// animator applet

import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;

public class Animator extends Applet implements Runnable {
  protected Image[] images;
  protected int current_image;

  // Read basename and num_images parameters.
  // Then read in images.
  public void init() {
	String basename = this.getParameter("basename");
	int num_images;
	try {
	  num_images = Integer.parseInt(this.getParameter("num_images"));
	}
	catch (NumberFormatException e) {
	  num_images = 0;
	}

	images = new Image[num_images];
	for (int i = 0; i < num_images; i++) {
	  images[i] = this.getImage(this.getDocumentBase(),
								basename + i + ".gif");
	}
  }

  // thread that runs animation
  private Thread animator_thread = null;

  public void start() {
	if (animator_thread == null) {
	  animator_thread = new Thread(this);
	  animator_thread.start();
	}
  }

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

  public void run() {
	while(true) {
	  if (++current_image >= images.length) 
		current_image = 0;
	  this.getGraphics().drawImage(images[current_image], 0, 0, this);
	  try {
		Thread.sleep(300);
	  }
	  catch (InterruptedException e) {}
	}
  }
}