.net之生成图表的控件(柱状图,曲线图,饼状图) [转]

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.net之生成图表的控件(柱状图,曲线图,饼状图) [转]

可以生成柱状图,曲线图,饼状图,只要你给他一个datatable,在这声明一下
using System;
using System.Web.UI;
using System.Data;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
using System.ComponentModel;
using System.Collections;

namespace hya.Control
{
    /**//// <summary>
    ///    柱状图控件
    ///    需要传入列表项名，值，超级连接地址
    /// </summary>
    [ToolboxData("<{0}:Columniation runat=server></{0}:Columniation>")]
    public class Columniation : System.Web.UI.WebControls.WebControl
    {
        private const int _colorLimit = 12;  //颜色列表
        private Color[] _color =
   {
    Color.Chocolate,
    Color.YellowGreen,
    Color.Olive,
    Color.DarkKhaki,
    Color.Sienna,
    Color.PaleGoldenrod,
    Color.Peru,
    Color.Tan,
    Color.Khaki,
    Color.DarkGoldenrod,
    Color.Maroon,
    Color.OliveDrab
   };

        private DataTable items;//列表项名称和值

        private string text = "数据";
        private string datastd = "标准值";
        private string data = "实时数据";

        int kds = 10; //刻度数
        float kddw = 100;  //没刻度大小

        int zmheight = 500; //真个图区高
        int zmwidth = 740;  //真个图区宽

        int height = 400;//呈现区高
        int width = 730;
        int cxtop = 30;//呈现区距顶距离
        int cxleft = 30;//呈现区左边距离

        Color bzlink = Color.Black;//标准线颜色

        int Chart_Flag = 1;
        Bitmap bm;

        int Displacement = 0; //获取负坐标刻度数

        [Bindable(true),
        Category("Appearance"),
        DefaultValue("")]
        public string Text
        {
            get
            {
                return text;
            }

            set
            {
                text = value;
            }
        }

        [Bindable(true),
        Category("Appearance"),
        DefaultValue("")]
        public string DataStdName
        {
            get
            {
                return datastd;
            }

            set
            {
                datastd = value;
            }
        }

        [Bindable(true),
        Category("Appearance"),
        DefaultValue("")]
        public string DataName
        {
            get
            {
                return data;
            }

            set
            {
                data = value;
            }
        }

        /**//// <summary>
        /// 需要呈现的数据
        /// </summary>
        public DataTable Items
        {
            set
            { items = value; }
        }

        /**//// <summary>
        /// 需要显示的刻度量
        /// </summary>
        public int Kdcount
        {
            set { kds = value; }
        }

        /**//// <summary>
        /// 刻度大小
        /// </summary>

        public float Kddw
        { set { kddw = value; } }

        public int ChatStyle
        { set { this.Chart_Flag = value; } }

        /**//// <summary>
        /// 将此控件呈现给指定的输出参数。
        /// </summary>
        /// <param text="output"> 要写出到的 HTML 代码 </param>
        protected override void Render(HtmlTextWriter output)
        {
            //if(dt==null)
            //{
            // return "没有数据";
            //}
            //设计样式
            kd(items);
            output.Write(makeimage(items, "c:/"));

        }

        private string makeimage(DataTable dt, string imagefile)
        {

            string url = "";

            switch (Chart_Flag)
            {
                case 1:
                    {

                        this.Draw_X_Y_Bar(dt);
                        url = this.Drar_Bar(dt);

                        break;
                    }
                case 2:
                    {

                        this.Draw_X_Y(dt);
                        url = this.Drow_Lin(dt);

                        break;
                    }
                case 3:
                    {

                        url = this.Draw_Pie(dt);
                        break;
                    }

            }

            return url;

        }
        /**//// <summary>
        /// 换算成实际值
        /// </summary>
        /// <param text="kd">提供的值</param>
        /// <returns>返回换算后的实际值</returns>
        private float bl(float kd)
        {
            float bls = 1;
            bls = (float)height / ((float)kds * (float)kddw);
            return (float)kd * bls;
        }

        //通过数据计算刻度,和负坐标数

        //
        绘制折线图

        画住状图

        画　X,Y 轴线和刻度

        画　柱状 x,y 　刻度

        饼状图

    }
}

在调用时很简单, 首先将它编译成控件,在aspx页添加引用

<%@ Register TagPrefix="cc1" Namespace="hya.Control" Assembly="Columniation" %>

在你需要显示图表的地方添加如下标签:

<cc1:Columniation id="Columniation1" runat="server"></cc1:Columniation>
在对应的.cs页写下如下的代码

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            DataTable dt = new DataTable();
            DataColumn dc;

            dc = new DataColumn();
            dc.DataType = System.Type.GetType("System.String");
            dc.ColumnName = "name";
            dt.Columns.Add(dc);

            dc = new DataColumn();
            dc.DataType = System.Type.GetType("System.Int32");
            dc.ColumnName = "db";
            dt.Columns.Add(dc);

         dc = new DataColumn();
           dc.DataType = System.Type.GetType("System.Int32");
           dc.ColumnName = "df";
            dt.Columns.Add(dc);

            dc = new DataColumn();
          dc.DataType = System.Type.GetType("System.Int32");
           dc.ColumnName = "dz";
           dt.Columns.Add(dc);

            DataRow dr = dt.NewRow();

            dr["name"] = "点1";

            dr["db"] = "1000";
           dr["df"] = "500";
          dr["dz"] = "240";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["name"] = "点2";

            dr["db"] = "200";
           dr["df"] = "200";
         dr["dz"] = "240";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["name"] = "点3";

            dr["db"] = "300";
          dr["df"] = "600";
          dr["dz"] = "240";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["name"] = "点4";

            dr["db"] = "200";
            dr["df"] = "1500";
           dr["dz"] = "240";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["name"] = "点5";

            dr["db"] = "400";
         dr["df"] = "2400";
         dr["dz"] = "240";
            dt.Rows.Add(dr);


            Columniation1.Items = dt;
            Columniation1.ChatStyle = 3;  //1 为柱状,2 为折线,３为屏状

    }
}

其生成的饼状图如下:

其生成的柱状图如下:

其生成的折线图如下:

0

0

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原文地址：https://www.cnblogs.com/zhangq723/p/1656026.html