ResizeAtom.java

/* ResizeAtom.java
 * =========================================================================
 * This file is part of the JLaTeXMath Library - http://forge.scilab.org/jlatexmath
 *
 * Copyright (C) 2011 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 scaled Atom.
 */
public class ResizeAtom extends Atom {

    private Atom base;
    private int wunit, hunit;
    private float w, h;
    private boolean keepaspectratio;

    public ResizeAtom(Atom base, String ws, String hs, boolean keepaspectratio) {
        this.type = base.type;
        this.base = base;
        this.keepaspectratio = keepaspectratio;
        float[] w = SpaceAtom.getLength(ws == null ? "" : ws);
        float[] h = SpaceAtom.getLength(hs == null ? "" : hs);
        if (w.length != 2) {
            this.wunit = -1;
        } else {
            this.wunit = (int) w[0];
            this.w = w[1];
        }
        if (h.length != 2) {
            this.hunit = -1;
        } else {
            this.hunit = (int) h[0];
            this.h = h[1];
        }
    }

    public int getLeftType() {
        return base.getLeftType();
    }

    public int getRightType() {
        return base.getRightType();
    }

    public Box createBox(TeXEnvironment env) {
        Box bbox = base.createBox(env);
        if (wunit == -1 && hunit == -1) {
            return bbox;
        } else {
            double xscl = 1;
            double yscl = 1;
            if (wunit != -1 && hunit != -1) {
                xscl = w * SpaceAtom.getFactor(wunit, env) / bbox.width;
                yscl = h * SpaceAtom.getFactor(hunit, env) / bbox.height;
                if (keepaspectratio) {
                    xscl = Math.min(xscl, yscl);
                    yscl = xscl;
                }
            } else if (wunit != -1 && hunit == -1) {
                xscl = w * SpaceAtom.getFactor(wunit, env) / bbox.width;
                yscl = xscl;
            } else {
                yscl = h * SpaceAtom.getFactor(hunit, env) / bbox.height;
                xscl = yscl;
            }

            return new ScaleBox(bbox, xscl, yscl);
        }
    }
}