// tinyptc.java

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

public abstract class tinyptc extends Applet
   implements Runnable, ImageProducer {

   public tinyptc ()  {}

   public synchronized void addConsumer (ImageConsumer imageconsumer)
   {  _consm = imageconsumer;
      _consm.setDimensions (_w, _h);
      _consm.setHints (30);
      _consm.setColorModel (_dcm);
   }

   public synchronized boolean isConsumer (ImageConsumer imageconsumer)
   {  return false;  }

   public synchronized void removeConsumer (ImageConsumer imageconsumer)  {}
   public void requestTopDownLeftRightResend (ImageConsumer imageconsumer) {}

   public void startProduction (ImageConsumer imageconsumer)
   {  addConsumer (imageconsumer);  }

   public abstract void main (int i, int j);

   public void run ()
   { Dimension dim = size ();
      _w = dim.width;  _h = dim.height;
      _dcm = new DirectColorModel (32, 0xff0000, 65280, 255, 0);
      _img = createImage (this);
      main (_w, _h);
   }

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

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

   protected synchronized void paint ()
   { Graphics g = getGraphics ();
      if (_img != null && g != null)  g.drawImage (_img, 0, 0, _w, _h, null);
   }

   public synchronized void update (int ai[])
   {  if (_consm != null) {
         _consm.setPixels (0, 0, _w, _h, _dcm, ai, 0, _w);
         _consm.imageComplete (2);
      }
      paint ();
   }

   int    _w, _h;
   Thread _thr;
   Image  _img;
   DirectColorModel _dcm;
   ImageConsumer    _consm;
}