maincanvas.java

J2ME编程的50个例子,适合掌上系统的编程

package demo;
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;						//界面对象
	private MyBack		m_Back;						//背景对象
	private BKQSprite 	m_BKQ;						//宠物对象
	private ButtonSprite m_Button;					//按钮对象
	public MainCanvas(){
		super(true);
		m_UI 	= new MyUI();
		m_Back	= new MyBack();
		try{
			//创建宠物
			Image img = Image.createImage("/demo/BKQ.png");
			m_BKQ = new BKQSprite(img,54,59);	
			m_BKQ.setAllPosition(getWidth()/2 - 30, getHeight() - 70 );
			//创建按钮
			Image imgBT = Image.createImage("/demo/button.png");
			m_Button = new ButtonSprite(imgBT, 46, 16);
		}
		catch (Exception ex){}
		Start();									//启动线程
	}
	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 > 200 ){			    	//间隔200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:
			m_UI.Input( keyStates );
			if( m_UI.getState() == MyUI.UI_HIDE )
				m_nState = GAME_GAMING;
			break;			
		case GAME_GAMING:
			switch( m_Button.Input(keyStates) )
			{//根据所按的按钮,设置精灵的状态
			case ButtonSprite.BUTTON_WALK:
				m_BKQ.setState(BKQSprite.BKQ_WALK);
				break;
			case ButtonSprite.BUTTON_TALK:
				m_BKQ.setState(BKQSprite.BKQ_TALK);
				break;
			case ButtonSprite.BUTTON_SLEEP:
				m_BKQ.setState(BKQSprite.BKQ_SLEEP);
				break;
			case ButtonSprite.BUTTON_MUSIC:
				m_BKQ.setState(BKQSprite.BKQ_MUSIC);
				break;
			}
			break;
		}
	}
	public void Logic(){
		switch( m_nState ){
		case GAME_UI:								//界面逻辑
			break;			
		case GAME_GAMING:							//精灵逻辑
			m_BKQ.Logic();
			if( m_BKQ.getState() == BKQSprite.BKQ_DEAD )
				m_nState = GAME_END;
		}
	}
	public void Paint(){
		Graphics g = getGraphics();
		//用黑色清屏
		g.setColor(0);
		g.fillRect( 0, 0, getWidth(), getHeight() );
		
		g.setColor(0x0000FF);
		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
			m_Back.Paint(g, getWidth(), getHeight());
			m_BKQ.PaintAll(g);
			m_Button.PaintAll(g, getWidth(), getHeight());
			break;
		case GAME_END:								//显示结束语
			g.drawString("小精灵死了!!!!", 
					getWidth()/2 - 10, getHeight()/2 - 10, 0);
			break;
		}
		flushGraphics();
	}
}