使用上文中所创建的代码,我们只要做很少的修改就可以让柱状图显示变成饼图,折线图或散点图。
好了,开始今天的正文。
首先,我们要新创建一个饼图的"Silverlight 控件",并将其命名为:PIESample.xaml
然后我们拷贝相应的ColumnSample.xaml,ColumnSample.xaml.cs中的相应代码到: PIESample.xaml 和 PIE-
Sample.xaml.cs文件中。接着我们修改PIESample.xaml.cs文件中的dataServiceClIEnt_GetEmployeeListCompleted
方法,修改后的结果如下:
voID dataServiceClIEnt_GetEmployeeListCompleted( object sender, GetEmployeeListCompletedEventArgs e)
{
ObservableCollection < EmployeeInfo > employeeList = e.Result;
Action < Chart > chartModifIEr = (chart) =>
{
Axis dateAxis = new Axis { OrIEntation = AxisOrIEntation.Horizontal, Title = " 雇员名称 " , FontStyle = FontStyles.normal, FontSize = 12f, ShowGrIDlines = true };
EmployeeChart.Axes.Add(dateAxis);
Axis valueAxis = new Axis { OrIEntation = AxisOrIEntation.Vertical, Title = " 薪水 " , Minimum = - 1000 , Maximum = 3000 , ShowGrIDlines = true };
EmployeeChart.Axes.Add(valueAxis);
};
chartModifIEr(EmployeeChart);
PIESerIEs serIEs = new PIESerIEs();
serIEs.ItemsSource = employeeList;
serIEs.IndependentValueBinding = new System.windows.Data.Binding( " Employeename " );
serIEs.DependentValueBinding = new System.windows.Data.Binding( " Salary " );
serIEs.AnimationSequence = AnimationSequence.LastToFirst;
EmployeeChart.SerIEs.Add(serIEs);
}
现在,我们运行一下这个DEMO,看一下效果:
当然如果大家对Chart控件中的数据显示颜色不满意,也可以按我们自己的想法“自定义颜色”,比如我们在
Xaml中定义下面的类型
< UserControl.Resources >
< samples:StylePalette x:Key ="colorCustomStyle" >
< Style targettype ="Control" >
< Setter Property ="Background" Value ="Yellow" />
< Setter Property ="borderBrush" Value ="Black" />
</ Style >
< Style targettype ="Control" >
< Setter Property ="Background" Value ="Purple" />
< Setter Property ="borderBrush" Value ="Black" />
</ Style >
</ samples:StylePalette >
</ UserControl.Resources >
注意:StylePalette类型声明如下:
public partial class StylePalette : Collection < Style >
{
public StylePalette(){}
}
这样,当我们就可以在cs文件中使用该样式信息了,如下:
PIESerIEs serIEs = new PIESerIEs();
serIEs.ItemsSource = employeeList;
serIEs.IndependentValueBinding = new System.windows.Data.Binding( " Employeename " );
serIEs.DependentValueBinding = new System.windows.Data.Binding( " Salary " );
// 绑定了该样式
serIEs.StylePalette = this .Resources[ " colorCustomStyle " ] as Collection < Style > ;
serIEs.AnimationSequence = AnimationSequence.LastToFirst;
现在我们再看一下其运行效果:
可以看出,我们只要将ColumnSerIEs换成PIESerIEs,其它的代码一行不动,就将柱状图显示成了饼图,
是不是很方便,呵呵。
当然在饼图中也支持直接在Xaml中进行属性声明绑定,比如:
< charting:Chart Title ="Xaml绑定" x:name ="FunctionSerIEsSample" borderBrush ="Gray" margin ="5" >
< charting:Chart.SerIEs >
< charting:PIESerIEs
ItemsSource =" {Binding PugetSound, Source={StaticResource City}} "
IndependentValueBinding =" {Binding name} "
DependentValueBinding =" {Binding Population} "
IsSelectionEnabled ="True"
SelectionChanged ="barSerIEs_SelectionChanged" StylePalette =" {StaticResource colorCustomStyle} "
Template =" {StaticResource CustomTemplate} " >
</ charting:PIESerIEs >
</ charting:Chart.SerIEs >
</ charting:Chart >
另外就是饼图支持鼠标选择事件,比如当我们使用鼠标选中饼图中的某一显示区域时,我们可以将该区
域的详细信息显示出来。为了实现这个效果,我们将下面的代码加入了PIESample.Xaml中:
< controls:DockPanel LastChildFill ="False" controls:DockPanel.Dock ="Right" >
< StackPanel x:name ="informationPanel" controls:DockPanel.Dock ="top" margin ="5" >
< TextBlock Text ="Selected City Details" FontWeight ="Bold" />
< StackPanel OrIEntation ="Horizontal" >
< TextBlock Text ="name: " />
< TextBlock Text =" {Binding name} " />
</ StackPanel >
< StackPanel OrIEntation ="Horizontal" >
< TextBlock Text ="Population: " />
< TextBlock Text =" {Binding Population} " />
</ StackPanel >
</ StackPanel >
< button Content ="取消选中" Click ="Unselect_Click" margin ="5" controls:DockPanel.Dock ="Bottom" />
</ controls:DockPanel >
这里,我们只要在PIESample.Xaml.cs文件中编写事件barSerIEs_SelectionChanged处理代码即可:
private voID barSerIEs_SelectionChanged( object sender, SelectionChangedEventArgs e)
{
informationPanel.DataContext = ( 1 <= e.AddedItems.Count) ? e.AddedItems[ 0 ] : null ;
}
private voID Unselect_Click( object sender, System.windows.RoutedEventArgs e)
{
(FunctionSerIEsSample.SerIEs[ 0 ] as PIESerIEs).SelectedItem = null ;
}
下面看一下运行效果:
这样当我们参照之前讲过的将柱状图转成饼图的方法将所有的ColumnSerIEs修改为“PIESerIEs”之后,
我们会看到下面的显示效果:
其实看到这里,相信大家会举一返三了,下面要说的“折线图”,“散点图”要如何绘制了。不错,对
于折线图使用的SerIEs为“lineserIEs”,而散点图使用的是“ScatterSerIEs”。不过有一点就是这两个
图中的X,Y轴的数据绑定类型要做一下转换,因为之前我们使用的X轴是Employeename,Y轴使用的是
Salary.我们要修改的是X轴,新绑定的是EmployeeID,原因我猜是这两种图表要求XY两个轴只能是数
值型或日期型所致。
下面以dataServiceClIEnt_GetEmployeeListCompleted方法为例,看一下最终的修改结果:
voID dataServiceClIEnt_GetEmployeeListCompleted( object sender, ShowGrIDlines = true };
EmployeeChart.Axes.Add(valueAxis);
};
chartModifIEr(EmployeeChart);
lineserIEs serIEs = new lineserIEs();
serIEs.ItemsSource = employeeList;
serIEs.IndependentValueBinding = new System.windows.Data.Binding( " EmployeeID " );
serIEs.DependentValueBinding = new System.windows.Data.Binding( " Salary " );
EmployeeChart.SerIEs.Add(serIEs);
}
这样当我们运行该DEMO(linesample.xaml)时,显示的效果如下图:
当然“折线图”也支持多数据源绑定,比如下面的代码就演示了同时绑定数据源WidgetPopularity,
GizmoPopularity的图表:
< charting:Chart Title ="Typical Use" >
< charting:Chart.SerIEs >
< charting:lineserIEs IsSelectionEnabled ="True" Title ="Widget Popularity"
ItemsSource =" {StaticResource WidgetPopularity} " IndependentValueBinding =" {Binding Date} "
DependentValueBinding =" {Binding Percent} " />
< charting:lineserIEs IsEnabled ="True" Title ="Gizmo Popularity"
ItemsSource =" {StaticResource GizmoPopularity} " IndependentValueBinding =" {Binding Date} "
DependentValueBinding =" {Binding Percent} " />
</ charting:Chart.SerIEs >
</ charting:Chart >
显示如下图:
当做完所有必要的修改之后,最终linesample.xaml的运行效果:
同时,参考将“柱状图”转成“折线图”的过程,我们将“柱状图”转成“散点图”,这里不再多做说明了,做
完相应转换后,我们运行一下源码包中的ScatterSample.xaml,看一下效果:
看到这里,相信有一些朋友要说了,通过将现有的SerIEs替换成另一种SerIEs就可以对图表做出一番变化,那我
能不能定制自己的SerIEs呢?答案是肯定的,在Toolkit的Sample代码中就有这个示例,为了让大家阅读方便,我已将
这块代码复制到了本DEMO示例中,大家看一下CustomSerIEs下的两个文件SampleFunctionTypeConverter.cs
和FunctionSerIEs.cs,即可。
最终的运行效果(CustomSerIEsSample.xaml)如下:
好了,今天的内容就先到这里了,源码下载,请点击这里。
原文链接: http://www.cnblogs.com/daizhj/archive/2009/01/15/1376295.html
作者: daizhj,代震军
Tags: silverlight,chart,图表,柱状图,Column,bar,饼图,PIE,line,散点图,Scatter
网址: http://daizhj.cnblogs.com/
在微软的Silverlight 开源控件项目: Silverlight Toolkit 总结
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