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

public class JumpingBall3 extends Applet implements Runnable
{
	int X,Y;
	double SinX=0.0, SinY=0.0;
	double SinOffX=2*Math.PI / 180, SinOffY = 5*Math.PI / 180;
	Thread Animation;

	private Image imBuffer;
	private Graphics grBuffer;


	public void init()
	{
    	resize(400, 150);
		imBuffer = createImage(400,150);
		grBuffer = imBuffer.getGraphics();
		grBuffer.setColor(getBackground());
		grBuffer.fillRect(0,0,400,150);
	}

	public void paint(Graphics g)
	{
		g.drawImage(imBuffer,0,0,this);
		X = 200 + (int)(180*Math.sin(SinX));
		SinX+=SinOffX;
		Y = 120 - (int)(Math.abs(120*Math.sin(SinY)));
		SinY+=SinOffY;

		grBuffer.setColor(getBackground());
		grBuffer.fillRect(0,0,400,150);
		grBuffer.setColor(Color.blue);
		grBuffer.fillOval(X,Y,20,20);
	}


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

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

	}
	
	public void stop()
	{
		if (Animation != null)
		{
			Animation = null;
		}
	}

	public void run()
	{
		while (true)
		{
 			try
			{
				Animation.sleep(40);
			} 
			catch(Exception e)
			{
			}
         repaint();
		}
	}
}