VliegendeKop.java
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class VliegendeKop extends Applet
                                                            implements Runnable {

        int frameNumber = -1;
        int delay = 100;
        Thread animatorThread;
        static String fgFile = "v4_java_logo.gif";
        Image fgImage;
                
        public void init() {
                //Get the image.
                fgImage = getImage(getCodeBase(), fgFile);
        }
                
        public void start() {
                if (animatorThread == null) {
                        animatorThread = new Thread(this);
                }
                animatorThread.start();
        }

        public void stop() {
                animatorThread = null;
        }

        public void run() {
                //Just to be nice, lower this thread's priority
                //so it can't interfere with other processing going on.
                Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

                //Remember the starting time.
                long startTime = System.currentTimeMillis();

                //Remember which thread we are.
                Thread currentThread = Thread.currentThread();

                //This is the animation loop.
                while (currentThread == animatorThread) {
        
                        //Advance animation frame.
                        frameNumber++;
                        //Display and progress.
                        repaint();

                        //Delay depending on how far we are behind.
                        try {
                                startTime += delay;
                                Thread.sleep(Math.max(0, 
                                                          startTime-System.currentTimeMillis()));
                        } catch (InterruptedException e) {
                                break;
                        }
                }
        }
        //Draw the current frame of animation.
        public void paint(Graphics g) {
                int compWidth = getWidth();
                int compHeight = getHeight();
                int imageWidth, imageHeight;

                //If we have a valid width and height for the 
                //foreground image, draw it.
                imageWidth = fgImage.getWidth(this);
                imageHeight = fgImage.getHeight(this);
                if ((imageWidth > 0) && (imageHeight > 0)) {
                        g.drawImage(fgImage, 
                                                ((frameNumber*5)
                                                    % (imageWidth + compWidth))
                                                    - imageWidth,
                                                (compHeight - imageHeight)/2,
                                                this);
                }
        }
}