How to customize the individual appearance of the WPF Bar Chart (SfChart)?
This article describes how to change the individual appearance of a bar in WPF Chart.
Solution 1: This KB article explains how to change the color for a specific data point in a chart.
Solution 2: You can also customize the interior color of the particular segment based on the respective Y value by using the converter in the CustomTemplate property of ColumnSeries as demonstrated in the following code example. A detailed explanation of this appearance customization can be found in this user documentation page.
[XAML]
<Grid> <Grid.DataContext> <local:ViewModel></local:ViewModel> </Grid.DataContext> <Grid.Resources> <local:InteriorConverter x:Key="interiorConverter"></local:InteriorConverter> </Grid.Resources> <chart:SfChart Margin="10"> <chart:SfChart.PrimaryAxis> <chart:CategoryAxis LabelFormat="yyyy"></chart:CategoryAxis> </chart:SfChart.PrimaryAxis>
<chart:SfChart.SecondaryAxis> <chart:NumericalAxis></chart:NumericalAxis> </chart:SfChart.SecondaryAxis>
<chart:ColumnSeries XBindingPath="Year" YBindingPath="India" ItemsSource="{Binding DataPoints}">
<chart:ColumnSeries.CustomTemplate> <DataTemplate> <Canvas> <Rectangle Fill="{Binding Converter={StaticResource interiorConverter}}" Height="{Binding Height}" Width="{Binding Width}" Canvas.Left="{Binding RectX}" Canvas.Top="{Binding RectY}"></Rectangle> </Canvas> </DataTemplate> </chart:ColumnSeries.CustomTemplate>
<chart:ColumnSeries.AdornmentsInfo> <chart:ChartAdornmentInfo LabelPosition="Center" SegmentLabelContent="LabelContentPath" AdornmentsPosition="TopAndBottom" ShowLabel="True"> <chart:ChartAdornmentInfo.LabelTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <Label Content="{Binding Item.India}" Foreground="White" FontSize="11"></Label> </StackPanel> </DataTemplate> </chart:ChartAdornmentInfo.LabelTemplate> </chart:ChartAdornmentInfo> </chart:ColumnSeries.AdornmentsInfo> </chart:ColumnSeries> </chart:SfChart> </Grid>
[C#]
public class ViewModel
{
public ViewModel()
{
this.DataPoints = new ObservableCollection<Model>();
DateTime year = new DateTime(2005, 5, 1);
DataPoints.Add(new Model() { Year = year.AddYears(1), India = 28, Germany = 31, England = 36, France = 39 });
DataPoints.Add(new Model() { Year = year.AddYears(2), India = 25, Germany = 28, England = 32, France = 36 });
DataPoints.Add(new Model() { Year = year.AddYears(3), India = 26, Germany = 30, England = 34, France = 40 });
DataPoints.Add(new Model() { Year = year.AddYears(4), India = -27, Germany = 36, England = 41, France = 44 });
DataPoints.Add(new Model() { Year = year.AddYears(5), India = -32, Germany = 36, England = 42, France = 45 });
DataPoints.Add(new Model() { Year = year.AddYears(6), India = 35, Germany = 39, England = 42, France = 48 });
DataPoints.Add(new Model() { Year = year.AddYears(7), India = -30, Germany = 38, England = 43, France = 46 });
}
public ObservableCollection<Model> DataPoints { get; set; }
}
public class Model
{
public DateTime Year { get; set; }
public double India { get; set; }
public double Germany { get; set; }
public double England { get; set; }
public double France { get; set; }
}
public class InteriorConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var ydata = (value as ColumnSegment).YData;
Brush interior;
interior = ydata > 0 ?
new SolidColorBrush(Colors.Green) :
new SolidColorBrush(Colors.Red);
return interior;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}Output
For more details, please refer to the project on GitHub.
See Also:
Series customization in WPF SfChart.
How-to-customize-the-chart-series-in-WPF-SfChart?
Conclusion
I hope you enjoyed learning how to customize the individual appearance of the WPF Bar 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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