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/* OverUnderDelimiter.java
* =========================================================================
* This file is part of the JMathTeX Library - http://jmathtex.sourceforge.net
*
* Copyright (C) 2004-2007 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
package be.ugent.caagt.jmathtex;
/**
* A box representing another atom with a delimiter and a script above or under it,
* with script and delimiter seperated by a kern.
*/
class OverUnderDelimiter extends Atom {
// base and script atom
private final Atom base;
private final Atom script;
// delimiter symbol
private final SymbolAtom symbol;
// kern between delimiter and script
private final SpaceAtom kern;
// whether the delimiter should be positioned above or under the base
private final boolean over;
public OverUnderDelimiter(Atom base, Atom script, SymbolAtom s, int kernUnit,
float kern, boolean over) throws InvalidUnitException {
type = TeXConstants.TYPE_INNER;
this.base = base;
this.script = script;
symbol = s;
this.kern = new SpaceAtom(kernUnit, 0, kern, 0);
this.over = over;
}
public Box createBox(TeXEnvironment env) {
Box b = (base == null ? new StrutBox(0, 0, 0, 0) : base.createBox(env));
Box del = DelimiterFactory.create(symbol.getName(), env, b.getWidth());
Box scriptBox = null;
if (script != null)
scriptBox = script.createBox((over ? env.supStyle() : env.subStyle()));
// create centered horizontal box if smaller dan maximum width
float max = getMaxWidth(b, del, scriptBox);
if (Math.abs(max - b.getWidth()) > TeXFormula.PREC)
b = new HorizontalBox(b, max, TeXConstants.ALIGN_CENTER);
if (Math.abs(max - del.getHeight() - del.getDepth()) > TeXFormula.PREC)
del = new VerticalBox(del, max, TeXConstants.ALIGN_CENTER);
if (scriptBox != null
&& Math.abs(max - scriptBox.getWidth()) > TeXFormula.PREC)
scriptBox = new HorizontalBox(scriptBox, max,
TeXConstants.ALIGN_CENTER);
return new OverUnderBox(b, del, scriptBox, kern.createBox(env)
.getHeight(), over);
}
private static float getMaxWidth(Box b, Box del, Box script) {
float max = Math.max(b.getWidth(), del.getHeight() + del.getDepth());
if (script != null)
max = Math.max(max, script.getWidth());
return max;
}
}
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