// PolysMove2.java
// A Test Animation for Polys with Double Buffering
// Copyright (C) 1996, 1997 Y.Nagatani
// nagatani@eken.phys.nagoya-u.ac.jp

import java.awt.*;
import Polys;

public class PolysMove2 extends Polys implements Runnable {

	Thread		thread = null;
	Image		imImage;		// for double buffering
	Graphics	gImage;
	public int 	interval;		// interval (mili sec)
	
	public void init() {
	
		super.init();
		
		try {interval = getIntParameter ("interval");}
		catch (NumberFormatException e) {
			interval = 500;
		}
		if (interval < 0)
			interval = 0;
		imImage = createImage (size().width, size().height);
		gImage = imImage.getGraphics ();
	}
	
	public void paint (Graphics g) {
		
		super.paint (gImage);
		g.drawImage (imImage, 0, 0, null);
	}
	
	public void update (Graphics g) {
 	
		this.paint (g);
	}
	
	public void run () {
	
		while (thread.isAlive ()) {
			repaint();
			try {
				Thread.sleep (interval);	// Delay Time
			}
			catch (InterruptedException e) {}
		}
	}
	
	public void start () {
		
		if (thread == null) {
			thread = new Thread (this);
			thread.start ();	// start thread
		}
	}
	
	public void stop () {
	
		if (thread != null) {
			thread.stop ();		// stop thread
			thread = null;		// delete thread
		}
	}
	public String[][] getParameterInfo () {
		
		String info[][] = {
			{"interval", "integer",
				"flush interval (milisecond)"}
		};
		return	info;
	}
	public String getAppletInfo () {
		
		return	"PolysMove2 (test for Polys with double buffering)\n" +
			"Copyright(C) 1996, 1997 Y.nagatani\n" +
			"nagatani@eken.phys.nagoya-u.ac.jp";
	}
}