基本教程篇--第一节：InitialSampleDemo.cs介绍

   第一节：InitialSampleDemo.cs介绍

        为了讲解方便，我先附上源代码和效果图。

代码如下：

using System;

using System.Drawing;

using System.Collections;

 

using ZedGraph;

 

namespace ZedGraph.Demo

{

     ///<summary>

     /// Summary description for SimpleDemo.

     ///</summary>

     public class InitialSampleDemo : DemoBase

     {

 

           public InitialSampleDemo() : base(
"Code Project Initial Sample",

                "Initial Sample", DemoType.Tutorial )

           {

                GraphPane myPane = base.GraphPane;

 

                // Set the title and axis labels

                myPane.Title = "My Test Graph/n(For CodeProject Sample)";

                myPane.XAxis.Title = "My X Axis";

                myPane.YAxis.Title = "My Y Axis";

               

                // Make up some data arrays based on the Sine function

                PointPairList list1 = new PointPairList();

                PointPairList list2 = new PointPairList();

                for ( int i=0; i<36; i++
)

                {

                     double x = (double)
i + 5;

                     double y1 = 1.5 + Math.Sin( (double)
i * 0.2 );

                     double y2 = 3.0 * ( 1.5 + Math.Sin( (double)
i * 0.2 ) );

                     list1.Add( x, y1 );

                     list2.Add( x, y2 );

                }

 

                // Generate a red curve with diamond

                // symbols, and "Porsche" in the legend

                LineItem myCurve = myPane.AddCurve( "Porsche",

                     list1, Color.Red, SymbolType.Diamond );

 

                // Generate a blue curve with circle

                // symbols, and "Piper" in the legend

                LineItem myCurve2 = myPane.AddCurve( "Piper",

                     list2, Color.Blue, SymbolType.Circle );

 

                base.ZedGraphControl.AxisChange();

           }

     }

}

 

        我们可以看到，InitialSampleDemo继承自CemoBase类，而DemoBase又继承自ZedGraphDemo这个接口。ZedGraphDemo接口定义了String Description、String Title、ZedGraph. ZedGraphControl ZedGraphControl 和 System.Collection.ICollection Types这四个属性。DemoBase除了实现这四个属性外，还添加了PaneBase Pane和MasterPane
MasterPane这两个属性，此外DemoBase还实现了多载构造函数。关于各个类的具体含义和用法，我会在以后的篇幅中陆续介绍。这里只是给大家一个整体的大致结构。

        下面进行对代码的分析，由于这是第一个例子，所有我会讲得比较细，以后的例子就不会了。

        我们可以看到程序首先

public InitialSampleDemo() : base( "Code Project Initial Sample" , "Initial Sample", DemoType.Tutorial
)

初始化基类的构造函数。基类重载了四个构造函数

public DemoBase( string description, string title, DemoType type )

           {

                ArrayList types = new ArrayList();

                types.Add( type );

 

                Init( description, title, types );

           }

          

           public DemoBase( string description, string title,
DemoType type, DemoType type2 )

           {

                ArrayList types = new ArrayList();

                types.Add( type );

                types.Add( type2 );

 

                Init( description, title, types );

           }

          

           public DemoBase( string description, string title,
ICollection types )

           {

                Init( description, title, types );

           }

          

           private void Init( string description, string title,
ICollection types )

           {

                this.description = description;

                this.title = title;

                this.types = types;

 

                control = new ZedGraphControl();

           }

函数中的变量含义如下：

Description:对此结构的描述。

Title:在树形结构(TreeView)中显示的标题。

Types:要把此类显示在哪个树形结构的区域中。若有多个Types，则把此类分入不同的树形区域中。例如MasterPane Sample在Tutorial Sample和 Special Features两个区域都有。见图中的相应区域标注。

                        myPane.Title = "My Test Graph/n(For CodeProject Sample)";

                myPane.XAxis.Title = "My X Axis";

                myPane.YAxis.Title = "My Y Axis";

     分别指定这个Pane的title、XAxis和YAxis的标题。见上图。

 

                PointPairList list1 = new PointPairList();

                PointPairList list2 = new PointPairList();

                for ( int i=0; i<36; i++
)

                {

                     double x = (double)
i + 5;

                     double y1 = 1.5 + Math.Sin( (double)
i * 0.2 );

                     double y2 = 3.0 * ( 1.5 + Math.Sin( (double)
i * 0.2 ) );

                     list1.Add( x, y1 );

                     list2.Add( x, y2 );

                }

        PointPairList类是一个集合类，继承自

                                                        System.ObjectSystem.Collections.CollectionBaseZedGraph.CollectionPlus

它是PointPair对象的集合，PointPair类是一个包含(X,Y)的坐标类。

其中的for循环在为两个PointPairList复值。

 

LineItem myCurve = myPane.AddCurve( "Porsche", list1, Color.Red, SymbolType.Diamond );

LineItem类是ZedGraph中的线条类.

myPane.AddCurve( "Porsche", list1, Color.Red, SymbolType.Diamond );

的意思是将刚刚赋值的list以”Porsche”这个名字以红色和水晶形状画到Pane中，这个函数的返回值是一个LineItem。你可以通过myCurve这个变量来对它进行进一步的设定。其中SymbolType是个Enum，它枚举了12个可供使用的形状

 

最后一步就是刷新了。base.ZedGraphControl.AxisChange();

这样整个程序就完成了，简单吧，其实这是个简单的应该，以后会介绍更加复杂的用法和类库。