ZedGraph类库之基本教程---PieSampleDemo.cs（画饼）

ZedGraph类库之基本教程

PieSampleDemo.cs介绍

        这节我把饼形图粗略的介绍一下，如下图。

PieSampleDemo.cs（画饼）

 

using System;

using System.Drawing;

using System.Collections;

 

using ZedGraph;

 

namespace ZedGraph.Demo

{

     ///<summary>

     /// Summary description for SimpleDemo.

     ///</summary>

     public class PieSampleDemo : DemoBase

     {

 

           public PieSampleDemo() : base( "Code Project Pie Sample",

                                                "Pie Sample", DemoType.Pie, DemoType.Tutorial )

           {

                GraphPane myPane = base.GraphPane;

 

                // Set the GraphPane title

                myPane.Title = "2004 ZedGraph Sales by Region/n($M)";

                myPane.FontSpec.IsItalic = true;

                myPane.FontSpec.Size = 24f;

                myPane.FontSpec.Family = "Times";

 

                // Fill the pane background with a color gradient

                myPane.PaneFill = new Fill( Color.White, Color.Goldenrod, 45.0f );

                // No fill for the axis background

                myPane.AxisFill.Type = FillType.None;

 

                // Set the legend to an arbitrary location

                myPane.Legend.Position = LegendPos.Float ;

                myPane.Legend.Location = new Location( 0.95f, 0.15f, CoordType.PaneFraction,

                                           AlignH.Right, AlignV.Top );

                myPane.Legend.FontSpec.Size = 10f;

                myPane.Legend.IsHStack = false;

               

                // Add some pie slices

                PieItem segment1 = myPane.AddPieSlice( 20, Color.Navy, Color.White, 45f, 0, "North" );

                PieItem segment3 = myPane.AddPieSlice( 30, Color.Purple, Color.White, 45f, .0, "East" );

                PieItem segment4 = myPane.AddPieSlice( 10.21, Color.LimeGreen, Color.White, 45f, 0, "West" );

                PieItem segment2 = myPane.AddPieSlice( 40, Color.SandyBrown, Color.White, 45f, 0.2, "South" );

                PieItem segment6 = myPane.AddPieSlice( 250, Color.Red, Color.White, 45f, 0, "Europe" );

                PieItem segment7 = myPane.AddPieSlice( 50, Color.Blue, Color.White, 45f, 0.2, "Pac Rim" );

                PieItem segment8 = myPane.AddPieSlice( 400, Color.Green, Color.White, 45f, 0, "South America" );

                PieItem segment9 = myPane.AddPieSlice( 50, Color.Yellow, Color.White, 45f, 0.2, "Africa" );

               

                segment2.LabelDetail.FontSpec.FontColor = Color.Red;

                                                               

                // Sum up the pie values                                                                                                             

                CurveList curves = myPane.CurveList ;

                double total = 0 ;

                for ( int x = 0 ; x < curves.Count ; x++ )

                     total += ((PieItem)curves[x]).Value ;

 

                // Make a text label to highlight the total value

                TextItem text = new TextItem( "Total 2004 Sales/n" + "$" + total.ToString () + "M",

                                           0.18F, 0.40F, 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.FromArgb( 255, 100, 100 ), 45F );

                text.FontSpec.StringAlignment = StringAlignment.Center ;

                myPane.GraphItemList.Add( text );              

 

                // Create a drop shadow for the total value text item

                TextItem text2 = new TextItem( text );

                text2.FontSpec.Fill = new Fill( Color.Black );

                text2.Location.X += 0.008f;

                text2.Location.Y += 0.01f;

                myPane.GraphItemList.Add( text2 );

                 

                base.ZedGraphControl.AxisChange();

           }

     }

}

 

代码分析：

我们先把Legend类的相关属性再补充一下。

// Set the legend to an arbitrary location

                myPane.Legend.Position = LegendPos.Float ;

                myPane.Legend.Location = new Location( 0.95f, 0.15f, CoordType.PaneFraction,

                                           AlignH.Right, AlignV.Top );

                myPane.Legend.FontSpec.Size = 10f;

                myPane.Legend.IsHStack = false;

LegendPos是一个枚举，共有13个枚举值：Top、Left、Right、Bottom、InsideTopLeft、InsideTopRight、InsideBotLeft、InsideBotRight、Float、TopCenter、BottomCenter、TopFlushLeft和BottomFlushLeft。具体含义我就不解释了，都是关于Legend位置的。

Location是指定Legend具体坐标的一个类，要注意的是，只有当LegendPos是Float时，Location才会起作用。

FontSpec类就是一个字体类，里面是关于字体的一些相关设置，这里不再细说。

IsHStack是一个Legend的属性，是设置Legend中文字和图形的显示方式是水平还是垂直。

 

下面说说本节的主角PieItem类：

PieItem segment6 = myPane.AddPieSlice( 250, Color.Red, Color.White, 45f, 0, "Europe" );

Pie重载了五个构造函数，上面是参数最多的一个构造函数，共有六个，意思分别是：在整个饼形图中占的比重，渐变颜色1，渐变颜色2，渐变颜色角度，远离中心点的距离，饼形图的文字注释。

饼形图也是继承 ZedGraph.CurveItem，与其它继承CurveItem不同的是，PieItem有一个value的属性，可以方便的存取PieItem实例的值，从而可以很方便的动态改变一个饼形在整个饼形区域所占的比重。

 

 

方法二:

首先引用ZedGraph.dll动态库.

然后在工具箱里"添加/移除项"-----"netframework控件中引用该dll"-----加载到工具箱,然后拖动该该工具到你的窗体，即zedGraphControl1.然后

cs代码:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using ZedGraph;

//定义 
  public void CreateChart( ZedGraphControl zgc )
  {
   GraphPane myPane = zgc.GraphPane;

   // Set the GraphPane title
   myPane.Title = "2004 ZedGraph Sales by Region/n($M)";
   myPane.FontSpec.IsItalic = true;
   myPane.FontSpec.Size = 24f;
   myPane.FontSpec.Family = "Times New Roman";

   // Fill the pane background with a color gradient
   myPane.PaneFill  = new Fill( Color.White, Color.Goldenrod, 45.0f );
   // No fill for the chart background
   myPane.AxisFill.Type = FillType.None;

   // Set the legend to an arbitrary location
   myPane.Legend.Position = LegendPos.Float;
   myPane.Legend.Location = new Location( 0.95f, 0.15f, CoordType.PaneFraction,
    AlignH.Right, AlignV.Top );
   myPane.Legend.FontSpec.Size = 10f;
   myPane.Legend.IsHStack = false;

   // Add some pie slices
   PieItem segment1 = myPane.AddPieSlice( 20, Color.Navy, Color.White, 45f, 0, "North" );
   PieItem segment3 = myPane.AddPieSlice( 30, Color.Purple, Color.White, 45f, .0, "East" );
   PieItem segment4 = myPane.AddPieSlice( 10.21, Color.LimeGreen, Color.White, 45f, 0, "West" );
   PieItem segment2 = myPane.AddPieSlice( 40, Color.SandyBrown, Color.White, 45f, 0, "South" );
   PieItem segment6 = myPane.AddPieSlice( 250, Color.Red, Color.White, 45f, 0, "Europe" );
   PieItem segment7 = myPane.AddPieSlice( 150, Color.Blue, Color.White, 45f, 0, "Pac Rim" );
   PieItem segment8 = myPane.AddPieSlice( 400, Color.Green, Color.White, 45f, 0, "South America" );
   PieItem segment9 = myPane.AddPieSlice( 50, Color.Yellow, Color.White, 45f, 0, "Africa" );

   segment2.LabelDetail.FontSpec.FontColor = Color.Red;

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

   // Make a text label to highlight the total value
   TextItem text = new TextItem( "Total 2004 Sales/n" + "$" + total.ToString() + "M",
    0.18F, 0.40F, 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.FromArgb( 255, 100, 100 ), 45F );
   text.FontSpec.StringAlignment = StringAlignment.Center;  
            myPane.GraphItemList.Add( text );    
   // Create a drop shadow for the total value text item
   TextItem text2  = new TextItem( text );
   text2.FontSpec.Fill = new Fill( Color.Black );
   text2.Location.X += 0.008f;
   text2.Location.Y += 0.01f;
   myPane.GraphItemList.Add( text2 );

   // Calculate the Axis Scale Ranges
   zgc.AxisChange();

  }

调用

 CreateChart(zedGraphControl1);