大约在半年前,我写了几篇介绍Silverlight Toolkit的文章,对里面的一些可能会用
到的控件做了介绍,文章链接如下:
     前两天,当再次拜访其官方链接之后,发现其版本已升级到了3.0,其中又新增了不少
有意思的控件,我将会用四篇文章来简要介绍一下:)
首先就是其图表控件集合中新增了两种类型,分别为:Area,Bubble(区域图和冒泡图)。
下面就是其演示效果:
 
   
     
     首先,我们要创建一个SL应用,并在项目中加载对下面DLL文件的引用(来自下载的源
码包):    
然后在相应的XAML文件中添加对控件的声明,如下:
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<chartingToolkit:Chart x:Name="AreaEmployeeList" Grid.Row="0" Grid.Column="0" Title="区域图" />
<chartingToolkit:Chart x:Name="BubbleEmployeeList" Grid.Row="0" Grid.Column="1" Title="气泡图" />
Grid>
UserControl>
    
      因为要显示数据,所以我直接将数据对象集合“硬编码”到CS文件中,如下:
{
List<EmployeeInfo> employeeList = new List<EmployeeInfo>();
employeeList.Add(new EmployeeInfo { EmployeeID = 1, EmployeeName = "大林", Salary = 1000, City = "合肥" });
employeeList.Add(new EmployeeInfo { EmployeeID = 2, EmployeeName = "小林", Salary = 1000, City = "合肥" });
employeeList.Add(new EmployeeInfo { EmployeeID = 3, EmployeeName = "张三", Salary = 1000, City = "合肥" });
employeeList.Add(new EmployeeInfo { EmployeeID = 4, EmployeeName = "李四", Salary = 1500, City = "天津" });
employeeList.Add(new EmployeeInfo { EmployeeID = 5, EmployeeName = "王五", Salary = 2000, City = "上海" });
return employeeList;
}
public List<EmployeeInfo> GetOtherEmployeeList()
{
List<EmployeeInfo> employeeList = new List<EmployeeInfo>();
employeeList.Add(new EmployeeInfo { EmployeeID = 6, EmployeeName = "赵六", Salary = 800, City = "北京" });
employeeList.Add(new EmployeeInfo { EmployeeID = 7, EmployeeName = "尤七", Salary = 2100, City = "武汉" });
employeeList.Add(new EmployeeInfo { EmployeeID = 8, EmployeeName = "马八", Salary = 1209, City = "海口" });
employeeList.Add(new EmployeeInfo { EmployeeID = 9, EmployeeName = "许九", Salary = 1600, City = "海口" });
employeeList.Add(new EmployeeInfo { EmployeeID = 10, EmployeeName = "代十", Salary = 2300, City = "海口" });
return employeeList;
}
public class EmployeeInfo
{
public int EmployeeID { set; get; }
public string EmployeeName { set; get; }
public int Salary { set; get; }
public int[] Cost { get; set; }
public string City { set; get; }
}
    
      因为这两个控件都支持多数据源绑定,所以我用了两个方法分别获取对象集合,分别是:    
       GetEmployeeList();    
       GetOtherEmployeeList();    
    
      接着,就要对相应的图表控件进行初始化和数据绑定操作了,首先是“区域图表控件”,其
代码如下:  
AreaSeries areaSeries1 = new AreaSeries();
areaSeries1.ItemsSource = GetEmployeeList();
areaSeries1.IndependentValueBinding = new System.Windows.Data.Binding("EmployeeID");
areaSeries1.DependentValueBinding = new System.Windows.Data.Binding("Salary");
AreaEmployeeList.Series.Add(areaSeries1);
AreaSeries areaSeries2 = new AreaSeries();
areaSeries2.ItemsSource = GetOtherEmployeeList();
areaSeries2.IndependentValueBinding = new System.Windows.Data.Binding("EmployeeID");
areaSeries2.DependentValueBinding = new System.Windows.Data.Binding("Salary");
areaSeries2.Foreground = new SolidColorBrush(Colors.Red);
AreaEmployeeList.Series.Add(areaSeries2);
#endregion
  
      上面代码依次声明了两个AreaSeries实例用于绑定两个数据源, 同时对第二个AreaSeries实
例指定了红色背景来加以区别。当然对于AreaSeries的声明也可以放在XAML中进行定义,形如: 
<chartingToolkit:Chart.Series>
<chartingToolkit:AreaSeries
Title="Particulate Levels"
IndependentValueBinding="{Binding EmployeeID}"
DependentValueBinding="{Binding Salary}"/>
chartingToolkit:Chart.Series>
chartingToolkit:Chart>
 
      注:我这样写只是想演示如何使用代码方式来初始化控件和绑定数据。
    
     上面是关于Area图,下面再看一下Bubble图的初始化方法,其实因为ToolKit中的图表设计使用
了统一的接口,因此不同的图表在具体实现时有些相似,下面的代码与上面的Area代码相差无几:
BubbleSeries bubbleSeries1 = new BubbleSeries();
bubbleSeries1.ItemsSource = GetEmployeeList();
bubbleSeries1.IndependentValueBinding = new System.Windows.Data.Binding("EmployeeID");
bubbleSeries1.DependentValueBinding = new System.Windows.Data.Binding("Salary");
bubbleSeries1.AnimationSequence = AnimationSequence.LastToFirst;
BubbleEmployeeList.Series.Add(bubbleSeries1);
BubbleSeries bubbleSeries2 = new BubbleSeries();
bubbleSeries2.ItemsSource = GetOtherEmployeeList();
bubbleSeries2.IndependentValueBinding = new System.Windows.Data.Binding("EmployeeID");
bubbleSeries2.DependentValueBinding = new System.Windows.Data.Binding("Salary");
BubbleEmployeeList.Series.Add(bubbleSeries2);
bubbleSeries1.AnimationSequence = AnimationSequence.FirstToLast;
#endregion
       大家看到了吧,唯一的区别就在BubbleSeries上,而不是Area图表的AreaSeries。
   
       最后补充一下,因为当前版本与之前我写的文章使用的版本不同,导致如果想向图表的X,Y轴
添加‘标题属性’所使用的类不同,在3.0里可用如下代码向X,Y轴绑定标题名称:
{
DisplayAxis dateAxis = new CategoryAxis { Orientation = AxisOrientation.X, Title = "雇员ID", FontStyle = FontStyles.Italic, ShowGridLines = true, FontSize = 14f };
AreaEmployeeList.Axes.Add(dateAxis);
DisplayAxis valueAxis = new CategoryAxis { Orientation = AxisOrientation.Y, Title = "薪水", FontStyle = FontStyles.Normal, ShowGridLines = true};
AreaEmployeeList.Axes.Add(valueAxis);
};
chartModifier(AreaEmployeeList);
     
       这样,其显示效果就会变成如下图所示(注:Y轴单位数值会从左侧变到右侧):