Exploring Iterated Function Systems

spherical.java

@Override
public Point2D apply(Point2D src) {
  double ox = sw / 2d;
  double oy = sh / 2d;
  double u = Point2D.distance(0d, 0d, ox / 2d, oy / 2d);
  double r = Point2D.distance(ox, oy, src.getX(), src.getY()) / u;
  double scale = 1d / (r * r);
  double x = (src.getX() - ox) / u;
  double y = (src.getY() - oy) / u;

  double fx = ox + (u * scale * x);
  double fy = oy + (u * scale * y);

  return new Point2D.Double(fx, fy);
}