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mglyph.js (4131B)

      1 /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
      2 /* vim: set ts=2 et sw=2 tw=80: */
      3 
      4 /*************************************************************
      5  *
      6  *  MathJax/jax/output/SVG/autoload/mglyph.js
      7  *  
      8  *  Implements the SVG output for <mglyph> elements.
      9  *
     10  *  ---------------------------------------------------------------------
     11  *  
     12  *  Copyright (c) 2011-2015 The MathJax Consortium
     13  * 
     14  *  Licensed under the Apache License, Version 2.0 (the "License");
     15  *  you may not use this file except in compliance with the License.
     16  *  You may obtain a copy of the License at
     17  * 
     18  *      http://www.apache.org/licenses/LICENSE-2.0
     19  * 
     20  *  Unless required by applicable law or agreed to in writing, software
     21  *  distributed under the License is distributed on an "AS IS" BASIS,
     22  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     23  *  See the License for the specific language governing permissions and
     24  *  limitations under the License.
     25  */
     26 
     27 MathJax.Hub.Register.StartupHook("SVG Jax Ready",function () {
     28   var VERSION = "2.6.0";
     29   var MML = MathJax.ElementJax.mml,
     30       SVG = MathJax.OutputJax.SVG,
     31       BBOX = SVG.BBOX,
     32       LOCALE = MathJax.Localization;
     33   
     34   var XLINKNS = "http://www.w3.org/1999/xlink";
     35 
     36   BBOX.MGLYPH = BBOX.Subclass({
     37     type: "image", removeable: false,
     38     Init: function (img,w,h,align,mu,def) {
     39       if (def == null) {def = {}}
     40       var W = img.width*1000/SVG.em, H = img.height*1000/SVG.em;
     41       var WW = W, HH = H, y = 0;
     42       if (w !== "") {W = SVG.length2em(w,mu,WW); H = (WW ? W/WW * HH : 0)}
     43       if (h !== "") {H = SVG.length2em(h,mu,HH); if (w === "") {W = (HH ? H/HH * WW : 0)}}
     44       if (align !== "" && align.match(/\d/)) {y = SVG.length2em(align,mu); def.y = -y}
     45       def.height = Math.floor(H); def.width = Math.floor(W);
     46       def.transform = "translate(0,"+H+") matrix(1 0 0 -1 0 0)";
     47       def.preserveAspectRatio = "none";
     48       this.SUPER(arguments).Init.call(this,def);
     49       this.element.setAttributeNS(XLINKNS,"href",img.src);
     50       this.w = this.r = W; this.h = this.H = H + y;
     51       this.d = this.D = -y; this.l = 0;
     52     }
     53   });
     54   
     55   MML.mglyph.Augment({
     56     toSVG: function (variant,scale) {
     57       this.SVGgetStyles(); var svg = this.SVG(), img, err;
     58       this.SVGhandleSpace(svg);
     59       var values = this.getValues("src","width","height","valign","alt");
     60       if (values.src === "") {
     61         values = this.getValues("index","fontfamily");
     62         if (values.index) {
     63           if (!scale) {scale = this.SVGgetScale()}
     64           var def = {}; if (values.fontfamily) {def["font-family"] = values.fontfamily}
     65           svg.Add(BBOX.TEXT(scale,String.fromCharCode(values.index),def));
     66         }
     67       } else {
     68         if (!this.img) {this.img = MML.mglyph.GLYPH[values.src]}
     69         if (!this.img) {
     70           this.img = MML.mglyph.GLYPH[values.src] = {img: new Image(), status: "pending"};
     71           img = this.img.img;
     72           img.onload  = MathJax.Callback(["SVGimgLoaded",this]);
     73           img.onerror = MathJax.Callback(["SVGimgError",this]);
     74           img.src = values.src;
     75           MathJax.Hub.RestartAfter(img.onload);
     76         }
     77         if (this.img.status !== "OK") {
     78           err = MML.Error(
     79             LOCALE._(["MathML","BadMglyph"],"Bad mglyph: %1",values.src),
     80             {mathsize:"75%"});
     81           this.Append(err); svg = err.toSVG(); this.data.pop();
     82         } else {
     83           var mu = this.SVGgetMu(svg);
     84           svg.Add(BBOX.MGLYPH(this.img.img,values.width,values.height,values.valign,mu,
     85                               {src:values.src, alt:values.alt, title:values.alt}));
     86         }
     87       }
     88       svg.Clean();
     89       this.SVGhandleColor(svg);
     90       this.SVGsaveData(svg);
     91       return svg;
     92     },
     93     SVGimgLoaded: function (event,status) {
     94       if (typeof(event) === "string") {status = event}
     95       this.img.status = (status || "OK")
     96     },
     97     SVGimgError: function () {this.img.img.onload("error")}
     98   },{
     99     GLYPH: {}    // global list of all loaded glyphs
    100   });
    101   
    102   MathJax.Hub.Startup.signal.Post("SVG mglyph Ready");
    103   MathJax.Ajax.loadComplete(SVG.autoloadDir+"/mglyph.js");
    104   
    105 });
    106