Re: Graphics help please

On Sat, 26 Jan 2008 20:31:18 -0000, Knute Johnson <nospam@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

Actually, I don't think the code below helps me much with what I want to do (draw images pixel by pixel) as I don't want to clear the entire image before displaying the changes, which is effectively what happens below. I just used the circle as test code to render with pixels. How do I just add to the image and then display that without clearing it each time?

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class test2 extends JPanel implements Runnable {
private volatile int angle;

public test2() {
setPreferredSize(new Dimension(300,300));
}

public void run() {
while (--angle >= -360) {
repaint();
try {
Thread.sleep(20);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}

public void paintComponent(Graphics g2D) {
Graphics2D g = (Graphics2D)g2D;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(Color.WHITE);
g.fillRect(0,0,getWidth(),getHeight());
g.setColor(Color.BLUE);
g.drawArc(0,0,getWidth()-1,getHeight()-1,90,angle);
}

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
test2 t2 = new test2();
f.add(t2);
f.pack();
f.setVisible(true);
new Thread(t2).start();
}
});
}
}


.

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