+++ /dev/null
-/*
- * extensions/leaders.js
- *
- * Part of the jsMath package for mathematics on the web.
- *
- * This file implements the \overbrace, \underbrace, \overrightarrow
- * and \overleftarrow macros. It will be loaded automatically when needed,
- * or can be loaded by
- *
- * jsMath.Extension.Require('leaders');
- *
- * ---------------------------------------------------------------------
- *
- * Copyright 2005-2006 by Davide P. Cervone
- *
- * 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.
- */
-
-/********************************************************************/
-
-jsMath.Add(jsMath.Box,{
-
- /*
- * Create a horizontally stretchable "delimiter" (like over- and
- * underbraces).
- */
-//### Add size?
- Leaders: function (W,leader) {
- var h; var d; var w; var html; var font;
- if (leader.lmid) {// braces
- font = jsMath.TeX.fam[leader.left[0]];
- var left = this.GetCharCode(leader.left);
- var right = this.GetCharCode(leader.right);
- var lmid = this.GetCharCode(leader.lmid);
- var rmid = this.GetCharCode(leader.rmid);
- w = (W - left.w - right.w - lmid.w - rmid.w)/2 - .1; h = .4; d = .3;
- if (w < 0) {w = 0}
- html = this.AddClass(left.tclass,left.c,left.font)
- + jsMath.HTML.Rule(w,left.h)
- + this.AddClass(lmid.tclass,lmid.c+rmid.c,lmid.font)
- + jsMath.HTML.Rule(w,right.h)
- + this.AddClass(right.tclass,right.c,right.font);
- } else { //arrows
- font = jsMath.TeX.fam[leader.rep[0]];
- var left = this.GetCharCode(leader.left? leader.left: leader.rep);
- var rep = this.GetCharCode(leader.rep);
- var right = this.GetCharCode(leader.right? leader.right: leader.rep);
- var n = Math.ceil((W - left.w - right.w + .4)/(rep.w - .3));
- w = (W - left.w - right.w + .4 - n*(rep.w - .3));
- if (leader.left) {h = left.h; d = left.d} else {h = right.h; d = right.d}
- if (d == null) {d = 0}; if (h == null) {h = 0}
- var html = this.AddClass(left.tclass,left.c,left.font); var m = Math.floor(n/2);
- var ext = jsMath.HTML.Place(rep.c,-.3,0);
- var ehtml = ''; for (var i = 0; i < m; i++) {ehtml += ext};
- html += this.AddClass(rep.tclass,ehtml,rep.font) + jsMath.HTML.Spacer(w);
- ehtml = ''; for (var i = m; i < n; i++) {ehtml += ext};
- html += this.AddClass(rep.tclass,ehtml,rep.font);
- if (jsMath.Browser.msieFontBug) {html += '<span style="display: none">x</span>'}
- html += jsMath.HTML.Place(this.AddClass(right.tclass,right.c,right.font),-.4,0);
- }
- w = jsMath.EmBoxFor(html).w;
- if (w != W) {
- w = jsMath.HTML.Spacer((W-w)/2);
- html = w + html + w;
- }
- var box = new jsMath.Box('html',html,W,h,d);
- box.bh = jsMath.TeX[font].h; box.bd = jsMath.TeX[font].d;
- return box;
- }
-
-});
-
-jsMath.Package(jsMath.Parser,{
-
- macros: {
- overbrace: ['HandleLeaders','downbrace',1],
- underbrace: ['HandleLeaders','upbrace',1,1,-.05],
- overrightarrow: ['HandleLeaders','rightarrow'],
- underrightarrow: ['HandleLeaders','rightarrow',null,1,-.2],
- overleftarrow: ['HandleLeaders','leftarrow'],
- underleftarrow: ['HandleLeaders','leftarrow',null,1,-.2],
- overleftrightarrow: ['HandleLeaders','leftrightarrow'],
- underleftrightarrow: ['HandleLeaders','leftrightarrow',null,1,-.2]
- },
-
- /*
- * The horizontally stretchable delimiters
- */
- leaders: {
- downbrace: {left: [3,0x7A], lmid: [3,0x7D], rmid: [3,0x7C], right: [3,0x7B]},
- upbrace: {left: [3,0x7C], lmid: [3,0x7B], rmid: [3,0x7A], right: [3,0x7D]},
- leftarrow: {left: [2,0x20], rep: [2,0x00]},
- rightarrow: {rep: [2,0x00], right: [2,0x21]},
- leftrightarrow: {left: [2,0x20], rep: [2, 0x00], right: [2,0x21]}
- },
-
- /*
- * Implements \overbrace, \underbrace, etc.
- */
- HandleLeaders: function (name,data) {
- var box = this.ProcessArg(this.cmd+name); if (this.error) return;
- box = jsMath.Box.Set(box,'D',this.mlist.data.size).Remeasured();
- var leader = jsMath.Box.Leaders(box.w,this.leaders[data[0]]);
- if (data[2]) {leader.y = -leader.h-box.d+(data[3]||0)}
- else {leader.y = box.h + Math.max(0,leader.d)+(data[3]||0)}
- box.x = -(leader.w + box.w)/2;
- var space = jsMath.Box.Space((leader.w-box.w)/2);
- box = jsMath.mItem.Atom(data[1]? 'op': 'ord',
- jsMath.Box.SetList([leader,box,space],'T',this.mlist.data.size));
- box.limits = (data[1]? 1: 0);
- this.mlist.Add(box);
- }
-
-});