C#画图之饼图

        public JsonResult DrawPie()
        {
            // 预置颜色
            List<Color> colors = new List<Color>()
            {
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,),
                Color.FromArgb(,,)
            };

            #region 允许配置项

            //定义宽高  只定义宽度即可
            int height = , width = height;

            //边缘位置留白
            int margin_top = ;
            int margin_right = ;
            int margin_bottom = ;
            int margin_left = ;

            //文字大小，单位：px
            int fontsize = ;

            // 扇区名称预留的位置  颜色框20，与文字间隙5，文字80，距离折线图10，需要包含边缘留白
            int lineNameWidth =  - margin_right;

            #endregion

            #region 数据

            //最大数量/总数量
            int totalCount = ;

            string[] pieNameData = new string[] { "第一个", "第二个", "第三个", "第四个", "第五个" };
            int[] pieData = new int[] { , , , ,  };

            totalCount = pieData.Sum();

            #endregion

            //单位转换对象
            Spire.Pdf.Graphics.PdfUnitConvertor unitCvtr = new Spire.Pdf.Graphics.PdfUnitConvertor();

            //生成图像对象
            Bitmap image = new Bitmap(width + margin_left + margin_right + lineNameWidth, height + margin_top + margin_bottom);

            //创建画布
            Graphics g = Graphics.FromImage(image);
            //消除锯齿
            g.SmoothingMode = SmoothingMode.AntiAlias;
            //质量
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.CompositingQuality = CompositingQuality.HighQuality;

            //黑色画笔--文字颜色
            Brush blackBrush = new SolidBrush(Color.FromArgb(, , , ));
            Pen blackPen = new Pen(blackBrush, );

            //填充区域内容--背景
            g.FillRectangle(Brushes.WhiteSmoke, , , width + margin_left + margin_right + lineNameWidth, height + margin_top + margin_bottom);

            //文字样式
            Font font = new Font("宋体", unitCvtr.ConvertUnits(fontsize, Spire.Pdf.Graphics.PdfGraphicsUnit.Pixel, Spire.Pdf.Graphics.PdfGraphicsUnit.Point));

            float tempAngle = ;

            for (int i = ; i < pieData.Length; i++)
            {
                Color tempColor = colors[i];

                //文字内容
                StringFormat format = new StringFormat();
                //format.Alignment = StringAlignment.Far; //居中
                //format.FormatFlags = StringFormatFlags.DirectionVertical;

                //画笔
                SolidBrush brush = new SolidBrush(tempColor);
                Pen pen = new Pen(brush, );

                // 折线名称处理
                // 颜色块
                Rectangle rectangle = new Rectangle(margin_left + width + , margin_top + i * , , );
                g.FillRectangle(brush, rectangle);

                // 文字
                RectangleF txtRec = new RectangleF(margin_left + width +  + , margin_top + i *  + , , );

                string txt = pieNameData[i].ToString() + "(" + Math.Round((pieData[i] / Convert.ToDouble(totalCount) * ), ).ToString() + "%)";
                g.DrawString(txt, font, blackBrush, txtRec, format);

                /************************
                 * 开始画饼图
                 ************************/
                //饼图
                int radius = (height > width ? width : height);

                Rectangle rec = new Rectangle(margin_left, margin_top, radius, radius);

                if (i < pieData.Length - )
                {
                    float angle = Convert.ToInt32(pieData[i] / Convert.ToDouble(totalCount) * );

                    g.FillPie(brush, rec, tempAngle, angle);

                    tempAngle += angle;
                }
                else
                {
                    //防止计算误差导致不足360或者超过360
                    float angle =  - tempAngle;

                    g.FillPie(brush, rec, tempAngle, angle);
                }
            }

            string relativePath = @"\draw-image\" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".jpg";
            string path = Server.MapPath(relativePath);
            image.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);

            //return relativePath;
            return Json(relativePath, JsonRequestBehavior.AllowGet);
        }

示例图

那种带把，把的末尾带文字的图，不会算啊，哪个会算的，有幸看到了能不能告诉我怎么算啊，跪谢！！！

带把的饼图（不会算的饼图）如下：