.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: