barsprite.java

J2ME的砖块游戏！！打砖块游戏！！！开发环境用wTK

package com.yang.c10.Brick;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;


public class BarSprite extends Sprite{
	private int m_nTime;				//取得武器后,停留的时间
	public BarSprite( Image image, int frameWidth, int frameHeight){
		super(image, frameWidth, frameHeight);		
		defineReferencePixel(frameWidth / 2, frameHeight / 2);
	}
	//设置木棒加长,参数blong为true,则设置成长型木棒,否则设置成普通木棒
	public void setLong( boolean blong ){		
		if( blong ){
			setFrame(1);
			m_nTime = 300;
		}
		else
			setFrame(0);
	}
	//根据玩家的输入,控制木棒的位置
	public void Input(int keyStates, int scrWidth ){
		int x = getRefPixelX();
		if( ( keyStates & GameCanvas.LEFT_PRESSED ) != 0 )
			x -= 5;
		if( ( keyStates & GameCanvas.RIGHT_PRESSED ) != 0 )
			x += 5;
		if( x < this.getWidth() / 2 )
			x = this.getWidth() / 2;
		if( x > scrWidth - this.getWidth() / 2 )
			x = scrWidth - this.getWidth() / 2;
		setRefPixelPosition(x, getRefPixelY());
	}
	//逻辑操作,如果木棒处于加长状态,则计算加长状态所能保持的时间
	public void Logic(){
		int n = getFrame();
		if( n == 1 ){
			m_nTime --;
			if( m_nTime < 0 )
				setLong( false );
		}
	}
}