gamescreen.java

一个J2ME编译的打地鼠小游戏,供初学者学习

import java.io.IOException;
import java.util.Random;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.TextField;
import javax.microedition.rms.InvalidRecordIDException;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.RecordStoreFullException;
import javax.microedition.rms.RecordStoreNotOpenException;


public class GameScreen extends Canvas implements Runnable{
    
	private GameMidlet gml;
	private Image offScreenBuffer;
	private Graphics bg;
	private int screenW;
	private int screenH;
	//缩放倍数
	private static double scale_x;
	private static double scale_y;
	/*游戏线程*/
	private boolean running = true;
	private long lastTime = 0;
	/*FPS*/
	private int cps = 0;
	private int second = 0;
	private final int CPS = 60;
	private boolean show = false;
	/**/
	private int key = -100;
	private int menu_index;  //菜单选项索引
	//游戏背景
	private Image menuback_img;
	private Image topscore_img;
	private Image gamemap_img;
	private Image title_img;
	/*锤子*/
	private Image snk_img;
	private int Snk_Positions[][] = {
			{-4,34},{58,39},{116,39},
			{-4,70},{54,73},{114,73},
			{-4,110},{55,110},{115,109}
	};
	private int index = 0;
	private int frame = 0;
	/*星星*/
	private Image starts_img;
	private int Starts_Positions[][] = {
			{ 0, 70},{60, 78},{118,81},
			{ 0,112},{55,112},{114,117},
			{-2,151},{57,152},{116,151}
	};
	private int count;                  //计数器
	private int speed = 6;              //下锤速度
	//
	private ShrewMouse mouse = null;
	private Random rmd = new Random();
	/*时间控制器*/
	private int timer = 0;
	/*游戏速度*/
	private int game_sp;
	/*是否命中*/
	private boolean isHit = false;
	/*操作记录*/
	private boolean hasMove = false;
	/*积分系统*/
	private int score = 0;
	private final int MaxLevel = 3;      //关数
	private int job;                     //需完成的连击次数
	private int got = 0;                 //连击次数
	private Image times_2 = null;
	private int miss = 0;                //错过次数
	private Image devide_2 = null;
	private boolean Add = false;
	private boolean Minus = false;
	private Image score_img = null;
	private int sc_x,sc_y;
	/*游戏状态*/
	static final int game_Start = 0;
	static final int game_Pause = 1;
	static final int game_Over = -1;
	static final int game_Menu = 2;
	static final int game_Setting = 3;
	static final int game_Record = 4;
	static final int game_About = 5;
	static final int game_Quit = 6;
	static final int game_Pass = 7;
	
	private static int GameState;  //当前游戏状态
	//private boolean wait = false;   //等待玩家按键
	
	/*RMS-游戏记录*/
	private GameRecord gr;
	private Form f_record;
	private GameScreen gs;  //本类自身
	//时间条
	private int game_time = 120;
	private int level = 1;
	private boolean LevelUp = false;
	//暂停画面
	private int lx,rx;
	private boolean done = false;
	//游戏帮助
	private int n;                 //每行打印的字数
	private int row;               //每行的位置 
	private int start;        
	private int end;
	
	/*字体*/
	private final Font f1 = Font.getFont(Font.FACE_PROPORTIONAL, 
			                              Font.STYLE_BOLD, 
			                               Font.SIZE_LARGE);           
	private final Font f2 = Font.getFont(Font.FACE_SYSTEM, 
                                          Font.STYLE_PLAIN, 
                                           Font.SIZE_LARGE);            
	/*色彩表*/
	private final int black = 0x000000;
	private final int white = 0xffffff;
	private final int red   = 0xff0000;
	private final int blue  = 0x0000ff;
	/*声音*/
	private boolean sound_on_off = true;
	private AudioPlayer p1;
	private AudioPlayer p2;
	private AudioPlayer p3;
	
	/**
	 * 在构造函数中 获取离屏屏幕画笔
	 * 初始化图片资源
	 * @param gameMidlet
	 */
	public GameScreen(GameMidlet gameMidlet){
		setFullScreenMode(true); //全屏模式
	    gml = gameMidlet;
	    gs = this;
	    screenW = getWidth();    //获取屏幕宽
	    screenH = getHeight();   //获取屏幕高
	    //计算缩放比率,使屏幕自适应
	    scale_x = screenW/180.5;
	    scale_y = screenH/220.0;
	    //创建缓冲区
	    offScreenBuffer = Image.createImage(screenW,screenH);
	    bg = offScreenBuffer.getGraphics();
	    //属性初始化
	    GameState = game_Menu;  //默认为游戏菜单
	    menu_index = 0;
	    /*创建一个地鼠*/
	    mouse = new ShrewMouse();
	    mouse.setSpeed(3000);
	    /*创建RMS*/
	    gr = new GameRecord("record");
	    initPic();  //资源初始化
	    initGame(); //属性初始化
	    /* 启动线程 */
	    Thread t = new Thread(this);
	    t.start();
	}
	/*********************************************************************/
	/*                         图片资源初始化                                   */
	/*********************************************************************/
	private void initPic() {
		try {
			switch(GameState){
			case game_Start:{
				if(gamemap_img==null){
				    gamemap_img = Image.createImage("/gb0.png");
				    gamemap_img = scaleImage(gamemap_img, screenW, screenH);          //缩放
				}
		        if(snk_img==null){
				    snk_img = Image.createImage("/martello.png");
				    snk_img = scaleImage(snk_img, (int)(snk_img.getWidth()*scale_x),  //缩放
				    		                       (int)(snk_img.getHeight()*scale_y));
				    snk_img = alfImage(snk_img, -1);                   //使图片原来的透明区域恢复
		        }
		        if(score_img==null){
				    score_img = Image.createImage("/start.png");
				    score_img = scaleImage(score_img,
				    		                (int)(score_img.getWidth()*scale_x),
				    		                 (int)(score_img.getHeight()*scale_y));
				    score_img = alfImage(score_img, -1);
		        }
		        if(starts_img==null){
				    starts_img = Image.createImage("/stelle.png");
				    starts_img = scaleImage(starts_img,
				    		                (int)(starts_img.getWidth()*scale_x),
		                                     (int)(starts_img.getHeight()*scale_y));   //缩放
				    starts_img = alfImage(starts_img, -1);             //使图片原来的透明区域恢复
		        }
		        if(times_2==null){
		        	times_2 = Image.createImage("/x2.PNG");
		        	times_2 = scaleImage(times_2,
		        			             (int)(times_2.getWidth()*scale_x),
                                          (int)(times_2.getHeight()*scale_y));   //缩放
                    times_2 = alfImage(times_2, -1);
		        }
		        if(devide_2==null){
		        	devide_2 = Image.createImage("/devi2.PNG");
		        	devide_2 = scaleImage(devide_2,
		        			             (int)(devide_2.getWidth()*scale_x),
                                          (int)(devide_2.getHeight()*scale_y));   //缩放
                    devide_2 = alfImage(devide_2, -1);
		        }
			}break;
			case game_Pause:
				break;
			case game_Over:
				break;
			case game_Menu:
				if(menuback_img==null){
				    menuback_img = Image.createImage("/back.png");
				    menuback_img = scaleImage(menuback_img, screenW, screenH);      //缩放
				}
				if(title_img==null){
					title_img = Image.createImage("/title.png");
					title_img = scaleImage(title_img, (int)(title_img.getWidth()*scale_x),
							               (int)(title_img.getHeight()*scale_y));
					title_img = alfImage(title_img, -1);
				}
				break;
			case game_Setting:
				break;
			case game_Record:
				if(topscore_img==null){
				    topscore_img = Image.createImage("/topscore.PNG");
				    topscore_img = scaleImage(topscore_img, screenW, screenH);      //缩放
				}
				break;
			default:
				break;
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
    
	/*********************************************************************/
	/*                         游戏属性初始化                                   */
	/*********************************************************************/
	void initGame(){
		switch(GameState){
		case game_Menu:{
			level = 1;
			n = screenW/16;
			row = screenH/8;
			start = 0;
		}break;
		case game_Start:{
			game_time = 120;
			done = false;
			got = 0;
			miss = 0;
			LevelUp = false;
			lx = -screenW/2;
	        rx = screenW;
			if(level==1||level>3){
				score = 0;
				speed = 6;
			}
			if(level==1){
		        game_sp = 6;  //默认游戏速度
		        job = 5;
		        mouse.changeSequence(ShrewMouse.act1);
			}else if(level==2){
				game_sp = 5;
				job = 4;
				speed = 5;
				mouse.changeSequence(ShrewMouse.act2);
				//开启其他属性
			}else if(level==3){
			    game_sp = 4;
				job = 2;
				speed = 3;
				mouse.changeSequence(ShrewMouse.act2);
				//开启其他属性
			}
			initSound();    //声音资源初始化
		}break;
		case game_Setting:
			break;
		case game_Record:
			break;
		case game_About:
			break;
		case game_Quit:
			break;
		default:
			System.out.println("ERROR");
		    break;
		}
	}
	
	/*********************************************************************/
	/*                         声音资源初始化                                   */
	/*********************************************************************/
	private void initSound() {
		if(p1==null)
		    p1 = new AudioPlayer("/e0.mid");
		if(p2==null)
		    p2 = new AudioPlayer("/e1.mid");
		if(p3==null)
		    p3 = new AudioPlayer("/e2.mid");
	}
	
	/*********************************************************************/
	/*                          绘制游戏界面                                    */
	/*********************************************************************/
	protected void paint(Graphics g) {
		/* 清屏 */
		g.setColor(0x000000);
		g.fillRect(0, 0, screenW, screenH);
        /*绘制离屏屏幕*/
		render();
        g.drawImage(offScreenBuffer, 0, 0, 20);
	}
    
	/*********************************************************************/
	/*                          绘制离屏屏幕                                    */
	/*********************************************************************/
	private void render() {
		bg.setClip(0, 0, screenW, screenH);
		switch(GameState){
		case game_Menu:{
			/******************/
			/*    游戏主菜单    */
			/*****************/
			int x,y;
			int border = screenH/40;
			int color;
			String title[] = {
				"新游戏","声  音","排行榜","帮  助","退  出"	
			};
			bg.drawImage(menuback_img, 0, 0, 20);  //主菜单背景
			bg.drawImage(title_img, screenW/2-title_img.getWidth()/2, screenH/15, 20); //标题
			Font f = Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_LARGE);
			for(int i=0; i<title.length; i++){
				x = (screenW-f.stringWidth(title[i]))/2;  //居中
			    y = screenH/4+(f.getHeight()+border)*i;
			    if(menu_index==i)
			    	color = 255|(255<<8)|(151<<16);
			    else
			    	color = 109|(146<<8)|(219<<16);
			    drawSTR(title[i], f, color, x, y, bg);
			}
		}break;
		case game_Start:{  //游戏界面
			//绘制地图
			bg.drawImage(gamemap_img, 0, 0, Graphics.LEFT|Graphics.TOP);
			//绘制地鼠
			mouse.paint(bg);
			//画星星
			drawStart(bg);
			//绘制锤子
			drawSNK(bg);
			/******************/
			/*     游戏得分     */
			/*****************/