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

public class Animate extends java.applet.Applet implements Runnable
{
  Image mImages[];
	Thread mTimerThread;
  int mImageCount;
	int mSleepTime;
	int mImageIndex;
	String mImagePrefix;

	MediaTracker mMediaTracker;

	public Animate()
	{
	}
	public void init()
	{
	  mImageCount=Integer.parseInt(getParameter("image_count"));
		mSleepTime=Integer.parseInt(getParameter("sleep"));
		mImagePrefix=getParameter("prefix");
	  mImages=new Image[imageCount()];
		mImageIndex=0;
	}
	public void start()
	{
	  if(null==mTimerThread){mTimerThread=new Thread(this);mTimerThread.start();}
		if(null==mMediaTracker)mMediaTracker=new MediaTracker(this);
		for(int mediaIndex=0;mediaIndex<imageCount();mediaIndex++)
		{
		  String postFix=String.valueOf(mediaIndex+1);
		  mMediaTracker.addImage(mImages[mediaIndex]=getImage(getCodeBase(),imagePrefix()+postFix+".jpg"),mediaIndex);
		}
		try{mMediaTracker.waitForAll(50);}
		catch(InterruptedException interruptedException){;}
		repaint();
	}
	public void stop()
	{
	  if(null!=mTimerThread)
		{
		  mTimerThread.stop();
			mTimerThread=null;
		}
	}
	public void run()
	{
	  while(mTimerThread!=null)
		{
		  try{Thread.sleep(sleepTime());}
			catch(InterruptedException interruptedException){;}
			repaint();
			mImageIndex++;
			if(mImageIndex>=imageCount())mImageIndex=0;
		}
	}
	public void update(Graphics graphics)
	{
	  paint(graphics);
	}
	public void paint(Graphics graphics)
	{
	  if(true==mMediaTracker.checkID(mImageIndex))graphics.drawImage(mImages[mImageIndex],0,0,this);
		else if(true==mMediaTracker.checkID(0))graphics.drawImage(mImages[0],0,0,this);
	}
	private int imageCount()
	{
	  return mImageCount;
	}
  private int sleepTime()
  {
    return mSleepTime;
  }
	private String imagePrefix()
	{
	  return mImagePrefix;
	}
}