import java.awt.Graphics;

public class c06_fern extends java.applet.Applet {
  static final int imax = 10000;
  static final int left = 30;
  static final int w = 300;
  static final int wl = w + left;

  static final double e1 = 0.5 * w;
  static final double e2 = 0.57 * w;
  static final double e3 = 0.408 * w;
  static final double e4 = 0.1075 * w;
  static final double f1 = 0 * w;
  static final double f2 = -0.036 * w;
  static final double f3 = 0.0893 * w;
  static final double f4 = 0.27 * w;

  public void paint(Graphics g)
  {
    LineTo lt = new LineTo(g);
    double x = e1;
    double y = 0;
    for (int i = 0; i < imax; i++) {
      double r = Math.random();
      double xn, yn;
      if (r < 0.02) {
        xn = 0 * x + 0 * y + e1;
        yn = 0 * x + 0.27 * y + f1;
      } else if (r < 0.17) {
        xn = -0.139 * x + 0.263 * y + e2;
        yn = 0.246 * x + 0.224 * y + f2;
      } else if (r < 0.3) {
        xn = 0.17 * x - 0.215 * y + e3;
        yn = 0.222 * x + 0.176 * y + f3;
      } else {
        xn = 0.781 * x + 0.034 * y + e4;
        yn = -0.032 * x + 0.739 * y + f4;
      }
      lt.setPixel(left+(int)xn, wl-(int)yn);
      x = xn;
      y = yn;
    }
  }
}