扇形统计图

Question

哪位大侠知道如何在扇形统计图的对应部分添加文字和百分比啊，类似下图http://image.baidu.com/i?ct=503316480&z=&tn=baiduimagedetail&word=%C9%C8%D0%CE%CD%B3%BC%C6%CD%BC&in=7460&cl=2&lm=-1&pn=0&rn=1&di=3942276330&ln=1904&fr=&fmq=&ic=0&s=0&se=1&sme=0&tab=&width=&height=&face=0&is=&istype=2#pn0&-1&di3942276330&objURLhttp%3A%2F%2F221.234.13.201%2Fczpd%2Fkczy%2Fxia%2Fsx%2F2%2F13%2Fhsd-kebiao%2F1%2Fjasl%2Fimage006.jpg&fromURLhttp%3A%2F%2F221.234.13.201%2Fczpd%2Fkczy%2Fxia%2Fsx%2F2%2F13%2Fhsd-kebiao%2F1%2Fjasl.htm&W245&H202，我已经将除了文字和百分比之外的部分画完了，不会添加文字

Answer 1

  using (SolidBrush br = new SolidBrush(Color.Red))
                {
                    e.Graphics.DrawString(
                        "This is a vertical text.",
                        this.Font, br, 450, 90);
                }

Answer 2

分析扇形的形状，动态计算drawstring 的位置。