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A Java API to render LaTeX
There is a newer version: 1.0.7
/* OverUnderDelimiter.java
 * =========================================================================
 * This file is originally part of the JMathTeX Library - http://jmathtex.sourceforge.net
 * 
 * Copyright (C) 2004-2007 Universiteit Gent
 * Copyright (C) 2009-2010 DENIZET Calixte
 * 
 * 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 org.scilab.forge.jlatexmath;

/**
 * A box representing another atom with a delimiter and a script above or under it, 
 * with script and delimiter seperated by a kern.
 */
public class OverUnderDelimiter extends Atom {

    // base and script atom
    private final Atom base;
    private 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 void addScript(Atom script) {
	this.script = script;
    }

    public boolean isOver() {
	return 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 than maximum width
	float max = getMaxWidth(b, del, scriptBox);
	if (max - b.getWidth() > TeXFormula.PREC) {
	    b = new HorizontalBox(b, max, TeXConstants.ALIGN_CENTER);
	}

	del = new VerticalBox(del, max, TeXConstants.ALIGN_CENTER);
	if (scriptBox != null && 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;
    }
}