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．．．
\
