/*
  * File: Paddle.java
  * Author: Java, Java, Java
  * Description: This class represents a paddle for the Pong game.
  *  The paddle is a vertical line segment located at the right boundary.
  *  Its motion is controlled by the user via up/down arrow keys. Therefore
  *  the paddle needs a reference to the applet. The Paddle class contains
  *  move() and draw() methods.
  */
public class Paddle {
   public static final int HEIGHT = 50;        // Size of Paddle
   public static final int WIDTH = 10;        // Size of Paddle
   private static final int DELTA = HEIGHT/2;  // Size of each move
   private static final int BORDER = 0;
   private int gameAreaHeight;
   private int locationX, locationY;
   private PongApplet applet;

   /**
    * Paddle() constructor is passed a reference to the applet, which it
    *  uses to determine the dimensions of the game area.
    */
   public Paddle (PongApplet a) {
       applet = a;
       gameAreaHeight  = a.getHeight();
       locationX = a.getWidth()-WIDTH;
       locationY = gameAreaHeight/2;
   } // Paddle()

    public void resetLocation() {
       gameAreaHeight  = applet.getHeight();
       locationX = applet.getWidth()-WIDTH;
    }
     /**
      * Return the x coordinate of the paddle's location
      */
     public int getX() {
         return locationX;
     }

     /**
      * Return the x coordinate of the paddle's location
      */
     public int getY() {
         return locationY;
     }

   /**
    * moveUp() moves the paddle up by a fixed DELTA
    */
   public void moveUp () {
       if (locationY > BORDER )
           locationY -= DELTA;
   } // moveUp()

   /**
    * moveDown() moves the paddle down by a fixed DELTA
    */
   public void moveDown() {
       if (locationY + HEIGHT < gameAreaHeight - BORDER)
           locationY += DELTA;
   } // moveDown()
} // Paddle