/*
* Open Source Physics software is free software as described near the bottom of this code file.
*
* For additional information and documentation on Open Source Physics please see:
* <http://www.opensourcephysics.org/>
*/
package org.opensourcephysics.display;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
* The TextPanel renders text in a component.
* The text is surrounded by a border.
*
* @author Wolfgang Christian
* @version 1.0
*/
public class TextPanel extends JPanel {
protected static Dimension ZEROSIZE = new Dimension(0, 0);
protected String text = ""; //$NON-NLS-1$
protected Font font;
protected String fontname = "TimesRoman"; // The logical name of the font to use //$NON-NLS-1$
protected int fontsize = 14; // The font size
protected int fontstyle = Font.PLAIN; // The font style
protected Color textColor = Color.black; // text color
protected Color backgroundColor = Color.yellow; // background color
protected Dimension dim = ZEROSIZE;
/**
* Constructs a TextPanel and places it within the given drawing panel.
*/
public TextPanel() {
setBackground(backgroundColor);
font = new Font(fontname, fontstyle, fontsize);
}
/**
* Constructs a TextPanel and places it within the given drawing panel.
*
* @param text the text to be displayed
*/
public TextPanel(String text) {
this();
setText(text);
}
/**
* Sets the text.
*
* The position is ignored if the location is set to a corner.
*
* @param _text
*/
public void setText(String _text) {
_text = TeXParser.parseTeX(_text);
if(text==_text) {
return;
}
text = _text;
if(text==null) {
text = ""; //$NON-NLS-1$
}
final Container c = this.getParent();
if(c==null) {
return;
}
Runnable runner = new Runnable() {
public synchronized void run() {
if(c.getLayout() instanceof OSPLayout) {
((OSPLayout) c.getLayout()).quickLayout(c, TextPanel.this);
repaint();
} else {
c.validate();
}
}
};
if(SwingUtilities.isEventDispatchThread()) {
runner.run();
} else {
SwingUtilities.invokeLater(runner);
}
}
/**
* Gets the preferred size of this component.
* @return a dimension object indicating this component's preferred size
* @see #getMinimumSize
* @see LayoutManager
*/
public Dimension getPreferredSize() {
Container c = this.getParent();
String text = this.text; // local reference for thread safety
if((c==null)||text.equals("")) { //$NON-NLS-1$
return ZEROSIZE;
}
Graphics2D g2 = (Graphics2D) c.getGraphics();
if(g2==null) {
return ZEROSIZE;
}
Font oldFont = g2.getFont();
g2.setFont(font);
FontMetrics fm = g2.getFontMetrics();
int boxHeight = fm.getAscent()+4; // current string height
int boxWidth = fm.stringWidth(text)+6; // current string width
g2.setFont(oldFont);
return new Dimension(boxWidth, boxHeight);
}
/**
* Paints this component.
* @param g
*/
public void paintComponent(Graphics g) {
String text = this.text; // local reference for thread safety
if(!dim.equals(getPreferredSize())) {
dim = getPreferredSize();
setSize(dim);
}
if(text.equals("")||!isVisible()) { //$NON-NLS-1$
return;
}
Graphics2D g2 = (Graphics2D) g;
//super.paintComponent(g);
int w = getWidth();
int h = getHeight();
Color oldColor=g2.getColor(); // save current color
Font oldFont = g2.getFont(); // save current font
g2.setColor(backgroundColor);
g2.fillRect(0, 0, w, h);
g2.setColor(textColor);
g2.setFont(font);
g2.drawString(text, 3, h-4);
g2.setColor(Color.black);
g2.drawRect(0, 0, w-1, h-1);
g2.setFont(oldFont); // restore the old font
g2.setColor(oldColor); // restore the old color
}
}
/*
* Open Source Physics software is free software; you can redistribute
* it and/or modify it under the terms of the GNU General Public License (GPL) as
* published by the Free Software Foundation; either version 2 of the License,
* or(at your option) any later version.
* Code that uses any portion of the code in the org.opensourcephysics package
* or any subpackage (subdirectory) of this package must must also be be released
* under the GNU GPL license.
*
* This software 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.
*
* You should have received a copy of the GNU General Public License
* along with this; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA
* or view the license online at http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2007 The Open Source Physics project
* http://www.opensourcephysics.org
*/