利用ZedGraph制作饼图

最新推荐文章于 2020-07-17 23:27:23 发布

jlu_juby

最新推荐文章于 2020-07-17 23:27:23 发布

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分类专栏： ASP.NET 文章标签： dataset list object string dll class

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本文介绍如何使用ZedGraph库在C#项目中绘制饼图，展示年度商品销售前十名的数据。通过实例代码详细解释了从数据库获取数据到图表生成的过程。

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前一阵的一个项目用到了开源项目ZedGraph制作了一个饼图，现把源代码贴出来供大家交流，也方便自己日后查看。

这个项目用的是VS2008，C#代码，zedgraph的版本是：zedgraph_dll_v5.1.4，另外要在项目根目录下面建立一个以ZedGraphImages命名的文件夹，供生成的图片临时存放处。

注：我在制作的过程中baidu搜索了不少相关信息，谢谢大家的无私奉献精神。特别感谢王旭博客上的文章http://www.cnblogs.com/wxukie/archive/2007/05/16/748922.html给我的启示。

//yearTop10CommoditySell.aspx.cs
using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
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.Xml.Linq;

using DHEECommoditySellSystem.ClassFiles;
using ZedGraph;
using ZedGraph.Web;
using System.Drawing;
using System.Drawing.Imaging;
using DHEECommoditySellSystem.DataAccess;
using System.Data.Common;
using System.Data.SqlClient;


namespace DHEECommoditySellSystem.SearchManagement
{
    public partial class Taxis : System.Web.UI.Page
    {
        /// 默认颜色种类
        private List
  defaultColors = new List
 ();
       
       /// 初始化颜色数组
        
        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);
        }

        
        /// PieItem.LabelType数组 
        PieLabelType[] lt = new PieLabelType[]{
            PieLabelType.Name_Percent,
            PieLabelType.Name_Value,
            PieLabelType.Percent,
            PieLabelType.Value,
            PieLabelType.Name_Value
            };


        protected void Page_Load(object sender, EventArgs e)
        {
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            this.ZedGraphWeb1.RenderGraph += new ZedGraph.Web.ZedGraphWebControlEventHandler(this.OnRenderGraph);//注册事件
        }

 
        /// This method is where you generate your graph. 
        /// You are provided with a MasterPane instance that
        /// contains one GraphPane by default (accessible via masterPane[0]).
        /// A graphics instance so you can easily make the call to AxisChange()
        private void OnRenderGraph(ZedGraphWeb cc1, System.Drawing.Graphics g, ZedGraph.MasterPane masterPane)
        {
            InitDefaultColors();
            // Get the GraphPane so we can work with it
            GraphPane myPane = masterPane[0];

            // Set the pane title
            myPane.Title.Text = "本年商品销售Top10";

            // Fill the pane and axis background with solid color
            myPane.Fill = new Fill(Color.Cornsilk);
            myPane.Chart.Fill = new Fill(Color.Cornsilk);
            myPane.Legend.Position = LegendPos.Right;
        
            DatabaseHelper db=new DatabaseHelper();
            DataSet ds = db.ExecuteDataSet("GetTop10CommoditySelledInThisWeek", CommandType.StoredProcedure);
            int i = 0;
            foreach (DataRowView view in ds.Tables[0].DefaultView)
            {
                double salesCount = double.Parse(view[0].ToString());
                string commodityName = view["商品名称"].ToString();

                PieItem segment = myPane.AddPieSlice(salesCount, defaultColors[i], Color.White, 45f, 0, commodityName);
                i++;
                segment.LabelType = PieLabelType.Value;
            }

            // Sum up the values																					
            CurveList curves = myPane.CurveList;
            double total = 0;
            for (int x = 0; x < curves.Count; x++)
                total += ((PieItem)curves[x]).Value;

            // Add a text item to highlight total sales
            TextObj text = new TextObj("Total Week Sales - " + "___FCKpd___0quot; + total.ToString() + "M", 0.85F, 0.80F, CoordType.PaneFraction);
            text.Location.AlignH = AlignH.Center;
            text.Location.AlignV = AlignV.Bottom;
            text.FontSpec.Border.IsVisible = false;
            text.FontSpec.Fill = new Fill(Color.White, Color.PowderBlue, 45F);
            text.FontSpec.StringAlignment = StringAlignment.Center;
            myPane.GraphObjList.Add(text);

            // Add a colored background behind the pie
            BoxObj box = new BoxObj(0, 0, 1, 1, Color.Empty, Color.PeachPuff);
            box.Location.CoordinateFrame = CoordType.ChartFraction;
            box.Border.IsVisible = false;
            box.Location.AlignH = AlignH.Left;
            box.Location.AlignV = AlignV.Top;
            box.ZOrder = ZOrder.E_BehindCurves;
            myPane.GraphObjList.Add(box);

            masterPane.AxisChange(g);
        }
    }
}

    新申请的博客，第一次发帖，有不好之处希望大家指正，望大家多多交流，常来我的博客逛逛。^_^