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A Java API to render LaTeX
There is a newer version: 1.0.7
/* MultlineAtom.java
 * =========================================================================
 * This file is part of the JLaTeXMath Library - http://forge.scilab.org/jlatexmath
 *
 * Copyright (C) 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.
 *
 * Linking this library statically or dynamically with other modules 
 * is making a combined work based on this library. Thus, the terms 
 * and conditions of the GNU General Public License cover the whole 
 * combination.
 * 
 * As a special exception, the copyright holders of this library give you 
 * permission to link this library with independent modules to produce 
 * an executable, regardless of the license terms of these independent 
 * modules, and to copy and distribute the resulting executable under terms 
 * of your choice, provided that you also meet, for each linked independent 
 * module, the terms and conditions of the license of that module. 
 * An independent module is a module which is not derived from or based 
 * on this library. If you modify this library, you may extend this exception 
 * to your version of the library, but you are not obliged to do so. 
 * If you do not wish to do so, delete this exception statement from your 
 * version.
 * 
 */

package org.scilab.forge.jlatexmath;

/**
 * An atom representing a vertical row of other atoms.
 */
public class MultlineAtom extends Atom {
    
    public static SpaceAtom vsep_in = new SpaceAtom(TeXConstants.UNIT_EX, 0.0f, 1.0f, 0.0f);
    public static final int MULTLINE = 0;
    public static final int GATHER = 1;
    public static final int GATHERED = 2;
    
    private ArrayOfAtoms column;
    private int type;
    private boolean isPartial;

    public MultlineAtom(boolean isPartial, ArrayOfAtoms column, int type) {
        this.isPartial = isPartial;
	this.column = column;
	this.type = type;
    }

    public MultlineAtom(ArrayOfAtoms column, int type) {
        this(false, column, type);
    }
    
    public Box createBox(TeXEnvironment env) {
	float tw = env.getTextwidth();
	if (tw == Float.POSITIVE_INFINITY || type == GATHERED) {
	    return new MatrixAtom(isPartial, column, "").createBox(env);
	}

	VerticalBox vb = new VerticalBox();
	Atom at = column.array.get(0).get(0);
	int alignment = type == GATHER ? TeXConstants.ALIGN_CENTER : TeXConstants.ALIGN_LEFT;
	if (at.alignment != -1) {
	    alignment = at.alignment;
	}
	vb.add(new HorizontalBox(at.createBox(env), tw, alignment));
	Box Vsep = vsep_in.createBox(env);
	for (int i = 1; i < column.row - 1; i++) {
	    at = column.array.get(i).get(0);
	    alignment = TeXConstants.ALIGN_CENTER;
	    if (at.alignment != -1) {
		alignment = at.alignment;
	    }
	    vb.add(Vsep);
	    vb.add(new HorizontalBox(at.createBox(env), tw, alignment));
	}
	
	if (column.row > 1) {
	    at = column.array.get(column.row - 1).get(0);
	    alignment = type == GATHER ? TeXConstants.ALIGN_CENTER : TeXConstants.ALIGN_RIGHT;
	    if (at.alignment != -1) {
		alignment = at.alignment;
	    }
	    vb.add(Vsep);
	    vb.add(new HorizontalBox(at.createBox(env), tw, alignment));
	}
	
	float height = vb.getHeight() + vb.getDepth();
	vb.setHeight(height / 2);
	vb.setDepth(height / 2);

	return vb;
    }
}