AppletAnimator


import java.applet.*;
import java.awt.*;

public class appletanimator extends Applet implements Runnable {

public Thread animationthread = null;

//The Image array "images" must be global.
Image images[];

//The variable "currentimage" will hold the
//image currently being displayed.
int currentimage=0;

public void init()
{
    //Init "images" to have four elements.
    images=new Image[4];
    MediaTracker tracker=new MediaTracker(this);

    //We use a for-loop to load the images.
    for (int i=0; i<4; i++)
    {
        //"image0.gif","image1.gif",...,"image3.gif" will be
        //loaded.
        images[i]=getImage(getDocumentBase(),"image"+i+".gif");

        //The ID for each image must be increased
        //for each image that is added to the
        //tracker.
        tracker.addImage(images[i],i);
    }
    //Finally we must make sure the tracker loads the images.
    try {tracker.waitForAll();}
    catch(InterruptedException e)
    {
        System.out.println("Something happened while reading images...");
    }
}

public void start()
{
    if (animationthread == null)
    {
         animationthread = new Thread(this,"animationthread");
         animationthread.start();
    }
}

public void stop()
{
    if ((animationthread != null) && animationthread.isAlive())
        animationthread.stop();
    animationthread = null;
}

public synchronized void paint(Graphics g)
{
    //The integer "currentimage" is used as
    //index for the "images" array.
    g.drawImage(images[currentimage],0,0,this);
}

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

public void run()
{
    while (true)
    {
        update(getGraphics());

        //"currentimage" is increased so that the next
        //image is displayed in the next screen update.
        currentimage++;

        //However, "currentimage" must not exceed the
        //index value of 3.
        if (currentimage>3) currentimage=0;
        try {Thread.sleep(200);}
        catch(InterruptedException e) {}
    }
}

}
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