如何样画有立体效果的矩形

怎么样画有立体效果的矩形？
rt

[解决办法]

C# code

        private void button1_Click(object sender, EventArgs e)        {            Graphics g = this.CreateGraphics();            using(Pen pen = new Pen(new SolidBrush(Color.Red), 1))            {                Point p1 = new Point(0, 0);//  p1 ----------------p2                Point p2 = new Point(30, 0);//   |\               \                Point p3 = new Point(10, 30);//p7| p2---------------p4                Point p4 = new Point(40, 30);//   \|               |                Point p5 = new Point(10, 80);//    |               |p6                Point p6 = new Point(40, 80);//  p5 ----------------                Point p7 = new Point(0, 80 - 30);//p5的高度-p3的高度                g.DrawLine(pen, p1, p2);                g.DrawLine(pen, p3, p4);                g.DrawLine(pen, p1, p3);                g.DrawLine(pen, p2, p4);                g.DrawLine(pen, p3, p5);                g.DrawLine(pen, p4, p6);                g.DrawLine(pen, p5, p6);                g.DrawLine(pen, p1, p7);                g.DrawLine(pen, p7, p5);            }        }