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/* SpaceAtom.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;
/**
* An atom representing whitespace. The dimension values can be set using different
* unit types.
*/
class SpaceAtom extends Atom {
private static interface UnitConversion { // NOPMD
public float getPixelConversion(TeXEnvironment env);
}
// TODO: UNIT_EM and UNIT_EX yield the same converters ??
private static UnitConversion[] unitConversions = new UnitConversion[] {
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
return env.getTeXFont().getXHeight(env.getStyle(), env.getLastFontId());
}
},
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
return env.getTeXFont().getXHeight(env.getStyle(), env.getLastFontId());
}
},
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
return 1 / env.getSize();
}
},
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
return TeXFont.PIXELS_PER_POINT / env.getSize();
}
},
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
return (12 * TeXFont.PIXELS_PER_POINT) / env.getSize();
}
},
new UnitConversion() {
public float getPixelConversion(TeXEnvironment env) {
TeXFont tf = env.getTeXFont();
return tf.getQuad(env.getStyle(), tf.getMuFontId()) / 18;
}
}
};
// whether a hard space should be represented
private boolean blankSpace = false;
// dimensions
private float width;
private float height;
private float depth;
// units for the dimensions
private int wUnit;
private int hUnit;
private int dUnit;
public SpaceAtom() {
blankSpace = true;
}
public SpaceAtom(int unit, float width, float height, float depth)
throws InvalidUnitException {
// check if unit is valid
checkUnit(unit);
// unit valid
this.wUnit = unit;
this.hUnit = unit;
this.dUnit = unit;
this.width = width;
this.height = height;
this.depth = depth;
}
/**
* Check if the given unit is valid
*
* @param unit the unit's integer representation (a constant)
* @throws InvalidUnitException if the given integer value does not represent
* a valid unit
*/
public static void checkUnit(int unit) throws InvalidUnitException {
if (unit < 0 || unit >= unitConversions.length)
throw new InvalidUnitException();
}
public SpaceAtom(int widthUnit, float width, int heightUnit, float height,
int depthUnit, float depth) throws InvalidUnitException {
// check if units are valid
checkUnit(widthUnit);
checkUnit(heightUnit);
checkUnit(depthUnit);
// all units valid
wUnit = widthUnit;
hUnit = heightUnit;
dUnit = depthUnit;
this.width = width;
this.height = height;
this.depth = depth;
}
public Box createBox(TeXEnvironment env) {
if (blankSpace)
return new StrutBox(env.getSpace(), 0, 0, 0);
else
return new StrutBox(width * getFactor(wUnit, env), height
* getFactor(hUnit, env), depth * getFactor(dUnit, env), 0);
}
private float getFactor(int unit, TeXEnvironment env) {
return unitConversions[unit].getPixelConversion(env);
}
}
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