package samsjava;

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;


public class game extends Applet {
   paddle computer = new paddle();
   paddle human = new paddle();
   ball Ball = new ball();
   java.util.Timer timer;
   Graphics doublebuffer;
   Image offscreen;
   int input = 0;
   private final int WIDTH =640;
   private final int HEIGHT = 480;
  
   public class ball 
   {
    int x = 320;
    int y = 240;
    double xspeed=0;
    double yspeed=1;
    int size = 20;
    int direction = -1;;
    int speed=5;
    
    public void move () {
            
        if(direction == 1){
            y-=yspeed;
            x-=xspeed;
        }
        if(direction == -1){
            y+=yspeed;
            x+=xspeed;
        }
    }
    public void playerhit () 
    {
direction=1;
 xspeed = speed*Math.sin(human.x-Ball.x*(Math.PI/180));
 xspeed*=-1;
            }
    public void wallhit(){
xspeed*=-1;
    }
    
    public void computerhit(){
 direction=-1;
 
 xspeed = speed*Math.sin(computer.x-Ball.x*(Math.PI/180));
 xspeed*=-1;
    }

     public void reset(){
   x = 320;
   y = 240;
   size = 20;
   direction = -1;
    int xspeed=0;
    int yspeed=1;
 } }
   public class paddle { 
    int x = 0;
    int y = 0;
   
    int width = 80;
    int height = 20;
   }
   
    public void init()
    {
        
        human.y=440;
        computer.y=0;
        this.setSize(WIDTH,HEIGHT);
        timer = new java.util.Timer();
        timer.schedule(new gameTask(),0,1*10);
        offscreen = createImage(640,480);
        doublebuffer = offscreen.getGraphics();
 
    }
  class gameTask extends TimerTask 
  {
     public void run(){
         
         if(Ball.y>690){
             Ball.reset();
         }
         
         if(Ball.x>640 || Ball.x<0){
             Ball.wallhit();
         }
            if(Ball.x-human.x>0 && Ball.x-human.x<80){
            if(Ball.y>420 && Ball.y<460){
                Ball.playerhit();
            }}
          if(Ball.x-computer.x>0 && Ball.x-computer.x<80){
            if(Ball.y>0 && Ball.y<20){ 
                Ball.computerhit();
            }
          }
     Ball.move();
     computer.x=(Ball.x)-40;
     human.x+=input;
         repaint();
         
         
     } 
  } 

   
public boolean keyDown(Event evt,int key)
	{
	
	switch (key)
	{
	
	case Event.LEFT:
            if(human.x>0){
            if(input>0){
                input=0;
            }
				input-= 2;
            }
				break;
	
	case Event.RIGHT:
             if(human.x<600){
              if(input<0){
                input=0;
            }
				input+= 2;
             }
				break;
				

			}
			return true;
			}

 public void update(Graphics g)
     {
          paint(g);
     }
 
  public void paint(Graphics g)
  {
      
      doublebuffer.clearRect(0,0,640,480);
      doublebuffer.fillRect(human.x,human.y,human.width,human.height);
      doublebuffer.fillOval(Ball.x,Ball.y,Ball.size,Ball.size);
      doublebuffer.fillRect(computer.x,computer.y,computer.width,computer.height);
      g.drawImage(offscreen,0,0,this);
  
  }
  }