game.java

j2me入门游戏－雷电 游戏实现了最基本的功能比如飞机移动、产生飞机、发射子弹、击中敌方、爆炸等功能。

/********************************************************************
 * 项目名称				：<b>j2me学习</b>			<br/>
 * 
 * Copyright 2005-2006 Wuhua. All rights reserved
 ********************************************************************/
package org.wuhua.battleplan;

import java.util.Stack;

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

import org.wuhua.game.GameCanvas;
import org.wuhua.game.model.Fairy;
import org.wuhua.game.util.Log;

 
/**
 * <b>类名：Game.java</b> </br> 
 * 编写日期: 2006-11-30 <br/>
 * 程序功能描述：游戏的主体类。游戏的绘制，状态的改变都在这边。 <br/>
 * Demo: <br/>
 * Bug: <br/>
 * 
 * 程序变更日期 ：<br/> 
 * 变更作者 ：<br/> 
 * 变更说明 ：<br/>
 * 
 * @author wuhua </br> <a href="mailto:[e-mail]">[e-mail]</a>
 */
public class Game extends GameCanvas {
	static Log log = Log.getLog("Game");
	private Hero hero;
	
	private Stack balls;
	private Stack foes;
	
	private Stack balst;
	/**
	 * 爆炸效果索引
	 */
	private int balstIndex;
	
	/**
	 * if time = 3 的时候建立一个
	 */
	private int genaratBallTime;
	
	private int genaratFoeTime;
	
	
	Game(){
		super();
		this.setFullScreenMode(true);
	}
	
	void init(){
		
		WIDTH = getWidth();
		HEIGHT = getHeight();
		log.debug("WIDTH=" + WIDTH);
		log.debug("hegiht=" + HEIGHT);
		this.bufferImage = Image.createImage(WIDTH, HEIGHT);
		 
		Platform.WIDTH = this.getWidth();
		Platform.HEIGHT = this.getHeight();
		
		
		hero = Hero.createHero(Platform.WIDTH/2, Platform.HEIGHT -30);
	 
		balst = new Stack();
		 
	}
	
	void genaratorBalst(int x, int y){
		balst.addElement(new Fairy(Resources.BLAST[0], x, y));
		balst.addElement(new Fairy(Resources.BLAST[1], x, y));
		balst.addElement(new Fairy(Resources.BLAST[2], x, y));
		balst.addElement(new Fairy(Resources.BLAST[3], x, y));
		balst.addElement(new Fairy(Resources.BLAST[4], x, y));
	}
	
	/**
	 * 碰撞。实在没有好的实现。 我想不出来了
	 *
	 */
	void collides(){
		if(balls == null 
				|| foes == null)
			return ;
		for(int i = 0; i < balls.size(); i ++){
			Ball b = (Ball) balls.elementAt(i);
			for(int j =0; j < foes.size(); j ++){
				Foe f = (Foe) foes.elementAt(j);
				if(b.collidesWith(f)){
					this.genaratorBalst(f.getX(), f.getY());
					balls.removeElement(b);
					foes.removeElement(f);
					return;
				}
			 
			}
		}
	}
	
	/**
	 * 绘制游戏场景跟Hero
	 *
	 */
	void drawGame(){
		if(Platform.HEIGHT < this.getHEIGHT()){
			Platform.HEIGHT = this.getHEIGHT();
		}
		
		Graphics g = this.getGraphics();
		if(g == null)
			return;
		fillFullScreen(g,0x349293);
		paintHeroAndBall(g);
		
		paintFoe(g);
		
		paintBalst(g);
		this.flushGraphics();
	}

	private void paintBalst(Graphics g) {
		 
		if(balst == null 
				|| balst.size() == 0)
			return;
		
		Fairy bf = (Fairy) balst.elementAt(balstIndex);
		bf.paint(g);
		if(balstIndex >= 4){
			balstIndex = 0;
			balst.removeAllElements();
		}
			
		balstIndex++;
	}

	/**
	 * 绘制敌机
	 * @param g
	 */
	private void paintFoe(Graphics g) {
		if(foes == null)
			return ;
		for(int i=0; i < foes.size(); i++){
			Foe foe = (Foe) foes.elementAt(i);
			foe.paint(g);
		}
		
	}
	
	/**
	 * 制造敌飞机
	 *
	 */
	public void genaratorFoe(){
		if(this.genaratFoeTime == 5){			
			FoeManager.addFoe(FoeManager.genarator());
			FoeManager.clearFoesIsOut();
			foes = FoeManager.getFoes();
			genaratFoeTime = 0;
		}
		
		genaratFoeTime++;
	}
	
	
	public void foeFly(){
		if(foes == null)
			return ;
		for(int i = 0; i < foes.size(); i++){
			Foe foe = (Foe) foes.elementAt(i);
			foe.fly();
		}
	}

	private void paintHeroAndBall(Graphics g) {
		hero.paint(g);
		paintBalls(g);
	}

	private void paintBalls(Graphics g) {
		if(balls == null)
			return ;
		for(int i = 0; i < balls.size(); i++){
			Ball ball = (Ball) balls.elementAt(i);
			ball.paint(g);
		}
		
	}
	
	public void ballFly(){
		if(balls == null)
			return ;
		for(int i = 0; i < balls.size(); i++){
			Ball ball = (Ball) balls.elementAt(i);
			ball.fly();
		}
	}
	
	
	public void heroAction(){
		checkHeroIsExists();
		int keyCode = this.getKeyStates();
		 
		switch(keyCode){
		case Platform.KEY_LEFT: hero.moveLeft(); break;
		case Platform.KEY_RIGHT: hero.moveRight(); break;
		case Platform.KEY_UP: hero.moveUp(); break;
		case Platform.KEY_DOWN: hero.moveDown(); break;
		case Platform.KEY_FIRE: genaratorBall(); break;
		}
	}

	/**
	 * 创建子弹
	 *
	 */
	private void genaratorBall() {
	 
		if(this.genaratBallTime == 3){
			checkHeroIsExists();
			
			BallManager.addBall(BallManager.genarator(hero.getX(), hero.getY()));
			BallManager.clearBallsIsOut();
			balls = BallManager.getBalls();
			genaratBallTime = 0;
		}
		
		genaratBallTime++;
		
		
	}

	private void checkHeroIsExists() {
		if(hero == null){
			throw new java.lang.NullPointerException("Hero is Null");
		}
	}

	/**
	 * 游戏的run。控制游戏个各个方面
	 *
	 */
	public void run(){
		this.collides();
		this.heroAction();
		this.ballFly();
		this.genaratorFoe();
		this.foeFly();
		
		this.drawGame();
		this.setKeyStates(1000);
	}
}