import java.awt.Color;
import java.awt.Graphics;

import javax.swing.*;

public class Snake extends JApplet implements Runnable{

    int x1 = 1, y1 = 0, x2 = 1, y2 = 0, x3 = 1, y3 = 0, x4 = 1, y4 = 0, x5 = 1, y5 = 0;
    boolean goRight = true, goDown = false, goLeft = false, goUp = false;

    public void init() {
        // TODO Auto-generated method stub
        super.init();
        x2 = x1 + 20;
        x3 = x2 + 20;
        x4 = x3 + 20;
        x5 = x4 + 20;
        Thread nitka = new Thread(this);
        nitka.start();
    }

    public void paint(Graphics g) {
        super.paintComponents(g);

        //Go right
        if(y5 <= 0) {
            y5 = 0;
            x5 += 5;
        }
        if(y4 <= 0) {
            y4 = 0;
            x4 += 5;
        }
        if(y3 <= 0) {
            y3 = 0;
            x3 += 5;
        }
        if(y2 <= 0) {
            y2 = 0;
            x2 += 5;
        }
        if(y1 <= 0) {
            y1 = 0;
            x1 += 5;
        }

        //Go down
        if(x5 >= getWidth() - 20) {
            x5 = getWidth() - 20;
            y5 += 5;
        }
        if(x4 >= getWidth() - 20) {
            x4 = getWidth() - 20;
            y4 += 5;
        }
        if(x3 >= getWidth() - 20) {
            x3 = getWidth() - 20;
            y3 += 5;
        }
        if(x2 >= getWidth() - 20) {
            x2 = getWidth() - 20;
            y2 += 5;
        }
        if(x1 >= getWidth() - 20) {
            x1 = getWidth() - 20;
            y1 += 5;
        }

        //Go left
        if(y5 >= getHeight() - 20) {
            y5 = getWidth() - 20;
            x5 -= 5;
        }
        if(y4 >= getWidth() - 20) {
            y4 = getWidth() - 20;
            x4 -= 5;
        }
        if(y3 >= getWidth() - 20) {
            y3 = getWidth() - 20;
            x3 -= 5;
        }
        if(y2 >= getWidth() - 20) {
            y2 = getWidth() - 20;
            x2 -= 5;
        }
        if(y1 >= getWidth() - 20) {
            y1 = getWidth() - 20;
            x1 -= 5;
        }

        //Go up
        if(x5 <= 0) {
            x5 = 0;
            y5 -= 5;
        }
        if(x4 <= 0) {
            x4 = 0;
            y4 -= 5;
        }
        if(x3 <= 0) {
            x3 = 0;
            y3 -= 5;
        }
        if(x2 <= 0) {
            x2 = 0;
            y2 -= 5;
        }
        if(x1 <= 0) {
            x1 = 0;
            y1 -= 5;
        }

        g.setColor(Color.blue);
        g.fillRect(x1, y1, 20, 20);
        g.fillRect(x2, y2, 20, 20);
        g.fillRect(x3, y3, 20, 20);
        g.fillRect(x4, y4, 20, 20);
        g.fillRect(x5, y5, 20, 20);
    }

    public void run() {
        // TODO Auto-generated method stub
        while(true){
            repaint();
            try {
                Thread.sleep(50);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}