// CS 134 demo to play the game of Pong
// This version constrains the paddle to stay in court boundary

import objectdraw.*;
import java.awt.*;

public class Pong3 extends WindowController{

    // position and dimensions of the court
    private static final int COURT_LEFT = 50,
                    COURT_TOP = 50,
                    COURT_HEIGHT = 300,
                    COURT_WIDTH = 250;
                    
    // dimensions of the paddle
    private static final int PADDLE_WIDTH = 50,
                             PADDLE_HEIGHT = 20;

    private FilledRect paddle;      // paddle shape
    
    private FramedRect boundary;    // the boundary of the playing area.
    
    // make the playing area and paddle
    public void begin()
    {   
        boundary = new FramedRect(COURT_LEFT, COURT_TOP,
                                  COURT_WIDTH, COURT_HEIGHT,
                                  canvas);

        paddle = 
            new FilledRect(COURT_LEFT + (COURT_WIDTH-PADDLE_WIDTH)/2,
                           COURT_TOP + COURT_HEIGHT - PADDLE_HEIGHT -1,
                           PADDLE_WIDTH, PADDLE_HEIGHT,
                           canvas);
    }
    
    // make a new ball when the player clicks
    public void onMouseClick(Location point)
    {
         new MovingBall(canvas, paddle, boundary);
    }
    
    // Move paddle in response to mouse move.
    // Make sure it stays in the court
    public void onMouseMove(Location point)
    {
        if ( point.getX() < COURT_LEFT )
        {
            // off left side - place paddle at left edge of the court
            paddle.moveTo( COURT_LEFT,
                       COURT_TOP + COURT_HEIGHT - PADDLE_HEIGHT -1);
        }
        else if ( point.getX() > COURT_LEFT + COURT_WIDTH - PADDLE_WIDTH)
        {
            // off right side - place paddle at right edge of the court
            paddle.moveTo( COURT_LEFT + COURT_WIDTH - PADDLE_WIDTH,
                       COURT_TOP + COURT_HEIGHT - PADDLE_HEIGHT -1);
        }
        else
        {
            // keep the edge of the paddle lined up with the mouse
            paddle.moveTo( point.getX(),
                       COURT_TOP + COURT_HEIGHT - PADDLE_HEIGHT -1);
        }
    }
       
}