laser.java

用java开发的一个实施策略游戏源码 值得学习一下

/*
	Netwar
	Copyright (C) 2002  Daniel Grund, Kyle Kakligian, Jason Komutrattananon, & Brian Hibler.

	This file is part of Netwar.

	Netwar is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	Netwar 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 Netwar; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package netwar.game.projectile;
import netwar.game.*;
import netwar.utils.*;
import netwar.utils.vectorgraphics.*;
import java.awt.Color;

/** This projectile flies straight. When it passes the target, it explodes.
 * If it lasts out its duration, it explodes.
 * @author Group N2 - Project Netwar
 * @author Daniel Grund
 */
public class Laser extends Projectile {
	Color col;
	/** Creates a new instance of ProjectileDefault */
	public Laser(Color c) {
                //The following line has been removed temporarily until I can figure out why this hurts performance so much.
		//netwar.Netwar.netwar.soundPlayer.play("sound/AttackCommand.wav");
		col = c;
	}
	/** Deal damage to the target, if it is in range. */
	protected void Explode() {
		Point3D pt = new Point3D(enemy.locate());
		if(enemy.damageable()) {
			pt.z += enemy.getHeight() / 2;
			pt.doDifference(center);
			if(pt.getLength() - enemy.getWidth() < radiusSquared)
			enemy.recieveDamage(damage);
		}
		Fizzle();
	}
	/** Move forward. Explode if it passes the enemies midpoint */
	protected void Update() {
		Point3D pt = new Point3D(enemy.locate());
		pt.z += enemy.getHeight() / 2;

		center.doSum(velocity);
		pt.doDifference(center);
		
		appearance.translate(velocity);

		if(pt.getDotProduct(velocity) < 0)
			Explode();
	}
    
	/** Projectile default will simply fizzle if its life runs out (highly unlikely)
	 * @return false
	 */
	protected boolean mustExplode() {
		return false;
	}
	
	/** Make the GraphicThing appearance.  */
	protected void makeGraphics() {
		appearance = new GraphicLine(new Point3D(center), center.getDifference(velocity), col);
	}
	
}