public bool PtInPoly(PointF[] Points, float X, float Y)
    {
        bool Result = false;
        int Count = Points.Length;
        int j = Count - 1;
        for (int K = 0; K < Count; K++)
        {
            if (((Points[K].Y <= Y) &&
            (Y < Points[j].Y)) | (
            (Points[j].Y <= Y) &&
            (Y < Points[K].Y)))
            {
                if (X < (Points[j].X - Points[K].X) * (Y - Points[K].Y) / (Points[j].Y - Points[K].Y) + Points[K].X)
                    Result = !(Result);
            }
            j = K;
        }
        return Result;
    }