1]){ |
---|
212 | gl = glyphsByName[g1]; |
---|
213 | } |
---|
214 | } |
---|
215 | |
---|
216 | if(gl){ |
---|
217 | if(!gl.kern){ gl.kern = {}; } |
---|
218 | if(u2){ |
---|
219 | // see the notes above. |
---|
220 | u2 = this._decodeEntitySequence(u2); |
---|
221 | gl.kern[u2] = { x: k }; |
---|
222 | } else { |
---|
223 | if(glyphsByName[g2]){ |
---|
224 | gl.kern[glyphsByName[g2].code] = { x: k }; |
---|
225 | } |
---|
226 | } |
---|
227 | } |
---|
228 | }, this); |
---|
229 | |
---|
230 | // pop the final definition in the font cache. |
---|
231 | lang.mixin(this, { |
---|
232 | family: family, |
---|
233 | name: name, |
---|
234 | style: style, |
---|
235 | variant: variant, |
---|
236 | weight: weight, |
---|
237 | stretch: stretch, |
---|
238 | range: range, |
---|
239 | viewbox: { width: unitsPerEm, height: unitsPerEm }, |
---|
240 | origin: origin, |
---|
241 | advance: lang.mixin(advance, { |
---|
242 | missing:{ x: missing, y: missing } |
---|
243 | }), |
---|
244 | ascent: ascent, |
---|
245 | descent: descent, |
---|
246 | baseline: baseline, |
---|
247 | glyphs: glyphs |
---|
248 | }); |
---|
249 | |
---|
250 | // cache the parsed font |
---|
251 | gfx._vectorFontCache[name] = this; |
---|
252 | gfx._vectorFontCache[url] = this; |
---|
253 | if(name!=family && !gfx._vectorFontCache[family]){ |
---|
254 | gfx._vectorFontCache[family] = this; |
---|
255 | } |
---|
256 | |
---|
257 | // cache the doc |
---|
258 | if(!gfx._svgFontCache[url]){ |
---|
259 | gfx._svgFontCache[url]=doc; |
---|
260 | } |
---|
261 | }, |
---|
262 | _clean: function(){ |
---|
263 | // summary: |
---|
264 | // Clean off all of the given mixin parameters. |
---|
265 | var name = this.name, family = this.family; |
---|
266 | arr.forEach(["family","name","style","variant", |
---|
267 | "weight","stretch","range","viewbox", |
---|
268 | "origin","advance","ascent","descent", |
---|
269 | "baseline","glyphs"], function(prop){ |
---|
270 | try{ delete this[prop]; } catch(e) { } |
---|
271 | }, this); |
---|
272 | |
---|
273 | // try to pull out of the font cache. |
---|
274 | if(gfx._vectorFontCache[name]){ |
---|
275 | delete gfx._vectorFontCache[name]; |
---|
276 | } |
---|
277 | if(gfx._vectorFontCache[family]){ |
---|
278 | delete gfx._vectorFontCache[family]; |
---|
279 | } |
---|
280 | return this; |
---|
281 | }, |
---|
282 | |
---|
283 | constructor: function(/* String|dojo._Url */url){ |
---|
284 | // summary: |
---|
285 | // Create this font object based on the SVG Font definition at url. |
---|
286 | // url: |
---|
287 | // An url pointing to the SVG Font definition. |
---|
288 | this._defaultLeading = 1.5; |
---|
289 | if(url!==undefined){ |
---|
290 | this.load(url); |
---|
291 | } |
---|
292 | }, |
---|
293 | load: function(/* String|dojo._Url */url){ |
---|
294 | // summary: |
---|
295 | // Load the passed SVG and send it to the parser for parsing. |
---|
296 | // url: |
---|
297 | // The svg to parse. |
---|
298 | this.onLoadBegin(url.toString()); |
---|
299 | this._parse( |
---|
300 | gfx._svgFontCache[url.toString()]||_getText(url.toString()), |
---|
301 | url.toString() |
---|
302 | ); |
---|
303 | this.onLoad(this); |
---|
304 | return this; // dojox/gfx.VectorFont |
---|
305 | }, |
---|
306 | initialized: function(){ |
---|
307 | // summary: |
---|
308 | // Return if we've loaded a font def, and the parsing was successful. |
---|
309 | return (this.glyphs!==null); // Boolean |
---|
310 | }, |
---|
311 | |
---|
312 | // preset round to 3 places. |
---|
313 | _round: function(n){ return Math.round(1000*n)/1000; }, |
---|
314 | _leading: function(unit){ return this.viewbox.height * (unit||this._defaultLeading); }, |
---|
315 | _normalize: function(str){ |
---|
316 | return str.replace(/\s+/g, String.fromCharCode(0x20)); |
---|
317 | }, |
---|
318 | |
---|
319 | _getWidth: function(glyphs){ |
---|
320 | var w=0, last=0, lastGlyph=null; |
---|
321 | arr.forEach(glyphs, function(glyph, i){ |
---|
322 | last=glyph.xAdvance; |
---|
323 | if(glyphs[i] && glyph.kern && glyph.kern[glyphs[i].code]){ |
---|
324 | last += glyph.kern[glyphs[i].code].x; |
---|
325 | } |
---|
326 | w += last; |
---|
327 | lastGlyph = glyph; |
---|
328 | }); |
---|
329 | |
---|
330 | // if the last glyph was a space, pull it off. |
---|
331 | if(lastGlyph && lastGlyph.code == " "){ |
---|
332 | w -= lastGlyph.xAdvance; |
---|
333 | } |
---|
334 | |
---|
335 | return this._round(w/*-last*/); |
---|
336 | }, |
---|
337 | |
---|
338 | _getLongestLine: function(lines){ |
---|
339 | var maxw=0, idx=0; |
---|
340 | arr.forEach(lines, function(line, i){ |
---|
341 | var max = Math.max(maxw, this._getWidth(line)); |
---|
342 | if(max > maxw){ |
---|
343 | maxw = max; |
---|
344 | idx=i; |
---|
345 | } |
---|
346 | }, this); |
---|
347 | return { width: maxw, index: idx, line: lines[idx] }; |
---|
348 | }, |
---|
349 | |
---|
350 | _trim: function(lines){ |
---|
351 | var fn = function(arr){ |
---|
352 | // check if the first or last character is a space and if so, remove it. |
---|
353 | if(!arr.length){ return; } |
---|
354 | if(arr[arr.length-1].code == " "){ arr.splice(arr.length-1, 1); } |
---|
355 | if(!arr.length){ return; } |
---|
356 | if(arr[0].code == " "){ arr.splice(0, 1); } |
---|
357 | }; |
---|
358 | |
---|
359 | if(lang.isArray(lines[0])){ |
---|
360 | // more than one line. |
---|
361 | arr.forEach(lines, fn); |
---|
362 | } else { |
---|
363 | fn(lines); |
---|
364 | } |
---|
365 | return lines; |
---|
366 | }, |
---|
367 | |
---|
368 | _split: function(chars, nLines){ |
---|
369 | // summary: |
---|
370 | // split passed chars into nLines by finding the closest whitespace. |
---|
371 | var w = this._getWidth(chars), |
---|
372 | limit = Math.floor(w/nLines), |
---|
373 | lines = [], |
---|
374 | cw = 0, |
---|
375 | c = [], |
---|
376 | found = false; |
---|
377 | |
---|
378 | for(var i=0, l=chars.length; i<l; i++){ |
---|
379 | if(chars[i].code == " "){ found = true; } |
---|
380 | cw += chars[i].xAdvance; |
---|
381 | if(i+1<l && chars[i].kern && chars[i].kern[chars[i+1].code]){ |
---|
382 | cw += chars[i].kern[chars[i+1].code].x; |
---|
383 | } |
---|
384 | |
---|
385 | if(cw>=limit){ |
---|
386 | var chr=chars[i]; |
---|
387 | while(found && chr.code != " " && i>=0){ |
---|
388 | chr = c.pop(); i--; |
---|
389 | } |
---|
390 | lines.push(c); |
---|
391 | c=[]; |
---|
392 | cw=0; |
---|
393 | found=false; |
---|
394 | } |
---|
395 | c.push(chars[i]); |
---|
396 | } |
---|
397 | if(c.length){ lines.push(c); } |
---|
398 | // "trim" it |
---|
399 | return this._trim(lines); |
---|
400 | }, |
---|
401 | |
---|
402 | _getSizeFactor: function(size){ |
---|
403 | // given the size, return a scaling factor based on the height of the |
---|
404 | // font as defined in the font definition file. |
---|
405 | size += ""; // force the string cast. |
---|
406 | var metrics = HtmlMetrics.getCachedFontMeasurements(), |
---|
407 | height=this.viewbox.height, |
---|
408 | f=metrics["1em"], |
---|
409 | unit=parseFloat(size, 10); // the default. |
---|
410 | if(size.indexOf("em")>-1){ |
---|
411 | return this._round((metrics["1em"]*unit)/height); |
---|
412 | } |
---|
413 | else if(size.indexOf("ex")>-1){ |
---|
414 | return this._round((metrics["1ex"]*unit)/height); |
---|
415 | } |
---|
416 | else if(size.indexOf("pt")>-1){ |
---|
417 | return this._round(((metrics["12pt"] / 12)*unit) / height); |
---|
418 | } |
---|
419 | else if(size.indexOf("px")>-1){ |
---|
420 | return this._round(((metrics["16px"] / 16)*unit) / height); |
---|
421 | } |
---|
422 | else if(size.indexOf("%")>-1){ |
---|
423 | return this._round((metrics["1em"]*(unit / 100)) / height); |
---|
424 | } |
---|
425 | else { |
---|
426 | f=metrics[size]||metrics.medium; |
---|
427 | return this._round(f/height); |
---|
428 | } |
---|
429 | }, |
---|
430 | |
---|
431 | _getFitFactor: function(lines, w, h, l){ |
---|
432 | // summary: |
---|
433 | // Find the scaling factor for the given phrase set. |
---|
434 | if(!h){ |
---|
435 | // if no height was passed, we assume an array of glyphs instead of lines. |
---|
436 | return this._round(w/this._getWidth(lines)); |
---|
437 | } else { |
---|
438 | var maxw = this._getLongestLine(lines).width, |
---|
439 | maxh = (lines.length*(this.viewbox.height*l))-((this.viewbox.height*l)-this.viewbox.height); |
---|
440 | return this._round(Math.min(w/maxw, h/maxh)); |
---|
441 | } |
---|
442 | }, |
---|
443 | _getBestFit: function(chars, w, h, ldng){ |
---|
444 | // summary: |
---|
445 | // Get the best number of lines to return given w and h. |
---|
446 | var limit=32, |
---|
447 | factor=0, |
---|
448 | lines=limit; |
---|
449 | while(limit>0){ |
---|
450 | var f=this._getFitFactor(this._split(chars, limit), w, h, ldng); |
---|
451 | if(f>factor){ |
---|
452 | factor = f; |
---|
453 | lines=limit; |
---|
454 | } |
---|
455 | limit--; |
---|
456 | } |
---|
457 | return { scale: factor, lines: this._split(chars, lines) }; |
---|
458 | }, |
---|
459 | |
---|
460 | _getBestFlow: function(chars, w, scale){ |
---|
461 | // summary: |
---|
462 | // Based on the given scale, do the best line splitting possible. |
---|
463 | var lines = [], |
---|
464 | cw = 0, |
---|
465 | c = [], |
---|
466 | found = false; |
---|
467 | for(var i=0, l=chars.length; i<l; i++){ |
---|
468 | if(chars[i].code == " "){ found = true; } |
---|
469 | var tw = chars[i].xAdvance; |
---|
470 | if(i+1<l && chars[i].kern && chars[i].kern[chars[i+1].code]){ |
---|
471 | tw += chars[i].kern[chars[i+1].code].x; |
---|
472 | } |
---|
473 | cw += scale*tw; |
---|
474 | |
---|
475 | if(cw>=w){ |
---|
476 | var chr=chars[i]; |
---|
477 | while(found && chr.code != " " && i>=0){ |
---|
478 | chr = c.pop(); i--; |
---|
479 | } |
---|
480 | lines.push(c); |
---|
481 | c=[]; |
---|
482 | cw=0; |
---|
483 | found=false; |
---|
484 | } |
---|
485 | c.push(chars[i]); |
---|
486 | } |
---|
487 | if(c.length){ lines.push(c); } |
---|
488 | return this._trim(lines); |
---|
489 | }, |
---|
490 | |
---|
491 | // public functions |
---|
492 | getWidth: function(/* String */text, /* Float? */scale){ |
---|
493 | // summary: |
---|
494 | // Get the width of the rendered text without actually rendering it. |
---|
495 | // text: |
---|
496 | // The string to measure. |
---|
497 | // scale: |
---|
498 | // an optional scaling factor. |
---|
499 | return this._getWidth(arr.map(this._normalize(text).split(""), function(chr){ |
---|
500 | return this.glyphs[chr] || { xAdvance: this.advance.missing.x }; |
---|
501 | }, this)) * (scale || 1); // Float |
---|
502 | }, |
---|
503 | getLineHeight: function(/* Float? */scale){ |
---|
504 | // summary: |
---|
505 | // return the height of a single line, sans leading, based on scale. |
---|
506 | // scale: |
---|
507 | // an optional scaling factor. |
---|
508 | return this.viewbox.height * (scale || 1); // Float |
---|
509 | }, |
---|
510 | |
---|
511 | // A note: |
---|
512 | // Many SVG exports do not include information such as x-height, caps-height |
---|
513 | // and other coords that may help alignment. We can calc the baseline and |
---|
514 | // we can get a mean line (i.e. center alignment) but that's about all, reliably. |
---|
515 | getCenterline: function(/* Float? */scale){ |
---|
516 | // summary: |
---|
517 | // return the y coordinate that is the center of the viewbox. |
---|
518 | // scale: |
---|
519 | // an optional scaling factor. |
---|
520 | return (scale||1) * (this.viewbox.height/2); |
---|
521 | }, |
---|
522 | getBaseline: function(/* Float? */scale){ |
---|
523 | // summary: |
---|
524 | // Find the baseline coord for alignment; adjust for scale if passed. |
---|
525 | // scale: |
---|
526 | // an optional scaling factor. |
---|
527 | return (scale||1) * (this.viewbox.height+this.descent); // Float |
---|
528 | }, |
---|
529 | |
---|
530 | draw: function( |
---|
531 | /* dojox/gfx.Container */group, |
---|
532 | /* dojox/gfx.Text */ textArgs, |
---|
533 | /* dojox/gfx.Font */fontArgs, |
---|
534 | /* dojox/gfx.Fill */fillArgs, |
---|
535 | /* dojox/gfx.Stroke */strokeArgs){ |
---|
536 | // summary: |
---|
537 | // based on the passed parameters, draw the given text using paths |
---|
538 | // defined by this font. |
---|
539 | // description: |
---|
540 | // The main method of a VectorFont, draw() will take a text fragment |
---|
541 | // and render it in a set of groups and paths based on the parameters |
---|
542 | // passed. |
---|
543 | // |
---|
544 | // The basics of drawing text are simple enough: pass it your text as |
---|
545 | // part of the textArgs object, pass size and family info as part of |
---|
546 | // the fontArgs object, pass at least a color as the fillArgs object, |
---|
547 | // and if you are looking to create an outline, pass the strokeArgs |
---|
548 | // object as well. fillArgs and strokeArgs are the same as any other |
---|
549 | // gfx fill and stroke arguments; they are simply applied to any path |
---|
550 | // object generated by this method. |
---|
551 | // |
---|
552 | // Resulting GFX structure |
---|
553 | // ----------------------- |
---|
554 | // |
---|
555 | // The result of this function is a set of gfx objects in the following structure: |
---|
556 | // |
---|
557 | // | gfx.Group // the parent group generated by this function |
---|
558 | // | + gfx.Group[] // a group generated for each line of text |
---|
559 | // | + gfx.Path[] // each glyph/character in the text |
---|
560 | // |
---|
561 | // Scaling transformations (i.e. making the generated text the correct size) |
---|
562 | // are always applied to the parent Group that is generated (i.e. the top |
---|
563 | // node in the above example). In theory, if you are looking to do any kind |
---|
564 | // of other transformations (such as a translation), you should apply it to |
---|
565 | // the group reference you pass to this method. If you find that you need |
---|
566 | // to apply transformations to the group that is returned by this method, |
---|
567 | // you will need to reapply the scaling transformation as the *last* transform, |
---|
568 | // like so: |
---|
569 | // |
---|
570 | // | textGroup.setTransform(new matrix.Matrix2D([ |
---|
571 | // | matrix.translate({ dx: dx, dy: dy }), |
---|
572 | // | textGroup.getTransform() |
---|
573 | // | ])); |
---|
574 | // |
---|
575 | // In general, this should never be necessary unless you are doing advanced |
---|
576 | // placement of your text. |
---|
577 | // |
---|
578 | // Advanced Layout Functionality |
---|
579 | // ----------------------------- |
---|
580 | // |
---|
581 | // In addition to straight text fragments, draw() supports a few advanced |
---|
582 | // operations not normally available with vector graphics: |
---|
583 | // |
---|
584 | // - Flow operations (i.e. wrap to a given width) |
---|
585 | // - Fitting operations (i.e. find a best fit to a given rectangle) |
---|
586 | // |
---|
587 | // To enable either, pass a `fitting` property along with the textArgs object. |
---|
588 | // The possible values are contained in the dojox/gfx.vectorFontFitting enum |
---|
589 | // (NONE, FLOW, FIT). |
---|
590 | // |
---|
591 | // `Flow fitting` |
---|
592 | // Flow fitting requires both a passed size (in the fontArgs object) and a |
---|
593 | // width (passed with the textArgs object). draw() will attempt to split the |
---|
594 | // passed text up into lines, at the closest whitespace according to the |
---|
595 | // passed width. If a width is missing, it will revert to NONE. |
---|
596 | // |
---|
597 | // `Best fit fitting` |
---|
598 | // Doing a "best fit" means taking the passed text, and finding the largest |
---|
599 | // size and line breaks so that it is the closest fit possible. With best |
---|
600 | // fit, any size arguments are ignored; if a height is missing, it will revert |
---|
601 | // to NONE. |
---|
602 | // |
---|
603 | // Other notes |
---|
604 | // ----------- |
---|
605 | // |
---|
606 | // `a11y` |
---|
607 | // Since the results of this method are rendering using pure paths (think |
---|
608 | // "convert to outlines" in Adobe Illustrator), any text rendered by this |
---|
609 | // code is NOT considered a11y-friendly. If a11y is a requirement, we |
---|
610 | // suggest using other, more a11y-friendly methods. |
---|
611 | // |
---|
612 | // `Font sources` |
---|
613 | // Always make sure that you are legally allowed to use any fonts that you |
---|
614 | // convert to SVG format; we claim no responsibility for any licensing |
---|
615 | // infractions that may be caused by the use of this code. |
---|
616 | // returns: dojox/gfx.Group |
---|
617 | if(!this.initialized()){ |
---|
618 | throw new Error("dojox.gfx.VectorFont.draw(): we have not been initialized yet."); |
---|
619 | } |
---|
620 | // TODO: BIDI handling. Deal with layout/alignments based on font parameters. |
---|
621 | |
---|
622 | // start by creating the overall group. This is the INNER group (the caller |
---|
623 | // should be the outer). |
---|
624 | var g = group.createGroup(); |
---|
625 | |
---|
626 | // do the x/y translation on the parent group |
---|
627 | // FIXME: this is probably not the best way of doing this. |
---|
628 | if(textArgs.x || textArgs.y){ |
---|
629 | group.applyTransform({ dx: textArgs.x||0, dy: textArgs.y||0 }); |
---|
630 | } |
---|
631 | |
---|
632 | // go get the glyph array. |
---|
633 | var text = arr.map(this._normalize(textArgs.text).split(""), function(chr){ |
---|
634 | return this.glyphs[chr] || { path:null, xAdvance: this.advance.missing.x }; |
---|
635 | }, this); |
---|
636 | |
---|
637 | // determine the font style info, ignore decoration. |
---|
638 | var size = fontArgs.size, |
---|
639 | fitting = textArgs.fitting, |
---|
640 | width = textArgs.width, |
---|
641 | height = textArgs.height, |
---|
642 | align = textArgs.align, |
---|
643 | leading = textArgs.leading||this._defaultLeading; |
---|
644 | |
---|
645 | // figure out if we have to do fitting at all. |
---|
646 | if(fitting){ |
---|
647 | // more than zero. |
---|
648 | if((fitting==gfx.vectorFontFitting.FLOW && !width) || (fitting==gfx.vectorFontFitting.FIT && (!width || !height))){ |
---|
649 | // reset the fitting if we don't have everything we need. |
---|
650 | fitting = gfx.vectorFontFitting.NONE; |
---|
651 | } |
---|
652 | } |
---|
653 | |
---|
654 | // set up the lines array and the scaling factor. |
---|
655 | var lines, scale; |
---|
656 | switch(fitting){ |
---|
657 | case gfx.vectorFontFitting.FIT: |
---|
658 | var o=this._getBestFit(text, width, height, leading); |
---|
659 | scale = o.scale; |
---|
660 | lines = o.lines; |
---|
661 | break; |
---|
662 | |
---|
663 | case gfx.vectorFontFitting.FLOW: |
---|
664 | scale = this._getSizeFactor(size); |
---|
665 | lines = this._getBestFlow(text, width, scale); |
---|
666 | break; |
---|
667 | |
---|
668 | default: |
---|
669 | scale = this._getSizeFactor(size); |
---|
670 | lines = [ text ]; |
---|
671 | |
---|
672 | } |
---|
673 | |
---|
674 | // make sure lines doesn't have any empty lines. |
---|
675 | lines = arr.filter(lines, function(item){ |
---|
676 | return item.length>0; |
---|
677 | }); |
---|
678 | |
---|
679 | // let's start drawing. |
---|
680 | var cy = 0, |
---|
681 | maxw = this._getLongestLine(lines).width; |
---|
682 | |
---|
683 | for(var i=0, l=lines.length; i<l; i++){ |
---|
684 | var cx = 0, |
---|
685 | line=lines[i], |
---|
686 | linew = this._getWidth(line), |
---|
687 | lg=g.createGroup(); |
---|
688 | |
---|
689 | // loop through the glyphs and add them to the line group (lg) |
---|
690 | for (var j=0; j<line.length; j++){ |
---|
691 | var glyph=line[j]; |
---|
692 | if(glyph.path!==null){ |
---|
693 | var p = lg.createPath(glyph.path).setFill(fillArgs); |
---|
694 | if(strokeArgs){ p.setStroke(strokeArgs); } |
---|
695 | p.setTransform([ |
---|
696 | Matrix.flipY, |
---|
697 | Matrix.translate(cx, -this.viewbox.height-this.descent) |
---|
698 | ]); |
---|
699 | } |
---|
700 | cx += glyph.xAdvance; |
---|
701 | if(j+1<line.length && glyph.kern && glyph.kern[line[j+1].code]){ |
---|
702 | cx += glyph.kern[line[j+1].code].x; |
---|
703 | } |
---|
704 | } |
---|
705 | |
---|
706 | // transform the line group. |
---|
707 | var dx = 0; |
---|
708 | if(align=="middle"){ dx = maxw/2 - linew/2; } |
---|
709 | else if(align=="end"){ dx = maxw - linew; } |
---|
710 | lg.setTransform({ dx: dx, dy: cy }); |
---|
711 | cy += this.viewbox.height * leading; |
---|
712 | } |
---|
713 | |
---|
714 | // scale the group |
---|
715 | g.setTransform(Matrix.scale(scale)); |
---|
716 | |
---|
717 | // return the overall group |
---|
718 | return g; // dojox/gfx.Group |
---|
719 | }, |
---|
720 | |
---|
721 | // events |
---|
722 | onLoadBegin: function(/* String */url){ }, |
---|
723 | onLoad: function(/* dojox/gfx/VectorText */font){ } |
---|
724 | }); |
---|
725 | |
---|
726 | // TODO: dojox/gfx integration |
---|
727 | /* |
---|
728 | |
---|
729 | // Inherit from Group but attach Text properties to it. |
---|
730 | dojo.declare("dojox.gfx.VectorText", dojox.gfx.Group, { |
---|
731 | constructor: function(rawNode){ |
---|
732 | dojox.gfx.Group._init.call(this); |
---|
733 | this.fontStyle = null; |
---|
734 | }, |
---|
735 | |
---|
736 | // private methods. |
---|
737 | _setFont: function(){ |
---|
738 | // render this using the font code. |
---|
739 | var f = this.fontStyle; |
---|
740 | var font = dojox.gfx._vectorFontCache[f.family]; |
---|
741 | if(!font){ |
---|
742 | throw new Error("dojox.gfx.VectorText._setFont: the passed font family '" + f.family + "' was not found."); |
---|
743 | } |
---|
744 | |
---|
745 | // the actual rendering belongs to the font itself. |
---|
746 | font.draw(this, this.shape, this.fontStyle, this.fillStyle, this.strokeStyle); |
---|
747 | }, |
---|
748 | |
---|
749 | getFont: function(){ return this.fontStyle; }, |
---|
750 | |
---|
751 | // overridden public methods. |
---|
752 | setShape: function(newShape){ |
---|
753 | dojox.gfx.Group.setShape.call(this); |
---|
754 | this.shape = dojox.gfx.makeParameters(this.shape, newShape); |
---|
755 | this.bbox = null; |
---|
756 | this._setFont(); |
---|
757 | return this; |
---|
758 | }, |
---|
759 | |
---|
760 | // if we've been drawing, we should have exactly one child, and that |
---|
761 | // child will contain the real children. |
---|
762 | setFill: function(fill){ |
---|
763 | this.fillStyle = fill; |
---|
764 | if(this.children[0]){ |
---|
765 | dojo.forEach(this.children[0].children, function(group){ |
---|
766 | dojo.forEach(group.children, function(path){ |
---|
767 | path.setFill(fill); |
---|
768 | }); |
---|
769 | }, this); |
---|
770 | } |
---|
771 | return this; |
---|
772 | }, |
---|
773 | setStroke: function(stroke){ |
---|
774 | this.strokeStyle = stroke; |
---|
775 | if(this.children[0]){ |
---|
776 | dojo.forEach(this.children[0].children, function(group){ |
---|
777 | dojo.forEach(group.children, function(path){ |
---|
778 | path.setStroke(stroke); |
---|
779 | }); |
---|
780 | }, this); |
---|
781 | } |
---|
782 | return this; |
---|
783 | }, |
---|
784 | |
---|
785 | setFont: function(newFont){ |
---|
786 | // this will do the real rendering. |
---|
787 | this.fontStyle = typeof newFont == "string" ? dojox.gfx.splitFontString(newFont) |
---|
788 | : dojox.gfx.makeParameters(dojox.gfx.defaultFont, newFont); |
---|
789 | this._setFont(); |
---|
790 | return this; |
---|
791 | }, |
---|
792 | |
---|
793 | getBoundingBox: function(){ |
---|
794 | return this.bbox; |
---|
795 | } |
---|
796 | }); |
---|
797 | |
---|
798 | // TODO: figure out how to add this to container objects! |
---|
799 | dojox.gfx.shape.Creator.createVectorText = function(text){ |
---|
800 | return this.createObject(dojox.gfx.VectorText, text); |
---|
801 | } |
---|
802 | */ |
---|
803 | }); |
---|