ASP.NET 柱形图

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <img alt="" id="code" src="Default3.aspx"  style="cursor: pointer;" />
        </div>
    </form>
</body>
</html>

 protected void Page_Load(object sender, EventArgs e)
    {
        // 在此处放置用户代码以初始化页面
        Bitmap objBitMap = new Bitmap(1000, 600);
        Graphics objGraphics;

        objGraphics = Graphics.FromImage(objBitMap);
        objGraphics.Clear(Color.White);

        //人数除以10,绘制矩形条。
        int[] arrValues = { 50, 50, 50, 50, 100, 1200 };

        //厂区
        string[] arrValueNames = new string[] { "第一纺纱厂", "第一纺纱厂", "第一纺纱厂", "第一纺纱厂", "第一纺纱厂", "第一纺纱厂" };

        //标题
        objGraphics.DrawString("三和集团人力资源柱形分析图",
            new Font("宋体", 16), Brushes.Black, new PointF(100, 5));

        PointF symbolLeg = new PointF(600, 20);

        //竖直条
        for (int i = 0; i < arrValues.Length; i++)
        {
            objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 80) + 15, 200 - arrValues[i], 20,
                arrValues[i] + 5);
            objGraphics.DrawRectangle(Pens.Black, (i * 80) + 15, 200 - arrValues[i], 20, arrValues[i] + 5);
            objGraphics.DrawString(arrValueNames[i].ToString(), new Font("宋体", 10), Brushes.Black, new PointF((i * 75) + 15, 50));
            objGraphics.DrawString(arrValueNames[i].ToString(), new Font("宋体", 10), Brushes.Black, new PointF((i * 75) + 15, 250));
        }

        float sglTotalValues = 0;
        for (int i = 0; i <= arrValues.Length - 1; i++)
        {
            sglTotalValues += arrValues[i];
        }


        //饼状图
        //for (int i = 0; i < arrValues.Length; i++)
        //{
        //    sglCurrentAngle = arrValues[i] / sglTotalValues * 360;
        //    objGraphics.FillPie(new SolidBrush(GetColor(i)), 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
        //    objGraphics.DrawPie(Pens.Black, 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
        //    sglTotalAngle += sglCurrentAngle;
        //}

        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        objBitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.ClearContent();
        Response.ContentType = "image/Gif";
        Response.BinaryWrite(ms.ToArray());

    }

    #region 柱形图颜色
    private Color GetColor(int itemIndex)
    {
        Color objColor;
        if (itemIndex % 2 == 0)
        {
            objColor = Color.Yellow;
        }
        else if (itemIndex % 3 == 0)
        {
            objColor = Color.Purple;
        }

        else if (itemIndex % 5 == 0)
        {
            objColor = Color.Brown;
        }

        else if (itemIndex % 7 == 0)
        {
            objColor = Color.Maroon;
        }
        else
        {
            objColor = Color.Blue;
        }
        return objColor;
    }
    #endregion

实例：

// 在此处放置用户代码以初始化页面
        Bitmap objBitMap = new Bitmap(5000, 600);
        Graphics objGraphics;

        objGraphics = Graphics.FromImage(objBitMap);
        objGraphics.Clear(Color.White);


        ZSql s = new ZSql();

        string sql = "select name,(select count(*) from employee where plantId =plant.Id";
        //开始时间 
        if (!string.IsNullOrEmpty(DBHelper.strChartStartDate))
        {
            sql += "  and  (FactoryTime >= '" + DBHelper.strChartStartDate + "')";
        }
        else
        {
            sql += "  and  (FactoryTime >= '1980-01-01')";
        }

        //截止时间
        if (!string.IsNullOrEmpty(DBHelper.strChartEndDate))
        {
            sql += "  and  (FactoryTime <= '" + DBHelper.strChartEndDate + "')";
        }
        else
        {
            sql += "  and  (FactoryTime <= '2080-01-01')";
        }

        sql += " )as ProNum from plant ";

        DataSet ds = s.DSet(sql);

        //标题
        objGraphics.DrawString("三和集团人力资源柱形分析图",
            new Font("宋体", 16), Brushes.Black, new PointF(500, 5));

        PointF symbolLeg = new PointF(600, 20);

        //竖直条
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            int ProNum = int.Parse(ds.Tables[0].Rows[i]["ProNum"].ToString());
            string name = ds.Tables[0].Rows[i]["name"].ToString();

            objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 80) + 30, 200 - ProNum / 10, 20, ProNum / 10 + 5);
            objGraphics.DrawRectangle(Pens.Black, (i * 80) + 30, 200 - ProNum / 10, 20, ProNum / 10 + 5);

            objGraphics.DrawString(ProNum.ToString(), new Font("宋体", 10), Brushes.Black, new PointF((i * 80) + 30, 50));
            objGraphics.DrawString(name, new Font("宋体", 10), Brushes.Black, new PointF((i * 80) + 30, 250));
        }

        ////float sglTotalValues = 0;
        ////for (int i = 0; i <= arrValues.Length - 1; i++)
        ////{
        ////    sglTotalValues += arrValues[i];
        ////}


        //饼状图
        //for (int i = 0; i < arrValues.Length; i++)
        //{
        //    sglCurrentAngle = arrValues[i] / sglTotalValues * 360;
        //    objGraphics.FillPie(new SolidBrush(GetColor(i)), 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
        //    objGraphics.DrawPie(Pens.Black, 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
        //    sglTotalAngle += sglCurrentAngle;
        //}

        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        objBitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.ClearContent();
        Response.ContentType = "image/Gif";
        Response.BinaryWrite(ms.ToArray());

    }

    #region 柱形图颜色
    private Color GetColor(int itemIndex)
    {
        Color objColor;
        if (itemIndex % 2 == 0)
        {
            objColor = Color.Yellow;
        }
        else if (itemIndex % 3 == 0)
        {
            objColor = Color.Purple;
        }

        else if (itemIndex % 5 == 0)
        {
            objColor = Color.Brown;
        }

        else if (itemIndex % 7 == 0)
        {
            objColor = Color.Maroon;
        }
        else
        {
            objColor = Color.Blue;
        }
        return objColor;
    }
    #endregion