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/* Glue.java
* =========================================================================
* This file is part of the JMathTeX Library - http://jmathtex.sourceforge.net
*
* Copyright (C) 2004-2007 Universiteit Gent
*
* 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 be.ugent.caagt.jmathtex;
/**
* Represents glue by its 3 components. Contains the "glue rules".
*/
class Glue {
// the glue components
private final float space;
private final float stretch;
private final float shrink;
private final String name;
// contains the different glue types
private static Glue[] glueTypes;
// the glue table representing the "glue rules" (as in TeX)
private static final int[][][] glueTable;
static {
GlueSettingsParser parser = new GlueSettingsParser();
glueTypes = parser.getGlueTypes();
glueTable = parser.createGlueTable();
}
public Glue(float space, float stretch, float shrink, String name) {
this.space = space;
this.stretch = stretch;
this.shrink = shrink;
this.name = name;
}
/**
* Name of this glue object.
*/
public String getName () {
return this.name;
}
/**
* Creates a box representing the glue type according to the "glue rules" based
* on the atom types between which the glue must be inserted.
*
* @param lType left atom type
* @param rType right atom type
* @param env the TeXEnvironment
* @return a box containing representing the glue
*/
public static Box get(int lType, int rType, TeXEnvironment env) {
// types > INNER are considered of type ORD for glue calculations
int l = (lType > 7 ? TeXConstants.TYPE_ORDINARY : lType);
int r = (rType > 7 ? TeXConstants.TYPE_ORDINARY : rType);
// search right glue-type in "glue-table"
int glueType = glueTable[l][r][env.getStyle() / 2];
return glueTypes[glueType].createBox(env);
}
private Box createBox(TeXEnvironment env) {
TeXFont tf = env.getTeXFont();
// use "quad" from a font marked as an "mu font"
float quad = tf.getQuad(env.getStyle(), tf.getMuFontId());
return new GlueBox((space / 18.0f) * quad, (stretch / 18.0f) * quad,
(shrink / 18.0f) * quad);
}
}
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