xmodtest.java

用JAVA编写的建议的XORMOD双缓冲示例

import java.applet.*;
import java.awt.*;
public class XModTest extends Applet implements Runnable 
{
	private Thread MoveBall=new Thread(this);
	private int x=0,direction=0;
	private Image img;
	public void init()
	{
		img=createImage(getSize().width,getSize().height);
	}
	public void start()
	{
		setBackground(new Color(150,200,200));
		setForeground(Color.pink);
		MoveBall.start();
	}
	

	public void run()
	{
		while(true)
		{
			if(x>=getSize().width-50)
			{
				direction=1;
				
			}
			
			if(x<=0)
			{
				direction=0;
				
			}
			if(direction==0)
				x++;
			else
				x--;
			repaint();
			try
			{
				Thread.sleep(20);
			}
			catch(Exception e){}
		}
	}
	public void paint(Graphics g)
	{
		g.setXORMode(getBackground());
		g.fillRect((int)((getSize().width-200)/2),(int)(getSize().height-200)/2,200,200);
		g.fillOval(x,100,50,50);
	}
	public void stop()
	{
		MoveBall.stop();
		MoveBall=null;
	}
	public void update(Graphics g)
	{
		Graphics offScreen=img.getGraphics();
		offScreen.setColor(getBackground());
		offScreen.fillRect(0,0,getSize().width,getSize().height);
		offScreen.setColor(g.getColor());
		paint(offScreen);
		g.drawImage(img,0,0,this);
	}

	
}