package ball;

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

public class Ball extends Applet implements Runnable
{

	int x_pos = 10;
	int y_pos = 100;
	int radius = 20;
	int x_speed = 1;
	int appletsize_x = 200;
	int appletsize_y = -300;
	int qq = 0;


public void init() { }

public void start() {
	// define a new thread
	Thread th = new Thread (this);
//	 start this thread
	th.start ();
}

public void stop() { }

public void destroy() { }

public boolean mouseDown (Event e, int x, int y)
{

	x_speed = -2*(x_speed);
	qq++;



	return true;
}
public void run () {
//	 lower ThreadPriority
	Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

//	 run a long while (true) this means in our case "always"
	while (true)
	{

		if (x_pos > appletsize_x - radius)
		{

//		 Change direction of ball movement
		x_speed = -1;
		qq = 0;

		}

		if (x_pos <  radius) {
			x_speed = 1;
			qq = 0;
		}
		x_pos += x_speed;

//	 repaint the applet
	repaint();

	try
	{
//	 Stop thread for 20 milliseconds
	Thread.sleep (20);
	}
	catch (InterruptedException ex)
	{
//	 do nothing
	}

//	 set ThreadPriority to maximum value
	Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
	}
}

public void paint (Graphics g) {
//	 set color
	g.setColor (Color.red);

//	 paint a filled colored circle
	g.fillOval (x_pos - radius, y_pos - radius, 2 * radius, 2 * radius);



}

}