public static Point GetNewPointWithDistance(Point vertex, Point old, int newDistance)
        {
            double oldDistance = Math.Sqrt((vertex.X - old.X) * (vertex.X - old.X) + (vertex.Y - old.Y) * (vertex.Y - old.Y));
            double sina = Math.Abs(vertex.Y - old.Y) / oldDistance;
            double cosa = Math.Abs(vertex.X - old.X) / oldDistance;

            return new Point((int)Math.Round(vertex.X - newDistance * cosa), (int)Math.Round(vertex.Y - newDistance * sina));
        }