Examples:SpaceInvaders ShotEntity

 /* * Copyright (c) 2002-2010 LWJGL Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright *  notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright *  notice, this list of conditions and the following disclaimer in the *  documentation and/or other materials provided with the distribution. * * * Neither the name of 'LWJGL' nor the names of *  its contributors may be used to endorse or promote products derived *  from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package org.lwjgl.examples.spaceinvaders;

/** * An entity representing a shot fired by the player's ship * * @author Kevin Glass * @author Brian Matzon */ public class ShotEntity extends Entity {

/** Top border at which shots are outside */ private static final int	TOP_BORDER	= -100;

/** The vertical speed at which the players shot moves */ private float							moveSpeed		= -300;

/** The game in which this entity exists */ private Game							game;

/** True if this shot has been "used", i.e. its hit something */ private boolean						used;

/**	 * Create a new shot from the player *	 * @param game The game in which the shot has been created * @param sprite The sprite representing this shot * @param x The initial x location of the shot * @param y The initial y location of the shot */	public ShotEntity(Game game, String sprite, int x, int y) { super(game.getSprite(sprite), x, y);

this.game = game; dy = moveSpeed; }

/**  * Reinitializes this entity, for reuse *  * @param x new x coordinate * @param y new y coordinate */	public void reinitialize(int x, int y) { this.x = x;		this.y = y;		used = false; }

/**	 * Request that this shot moved based on time elapsed *	 * @param delta The time that has elapsed since last move */	public void move(long delta) { // proceed with normal move super.move(delta);

// if we shot off the screen, remove ourselfs if (y < TOP_BORDER) { game.removeEntity(this); }	}

/**	 * Notification that this shot has collided with another * entity *	 * @param other The other entity with which we've collided */	public void collidedWith(Entity other) { // prevents double kills, if we've already hit something, // don't collide if (used) { return; }

// if we've hit an alien, kill it! if (other instanceof AlienEntity) { // remove the affected entities game.removeEntity(this); game.removeEntity(other);

// notify the game that the alien has been killed game.notifyAlienKilled; used = true; }	} }