gdi+实现多种统计图表(饼状,折线,柱状)支持负从标

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 Tom.Control

{

[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

}

调用页面

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;

namespace Web_Graphic

{

/// <summary>

/// WebForm1 的摘要说明。

/// </summary>

public class WebForm1 : System.Web.UI.Page

{

protected Tom.Control.Columniation Columniation1;

private void Page_Load(object sender, System.EventArgs e)

{

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);

DataRow dr=dt.NewRow();

dr["name"]="点1";

dr["db"]="1400";

dr["df"]="500";

dt.Rows.Add(dr);

dr=dt.NewRow();

dr["name"]="点2";

dr["db"]="200";

dr["df"]="200";

dt.Rows.Add(dr);

dr=dt.NewRow();

dr["name"]="点3";

dr["db"]="-300";

dr["df"]="-600";

dt.Rows.Add(dr);

dr=dt.NewRow();

dr["name"]="点4";

dr["db"]="200";

dr["df"]="1500";

dt.Rows.Add(dr);

dr=dt.NewRow();

dr["name"]="点5";

dr["db"]="400";

dr["df"]="2400";

dt.Rows.Add(dr);

Columniation1.Items=dt;

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

}

Web 窗体设计器生成的代码

}

效果如下．．．