import java.awt.*;

import java.applet.*;
// copyright, M Paez, 1999, U of Antioquia, r Landau OSU
public class Sierpin extends Applet {



  public void Sierplot(Graphics g)

  {

    int i,max;

    double x, y, r;

    double a1,a2,a3,b1,b2,b3;

    max=20000;

    a1=20;

    b1=360;

    a2=320;

    b2=360;

    a3=170;

    b3=100;

    x = 180.;                            /* starting point */

    y = 150.;

    setBackground(Color.black);

    g.setColor(Color.yellow);

    for(i=1 ; i<=max ; i++)              /*  draw the gasket  */

    {

      r  = Math.random();

      if (r <= 0.3333)

      {

         x = 0.5*(x + a1);

         y = 0.5*(y + b1);

      }

      else if(r > 0.3333 && r <= 0.6666)

      {

         x = 0.5*(x + a2);

         y = 0.5*(y + b2);

      }   

      else 

      {

         x = 0.5*(x + a3);

         y = 0.5*(y + b3);

      }

      g.drawLine((int)x,(int)y,(int)x,(int)y);

   }

  }

   public void paint(Graphics g)

   {

     Sierplot(g);

   }

}