scene.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.Image;
import javax.microedition.lcdui.game.LayerManager;
import javax.microedition.lcdui.game.TiledLayer;

public class Scene {
	public int m_nCurIndex;
	private TiledLayer m_LyPass;
	private TiledLayer m_LyNotPass;
	private TiledLayer m_LyJump;
	Scene( ){
		try{
			Image image = Image.createImage("/map.png");
			m_LyPass = new TiledLayer( 10, 10, image, 32, 32 );
			m_LyNotPass = new TiledLayer( 10, 10, image, 32, 32 );
			m_LyJump = new TiledLayer( 10, 10, image, 32, 32 );
		}catch (IOException e){}
	}
	public void AppendToManager( LayerManager mManager ){
		mManager.append( m_LyPass );
		mManager.append( m_LyNotPass );
		mManager.append( m_LyJump );
	}
	public void EnterScene( int nIndex, Actor mActor, Npc mNpc ){
		m_nCurIndex = nIndex;
		InputStream is = null;
		switch( nIndex )
		{
		case 0:
			is = getClass().getResourceAsStream("/map0.txt");
			mActor.setRefPixelPosition( 150, 150 );
			mNpc.setFrame( 0 );
			mNpc.SetText( "洞穴上层有个人知道出口！" );
			mNpc.setRefPixelPosition( 130, 120 );
			break;
		default:
			is = getClass().getResourceAsStream("/map1.txt");
			mActor.setRefPixelPosition( 200, 160 );
			mNpc.setFrame( 1 );
			mNpc.SetText( "洞穴出口在下层的右下角。" );
			mNpc.setRefPixelPosition( 150, 50 );
			break;
		}
		LoadScene( is );
	}
	public int GetWidth(){
		return m_LyPass.getWidth();
	}
	public int GetHeight(){
		return m_LyPass.getHeight();
	}
	public void CollidesWidth( Actor mActor, Npc mNpc ){
		if( mActor.collidesWith( m_LyJump, false ) )
		{
			mActor.MoveBack();
			if( m_nCurIndex == 0 )
				EnterScene( 1, mActor, mNpc );
			else
				EnterScene( 0, mActor, mNpc );
		}
		else if( mActor.collidesWith( m_LyNotPass, false ) )
		{
			mActor.MoveBack();
		}
	}
	private void LoadScene( InputStream is ){
		try{
			int ch = -1;
			for( int nRow = 0; nRow < 10; nRow ++ )
			{
				for( int nCol = 0; nCol < 10; nCol ++ )
				{
					ch = -1;
					while( ( ch < 0 || ch > 7 ) )
					{
						ch = is.read();
						if( ch == -1 )
							return;
						ch = ch - '0';
					}
					if( ch == 4 || ch == 5 )
					{
						m_LyPass.setCell( nCol, nRow, 0 );
						m_LyNotPass.setCell( nCol, nRow, ch );
						m_LyJump.setCell( nCol, nRow, 0 );
					}
					else if( ch == 6 || ch == 7 )
					{
						m_LyPass.setCell( nCol, nRow, 0 );
						m_LyNotPass.setCell( nCol, nRow, 0 );
						m_LyJump.setCell( nCol, nRow, ch );
					}
					else
					{
						m_LyPass.setCell( nCol, nRow, ch );
						m_LyNotPass.setCell( nCol, nRow, 0 );
						m_LyJump.setCell( nCol, nRow, 0 );
					}
				}
			}	
		}
		catch (IOException e){}	
	}
}