C# 生成一个带数字的饼图

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;

namespace Image.Util
{
    class ShapeImage
    {
        /// <summary>
        /// 画一个带数字的饼图
        /// </summary>
        /// <param name="digit"></param>
        /// <param name="color"></param>
        /// <returns></returns>
       public static Bitmap GetPieWithDigit(int digit,Color color)
        {
            int size = 16;
            if ((digit < 0) || (digit > 99)) throw new Exception("数值超范围");
            Bitmap bmp = new Bitmap(size, size);
            Graphics g = Graphics.FromImage(bmp);
            g.SmoothingMode = SmoothingMode.AntiAlias;  //使绘图质量最高，即消除锯齿
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.FillPie(new SolidBrush(color), new Rectangle(0, 0, size-1, size-1), 0, 360);
            Point centerPoint = new Point(size / 4, size / 4);
            StringFormat stringFormat = new StringFormat();
            stringFormat.Alignment = StringAlignment.Center;
            if (digit.ToString().Length == 2)
            {
                g.DrawString(digit.ToString(), new Font("微软雅黑", 9), new SolidBrush(Color.White), new Rectangle(0, 0, size, size), stringFormat);
            }
            else
                g.DrawString(digit.ToString(), new Font("微软雅黑", 9), new SolidBrush(Color.White), new Rectangle(0, 0, size, size), stringFormat);
            
                
            return bmp;
        }
       
    }
}