/* XArrowAtom.java
* =========================================================================
* This file is part of the JLaTeXMath Library - http://forge.scilab.org/jlatexmath
*
* Copyright (C) 2009 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
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*
*/
package com.himamis.retex.renderer.share;
/**
* An atom representing an extensible left or right arrow to handle xleftarrow and xrightarrow
* commands in LaTeX.
*/
public class XArrowAtom extends Atom {
private Atom over, under;
private boolean left;
@Override
final public Atom duplicate() {
return setFields(new XArrowAtom(over, under, left));
}
public XArrowAtom(Atom over, Atom under, boolean left) {
this.over = over;
this.under = under;
this.left = left;
}
@Override
public Box createBox(TeXEnvironment env) {
Box O = over != null ? over.createBox(env.supStyle()) : new StrutBox(0, 0, 0, 0);
Box U = under != null ? under.createBox(env.subStyle()) : new StrutBox(0, 0, 0, 0);
Box oside = new SpaceAtom(TeXConstants.UNIT_EM, 1.5f, 0, 0).createBox(env.supStyle());
Box uside = new SpaceAtom(TeXConstants.UNIT_EM, 1.5f, 0, 0).createBox(env.subStyle());
Box sep = new SpaceAtom(TeXConstants.UNIT_MU, 0, 2f, 0).createBox(env);
double width = Math.max(O.getWidth() + 2 * oside.getWidth(), U.getWidth() + 2 * uside.getWidth());
Box arrow = XLeftRightArrowFactory.create(left, env, width);
Box ohb = new HorizontalBox(O, width, TeXConstants.ALIGN_CENTER);
Box uhb = new HorizontalBox(U, width, TeXConstants.ALIGN_CENTER);
VerticalBox vb = new VerticalBox();
vb.add(ohb);
vb.add(sep);
vb.add(arrow);
vb.add(sep);
vb.add(uhb);
double h = vb.getHeight() + vb.getDepth();
double d = sep.getHeight() + sep.getDepth() + uhb.getHeight() + uhb.getDepth();
vb.setDepth(d);
vb.setHeight(h - d);
HorizontalBox hb = new HorizontalBox(vb, vb.getWidth() + 2 * sep.getHeight(),
TeXConstants.ALIGN_CENTER);
return hb;
}
}