maincanvas.java

这是一个赛车游戏的小代码

import java.io.IOException;
import java.io.InputStream;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.LayerManager;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;

public class MainCanvas extends GameCanvas
			implements Runnable,CommandListener{
	private LayerManager m_Manager;
	private Actor m_Actor;
	private Npc m_Npc;
	private Scene m_Scene;
	private boolean m_bGameEnd = false;
	private Command CommandExit;
	private MMRpgMidlet m_Midlet;
	private Player m_Player;////////////
	private MyUI m_UI;
	protected MainCanvas(MMRpgMidlet mMidlet) {
		super(true);
		m_Midlet = mMidlet;
		m_UI = new MyUI( getWidth(), getHeight() );		
		Thread t = new Thread(this);
		t.start();
	}
	public void run() {
		long lTime1 = System.currentTimeMillis();
		long lTime2 = lTime1;
		try{
			while(true){
				lTime2 = System.currentTimeMillis();;
				if( lTime2 - lTime1 > 50 ){
					lTime1 = lTime2;
					Input();
					Logic();
					Paint();
				}
			}
		}
		catch(Exception e){}
	}
	public void Start(){
		m_UI = null;
		try{
			Image image = Image.createImage("/MM.png");
			m_Actor = new Actor( image, 16, 32 );
			m_Actor.defineCollisionRectangle( 0, 16, 16, 16 );
			m_Actor.defineReferencePixel( 8, 24 );
			image = Image.createImage("/NPC.png");
			m_Npc = new Npc( image, 16, 32 );
			m_Npc.defineCollisionRectangle( 0, 16, 16, 16 );
			m_Npc.defineReferencePixel( 8, 24 );
		}
		catch (IOException e){}
		m_Scene = new Scene();
		m_Manager = new LayerManager();
		m_Manager.append( m_Actor );
		m_Manager.append( m_Npc );
		m_Scene.AppendToManager( m_Manager );

		m_Scene.EnterScene( 0, m_Actor, m_Npc );
		
		SetViewWindow();
		PlayWav();
		CommandExit = new Command("退出", Command.EXIT, 0);
		addCommand(CommandExit);
	    setCommandListener(this);
	}
	public void Input()
	{
		int keyStates = getKeyStates();
		if( m_UI != null ){
			if( m_UI.Input( keyStates ) == true ){
				Start();
			}
			return;
		}
		if( m_bGameEnd  )
			return;
				
		if( m_Npc.m_bDialog )
			return;
		
		if( !m_Actor.Input( keyStates ) )
			return;
		
		if( m_Scene.m_nCurIndex == 0 && 
			m_Actor.getRefPixelX() > 250 && 
			m_Actor.getRefPixelY() > 250 ){
			m_bGameEnd = true;
			return;
		}
		CheckCollisions();
		SetViewWindow();
	}
	private void SetViewWindow(){
		int nX = m_Actor.getRefPixelX() - getWidth()/2;
		int nY = m_Actor.getRefPixelY() - getHeight()/2;
		if( nX < 0 )
			nX = 0;
		else if( nX > m_Scene.GetWidth() - getWidth() )
			nX = m_Scene.GetWidth() - getWidth();
		if( nY < 0 )
			nY = 0;
		else if( nY > m_Scene.GetHeight() - getHeight() )
			nY = m_Scene.GetHeight() - getHeight();
		
		m_Manager.setViewWindow( nX, nY, getWidth(), getHeight() );
	}
	private void Logic(){
		if( m_UI != null ){
			return;
		}
		m_Npc.Logic();
	}
	private void Paint(){
		Graphics g = getGraphics();
		g.setColor( 0 );
		g.fillRect( 0, 0, getWidth(), getHeight() );
		if( m_UI != null ){
			m_UI.Paint( g );
			flushGraphics();
			return;
		}
		m_Manager.paint( g, 0, 0 );
		if( m_Npc.m_bDialog )
			m_Npc.DrawText( g, getWidth(), getHeight() );
		if( m_bGameEnd ){
			g.setColor( 0xffffff );
			g.drawString( "MM终于走出了洞穴！", getWidth()/ 2, 
				getHeight() / 2, Graphics.TOP|Graphics.HCENTER );
		}
		flushGraphics();
	}
	public void PlayWav(){
		try{
			InputStream is = this.getClass().getResourceAsStream("/Back.wav");
			m_Player = Manager.createPlayer(is,"audio/x-wav");
			m_Player.setLoopCount( -1 );
			m_Player.start();
		}
		catch(Exception e){}
	}
	public void CheckCollisions(){
		if( m_Actor.collidesWith( m_Npc, false ) ){
			m_Actor.MoveBack();
			m_Npc.DialogStart();
			return;
		}
		m_Scene.CollidesWidth( m_Actor, m_Npc );
	}
	

	public void commandAction(Command arg0, Displayable arg1) {
		if (arg0.getCommandType() == Command.EXIT) {
			m_Midlet.notifyDestroyed();
	    }
	}

}