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Simple Java 2D Example, Double Buffering
/**
* Copyright (c) 2006-2010 Berlin Brown and botnode.com All Rights Reserved
*
* http://www.opensource.org/licenses/bsd-license.php
* All rights reserved.
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the Botnode.com (Berlin Brown) nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* BasicDoubleBufferSwing.java
* Jan 10, 2011
* bbrown
* Contact: Berlin Brown <berlin dot brown at gmail.com>
*/
package org.berlin.swing;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;
import java.util.Timer;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* Basic Double Buffer Swing Example .
*
* @author bbrown
*
*/
public class BasicDoubleBufferSwing {
public static class Canvas extends JPanel {
private static final long serialVersionUID = 1L;
private Image offScreenImage = null;
private Graphics offScreenGraphics = null;
private Image offScreenImageDrawed = null;
private Graphics offScreenGraphicsDrawed = null;
private Timer timer = new Timer();
private int counter = 0;
public Canvas() {
timer.schedule(new AutomataTask(), 0, 100);
this.setPreferredSize(new Dimension(800, 600));
this.setBackground(Color.white);
}
/**
* Use double buffering.
* @see java.awt.Component#update(java.awt.Graphics)
*/
@Override
public void update(Graphics g) {
paint(g);
System.out.println("update called ----------->");
}
/**
* Draw this generation.
* @see java.awt.Component#paint(java.awt.Graphics)
*/
@Override
public void paint(final Graphics g) {
final Dimension d = getSize();
if (offScreenImageDrawed == null) {
// Double-buffer: clear the offscreen image.
offScreenImageDrawed = createImage(d.width, d.height);
}
offScreenGraphicsDrawed = offScreenImageDrawed.getGraphics();
offScreenGraphicsDrawed.setColor(Color.white);
offScreenGraphicsDrawed.fillRect(0, 0, d.width, d.height) ;
/////////////////////
// Paint Offscreen //
/////////////////////
renderOffScreen(offScreenImageDrawed.getGraphics());
g.drawImage(offScreenImageDrawed, 0, 0, null);
}
public void renderOffScreen(final Graphics g) {
g.setColor(Color.black);
g.drawString("Test - " + counter, 100, 100);
System.out.println("INFO: paint - " + counter);
counter++;
}
private class AutomataTask extends java.util.TimerTask {
public void run() {
// Run thread on event dispatching thread
if (!EventQueue.isDispatchThread()) {
EventQueue.invokeLater(this);
} else {
if (Canvas.this != null) {
Canvas.this.repaint();
}
}
} // End of Run
}
}
public static void main(final String [] args) {
System.out.println("Running");
final JFrame frame = new JFrame("Simple Double Buffer") {
private static final long serialVersionUID = 1L;
public void processWindowEvent(java.awt.event.WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == java.awt.event.WindowEvent.WINDOW_CLOSING) {
System.exit(-1);
}
}
};
frame.setPreferredSize(new Dimension(800, 600));
frame.setBackground(Color.white);
frame.add(new Canvas());
frame.pack();
frame.setVisible(true);
}
} // End of the Class //
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