import java.applet.*;

import java.awt.*;

import java.net.*;



class Animate extends Thread

{

  Marcus mskay;



  public Animate(Marcus who)

  {

    mskay = who;

  }



  public void run()

  {

    while(mskay.running)

    {

	mskay.advanceFrame();

  	mskay.repaint();

	try

	{

	  sleep(mskay.sleeptime);

	}

	catch(Exception e){}

    }

  }

}



public class Marcus extends Applet

{

  int nframe;

  Image image[];

  AudioClip audio[];

  URL url[];

  int sleeptime;

  MediaTracker tracker;

  Animate animate;

  int frame;

  boolean running;



  private Image offScreenImage;

  private Dimension offScreenSize;

  private Graphics offScreenGraphics;



  public void advanceFrame()

  {

	frame = (frame + 1) % nframe;

  }



  public void init()

  {

	String parameter;



	// init number of frames

	parameter = getParameter("nframe");

	if (parameter == null)

	  System.out.println("Error: invalid parameter: nframe");

	else

	  nframe = Integer.parseInt(parameter);



	// init images

	image = new Image[nframe];

	tracker = new MediaTracker(this);

	for (int i = 0; i < nframe; i++)

	{

	  parameter = getParameter("image"+i);

	  if (parameter == null)

	    System.out.println("Error: invalid parameter: image"+i);

	  else

	  {

	    image[i] = getImage(getDocumentBase(), parameter);

	    tracker.addImage(image[i], i);

	  }

	}

	try

	{

	  tracker.waitForAll();

	}

	catch (InterruptedException e)

	{

	  System.out.println("Error waiting for image to load.");

	}



	// init audio

	audio = new AudioClip[nframe];

	for (int i = 0; i <nframe; i++)

	{

	  parameter = getParameter("audio"+i);

	  if (parameter != null)

	    audio[i] = getAudioClip(getDocumentBase(), parameter);

	}



	// init url

	url = new URL[nframe];

	for (int i = 0; i <nframe; i++)

	{

	  parameter = getParameter("url"+i);

	  if (parameter != null)

	  {

	  	try

	  	{

	    	  url[i] = new URL(parameter);

	 	}

	  	catch(MalformedURLException mal)

	  	{

	    	 System.out.println("Error locating URL address.");

	  	}

	  }

	}



	// init sleep time

	parameter = getParameter("sleeptime");

	if (parameter == null)

	  sleeptime = 1000;

	else

	  sleeptime = Integer.parseInt(parameter);	  

  }



  public void paint (Graphics g)

  {

    g.drawImage(image[frame], 0, 0, null);    

  }



  public final synchronized void update (Graphics g)

  {

    Dimension d = size();

    if((offScreenImage == null) || (d.width != offScreenSize.width) ||  (d.height != offScreenSize.height))

    {

      offScreenImage = createImage(d.width, d.height);

      offScreenSize = d;

      offScreenGraphics = offScreenImage.getGraphics();

    }

    offScreenGraphics.setColor(getBackground());

    offScreenGraphics.fillRect(0, 0, d.width, d.height);

    paint(offScreenGraphics);

    g.drawImage(offScreenImage, 0, 0, null);

  }





  public void stop()

  {

	running = false;

	destroy();

  }



  public boolean mouseDown(Event evt, int x, int y)

  {

	if (audio[frame] != null)

          audio[frame].play();

	return true;

  }

  public boolean mouseUp(Event evt, int x, int y)

  {

	if (url[frame] != null)

	  getAppletContext().showDocument(url[frame]);

	return true;

  }



  public boolean mouseEnter(Event evt, int x, int y)

  {

	running = true;

        animate = new Animate(this);

        animate.start();

	return true;

  }



  public boolean mouseExit(Event evt, int x, int y)

  {

	running = false;

	return true;

  }

}