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/* TeXIcon.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;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import javax.swing.Icon;
/**
* An {@link javax.swing.Icon} implementation that will paint the TeXFormula
* that created it.
* <p>
* This class cannot be instantiated directly. It can be constructed from a
* TeXFormula using the {@link TeXFormula#createTeXIcon(int,float)} method.
*
* @author Kurt Vermeulen
*/
public class TeXIcon implements Icon {
private Box box;
private final float size;
private Insets insets = new Insets(0, 0, 0, 0);
/**
* Creates a new icon that will paint the given formula box in the given point size.
*
* @param b the formula box to be painted
* @param size the point size
*/
protected TeXIcon(Box b, float size) {
box = b;
this.size = size;
}
/**
* Get the insets of the TeXIcon.
*
* @return the insets
*/
public Insets getInsets() {
return insets;
}
/**
* Set the insets of the TeXIcon.
*
* @param insets the insets
*/
public void setInsets(Insets insets) {
this.insets = insets;
}
/**
* Change the width of the TeXIcon. The new width must be greater than the current
* width, otherwise the icon will remain unchanged. The formula will be aligned to the
* left ({@linkplain TeXConstants#ALIGN_LEFT}), to the right
* ({@linkplain TeXConstants#ALIGN_RIGHT}) or will be centered
* in the middle ({@linkplain TeXConstants#ALIGN_CENTER}).
*
* @param width the new width of the TeXIcon
* @param alignment a horizontal alignment constant: LEFT, RIGHT or CENTER
*/
public void setIconWidth(int width, int alignment) {
float diff = width - getIconWidth();
if (diff > 0)
box = new HorizontalBox(box, box.getWidth() + diff, alignment);
}
/**
* Change the height of the TeXIcon. The new height must be greater than the current
* height, otherwise the icon will remain unchanged. The formula will be aligned on top
* (TeXConstants.TOP), at the bottom (TeXConstants.BOTTOM) or will be centered
* in the middle (TeXConstants.CENTER).
*
* @param height the new height of the TeXIcon
* @param alignment a vertical alignment constant: TOP, BOTTOM or CENTER
*/
public void setIconHeight(int height, int alignment) {
float diff = height - getIconHeight();
if (diff > 0)
box = new VerticalBox(box, diff, alignment);
}
/**
* Get the total height of the TeXIcon. This also includes the insets.
*/
public int getIconHeight() {
return (int) ((box.getHeight() + box.getDepth()) * size + 0.99
+ insets.top + insets.bottom);
}
/**
* Get the total width of the TeXIcon. This also includes the insets.
*/
public int getIconWidth() {
return (int) (box.getWidth() * size + 0.99 + insets.left + insets.right);
}
public float getBaseLine() {
return (float)( (box.getHeight() * size + 0.99 + insets.top) /
((box.getHeight() + box.getDepth()) * size + 0.99 + insets.top + insets.bottom));
}
/**
* Paint the {@link TeXFormula} that created this icon.
*/
public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g;
// copy graphics settings
RenderingHints oldHints = g2.getRenderingHints();
AffineTransform oldAt = g2.getTransform();
Color oldColor = g2.getColor();
// new settings
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.scale(size, size); // the point size
g2.setColor(c.getForeground()); // foreground will be used as default painting color
// draw formula box
box.draw(g2, (x + insets.left) / size, (y + insets.top) / size
+ box.getHeight());
// restore graphics settings
g2.setRenderingHints(oldHints);
g2.setTransform(oldAt);
g2.setColor(oldColor);
}
}
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