Graphics objGraphics;//建立画板对象
   Bitmap objBitMap = new Bitmap(600,300);//建立位图对象
   objGraphics = Graphics.FromImage(objBitMap);//根据位图对象建立画板对象
   objGraphics.Clear(Color.White);//设置画板对象的背景色
   int[] arrValues={0,0,0,0,0,0};//数据数组
   arrValues[0]=50;
   arrValues[1]=70;
   arrValues[2]=90;
   arrValues[3]=100;
   arrValues[4]=140;
   arrValues[5]=220;
   string[] arrValueNames={"0","0","0","0","0","0"};//月份

   arrValueNames[0] = "一月";
   arrValueNames[1]="二月";
   arrValueNames[2] = "三月";
   arrValueNames[3]="四月";
   arrValueNames[4]="五月";
   arrValueNames[5]="六月";

   objGraphics.DrawString("上半年销售情况统计",new Font("宋体",16),Brushes.Black,new PointF(0,0));

   //创建图例文字
   PointF symbolLeg = new PointF(335,20);
   PointF descLeg = new PointF(360,16);

   //画出图例。利用objGraphics图形对象的三个方法画出图例：
            //FillRectangle()方法画出填充矩形，DrawRectangle()方法画出矩形的边框，
            //DrawString()方法画出说明文字。这三个图形对象的方法在 .NET 框架类库类库中均已重载，
            //可以很方便根据不同的参数来画出图形。

   for(int i=0;i<arrValueNames.Length;i++)//画出各个月的标示图形
   {
    objGraphics.FillRectangle(new SolidBrush(GetColor(i)),symbolLeg.X,symbolLeg.Y,20,10);

    objGraphics.DrawRectangle(Pens.Black,symbolLeg.X,symbolLeg.Y,20,10);

    objGraphics.DrawString(arrValueNames[i].ToString(),new Font("宋体",10),Brushes.Black,descLeg);

    symbolLeg.Y += 15;
    descLeg.Y += 15;
   }

   for(int j = 0;j<arrValues.Length;j++)//画矩形图
   {
    objGraphics.FillRectangle(new SolidBrush(GetColor(j)),(j*35)+15,200-arrValues[j],20,arrValues[j]+5);
    objGraphics.DrawRectangle(Pens.Black,(j*35)+15,200-arrValues[j],20,arrValues[j]+5);
   }

   float sglCurrentAngle;
   float sglTotalAngle=0;

   for(int a=0;a<arrValues.Length-1;a++)
   {
    sglTotalAngle += arrValues[a];//取得数据总量
   }

   for(int b=0;b<arrValues.Length;b++)
   {
    sglCurrentAngle = arrValues[b]/sglTotalAngle*360;//求出该数据所占总数据的百分比
    objGraphics.FillPie(new SolidBrush(GetColor(b)),220,95,100,100,sglTotalAngle,sglCurrentAngle);//画出椭圆
    sglTotalAngle+=sglCurrentAngle;
   }

   objBitMap.Save(Response.OutputStream,ImageFormat.Gif);//该位图对象以"GIF"格式输出

  }

  private Color GetColor(int itemIndex)
  {
   Color objColor = new Color();
   switch(itemIndex)
   {
    case 0:
     objColor = Color.Blue;
     break;
    case 1:
     objColor = Color.Yellow;
     break;
    case 2:
     objColor = Color.Red;
     break;
    case 3:
     objColor = Color.Orange;
     break;
    case 4:
     objColor = Color.Purple;
     break;
    case 5:
     objColor = Color.Brown;
     break;
    case 6:
    
    default:
     objColor = Color.Blue;
     break;
   }

   return objColor;