for (i = 0; i < arrValues.Length; i++)

                {

                     graphics.FillRectangle(new SolidBrush(GetColor(i)),(i*35) + 15,200 - arrValues[i],20,arrValues[i]);

                     graphics.DrawRectangle(Pens.Black,(i*35) + 15,200 - arrValues[i],20,arrValues[i]);

                }

           }

           /// <summary>

           /// 在畫佈上面繪製圓餅形

           /// </summary>

           private void Draw_Pie()

           {

                int i;

                // currentangle代表當前角度 totalangle代表最大角度 totalvalues代表最大的銷售額

                float sglCurrentAngle = 0,sglTotalAngle = 0,sglTotalValues = 0;

                // 計算最大銷售額

                for (i = 0; i < arrValues.Length; i++)

                     sglTotalValues += arrValues[i];

                for (i = 0; i < arrValues.Length; i++)

                {

                     // 當月角度值  ： 當月銷售額   / 最大銷售額       * 360

                     sglCurrentAngle = arrValues[i] / sglTotalValues * 360;

                     graphics.FillPie(new SolidBrush(GetColor(i)),240,95,100,100,sglTotalAngle,sglCurrentAngle);

                     graphics.DrawPie(Pens.Black,240,95,100,100,sglTotalAngle,sglCurrentAngle);

                     sglTotalAngle += sglCurrentAngle;

                }

           }

           #region Helper Function

           private Color GetColor(int itemIndex)

           {

                Color color;

                switch(itemIndex)

                {

                     case 0:

                           color = Color.Blue;

                           break;

                     case 1:

                           color = Color.Red;

                           break;

                     case 2:

                           color = Color.Yellow;

                           break;

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