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


public class AnimEx7 extends Applet implements Runnable {
    int frame;
    int delay;
    int step1=5,step2=2;
    Thread animator;

    Dimension offDimension;
    Image offImage;
    Graphics offGraphics;

	MediaTracker tracker;

    Image image[] = new Image[10];
    AudioClip bubble;


    public void init() {
	String str = getParameter("fps");
	int fps = (str != null) ? Integer.parseInt(str) : 10;
	delay = (fps > 0) ? (1000 / fps) : 100;
	tracker = new MediaTracker(this);
	for(int i=0; i<10; i++){
	   image[i]=getImage(getCodeBase(),"images/T"+(i+1)+".gif");
	   tracker.addImage(image[i],0);
	}
	bubble = getAudioClip(getCodeBase(),"images/bubble.au");

    }

    /**
     Create a thread and start it.
     */
    public void start() {
		animator = new Thread(this);
		animator.start();
    }

    /**
     * the main animation.
     */
    public void run() {
	// Remember the starting time
	long tm = System.currentTimeMillis();
	while (Thread.currentThread() == animator) {
	// Display the next frame of animation.
	   repaint();
	   // Delay depending on how far we are behind.
	   try {
	      tm += delay;
	      Thread.sleep(Math.max(0,tm-System.currentTimeMillis()));
	   } catch (InterruptedException e) {break;  }

	   // Advance the frame
	   frame++;
	}
    }

    /**
     * called when the applet is no longer visible. 
     */
    public void stop() {
		animator = null;
		offImage = null;
		offGraphics = null;
    }

    /**
     * Update a frame of animation.
     */
    public void update(Graphics g) {
    	Color fgr=getForeground();
		Dimension d = getSize();

		// Create the offscreen graphics context
		if ((offGraphics == null)
	 	  || (d.width != offDimension.width)
	 	  || (d.height != offDimension.height)) 
	    {	offDimension = d;
	    	offImage = createImage(d.width, d.height);
	    	offGraphics = offImage.getGraphics();
		}

		// Erase the previous image
		offGraphics.setColor(getBackground());
		offGraphics.fillRect(0, 0, d.width, d.height);
		offGraphics.setColor(fgr);

		// Paint the frame into the image
		paintFrame(offGraphics);

		// Paint the image onto the screen
		g.drawImage(offImage, 0, 0, this);
    }


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

    /**
     * Paint a frame of animation.
     */
    public void paintFrame(Graphics g) {
	// Only paint when all images have arrived
	if (tracker.statusID(0, true) == MediaTracker.COMPLETE) 
	   g.drawImage(image[frame % 10], 0, 0, this);
	// Play the bubble audio when Duke waves
	if ((frame % 10) == 3) 
	   bubble.play();

    }
}