How to apply label formatting to trackball labels in WPF Chart (SfChart)?
You can customize the trackball label by using the TrackBallLabelTemplate property in WPF Chart (SfChart). The ChartPointInfo is used as a data context for this template. You can retrieve the X and Y values from ValueX and ValueY, respectively. A converter is used to format the trackball labels.
XAML
<chart:SfChart> <chart:SfChart.Resources> <local:LabelConverter x:Key="labelConverter"/> <DataTemplate x:Key="trackBallTemplate"> <Border BorderBrushn="Black” BorderThickness="1”> <Grid Height="30”> <Grid.ColumnDefinitions> <ColumnDefinition> <ColumnDefinition> <Grid.ColumnDefinitions/> <Rectangle Fill="White” Grid.ColumnSpan="2”/> <Ellipse Fill="Green” Margin="3” Height="20” Width="20”/> <TextBlock Margin="3”
Grid.Column="1”> Text="{Binding Converter="{StaticResource labelConverter }"}"/> <Grid/> <Border/> <DataTemplate/> <chart:SfChart.Resources/> <chart:SfChart.Behaviors> <chart:ChartTrackBallBehavior/> <chart:SfChart.Behaviors/> <chart:LineSeries TrackBallLabelTemplate="{Binding trackBallTemplate}" XBindingPath="Year"
YBindingPath="Count" ItemsSource="{Binding}"/> <chart:SfChart/>
C#
public class LabelConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var pointValue = value as ChartPointInfo;
double d = double.Parse(pointValue.ValueY.ToString());
return d.ToString("0.000000");
}
}
Output:
The following screenshot demonstrates customizing the trackball label information, where the ValueY is rounded to six decimal places.
Conclusion
I hope you enjoyed learning how to apply label formatting to trackball labels in WPF Chart.
You can refer to our WPF Chart feature tour page know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our WPF Chart Examples to understand how to create and manipulate data.
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