public void RotatePolygon(Point current)
        {
            Point center = GetPolygonCenter();
            double angle = Math.Atan((double)(current.Y - center.Y) / (double)(current.X - center.X));
            List<Point> tmpVertexs = new List<Point>();
            foreach (Point p in Vertexs)
            {
                int tmpX = 0, tmpY = 0;
                tmpX = Math.Abs((int)((p.X - center.X) * Math.Cos(angle * Math.PI / 180) - (p.Y - center.Y) * Math.Sin(angle * Math.PI / 180)));
                tmpY = Math.Abs((int)((p.Y - center.Y) * Math.Cos(angle * Math.PI / 180) + (p.X - center.X) * Math.Sin(angle * Math.PI / 180)));
                tmpX += p.X - center.X;
                tmpY += p.Y - center.Y;
                tmpVertexs.Add(new Point(tmpX, tmpY));
            }

            Vertexs = tmpVertexs;
        }