hammersprite.java

J2ME编程的50个例子,适合掌上系统的编程

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


public class HammerSprite extends Sprite{
	public static final int HAMMER_UP 	= 0;		//锤子被举起
	public static final int HAMMER_DOWN 	= 1;		//锤子落下
	public static final int HAMMER_HIDE 	= 2;		//锤子隐藏
	public static final int HAMMER_STATE_NUM 	= 3;	
	private int m_nState = HAMMER_HIDE;
	private int m_nTime = 0;			//控制各种状态的保持时间
	public HammerSprite( Image image, int frameWidth, int frameHeight){
		super(image, frameWidth, frameHeight);		
		defineReferencePixel(frameWidth / 2, frameHeight / 2);
		setVisible(false);
	}
	//获取当前的锤子状态
	public int getState(){
		return m_nState;
	}
	//设置当前的锤子状态
	public void setState( int state ){
		if( state < 0 || state >= HAMMER_STATE_NUM )
			return;
		m_nState = state;
		switch( m_nState ){
		case HAMMER_UP:
			setFrame( 0 );
			setVisible(true);
			m_nTime = 2;
			break;
		case HAMMER_DOWN:
			setFrame( 1 );
			setVisible(true);
			m_nTime = 2;
			break;
		case HAMMER_HIDE:
			setVisible(false);
			break;
		}
	}
	//逻辑操作，产生并控制锤子各种状态的动画
	public void Logic(){
		switch( m_nState ){
		case HAMMER_UP:
			m_nTime --;
			if( m_nTime < 0 )
				setState( HAMMER_DOWN );
			break;
		case HAMMER_DOWN:
			m_nTime --;
			if( m_nTime < 0 )
				setState( HAMMER_HIDE );
			break;
		case HAMMER_HIDE:
			break;
		}
	}

}