maincanvas.java

J2ME编程的50个例子,适合掌上系统的编程

package demo;
import java.util.Random;

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

public class MainCanvas extends GameCanvas implements Runnable{
	public static final int GAME_UI		= 0;	//进入用户界面
	public static final int GAME_GAMING	= 1;	//进行游戏
	public static final int GAME_END		= 2;	//游戏结束
	public static final int GAME_STATE_NUM = 3;	//状态总数
	private int m_nState	= GAME_UI;			//存储当前的游戏状态
	
	private boolean	m_bRunning;			//控制线程运行
	private MyUI m_UI;						//用户界面对象
	private HammerSprite m_Hammer;			//锤子对象
	private Hole m_Hole[];					//洞穴对象数组
	private MyRecord m_Record;				//记录对象
	private int m_nTime = 6000;			//游戏时间
	public MainCanvas(){
		super(true);
		m_UI = new MyUI();
		m_Record = new MyRecord("MouseRecord");
		try{
			//读取锤子精灵图像
			Image img = Image.createImage("/demo/hammer.png");
			m_Hammer = new HammerSprite( img, 42, 40 );
			
			//创建洞穴及洞穴中的地鼠
			Image imgMouse = Image.createImage("/demo/mouse.png");
			Image imgHole = Image.createImage("/demo/hole.png");
			int x = getWidth()/2;
			int y = getHeight()/2;
			m_Hole = new Hole[4];
			Random rand = new Random();
			m_Hole[0] = new Hole( imgHole, imgMouse, rand, x, y - 50 );
			m_Hole[1] = new Hole( imgHole, imgMouse, rand, x + 50, y );
			m_Hole[2] = new Hole( imgHole, imgMouse, rand, x, y + 50 );
			m_Hole[3] = new Hole( imgHole, imgMouse, rand, x - 50, y );
		}
		catch (Exception ex){}
		setState( GAME_UI );
		Start();								//启动线程
	}
	private void setState( int state ){		//设置当前的游戏状态
		if( state < 0 || state >= GAME_STATE_NUM )
			return;
		m_nState = state;
	}
	public void Start(){
		m_bRunning = true;
		Thread thread = new Thread(this);		//分配新线程
		thread.start();							//线程启动
	}
	public void run() {						//新线程自动调用此方法
		//获取系统当前时间，并将时间换算成以毫秒为单位的数
		long T1 = System.currentTimeMillis();
		long T2 = T1;
		while(m_bRunning){
			T2 = System.currentTimeMillis();
			if( T2 - T1 > 100 ){			    //间隔100毫秒
				T1 = T2;
				Input();
				Logic();
				Paint();
			}
		}
	}
	public void Stop(){						//终止游戏
		m_bRunning = false;
	}
	public void Input(){
		int keyStates = getKeyStates();
		switch( m_nState ){
		case GAME_UI:							//进入用户界面
			m_UI.Input( keyStates );
			if( m_UI.getState() == MyUI.UI_HIDE )
				setState(GAME_GAMING);
			break;			
		case GAME_GAMING:						//进入游戏
			if( ( keyStates & GameCanvas.UP_PRESSED ) != 0 )
				m_Hole[0].HammerDown( m_Hammer );
			else if( ( keyStates & GameCanvas.RIGHT_PRESSED ) != 0 )
				m_Hole[1].HammerDown( m_Hammer );
			else if( ( keyStates & GameCanvas.DOWN_PRESSED ) != 0 )
				m_Hole[2].HammerDown( m_Hammer );
			else if( ( keyStates & GameCanvas.LEFT_PRESSED ) != 0 )
				m_Hole[3].HammerDown( m_Hammer );
			break;
		case GAME_END:							//游戏结束
			break;
		}
	}
	public void Logic(){
		switch( m_nState ){
		case GAME_UI:
			break;			
		case GAME_GAMING:
			m_Hammer.Logic();
			for( int n = 0; n < m_Hole.length; n ++ ){
				if( m_Hole[n].Logic( m_Hammer ) == true ){
					//如果有地鼠被打中，则增加积分
					int r = m_Record.getCurRecord();
					r = r + 1;
					m_Record.setCurRecord(r);
				}
			}
			m_nTime --;
			if( m_nTime <= 0 )
				setState(GAME_END);
			break;
		case GAME_END:
			break;
		}
	}
	public void Paint(){
		Graphics g = getGraphics();
		//用黑色清屏
		g.setColor(0xFF00FF00);
		g.fillRect(0, 0, getWidth(), getHeight());
		
		g.setColor(0xFF0000FF);
		switch( m_nState ){
		case GAME_UI:				//显示界面
			m_UI.Paint(g, getWidth(), getHeight());
			break;			
		case GAME_GAMING:			//显示游戏画面
			for( int n = 0; n < m_Hole.length; n ++ ){
				m_Hole[n].Paint(g);
			}
			m_Hammer.paint(g);
			//显示文字信息
			StringBuffer buffer = new StringBuffer();
			buffer.append("Time:");
			buffer.append(m_nTime/10);
			buffer.append("     Score:");
			buffer.append(m_Record.getCurRecord());
			g.drawString(buffer.toString(), 10, 10, 0);
			break;
		case GAME_END:				//游戏结束
			//显示本次得分及最高分记录
			m_Record.Paint(g, getWidth(), getHeight());
			break;
		}
		flushGraphics();
	}
}