Android Open Source - RetroGames Bullet

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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>
 */*from   ww w.java 2 s .  com*/
 * 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;


/**
 * Class that represents a bullet. It handles the collisions with walls
 * and it tells if this bullet is valid (can be display). 
 */
public class Bullet extends Sprite
{
  /**
   * Set to true if this is a bullet from our Hero. Set to false if this
   * is an invader's bullet. 
   */
  private boolean _direction;
  
  /**
   * A bullet is valid if it can be displayed. That is, if it's contrained
   * in the display's dimensions and it hasn't reached a body yet.
   */
  public boolean _valid;

  /**
   * Constructor.
   */
  public Bullet(int x, int y, boolean direction)
  {
    super(x, y, 5);
    _direction = direction;
    _valid = false;
  }
  
  /**
   * The update method. It moves the bullet according to the direction
   * set in the constructor. 
   */
  public void update()
  {
    if (_valid) {
      if (_direction)
        _posy -= 5;
      else
        _posy += 5;
    }
  }
  
  /**
   * Invalidate this bullet if it's out of the display.
   * @param height The height of the display.
   */
  public void watch_the_walls(int height)
  {
    if (_posy < 0 || _posy > height)
      _valid = false;
  }
}

Java Source Code List

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