JAVA: standaard voor beweging

beweging.java

import java.applet.*;
import java.awt.*;
import java.awt.Color;
import java.awt.Graphics;


public class class_name extends Applet implements Runnable{

  Thread animator;
	Integer frame, delay;
	Dimension offDimension;
	Image offImage;
	Graphics offGraphics;

    public void init()
    {
    	delay = 40;
    	frame = 0;
    	resize(800, 800);
        setFocusable(true);
    }

    /**
     * Double Buffering System
     */
    public void update(Graphics g)
    {
        Dimension d = getSize();
        if (offGraphics == null || d.width != offDimension.width || d.height != offDimension.height) {
        	offDimension = d;
        	offImage = createImage(d.width, d.height);
        	offGraphics = offImage.getGraphics();
		}

        offGraphics.setColor(getBackground());
        offGraphics.fillRect(0, 0, d.width, d.height);
        offGraphics.setColor(Color.black);
        paintFrame(offGraphics);
        g.drawImage(offImage, 0, 0, null);
    }

    public void paint(Graphics g){ update(g); }

    public void paintFrame(Graphics g)
    {

    }

    public boolean action(Event e, Object o) { return false; }

    public void start()
    {
    	animator = new Thread(this);
    	animator.start();
    }

    public void run()
    {
    	Long l = System.currentTimeMillis();
    	do {
    		if (Thread.currentThread() != animator) break;
    		repaint();
    		try {
				l += delay;
				Thread.sleep(Math.max(l - System.currentTimeMillis(), 0));
			} catch (InterruptedException e) {
				break;
			}
    		frame++;
    	} while (true);
    }

    public void stop()
    {
    	animator = null;
    	offImage = null;
    }

}