// Fly-swatting game
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class Fly extends Applet implements Runnable
{
  Thread anim;
  int fly_x, fly_y;
  boolean fly_alive = true;
  int swatter_x, swatter_y;

  public void init()
  {
	fly_x = 200; fly_y = 150;
	swatter_x = 350; swatter_y = 250;
	mseL ml = new mseL();
	addMouseListener(ml);
	addMouseMotionListener(ml);
    setBackground(Color.cyan);
  }

  public void start()
  {
	anim = new Thread(this);
	anim.start();
  }

  public void stop()
  {
	anim=null;
  }

  public void run()
  {
    while(anim != null)
    {
		updateFly();
		repaint();
		try{
		  Thread.sleep(1000);
		} catch (Exception e) {}
    }
  }
  
  public void updateFly()
  {
  	int dx = (int)(20*Math.random()-10);
  	int dy = (int)(20*Math.random()-10);
  	fly_x += dx; fly_y += dy;
  	// If offscreen, move back to center
  	if (fly_x < 0 || fly_x > 400 || fly_y < 0 || fly_y > 300)
  	{
  		fly_x = 200; fly_y = 150;
  	}
  }

  public void paint(Graphics g)
  {
 	if (fly_alive)
 	{
 		g.setColor(Color.black);
 		g.fillOval(fly_x-5, fly_y-5, 10, 10);
 	}
    g.setColor(Color.red);
    g.drawRect(swatter_x-15, swatter_y-15, 30, 30);
  }

  class mseL extends MouseAdapter implements MouseMotionListener
  {
    public void mousePressed(MouseEvent e)
    {
      int x = e.getX();
      int y = e.getY();
      if (x-15 < fly_x && fly_x < x+15 &&
	    y-15 < fly_y && fly_y < y+15)
	  {
	    // Fly is killed
	    fly_alive = false;
	  }
    }

    public void mouseMoved(MouseEvent e)
    {
      int x = e.getX();
      int y = e.getY();
      swatter_x = x;
      swatter_y = y;
      repaint();

    }

    public void mouseDragged(MouseEvent e){}
  }
}