import java.applet.*;
import java.awt.*;
import java.util.*;

//This version uses buffered image to eliminate flashing

public class Rain extends Applet implements Runnable
{
	Thread thread;
	Image bImage;
	Graphics bg;
	int i = 23;
	RainDrop[] rainDrops;
	private static final int MAXDROPS = 100;

	public void init()
	{
		bImage = createImage(size().width, size().height);
		bg = bImage.getGraphics();
		rainDrops = new RainDrop[MAXDROPS];
		rainDrops[0] = new RainDrop( size().width/2, size().height/2 );
	}

	public boolean mouseUp(Event  evt, int  x, int  y)
	{
		RainDrop drop = new RainDrop( x, y );
		for ( int i = 0; i < MAXDROPS; i++ )
		{
			if ( rainDrops[i] == null )
			{
				rainDrops[i] = drop;
				break;
			}
		}
		return super.mouseUp(evt,x,y);
	}

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

	public void run()
	{
		while (true)
		{
			repaint();
			try
			{
				Thread.sleep(100);
			} catch (InterruptedException e)
			{}
		}
	}

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

	public void paint(Graphics g)
	{
		bg.setColor(getBackground());
		bg.fillRect(0, 0, size().width, size().height);
		bg.setColor(Color.blue);
		for ( int i = 0; i < MAXDROPS; i++ )
		{
			if ( rainDrops[i] == null )
				continue;

			RainDrop drop = rainDrops[i];
			drop.draw(bg,size().width,size().height);
			drop.radius += 2;
			//if ( drop.radius > size().height*2 )
			//	rainDrops[i] = null;
			if ( drop.radius > size().height/2 )
				drop.radius = 0;
		}
		g.drawImage(bImage, 0, 0, this);
	}

	public void stop()
	{
		thread.stop();
		thread = null;
	}

	public void destroy()
	{
		bg.dispose();
	}

}