import java.awt.*;

import java.applet.*;
// copyright, M Paez, 1999, U of Antioquia, r Landau OSU


public class Fern extends Applet {

  double mxx,myy,bxx,byy;



  public void Fernplot(Graphics g)

  {

     int i;

     double x, y, xn, yn, r;

     int pex,pey;

     int max, seed;

     max=15000;

     seed=68111;

     x=0.5;                         /* starting point */

     y=0.0;

     coormundo(0.0,1.0,1.0,-0.5);

     setBackground(Color.black);

     g.setColor(Color.green);

     for(i=1; i<=max; i++)                /* iterations */

     {

        r=Math.random();

        if (r <= 0.02)                    /* case 1 */

        {

           xn = 0.5;

           yn = 0.27*y;

        }

        else if((r>0.02) && (r<=0.17))    /* case 2 */

        {

          xn = -0.139*x + 0.263*y + 0.57;

          yn =  0.246*x + 0.224*y - 0.036;

        }

        else if ((r>0.17) && (r<=0.3))    /* case 3 */

        {

          xn = 0.17*x  - 0.215*y + 0.408;

          yn = 0.222*x + 0.176*y + 0.0893;

        }

        else                              /* case 4 */

        {

          xn = 0.781*x + 0.034*y + 0.1075;

          yn = -0.032*x + 0.739*y + 0.27;

        }

        x=xn;

        y=yn;

        pex=(int)(mxx*x+bxx);

        pey=(int)(myy*y+byy);

        g.drawLine(pex,pey,pex,pey);

     }

  }

   void coormundo(double xiz,double ysu,double xde,double yinf)

  {

    double maxx,maxy,xxfin,xxcom,yyin,yysu;

    maxx=600;

    maxy=450;

    xxcom=0.15*maxx;

    xxfin=0.75*maxx;

    yyin=0.8*maxy;

    yysu=0.2*maxy;

    mxx=(xxfin-xxcom)/(xde-xiz);

    bxx=0.5*(xxcom+xxfin-mxx*(xiz+xde));

    myy=(yyin-yysu)/(yinf-ysu);

    byy=0.5*(yysu+yyin-myy*(yinf+ysu));

  }

  public void paint(Graphics g)

  {

    Fernplot(g);

    showStatus("Done");

  }

}