www

mmultiscripts.js (5661B)

---

 /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
 /* vim: set ts=2 et sw=2 tw=80: */
 
 /*************************************************************
  *
  *  MathJax/jax/output/SVG/autoload/mmultiscripts.js
  *  
  *  Implements the SVG output for <mmultiscripts> elements.
  *
  *  ---------------------------------------------------------------------
  *  
  *  Copyright (c) 2011-2015 The MathJax Consortium
  * 
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  * 
  *      http://www.apache.org/licenses/LICENSE-2.0
  * 
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
 
 MathJax.Hub.Register.StartupHook("SVG Jax Ready",function () {
   var VERSION = "2.6.0";
   var MML = MathJax.ElementJax.mml,
       SVG = MathJax.OutputJax.SVG;
   
   MML.mmultiscripts.Augment({
     toSVG: function (HW,D) {
       this.SVGgetStyles();
       var svg = this.SVG(), scale = this.SVGgetScale(svg); this.SVGhandleSpace(svg);
       var base = (this.data[this.base] ? this.SVGdataStretched(this.base,HW,D) : SVG.BBOX.G().Clean());
       var x_height = SVG.TeX.x_height * scale,
           s = SVG.TeX.scriptspace * scale * .75;  // FIXME: .75 can be removed when IC is right?
 
       var BOX = this.SVGgetScripts(s);
       var sub = BOX[0], sup = BOX[1], presub = BOX[2], presup = BOX[3];
 
       var sscale = (this.data[1]||this).SVGgetScale();
       var q = SVG.TeX.sup_drop * sscale, r = SVG.TeX.sub_drop * sscale;
       var u = base.h - q, v = base.d + r, delta = 0, p;
       if (base.ic) {delta = base.ic}
       if (this.data[this.base] &&
          (this.data[this.base].type === "mi" || this.data[this.base].type === "mo")) {
         if (this.data[this.base].data.join("").length === 1 && base.scale === 1 &&
             !base.stretched && !this.data[this.base].Get("largeop")) {u = v = 0}
       }
       var min = this.getValues("subscriptshift","superscriptshift"), mu = this.SVGgetMu(svg);
       min.subscriptshift   = (min.subscriptshift === ""   ? 0 : SVG.length2em(min.subscriptshift,mu));
       min.superscriptshift = (min.superscriptshift === "" ? 0 : SVG.length2em(min.superscriptshift,mu));
 
       var dx = 0;
       if (presub) {dx = presub.w+delta} else if (presup) {dx = presup.w-delta}
       svg.Add(base,Math.max(0,dx),0);
 
       if (!sup && !presup) {
         v = Math.max(v,SVG.TeX.sub1*scale,min.subscriptshift);
         if (sub)    {v = Math.max(v,sub.h-(4/5)*x_height)}
         if (presub) {v = Math.max(v,presub.h-(4/5)*x_height)}
         if (sub)    {svg.Add(sub,dx+base.w+s-delta,-v)}
         if (presub) {svg.Add(presub,0,-v)}
       } else {
         if (!sub && !presub) {
           var values = this.getValues("displaystyle","texprimestyle");
           p = SVG.TeX[(values.displaystyle ? "sup1" : (values.texprimestyle ? "sup3" : "sup2"))];
           u = Math.max(u,p*scale,min.superscriptshift);
           if (sup)    {u = Math.max(u,sup.d+(1/4)*x_height)}
           if (presup) {u = Math.max(u,presup.d+(1/4)*x_height)}
           if (sup)    {svg.Add(sup,dx+base.w+s,u)}
           if (presup) {svg.Add(presup,0,u)}
         } else {
           v = Math.max(v,SVG.TeX.sub2*scale);
           var t = SVG.TeX.rule_thickness * scale;
           var h = (sub||presub).h, d = (sup||presup).d;
           if (presub) {h = Math.max(h,presub.h)}
           if (presup) {d = Math.max(d,presup.d)}
           if ((u - d) - (h - v) < 3*t) {
             v = 3*t - u + d + h; q = (4/5)*x_height - (u - d);
             if (q > 0) {u += q; v -= q}
           }
           u = Math.max(u,min.superscriptshift); v = Math.max(v,min.subscriptshift);
           if (sup)    {svg.Add(sup,dx+base.w+s,u)}
           if (presup) {svg.Add(presup,dx+delta-presup.w,u)}
           if (sub)    {svg.Add(sub,dx+base.w+s-delta,-v)}
           if (presub) {svg.Add(presub,dx-presub.w,-v)}
         }
       }
       svg.Clean();
       this.SVGhandleColor(svg);
       this.SVGsaveData(svg);
       var data = this.SVGdata;
       data.dx = dx; data.s = s; data.u = u, data.v = v; data.delta = delta;      
       return svg;
     },
     SVGgetScripts: function (s) {
       var sup, sub, BOX = [];
       var i = 1, m = this.data.length, W = 0;
       for (var k = 0; k < 4; k += 2) {
         while (i < m && (this.data[i]||{}).type !== "mprescripts") {
           var box = [null,null,null,null];
           for (var j = k; j < k+2; j++) {
             if (this.data[i] && this.data[i].type !== "none" && this.data[i].type !== "mprescripts") {
               if (!BOX[j]) {BOX[j] = SVG.BBOX.G()}
               box[j] = this.data[i].toSVG();
             }
             if ((this.data[i]||{}).type !== "mprescripts") i++;
           }
           var isPre = (k === 2);
           if (isPre) W += Math.max((box[k]||{w:0}).w,(box[k+1]||{w:0}).w);
           if (box[k])   BOX[k].Add(box[k].With({x:W-(isPre?box[k].w:0)}));
           if (box[k+1]) BOX[k+1].Add(box[k+1].With({x:W-(isPre?box[k+1].w:0)}));
           sub = BOX[k]||{w:0}; sup = BOX[k+1]||{w:0};
           sub.w = sup.w = W = Math.max(sub.w,sup.w);
         }
         i++; W = 0;
       }
       for (j = 0; j < 4; j++) {if (BOX[j]) {BOX[j].w += s; BOX[j].Clean()}}
       return BOX;
     }
   });
   
   MathJax.Hub.Startup.signal.Post("SVG mmultiscripts Ready");
   MathJax.Ajax.loadComplete(SVG.autoloadDir+"/mmultiscripts.js");
 
 });