Android Open Source - RetroGames Pong Sprite

• Back to App/course  ↑

From Project

Back to project page RetroGames.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2012 Miquel Sabat <mikisabate@gmail.com>
 *//from  w w  w  .  j a  v  a2 s  . co m
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


package com.mssola.games;

import com.mssola.helpers.Sprite;
import java.util.Random;
import android.graphics.Rect;


/**
 * The Sprite that represents the ball.
 */
public class PongSprite extends Sprite
{
  public int _vx, _vy, _goal;
  private int _height, _width, _lives;

  /**
   * Constructor. 
   */
  public PongSprite(int v, int height, int width, int size)
  {
    _vx = _vy = v;
    _height = height;
    _width = width;
    _size = size;
    new_posx();
    _posy = height / 2;
    _lives = 3;
  }

  /**
   * Update the current position and how many lives this ball still has.
   */
  public void update()
  {
    _posx += _vx;
    _posy += _vy;
    _goal = 0;
    if (_posy > _height) {
      --_lives;
      _goal = 1;
      if (_lives > 0) {
        new_posx();
        _posy = _height / 2;
      }
    } else if (_posy < 0) {
      --_lives;
      _goal = -1;
      if (_lives > 0) {
        new_posx();
        _posy = _height / 2;
      }
    }
  }
  
  /**
   * If this ball is not between the given integers, change the
   * acceleration on the x axis.
   * @param left The minimum value.
   * @param right The maximum value.
   */
  public void change_if_not_between(int left, int right)
  {
    if (_posx < left || _posx > right)
      _vx *= -1;
  }
  
  /**
   * Change the acceleration on the y axis.
   */
  public void change()
  {
    _vy *= -1;
  }
  
  /**
   * Return true if a team has scored with thi ball, false otherwise.
   */
  public int scored()
  {
    return _goal;
  }
  
  /**
   * @return a Rect representing this ball.
   */
  public Rect get_sprite()
  {
    return new Rect(_posx, _posy, _posx + _size, _posy + _size);
  }
  
  /**
   * Set a random value to the position on the x axis.
   */
  private void new_posx()
  {
    Random r = new Random();
    _posx = r.nextInt(_width - 20);
  }
  
  /**
   * Get how many lives has this ball.
   */
  public int get_lives()
  {
    return _lives;
  }
}

Java Source Code List

• Back to App/course  ↑