C# GDI+三角形与五角星绘制

            var g = pictureBox1.CreateGraphics();
            int r=200;
            Point pt0 = new Point(250, 250);
            PointF[] point = new PointF[3];
            for(int i=0; i< 3; i++)
            {
                point[i] = new PointF((float)(r * Math.Cos((i * 2 * Math.PI / 3) - Math.PI / 2) + pt0.X), (float)(r * Math.Sin(i * 2 * Math.PI / 3 - Math.PI / 2)) + pt0.Y);
            }
            g.FillPolygon(new SolidBrush(Color.Red), point);

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            var g = pictureBox1.CreateGraphics();
            int r = 200;
            Point pt0 = new Point(250, 250);
            PointF[] p