使用ZedGraph画曲线柱状图

简介:
   刚接触到ZedGraph,到网上搜素到的方法基本上都是使用临时文件来存储图片,然后再显示,但是临时图片太多的话会占用大量的空间。很不划算。最后看到有人说把RenderMode="RawImage"就可以了 ,但是会出现乱码。如何解决呢?下面是我的方法。

    新建一个目录,命名为bin,把文件ZedGraph.Web.dllZedGraph.dll拷到bin目录下面。

建立文件tuppian.aspx。其内容为:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="tuppian.aspx.cs" Inherits="tuppian" %>

<%@ Register assembly="ZedGraph.Web" namespace="ZedGraph.Web" tagprefix="cc1" %>

<%--

特别注意了:本页面不要有HTML代码,和asp.net代码。不然会出现乱码,RenderMode="RawImage"一定要设置RawImage,不然会报错。

--%>

<cc1:ZedGraphWeb ID="ZedGraphWeb1" runat="server" RenderMode="RawImage">

</cc1:ZedGraphWeb>

tuppian.aspx.cs
为:

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Drawing; 
using ZedGraph; 
using ZedGraph.Web; 

public partial class tuppian : System.Web.UI.Page 

    DarwGrapClass dg = new DarwGrapClass(); 
    protected void Page_Load(object sender, EventArgs e) 
    { 
    } 
    protected override void OnInit(EventArgs e) 
    { 
        InitializeComponent(); 
        base.OnInit(e); 
    } 

    private void InitializeComponent() 
    { 
        string id = Request.QueryString["id"]; 
        switch (id) 
        { 
            case "1": 
                DrawLine(); 
                break; 
            case "2": 
                DrawPie(); 
                break; 
            default: 
                DrawBar(); 
                break; 
        } 
    } 

    private void DrawBar() 
    { 
        dg.Type = AnalyticsType.Bar; 
        dg.Title = "
用户访问柱状图"; 
        dg.XAxisTitle = "
月份
"; 
        dg.YAxisTitle = "
用户访问数量
"; 
        Random rand = new Random(); 
        string[] aa = { "
企业1", "企业2", "企业
3" }; 
        for (int i = 0; i < 2; i++) 
        { 
            ZedGraph.PointPairList ppl = new ZedGraph.PointPairList(); 
            for (int j = 0; j < 12; j++) 
            { 
                double x = rand.Next(10); 
                double y = rand.NextDouble() * 100; 
                ppl.Add(x, y); 
                //dg.NameList.Add((j + 1).ToString() + "
"); 
                //ppl.Add(j+1,j+1);
以此递增
 
                //dg.NameList.Add("
" + j.ToString() + "月份
"); 
            } 
            dg.DataSource.Add(ppl); 
            dg.LabelList.Add("
企业
" + i.ToString()); 
            //dg.NameList.Add((i + 1).ToString() + "
"); 
        } 
        for (int k = 0; k < 12; k++) 
        { 
            dg.NameList.Add((k + 1).ToString() + "
"); 
        } 
        dg.y_step = 5; 
        dg.DarwGrap(ZedGraphWeb1); 
    } 

    private void DrawPie() 
    { 
        dg.Type = AnalyticsType.Pie; 
        dg.Title = "
用户访问饼图
"; 
        Random rand = new Random(); 
        for (int i = 0; i < 3; i++) 
        { 
            dg.ScaleData.Add((i + 2) * rand.Next(100)); 
            dg.NameList.Add("
企业:" + i.ToString());//各个部分所代表的含义
 
        } 
        dg.DarwGrap(ZedGraphWeb1); 
    } 
    private void DrawLine() 
    { 
        dg.Type = AnalyticsType.Line; 
        dg.Title = "
用户访问曲线图
"; 
        dg.XAxisTitle = "
月份
"; 
        dg.YAxisTitle = "
用户访问数量
"; 
        Random rand = new Random(); 
        for (int i = 0; i < 2; i++) 
        { 
            ZedGraph.PointPairList ppl = new ZedGraph.PointPairList(); 
            //
数据源添加
 
            for (double x = 0; x < 12; x += 1.0) 
            { 
                double y = rand.NextDouble() * 100; 
                ppl.Add(x, y); 
            } 
            //
从数据库中取得
 
            //for (int i = 0; i < this.dt.Rows.Count; i++)  //
这个循环主要是取到里面的说明文字,用了一个数组的方法
 
            //{ 
            //    ppl.Add(i,this.dt.Rows[i].Cells[1].Text.Trim()); 
            //} 
            //dg.NameList.Add("
" + i.ToString() + "月份
"); 
            dg.DataSource.Add(ppl); 
            dg.NameList.Add("
企业:
" + i.ToString()); 
        } 
        //
改变x组的显示字符,当然也可以绑定数据库,从数据库中取得。
 
        for (int k = 0; k < 12; k++) 
        { 
            dg.LabelList.Add((k + 1).ToString() + "
"); 
        } 
        //for (int i = 0; i < this.dt.Rows.Count; i++)  //
这个循环主要是取到里面的说明文字,用了一个数组的方法
 
        //{ 
        //    dg.LabelList.Add(this.dt.Rows[i].Cells[0].Text.Trim()); 
        //} 
        dg.DarwGrap(ZedGraphWeb1); 

}
新建一个类DarwGrapClass.cs,放在App_Code目录下面。其内容为:


using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Drawing; 
using ZedGraph; 
using ZedGraph.Web; 
using System.Collections.Generic; 

public enum AnalyticsType 

    Line, //
折线图 
    Line2,//
带阴影区域的折线图
 
    Curve,//
带星的折线图
 
    Curve2,//
带阴影区域的星行折线图
 
    Bar, //
柱状图
 
    Graph, 
    Pie //
饼图
 
}; 
public class DarwGrapClass 

    public DarwGrapClass() 
    { 
        // 
        //TODO: 
在此处添加构造函数逻辑
 
        // 
    } 
    #region Private Attribute 
    /**/ 
    ///  
    /// 
默认颜色种类
 
    ///  
    private List<Color> defaultColors = new List<Color>(); 
    /**/ 
    ///  
    /// 
统计的个数
 
    ///  
    private int Count; 
    #endregion 

    //Public Property; 
    #region Public Property 
    /**/ 
    ///  
    /// 
统计图的名称
 
    ///  
    public string Title; 
    /**/ 
    ///  
    /// 
横轴的名称(饼图不需要)
 
    ///  
    public string XAxisTitle; 
    /**/ 
    ///  
    /// 
纵轴的名称(饼图不需要)
 
    ///  
    public string YAxisTitle; 
    /**/ 
    ///  
    /// 
显示的曲线类型:
Line,Bar,Pie 
    ///  
    public AnalyticsType Type; 
    /**/ 
    ///  
    /// 
折线图和柱状图的数据源
 
    ///  
    public List<PointPairList> DataSource = new List<PointPairList>(); 
    /**/ 
    ///  
    /// 
饼图的数据源
 
    ///  
    public List<double> ScaleData = new List<double>(); 
    /**/ 
    ///  
    /// 
各段数据的颜色
 
    ///  
    public List<Color> Colors = new List<Color>(); 
    /**/ 
    ///  
    /// 
各段数据的名称
 
    ///  
    public List<string> NameList = new List<string>(); 
    /**/ 
    ///  
    /// 
用于柱状图,每个圆柱体表示的含义
 
    ///  
    public List<string> LabelList = new List<string>(); 
    public double y_step; 
    public double x_step; 
    #endregion 
    public void DarwGrap(ZedGraphWeb ZedGraph) 
    { 
        ZedGraph.RenderGraph += new ZedGraph.Web.ZedGraphWebControlEventHandler(zedGraphControl_RenderGraph); 

    } 

    private void InitDefaultColors() 
    { 
        defaultColors.Add(Color.Red); 
        defaultColors.Add(Color.Green); 
        defaultColors.Add(Color.Blue); 
        defaultColors.Add(Color.Yellow); 
        defaultColors.Add(Color.YellowGreen); 
        defaultColors.Add(Color.Brown); 
        defaultColors.Add(Color.Aqua); 
        defaultColors.Add(Color.Cyan); 
        defaultColors.Add(Color.DarkSeaGreen); 
        defaultColors.Add(Color.Indigo); 
    } 
    /**/ 
    ///  
    /// 
如果属性为空则初始化属性数据
 
    ///  
    private void InitProperty() 
    { 
        InitDefaultColors(); 
        if (string.IsNullOrEmpty(Title)) 
        { 
            Title = "
未命名统计图
"; 
        } 
        if (string.IsNullOrEmpty(XAxisTitle)) 
        { 
            XAxisTitle = "
横轴
"; 
        } 
        if (string.IsNullOrEmpty(YAxisTitle)) 
        { 
            YAxisTitle = "
纵轴
"; 
        } 
        if (Type == AnalyticsType.Pie) 
        { 
            Count = ScaleData.Count; 
        } 
        else 
        { 
            Count = DataSource.Count; 
        } 
        if (Colors.Count == 0 || Colors.Count != Count) 
        { 
            Random r = new Random(); 
            int tempIndex = 0; 
            List<int> tempIndexList = new List<int>(); 
            for (int i = 0; i < Count; i++) 
            { 
                tempIndex = r.Next(defaultColors.Count); 
                if (tempIndexList.Contains(tempIndex)) 
                { 
                    i--; 
                } 
                else 
                { 
                    tempIndexList.Add(tempIndex); 
                    Colors.Add(defaultColors[tempIndex]); 
                } 
            } 
        } 
        if (NameList.Count == 0) 
        { 
            if (Type == AnalyticsType.Bar) 
            { 
                for (int i = 1; i < DataSource[0].Count + 1; i++) 
                { 
                    NameList.Add("
" + i.ToString() + "
"); 
                } 
            } 
            else 
            { 
                for (int i = 1; i < Count + 1; i++) 
                { 
                    NameList.Add("
" + i.ToString() + "
"); 
                } 
            } 
        } 
        if (LabelList.Count == 0) 
        { 
            for (int i = 0; i < Count; i++) 
            { 
                LabelList.Add("
含义
" + i.ToString()); 
            } 
        } 
        if (x_step == 0.0) 
            x_step = 5; 
        if (y_step == 0.0) 
            y_step = 5; 

    } 
    /**/ 
    ///  
    /// 
画图
 
    ///  
    ///  
    ///  
    ///  
    private void zedGraphControl_RenderGraph(ZedGraphWeb zgw, System.Drawing.Graphics g, ZedGraph.MasterPane masterPane) 
    { 
        InitProperty(); 

        GraphPane myPane = masterPane[0]; 

        myPane.Title.Text = Title; 
        myPane.XAxis.Title.Text = XAxisTitle; 
        myPane.YAxis.Title.Text = YAxisTitle; 

        //if (true) 
        //{ 
        // DrawMessage(myPane, "yiafdhaskjhfasfksahfasdlhfaslf lasgfasglgsadi"); 
        // pane.AxisChange(g); 
        // return; 
        //} 

        switch (Type) 
        { 
            case AnalyticsType.Line: 
                DrawLine(myPane); 
                break; 
            case AnalyticsType.Bar: 
                DrawBar(myPane); 
                break; 
            case AnalyticsType.Pie: 
                DrawPie(myPane); 
                break; 
            case AnalyticsType.Line2: 
                DrawLine2(myPane); 
                break; 
            case AnalyticsType.Curve: 
                DrawCurve(myPane); 
                break; 
            case AnalyticsType.Curve2: 
                DrawCurve2(myPane); 
                break; 
            default: 
                break; 
        } 
        masterPane.AxisChange(g); 
    } 

    #region Draw 
    /**/ 
    ///  
    /// 
画折线图
 
    ///  
    ///  
    private void DrawLine(GraphPane graphPane) 
    { 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddCurve(NameList[i], DataSource[i], Colors[i], SymbolType.None); 
            string[] labels = LabelList.ToArray(); 
            graphPane.XAxis.Scale.TextLabels = labels; 
            graphPane.XAxis.Type = AxisType.Text; 
            graphPane.Chart.Fill = new Fill(Color.White, Color.FromArgb(255, 255, 166), 90F); 
            graphPane.Fill = new Fill(Color.FromArgb(250, 250, 255)); 
            graphPane.YAxis.Scale.MajorStep = y_step; 
        } 
    } 
    /**/ 
    ///  
    /// 
画折线图,带阴影区域
 
    ///  
    ///  
    private void DrawLine2(GraphPane graphPane) 
    { 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddCurve(NameList[i], DataSource[i], Colors[i], SymbolType.None).Line.Fill = new Fill(Color.White, Colors[i], 90F); 
            string[] labels = LabelList.ToArray(); 
            graphPane.XAxis.Scale.TextLabels = labels; 
            graphPane.XAxis.Type = AxisType.Text; 
            graphPane.Chart.Fill = new Fill(Color.White, Color.FromArgb(255, 255, 166), 90F); 
            graphPane.Fill = new Fill(Color.FromArgb(250, 250, 255)); 
            graphPane.YAxis.Scale.MajorStep = y_step; 
        } 
    } 
    /**/ 
    ///  
    /// 
画星行折线图
 
    ///  
    ///  
    private void DrawCurve(GraphPane graphPane) 
    { 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddCurve(NameList[i], DataSource[i], Colors[i], SymbolType.Star); 
            string[] labels = LabelList.ToArray(); 
            graphPane.XAxis.Scale.TextLabels = labels; 
            graphPane.XAxis.Type = AxisType.Text; 
            graphPane.Chart.Fill = new Fill(Color.White, Color.FromArgb(255, 255, 166), 90F); 
            graphPane.Fill = new Fill(Color.FromArgb(250, 250, 255)); 
            graphPane.YAxis.Scale.MajorStep = y_step; 
        } 
    } 
    /**/ 
    ///  
    /// 
画星行折线图,带阴影区域
 
    ///  
    ///  
    private void DrawCurve2(GraphPane graphPane) 
    { 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddCurve(NameList[i], DataSource[i], Colors[i], SymbolType.Star).Line.Fill = new Fill(Color.White, Colors[i],90F); 
            string[] labels = LabelList.ToArray(); 
            graphPane.XAxis.Scale.TextLabels = labels; 
            graphPane.XAxis.Type = AxisType.Text; 
            graphPane.Chart.Fill = new Fill(Color.White, Color.FromArgb(255, 255, 166), 90F); 
            graphPane.Fill = new Fill(Color.FromArgb(250, 250, 255)); 
            graphPane.YAxis.Scale.MajorStep = y_step; 
        } 
    } 

    /**/ 
    ///  
    /// 
画柱状图
 
    ///  
    ///  
    private void DrawBar(GraphPane graphPane) 
    { 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddBar(LabelList[i], DataSource[i], Colors[i]).Bar.Fill = new Fill(Colors[i], Color.White, Colors[i]); 
            //.Line.Fill = new Fill(Color.White, Color.Red, 45F); 
            //.Line.Fill = new Fill(Color.White, Color.Blue, 45F); 
        } 
        graphPane.XAxis.MajorTic.IsBetweenLabels = true; 
        string[] labels = NameList.ToArray(); 
        graphPane.XAxis.Scale.TextLabels = labels; 
        graphPane.XAxis.Type = AxisType.Text; 
        graphPane.Chart.Fill = new Fill(Color.White, Color.FromArgb(255, 255, 166), 90F); 
        //graphPane.Fill = new Fill(Color.FromArgb(250, 250, 255)); 
        graphPane.Fill = new Fill(Color.White, Color.FromArgb(200, 200, 255), 45.0f); 
        //graphPane.Chart.Fill = new Fill(Color.White, Color.LightGoldenrodYellow, 45.0f); 
        graphPane.YAxis.Scale.MajorStep = y_step; 
        //graphPane.BaseDimension =8; 


    } 
    /**/ 
    ///  
    /// 
画饼图
 
    ///  
    ///  
    private void DrawPie(GraphPane graphPane) 
    { 
        graphPane.Fill = new Fill(Color.White, Color.Silver, 45.0f); 

        graphPane.Legend.Position = LegendPos.Float; 
        graphPane.Legend.Location = new Location(0.95f, 0.15f, CoordType.PaneFraction, AlignH.Right, AlignV.Top); 
        graphPane.Legend.FontSpec.Size = 20f; 
        graphPane.Legend.IsHStack = false; 
        for (int i = 0; i < Count; i++) 
        { 
            graphPane.AddPieSlice(ScaleData[i], Colors[i], Color.White, 45f, 0, NameList[i]); 
        } 
    } 
    /**/ 
    ///  
    /// 
如果系统出错,显示错误信息
 
    ///  
    ///  
    ///  
    private void DrawMessage(GraphPane graphPane, string message) 
    { 
        TextObj text = new TextObj(message, 200, 200); 
        text.Text = message; 
        graphPane.GraphObjList.Add(text); 

    } 
    #endregion 




最后,注意当画饼图时,有时注释会把图片遮住,这时只要设置图片长和高的比例就可以了。曲线图和直方图的x組的说明文字如果太多的话,就会屏蔽掉一些,这是也只要设置长和高的比例就可以解决问题了。





本文转自 qianshao 51CTO博客,原文链接:http://blog.51cto.com/qianshao/202157,如需转载请自行联系原作者

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