///////    Animator.java    ///////
import java.applet.Applet;
import java.awt.*;
import java.net.URL;
import java.awt.event.*;

// This is an applet-application dual purpose program
// for general animation

// improve init so parameters are set with PARAM
// or on the command line

public class Animator extends Applet implements Runnable 
{  public void init() 
   {   codeBase = getDocumentBase();
       init2();
   }

   public void init2() 
   {   nf = 10; fps = 16;
       filename = "images/T";
       extension = ".gif";
       interval = 1000/fps;
       img = new ImageSequence(codeBase, 
                  filename, extension, nf, this, tk);
       addMouseListener(new MouseHandler()); 
   }

// starts the animation thread
   public void start()
   {   if ( ant == null )
       {   ant = new Thread(this);
           ant.start();  // thread start
       }
   }

// stops the animation thread
   public void stop()
   {   ant = null;  }

// mouse click handler
   public void beginEnd()
   {   if ( ant == null ) start();
       else stop();
   }

   public void run() 
   {   long t0;
       Thread me = Thread.currentThread();
       int n = times;
       while (ant == me) 
       {   t0 = System.currentTimeMillis();
           try 
           {   frame = img.next(nonstop);
               if ( ! nonstop && ! img.ERROR
                           && frame == null )
               {  if ( --n > 0 )
                      frame = img.next(nonstop);
                   else break;
               }
               repaint();
               t0 += interval;
               Thread.sleep(Math.max(0, 
                  t0-System.currentTimeMillis()));
           } catch (InterruptedException e)
             { break; }
       }
       ant = null;
   }

   public void setTimes(int i)
   {  if ( i > 0 ) 
      {   nonstop = false;
          times = i;
      }
      else if ( i == 0 )
	  nonstop = true;
   }

   public void update(Graphics g)
   {   int w = getSize().width, h = getSize().height;
       if ( frame != null )    // draws a frame
           g.drawImage(frame, 0, 0, w, h, Color.white, this);
       else                    // image not ready or error
       {   g.drawRect(0, 0, w, h);
           if ( img.ERROR )
               g.drawString("Error loading images!", 0, h/2);
       }
   }

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

   private final class MouseHandler extends MouseAdapter
   {   
         public void mouseClicked(MouseEvent e)
         {   beginEnd();    }
   }

   protected URL codeBase=null;          // applet codebase
   protected Thread ant;                 // the animation thread
   protected Image frame=null;           // current frame
   protected ImageSequence img;          // image manager
   protected boolean nonstop =false;     // continuous loop or not
   protected int times = 1;              // show one or more times
   protected int nf;                     // number of frames
   protected int fps;                    // frames per second
   protected int interval=0;             // time interval of a frame
   protected String filename, extension; // image files
   protected static Toolkit tk = null;   // local image loader

   public static void main(String[] args)
   {  Animator an = new Animator();
      tk = Toolkit.getDefaultToolkit();
      an.init2();
      Frame win = new Frame("Animation");
      win.add(an, "Center");
      win.setSize(an.img.width(), an.img.height());
      an.start();
      win.setVisible(true);   
   }
}