WinRTXamlToolkit.Controls.DataVisualizationで値Xに直線を描く方法は？

Question

私は以下のコードで棒グラフを作成しましたが、下の図のようにX値に赤い線を追加したいと思います。これは可能ですか？もしそうなら、私はこれをどのように達成できますか？

<charting:Chart x:Name="BarChart" HorizontalAlignment="Left" VerticalAlignment="Top" Visibility="Visible" Width="280" Height="500" Margin="-5,-35,0,20" FontSize="10"> 
       <charting:Chart.LegendStyle> 
        <Style TargetType="datavis:Legend"> 
         <Setter Property="Width" Value="0"/> 
        </Style> 
       </charting:Chart.LegendStyle> 
       <charting:BarSeries Visibility="Visible"/> 
       <charting:Chart.Palette> 
        <charting:ResourceDictionaryCollection> 
         <ResourceDictionary> 
          <SolidColorBrush x:Key="Background" Color="#2574a9" /> 
          <Style x:Key="DataPointStyle" TargetType="Control"> 
           <Setter Property="Background" Value="{StaticResource Background}" /> 
          </Style> 
          <Style x:Key="DataShapeStyle" TargetType="Shape"> 
           <Setter Property="Stroke" Value="{StaticResource Background}" /> 
           <Setter Property="StrokeThickness" Value="2" /> 
           <Setter Property="StrokeMiterLimit" Value="1" /> 
           <Setter Property="Fill" Value="{StaticResource Background}" /> 
          </Style> 
         </ResourceDictionary> 
        </charting:ResourceDictionaryCollection> 
       </charting:Chart.Palette> 
      </charting:Chart> 

Answer 1

私は特別なX値に応じて行を追加するdemoを書きました。この機能は、特別なX値の位置を計算し、Line要素を追加することによって実装されます。それは動作し、あなたはテストすることができます。 XAMLコード

<Grid x:Name="rootgrid" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> 
    <charting:Chart 
     x:Name="BarChart" 
     Title="Bar Chart" 
     Width="800" 
     Height="400"> 
     <charting:BarSeries 
      x:Name="bar" 
      Title="Population" 
      DependentValueBinding="{Binding Value}" 
      IndependentValueBinding="{Binding Name}" 
      IsSelectionEnabled="True" /> 
    </charting:Chart> 
    <StackPanel x:Name="InsertLine" > 
     <TextBox x:Name="txtnumber" Header="The location for insert a new line" /> 
     <Button 
      x:Name="getaxi" 
      Click="getaxi_Click" 
      Content="Insert the new line" /> 
    </StackPanel> 
</Grid> 

コードそんなに

public sealed partial class BarChat : Page 
{ 
    private Random _random = new Random(); 
    private LinearAxis linearaxis; 
    private CategoryAxis categoryaxis; 
    private double linearaximaximum; 
    private double linearaximinimum; 
    private Line newline; 
    public BarChat() 
    { 
     this.InitializeComponent(); 
     Window.Current.SizeChanged += Current_SizeChanged; ; 
     var items1 = new List<NameValueItem>(); 
     for (int i = 0; i < 3; i++) 
     { 
      items1.Add(new NameValueItem { Name = "Name" + i, Value = _random.Next(1, 100) }); 
     } 
     this.RunIfSelected(this.BarChart,() => ((BarSeries)this.BarChart.Series[0]).ItemsSource = items1); 

    } 

    private void Current_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e) 
    { 
     if (rootgrid.Children.Contains(newline)) 
     { 
      clearline(); 
      if (txtnumber.Text != null) 
      { 
       var insertvalue = Convert.ToDouble(txtnumber.Text); 
       positionline(insertvalue); 
      } 
     } 
    } 

    public void barchartinihital() 
    { 
     var Actualaxes = BarChart.ActualAxes; 
     linearaxis = Actualaxes[1] as LinearAxis; 
     categoryaxis = Actualaxes[0] as CategoryAxis; 
     linearaximaximum = Convert.ToDouble(linearaxis.ActualMaximum); 
     linearaximinimum = Convert.ToDouble(linearaxis.ActualMinimum); 
    } 


    private void RunIfSelected(UIElement element, Action action) 
    { 
     action.Invoke(); 
    } 

    private async void getaxi_Click(object sender, RoutedEventArgs e) 
    { 
     clearline(); 
     barchartinihital();   
     if (txtnumber.Text != null) 
     {     
      double insertvalue = Convert.ToDouble(txtnumber.Text); 
      if (insertvalue > linearaximaximum || insertvalue < linearaximinimum) 
      { 
       await new Windows.UI.Popups.MessageDialog("Please input a value in chart arrange").ShowAsync(); 
      } 
      else 
      { 
       positionline(insertvalue); 
      } 
     } 
    } 
    public void positionline(double insertvalue) 
    { 

     var interval = linearaxis.ActualInterval; 
     double perinterval = Convert.ToDouble(linearaxis.ActualWidth/(linearaximaximum - linearaximinimum)); 

     var lineX = perinterval * (insertvalue - linearaximinimum); 
     var lineheight = categoryaxis.ActualHeight; 

     var ttv = bar.TransformToVisual(Window.Current.Content); 
     Point screenCoords = ttv.TransformPoint(new Point(0, 0)); 

     var chartx = screenCoords.X; 
     var charty = screenCoords.Y; 

     newline = new Line(); 
     newline.X1 = Convert.ToDouble(lineX) + chartx; 
     newline.X2 = Convert.ToDouble(lineX) + chartx; 
     newline.Y1 = charty; 
     newline.Y2 = charty + lineheight; 
     newline.Stroke = new SolidColorBrush(Colors.Red); 
     newline.StrokeThickness = 2; 
     rootgrid.Children.Add(newline); 

    } 
    public void clearline() 
    { 
     if (rootgrid.Children.Contains(newline)) 
     { 
      { 
       rootgrid.Children.Remove(newline); 
      } 

     } 
    } 

}