namespace 绘制立体饼图
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Graphics g = pictureBox1.CreateGraphics();  
      for (int i = 0; i < 30; i++)
          g.FillPie(Brushes.DarkRed, new Rectangle(100, 20 + i, 200,100), 100,100);
      g.FillPie(Brushes.Red, new Rectangle(100, 20,200, 100), 100, 100);
        }
    }
}