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/* AccentedAtom.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 accent symbol above it.
*/
class AccentedAtom extends Atom {
// accent symbol
private final SymbolAtom accent;
// base atom
protected Atom base = null;
/**
* Creates an AccentedAtom from a base atom and an accent symbol defined by its name
*
* @param base base atom
* @param accentName name of the accent symbol to be put over the base atom
* @throws InvalidSymbolTypeException if the symbol is not defined as an accent ('acc')
* @throws SymbolNotFoundException if there's no symbol defined with the given name
*/
public AccentedAtom(Atom base, String accentName)
throws InvalidSymbolTypeException, SymbolNotFoundException {
accent = SymbolAtom.get(accentName);
if (accent.type == TeXConstants.TYPE_ACCENT)
this.base = base;
else
throw new InvalidSymbolTypeException("The symbol with the name '"
+ accentName + "' is not defined as an accent ("
+ TeXSymbolParser.TYPE_ATTR + "='acc') in '"
+ TeXSymbolParser.RESOURCE_NAME + "'!");
}
/**
* Creates an AccentedAtom from a base atom and an accent symbol defined as a TeXFormula.
* This is used for parsing MathML.
*
* @param base base atom
* @param acc TeXFormula representing an accent (SymbolAtom)
* @throws InvalidTeXFormulaException if the given TeXFormula does not represent a
* single SymbolAtom (type "TeXConstants.TYPE_ACCENT")
* @throws InvalidSymbolTypeException if the symbol is not defined as an accent ('acc')
*/
public AccentedAtom(Atom base, TeXFormula acc)
throws InvalidTeXFormulaException, InvalidSymbolTypeException {
if (acc == null)
throw new InvalidTeXFormulaException(
"The accent TeXFormula can't be null!");
else {
Atom root = acc.root;
if (root instanceof SymbolAtom) {
accent = (SymbolAtom) root;
if (accent.type == TeXConstants.TYPE_ACCENT)
this.base = base;
else
throw new InvalidSymbolTypeException(
"The accent TeXFormula represents a single symbol with the name '"
+ accent.getName()
+ "', but this symbol is not defined as an accent ("
+ TeXSymbolParser.TYPE_ATTR + "='acc') in '"
+ TeXSymbolParser.RESOURCE_NAME + "'!");
} else
throw new InvalidTeXFormulaException(
"The accent TeXFormula does not represent a single symbol!");
}
}
public Box createBox(TeXEnvironment env) {
TeXFont tf = env.getTeXFont();
int style = env.getStyle();
// set base in cramped style
Box b = (base == null ? new StrutBox(0, 0, 0, 0) : base.createBox(env
.crampStyle()));
float u = b.getWidth();
float s = 0;
if (base instanceof CharSymbol)
s = tf.getSkew(((CharSymbol) base).getCharFont(tf), style);
// retrieve best Char from the accent symbol
Char ch = tf.getChar(accent.getName(), style);
while (tf.hasNextLarger(ch)) {
Char larger = tf.getNextLarger(ch, style);
if (larger.getWidth() <= u)
ch = larger;
else
break;
}
// calculate delta
float delta = Math.min(b.getHeight(), tf.getXHeight(style, ch
.getFontCode()));
// create vertical box
VerticalBox vBox = new VerticalBox();
// accent
Box y;
float italic = ch.getItalic();
if (italic > TeXFormula.PREC) {
y = new HorizontalBox(new CharBox(ch));
y.add(new StrutBox(italic, 0, 0, 0));
} else
y = new CharBox(ch);
// if diff > 0, center accent, otherwise center base
float diff = (u - y.getWidth()) / 2;
y.setShift(s + (diff > 0 ? diff : 0));
if (diff < 0)
b = new HorizontalBox(b, y.getWidth(), TeXConstants.ALIGN_CENTER);
vBox.add(y);
// kern
vBox.add(new StrutBox(0, -delta, 0, 0));
// base
vBox.add(b);
// set height and depth vertical box
float total = vBox.getHeight() + vBox.getDepth(), d = b.getDepth();
vBox.setDepth(d);
vBox.setHeight(total - d);
return vBox;
}
}
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