import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;

import javax.swing.ImageIcon;
import javax.swing.JPanel;


public class Board4 extends JPanel implements Runnable {

    private Image star;
    private Thread animate;
    private int x, y;

    private final int Delay = 50;


    public Board4() {
        setBackground(Color.black);
        setDoubleBuffered(true);

        ImageIcon image = new ImageIcon(this.getClass().getResource("star.png"));
        star = image.getImage();
        x = y = 10;
    }

    public void addNotifty(){
        super.addNotify();
        animate = new Thread(this);
        animate.start();
    }

    public void paint(Graphics2D g){
        super.paint(g);

        Graphics2D g2d = (Graphics2D)g;
        g2d.drawImage(star, x, y, this);
        Toolkit.getDefaultToolkit().sync();
        g.dispose();
    }

    public void cycle(){
        x += 1;
        y += 1;

        if(y > 240){
            x = -45;
            y = -45;
        }
    }

    public void run(){

        long beforeTime, timeDiff, sleep;

        beforeTime = System.currentTimeMillis();

        while(true){

            cycle();
            repaint();

            timeDiff = System.currentTimeMillis() - beforeTime;
            sleep = Delay - timeDiff;

            if (sleep < 0)
                sleep = 2;

            try
            {
                Thread.sleep(sleep);
            }
            catch (InterruptedException e)
            {
                System.out.println("interrupted");
            }

            beforeTime = System.currentTimeMillis();
        }
    }
}