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．．．


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posted on 2006-05-09 08:54  gwazy  阅读(745)  评论(0)  编辑  收藏  举报

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