public double Dist(HarrisPoint point)
 {
     return(Math.Sqrt(Math.Pow(X - point.X, 2) + Math.Pow(Y - point.Y, 2)));
 }
        public int CompareTo(object obj)
        {
            HarrisPoint p2 = (HarrisPoint)obj;

            return((int)(R - p2.R));
        }