基本教程篇--第一节:InitialSampleDemo.cs介绍

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      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.Object
                                                                System.Collections.CollectionBase                                                                        ZedGraph.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。