/* XLeftRightArrowFactory.java
* =========================================================================
* This file is part of the JLaTeXMath Library - http://jlatexmath.sourceforge.net
*
* 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
* to your version of the library, but you are not obliged to do so.
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*
*/
package com.himamis.retex.renderer.share;
/**
* Responsible for creating a box containing a delimiter symbol that exists in different sizes.
*/
public class XLeftRightArrowFactory {
private static final Atom MINUS = SymbolAtom.get("minus");
private static final Atom LEFT = SymbolAtom.get("leftarrow");
private static final Atom RIGHT = SymbolAtom.get("rightarrow");
public static Box create(boolean left, TeXEnvironment env, double width) {
Box arr = left ? LEFT.createBox(env) : RIGHT.createBox(env);
double h = arr.getHeight();
double d = arr.getDepth();
double swidth = arr.getWidth();
if (width <= swidth) {
arr.setDepth(d / 2);
return arr;
}
Box minus = new SmashedAtom(MINUS, "").createBox(env);
Box kern = new SpaceAtom(TeXConstants.UNIT_MU, -4f, 0, 0).createBox(env);
double mwidth = minus.getWidth() + kern.getWidth();
swidth += kern.getWidth();
HorizontalBox hb = new HorizontalBox();
double w;
for (w = 0; w < width - swidth - mwidth; w += mwidth) {
hb.add(minus);
hb.add(kern);
}
double sf = (width - swidth - w) / minus.getWidth();
hb.add(new SpaceAtom(TeXConstants.UNIT_MU, -2f * sf, 0, 0).createBox(env));
hb.add(new ScaleAtom(MINUS, sf, 1).createBox(env));
if (left) {
hb.add(0, new SpaceAtom(TeXConstants.UNIT_MU, -3.5f, 0, 0).createBox(env));
hb.add(0, arr);
} else {
hb.add(new SpaceAtom(TeXConstants.UNIT_MU, -2f * sf - 2f, 0, 0).createBox(env));
hb.add(arr);
}
hb.setDepth(d / 2);
hb.setHeight(h);
return hb;
}
public static Box create(TeXEnvironment env, double width) {
Box left = LEFT.createBox(env);
Box right = RIGHT.createBox(env);
double swidth = left.getWidth() + right.getWidth();
if (width < swidth) {
HorizontalBox hb = new HorizontalBox(left);
hb.add(new StrutBox(-Math.min(swidth - width, left.getWidth()), 0, 0, 0));
hb.add(right);
return hb;
}
Box minus = new SmashedAtom(MINUS, "").createBox(env);
Box kern = new SpaceAtom(TeXConstants.UNIT_MU, -3.4f, 0, 0).createBox(env);
double mwidth = minus.getWidth() + kern.getWidth();
swidth += 2 * kern.getWidth();
HorizontalBox hb = new HorizontalBox();
double w;
for (w = 0; w < width - swidth - mwidth; w += mwidth) {
hb.add(minus);
hb.add(kern);
}
hb.add(new ScaleBox(minus, (width - swidth - w) / minus.getWidth(), 1));
hb.add(0, kern);
hb.add(0, left);
hb.add(kern);
hb.add(right);
return hb;
}
}