playercar.java

来自「J2ME编程的50个例子,适合掌上系统的编程」· Java 代码 · 共 34 行

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


public class PlayerCar extends CarSprite{
	PlayerCar(Image image, int frameWidth, int frameHeight) {
		super(image, frameWidth, frameHeight);
		defineReferencePixel( frameWidth / 2, frameHeight / 2 );
		setFrame(0);
		m_nSpeedY = 0;
	}
	//处理按键的输入
	public void Input(int keyStates){
		if( ( keyStates & GameCanvas.UP_PRESSED ) != 0 )
		{//加速
			if( m_nSpeedY < 10 )
				m_nSpeedY ++;
		}
		else
		{//减速
			if( m_nSpeedY > 0 )
				m_nSpeedY --;
		}
		//左右移动赛车
		if( ( keyStates & GameCanvas.LEFT_PRESSED ) != 0 )
			m_nSpeedX = -3;
		else if( ( keyStates & GameCanvas.RIGHT_PRESSED ) != 0 )
			m_nSpeedX = 3;
		else
			m_nSpeedX = 0;
	}
}