4 * Part of the jsMath package for mathematics on the web.
6 * This file implements the \bbox macro, which creates an HTML box that
7 * can be styled (for background colors, and so on). You can include
8 * an optional dimension that tells how much extra padding to include
9 * around the bounding box for the mathematics. E.g.,
11 * \bbox[2pt]{x+y} % an invisible box around x+y with 2pt of extra space
12 * \bbox[green]{x+y} % a green box around x+y
13 * \bbox[green,2pt]{x+y} % a green box with 2pt of extra space
14 * \bbox[yellow,2pt,border:1px solid red]{x+y}
15 * % a yellow box with a red border and 2pt space
17 * This extension is loaded automatically when needed, or you can call
20 * jsMath.Extension.Require('bbox');
22 * ---------------------------------------------------------------------
24 * Copyright 2006 by Davide P. Cervone
26 * Licensed under the Apache License, Version 2.0 (the "License");
27 * you may not use this file except in compliance with the License.
28 * You may obtain a copy of the License at
30 * http://www.apache.org/licenses/LICENSE-2.0
32 * Unless required by applicable law or agreed to in writing, software
33 * distributed under the License is distributed on an "AS IS" BASIS,
34 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
35 * See the License for the specific language governing permissions and
36 * limitations under the License.
39 /********************************************************************/
41 jsMath.Add(jsMath.HTML,{
44 * Create a colored bbounding box
46 BBox: function (w,h,d,c,s) {
47 if (w <= 0) {return ''}
48 if (d == null) {d = 0}
49 var style = (jsMath.Browser.msieInlineBlockFix ? '' : 'overflow:visible;');
50 style += 'width:'+this.Em(w)+'; height:'+this.Em(h+d)+';';
51 if (jsMath.Browser.mozInlineBlockBug) {d = -h}
52 if (jsMath.Browser.msieInlineBlockFix) {d -= jsMath.d}
53 if (d) {style += ' vertical-align:'+this.Em(-d)+';'}
54 if (c) {style += ' background-color:'+c+';'}
55 var html = '<span class="blank" style="'+style+s+'"></span>';
61 jsMath.Add(jsMath.mList.prototype.Atomize,{
63 * Creates the box HTML
65 bbox: function (style,size,mitem,prev,mlist) {
66 var box; var w; var h; var d;
67 var nuc = mitem.nuc = jsMath.Box.Set(mitem.nuc,style,size).Remeasured();
68 if (box == null) {w = nuc.w; h = nuc.h; d = nuc.d} // values before super/subs-cript
69 var nuc = mitem.nuc; nuc.Styled(); var pad = mitem.pad;
70 if (pad) {w += 2*pad; h += pad; d += pad; nuc.w += pad}
71 if (jsMath.Browser.msieCenterBugFix)
72 {nuc.html = '<span style="position:relative">'+nuc.html+'</span>'}
74 jsMath.HTML.BBox(w,h,d,mitem.color,mitem.style) +
75 jsMath.HTML.Spacer(pad-w) +
78 if (pad && nuc.w < w) {
79 nuc.html += jsMath.HTML.Spacer(w-nuc.w);
82 nuc.h = Math.max(nuc.h,h); nuc.d = Math.max(nuc.d,d);
83 nuc.bh = Math.max(nuc.bh,nuc.h); nuc.bd = Math.max(nuc.bd,nuc.d);
85 jsMath.mList.prototype.Atomize.SupSub(style,size,mitem);
89 jsMath.Package(jsMath.Parser,{
91 macros: {bbox: 'BBox'},
94 * Implement \bbox[...]{...}
96 BBox: function (name) {
97 var extra = this.GetBrackets(this.cmd+name); if (this.error) return;
98 var arg = this.GetArgument(this.cmd+name); if (this.error) return;
99 var nuc = this.Process(arg); if (this.error) return;
100 var color; var pad = 0; var style = '';
102 var parts = extra.split(/,/);
103 for (var i in parts) {
104 if (parts[i].match(/^\s*([-+]?(\.\d+|\d+(\.\d*)?))(pt|em|ex|mu|px)\s*$/))
105 {pad = this.ParseDimen(parts[i],'',0,1)}
106 else if (parts[i].match(/:/)) {style = parts[i]}
107 else {color = parts[i]}
110 var atom = {nuc: nuc, atom: 1, pad: pad, color: color, style: style};
111 this.mlist.Add(new jsMath.mItem('bbox',atom));