explosion.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 Explosion extends Sprite{
	public Explosion( Image image, int frameWidth, int frameHeight ){
		super(image, frameWidth, frameHeight);		
		defineReferencePixel(frameWidth / 2, frameHeight / 2);
		setVisible(false);
	}
	//开始显示爆炸，参数x、y分别是爆炸位置的横纵坐标
	public void Start( int x, int y ){
		setFrame(0);
		setPosition( x, y );
		setVisible(true);
	}
	//逻辑操作，产生爆炸动画
	public void Logic(){
		if( isVisible() == false )
			return;
		int n = getFrame();
		n ++;
		if( n >= getFrameSequenceLength() )
			setVisible(false);
		else
			setFrame(n);
	}
}