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File:  [LON-CAPA] / loncom / html / adm / jsMath / extensions / bbox.js
Revision 1.2: download - view: text, annotated - select for diffs
Tue Oct 9 21:29:22 2007 UTC (16 years, 11 months ago) by albertel
Branches: MAIN
CVS tags: version_2_9_X, version_2_9_99_0, version_2_9_1, version_2_9_0, version_2_8_X, version_2_8_99_1, version_2_8_99_0, version_2_8_2, version_2_8_1, version_2_8_0, version_2_7_X, version_2_7_99_1, version_2_7_99_0, version_2_7_1, version_2_7_0, version_2_6_X, version_2_6_99_1, version_2_6_99_0, version_2_6_3, version_2_6_2, version_2_6_1, version_2_6_0, version_2_5_99_1, version_2_5_99_0, version_2_12_X, version_2_11_X, version_2_11_5_msu, version_2_11_5, version_2_11_4_uiuc, version_2_11_4_msu, version_2_11_4, version_2_11_3_uiuc, version_2_11_3_msu, version_2_11_3, version_2_11_2_uiuc, version_2_11_2_msu, version_2_11_2_educog, version_2_11_2, version_2_11_1, version_2_11_0_RC3, version_2_11_0_RC2, version_2_11_0_RC1, version_2_11_0, version_2_10_X, version_2_10_1, version_2_10_0_RC2, version_2_10_0_RC1, version_2_10_0, loncapaMITrelate_1, language_hyphenation_merge, language_hyphenation, bz6209-base, bz6209, bz5969, bz2851, PRINT_INCOMPLETE_base, PRINT_INCOMPLETE, HEAD, GCI_3, GCI_2, GCI_1, BZ5971-printing-apage, BZ5434-fox, BZ4492-merge, BZ4492-feature_horizontal_radioresponse
- jsMath 3.4e

    1: /*
    2:  *  extensions/bbox.js
    3:  *  
    4:  *  Part of the jsMath package for mathematics on the web.
    5:  *
    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.,
   10:  *  
   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
   16:  *  
   17:  *  This extension is loaded automatically when needed, or you can call
   18:  *  it directly via
   19:  *  
   20:  *    jsMath.Extension.Require('bbox');
   21:  *  
   22:  *  ---------------------------------------------------------------------
   23:  *
   24:  *  Copyright 2006 by Davide P. Cervone
   25:  * 
   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
   29:  * 
   30:  *      http://www.apache.org/licenses/LICENSE-2.0
   31:  * 
   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.
   37:  */
   38: 
   39: /********************************************************************/
   40: 
   41: jsMath.Add(jsMath.HTML,{
   42: 
   43:   /*
   44:    *  Create a colored bbounding box
   45:    */
   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>';
   56:     return html;
   57:   }
   58: 
   59: });
   60: 
   61: jsMath.Package(jsMath.Parser,{
   62:   
   63:   macros: {bbox: 'BBox'},
   64:   
   65:   /*
   66:    *  Implement \bbox[...]{...}
   67:    */
   68:   BBox: function (name) {
   69:     var extra = this.GetBrackets(this.cmd+name); if (this.error) return;
   70:     var arg = this.ProcessArg(this.cmd+name); if (this.error) return;
   71:     var color; var pad = 0; var style = '';
   72:     if (extra != '') {
   73:       var parts = extra.split(/,/);
   74:       for (var i in parts) {
   75:         if (parts[i].match(/^\s*([-+]?(\.\d+|\d+(\.\d*)?))(pt|em|ex|mu|px)\s*$/))
   76:           {pad = this.ParseDimen(parts[i],'',0,1)}
   77:         else if (parts[i].match(/:/)) {style = parts[i]}
   78:         else {color = parts[i]}
   79:       }
   80:     }
   81:     var box = jsMath.Box.Set(arg,this.mlist.data.style,this.mlist.data.size,1).Remeasured();
   82:     var frame = jsMath.HTML.BBox(box.w+2*pad,box.h+pad,box.d+pad,color,style);
   83:     if (jsMath.Browser.msieCenterBugFix) 
   84:       {box.html = '<span style="position:relative">'+box.html+'</span>'}
   85:     box.html = frame + jsMath.HTML.Spacer(-box.w-pad) + box.html;
   86:     if (pad) {box.html += jsMath.HTML.Spacer(pad)}
   87:     box.w += 2*pad; box.h += pad; box.d += pad;
   88:     box.bh = Math.max(box.bh,box.h); box.bd = Math.max(box.bd,box.d);
   89:     this.mlist.Add(jsMath.mItem.Atom('ord',box));
   90:   }
   91:   
   92: });
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