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/* UnderOverAtom.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 another atom with an atom above it (if not null) seperated
* by a kern and in a smaller size depending on "overScriptSize" and/or an atom under
* it (if not null) seperated by a kern and in a smaller size depending on "underScriptSize"
*/
class UnderOverAtom extends Atom {
// base, underscript and overscript
private final Atom base;
private final Atom under;
private final Atom over;
// kern between base and under- and overscript
private final float underSpace;
private final float overSpace;
// units for the kerns
private final int underUnit; // NOPMD
// TODO: seems never to be used?
private final int overUnit;
// whether the under- and overscript should be drawn in a smaller size
private final boolean underScriptSize;
private final boolean overScriptSize;
public UnderOverAtom(Atom base, Atom underOver, int underOverUnit,
float underOverSpace, boolean underOverScriptSize, boolean over) {
// check if unit is valid
SpaceAtom.checkUnit(underOverUnit);
// units valid
this.base = base;
// TODO: split into two different classes?
if (over) {
this.under = null;
this.underSpace = 0.0f;
this.underUnit = 0;
this.underScriptSize = false;
this.over = underOver;
this.overUnit = underOverUnit;
this.overSpace = underOverSpace;
this.overScriptSize = underOverScriptSize;
} else {
this.under = underOver;
this.underUnit = underOverUnit;
this.underSpace = underOverSpace;
this.underScriptSize = underOverScriptSize;
this.overSpace = 0.0f;
this.over = null;
this.overUnit = 0;
this.overScriptSize = false;
}
}
public UnderOverAtom(Atom base, Atom under, int underUnit, float underSpace,
boolean underScriptSize, Atom over, int overUnit, float overSpace,
boolean overScriptSize) throws InvalidUnitException {
// check if units are valid
SpaceAtom.checkUnit(underUnit);
SpaceAtom.checkUnit(overUnit);
// units valid
this.base = base;
this.under = under;
this.underUnit = underUnit;
this.underSpace = underSpace;
this.underScriptSize = underScriptSize;
this.over = over;
this.overUnit = overUnit;
this.overSpace = overSpace;
this.overScriptSize = overScriptSize;
}
public Box createBox(TeXEnvironment env) {
// create boxes in right style and calculate maximum width
Box b = (base == null ? new StrutBox(0, 0, 0, 0) : base.createBox(env));
Box o = null, u = null;
float max = b.getWidth();
if (over != null) {
o = over.createBox(overScriptSize ? env.subStyle() : env);
max = Math.max(max, o.getWidth());
}
if (under != null) {
u = under.createBox(underScriptSize ? env.subStyle() : env);
max = Math.max(max, u.getWidth());
}
// create vertical box
VerticalBox vBox = new VerticalBox();
// last font used by the base (for Mspace atoms following)
env.setLastFontId(b.getLastFontId());
// overscript + space
if (over != null) {
vBox.add(changeWidth(o, max));
// unit will be valid (checked in constructor)
vBox.add(new SpaceAtom(overUnit, 0, overSpace, 0).createBox(env));
}
// base
vBox.add(changeWidth(b, max));
// calculate future height of the vertical box (to make sure that the base
// stays on the baseline!)
float h = vBox.getHeight() + vBox.getDepth() - b.getDepth();
// underscript + space
if (under != null) {
// unit will be valid (checked in constructor)
vBox.add(new SpaceAtom(overUnit, 0, underSpace, 0).createBox(env));
vBox.add(changeWidth(u, max));
}
// set height and depth
vBox.setDepth(vBox.getHeight() + vBox.getDepth() - h);
vBox.setHeight(h);
return vBox;
}
private static Box changeWidth(Box b, float maxWidth) {
if (b != null && Math.abs(maxWidth - b.getWidth()) > TeXFormula.PREC)
return new HorizontalBox(b, maxWidth, TeXConstants.ALIGN_CENTER);
else
return b;
}
}
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