samer@0: package samer.applet;
samer@0: 
samer@0: import java.awt.*;
samer@0: import java.awt.event.*;
samer@0: import java.util.Random;
samer@0: import samer.core.*;
samer@0: import samer.core.util.heavy.VCanvas;
samer@0: import samer.tools.*;
samer@0: 
samer@0: public class Sierpinski extends VCanvas implements Task, Agent
samer@0: {
samer@0: 	Random		rnd=new Random();
samer@0: 	RThread		rthread;
samer@0: 	int			x=0, y=0, w=0, h=0;
samer@0: 
samer@0: 	public Sierpinski()
samer@0: 	{
samer@0: 		Shell.trace("creating RThread");
samer@0: 		rthread = new RThread(this);
samer@0: 
samer@0: 		Shell.trace("obtaining window");
samer@0: 		Shell.Window win=Shell.getWindow("Sierpinski");
samer@0: 		win.container().setLayout(new BorderLayout());
samer@0: 		win.container().add(this,"Center");
samer@0: 		win.expose();
samer@0: 		win.addWindowListener( new WindowAdapter() {
samer@0: 			public void windowClosing(WindowEvent e) {
samer@0: 				Shell.print("Sierpinski terminating");
samer@0: 				// how can I destroy the RThread?
samer@0: 				// exposing commands creates actionListeners
samer@0: 				// which refer to the Agent, thus stopping the
samer@0: 				// Agent from being garbage-collected
samer@0: 				dispose();
samer@0: 			}
samer@0: 		} );
samer@0: 
samer@0: 		Shell.trace("exposing commands");
samer@0: 		exposeCommands(rthread);
samer@0: 		exposeCommands(this);
samer@0: 		Shell.registerAgent(this);
samer@0: 		Shell.exposeCommands(rthread);
samer@0: 		Shell.exposeCommands(this);
samer@0: 	}
samer@0: 
samer@0: 	public void dispose()
samer@0: 	{
samer@0: 		Shell.deregisterAgent(this);
samer@0: 		rthread.dispose();
samer@0: 	}
samer@0: 
samer@0: 	public void getCommands(Agent.Registry r) { r.add("clear"); }
samer@0: 	public void execute(String cmd, Environment env) throws Exception{
samer@0: 		if (cmd.equals("clear")) repaint();
samer@0: 	}
samer@0: 
samer@0: 	public void run() throws Exception
samer@0: 	{
samer@0: 		int    j=Math.abs(rnd.nextInt())%3;
samer@0: 
samer@0: 		if (j==0)      { x=x/2; y=y/2; }
samer@0: 		else if (j==1) { x=x/2; y=h+y/2; }
samer@0: 		else           { x=w+x/2; y=y/2; }
samer@0: 
samer@0: 		graphics.fillRect( x, y, 1, 1);
samer@0: 	}
samer@0: 
samer@0:  	public void stopping() { Shell.print("stopping"); }
samer@0: 	public void starting() { Shell.print("starting"); }
samer@0: 	public void realized() { Shell.print("realized"); sized(); }
samer@0: 	public void sized() { w=width/2; h=height/2; }
samer@0: }