/* Java aquarium v1.0

 * 

 * Java aquarium using CircleWaveFilter. This demo should be JDK 1.0 

 * compatible and runnable in Netscape 3.0. 

 *

 * Written by Marcus Hoverby.  Copyright (c) 1997 Marcus Hoverby.

 * You may modify and distribute this example for non-commercial

 * purposes. This code is provided without warranty.

 */





import java.awt.*;

import java.awt.image.*;

import java.applet.*;

import java.lang.*;

import CircleWaveFilter;







public class Aquarium extends Applet implements Runnable {



  Image  im;

  CircleWaveFilter  f;

  Image[]  anim = new Image[10];

  Thread  animthread = null;

  int  count = -1;

  boolean  calculating = false;





  public void init() {

    this.showStatus("Loading picture.");

    im = this.getImage(this.getDocumentBase(), "aquarium.jpg");

    f = new CircleWaveFilter(40.0, 2.5, 80, 200, 320, 238);

    for (int n = 0; n <= 9; n++) {

      CircleWaveFilter fc = (CircleWaveFilter)f.clone();

      fc.setParam(1.0 - (double)n / 10.0);

      ImageProducer prod = new FilteredImageSource(im.getSource(), fc);	//wave image

      anim[n] = createImage(prod);

    } 

    this.showStatus("Calculating animation.");

  }







  public void paint(Graphics g) {

    if (count != -1) g.drawImage(anim[count], 0, 0, this);

  }





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







  public void start() {

    if (animthread == null) {

      animthread = new Thread(this);

      animthread.start();

      showStatus("Anim started");

    }

  }





  public void stop() {

    if ((animthread != null) && animthread.isAlive())

      animthread.stop();

    animthread = null;

  }







  public void run() {

    while (true) {

      if (++count == 10) { count = 0; }

      paint(getGraphics());

      try { Thread.sleep(30); } catch (InterruptedException e) { };

    }

  }







}