myplane.java

用J2ME开发的射击游戏

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

public class MyPlane extends PlaneSprite{
	MyPlane( Image img, int nWidth, int nHeight ){
		super( img, nWidth, nHeight );
		m_nSpeedY = 2;
		m_nSpeedX = 2;
	}
	public void Input( int keyStates ){
		if( isVisible() == false )
			return;
		int nX = getRefPixelX();
		int nY = getRefPixelY();
		if( ( keyStates & GameCanvas.UP_PRESSED ) != 0 )
			nY -= m_nSpeedY;        		
        if( ( keyStates & GameCanvas.LEFT_PRESSED ) != 0 )
        	nX -= m_nSpeedX;
        if( ( keyStates & GameCanvas.RIGHT_PRESSED ) != 0 )
        	nX += m_nSpeedX;  
        if( ( keyStates & GameCanvas.DOWN_PRESSED ) != 0 )
        	nY += m_nSpeedY;        		
        if( ( keyStates & GameCanvas.FIRE_PRESSED ) != 0 )
        	CreateBullet();
		setRefPixelPosition( nX, nY );
	}
	public void Logic(){
		super.Logic();
	}
	private void CreateBullet(){
		if( m_Bullet.isVisible() )
			return;
		m_Bullet.setRefPixelPosition( 
					getRefPixelX(), getRefPixelY() );
		m_Bullet.SetSpeed( 0, -3 );
		m_Bullet.setVisible(true);
	}
}