Android Open Source - RetroGames Pong Enemy

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2012 Miquel Sabat <mikisabate@gmail.com>
 */*  w ww.  ja v a  2  s .  c o 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;


/**
 * Implements the logic of the enemy on the Pong game. 
 */
public class PongEnemy extends Sprite
{
  private int _level, _counter, _watched;
  private boolean _direction;
  
  /**
   * Constructor. 
   */
  public PongEnemy(int x, int y, int size, int level)
  {
    super(x, y, size);
    _level = level;
    _counter = 0;
    _direction = true;
    if (level == 1)
      _posx -= 90;
    else if (level == 2)
      _posx -= 150;
  }
  
  /**
   * Check the level of difficulty to select the required algorithm. 
   */
  public void next_move()
  {
    switch (_level) {
      case 1: level1(); break;
      case 2: level2(); break;
      case 3: level3(); break;
    }
  }
  
  /**
   * Store the given position.
   * @param pos The given position.
   */
  public void watch_position(int pos)
  {
    _watched = pos;
  }
  
  /**
   * Go left and right, not too fast, not too smart.
   */
  private void level1()
  {
    ++_counter;
    if (_counter > 90) {
      _direction = !_direction;
      _counter = 0;
    }
    if (_direction)
      _posx += 1;
    else
      _posx -= 1;
  }
  
  /**
   * Go left and right, faster than the first algorithm.
   */
  private void level2()
  {
    ++_counter;
    if (_counter > 80) {
      _direction = !_direction;
      _counter = 0;
    }
    if (_direction)
      _posx += 3;
    else
      _posx -= 3;
  }
  
  /**
   * Go after the watched position.
   */
  private void level3()
  {
    if (_watched > _posx)
      _posx += 3;
    else
      _posx -= 3;
  }
}

Java Source Code List

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