Categorical Axis

The categorical axis displays a set of categories. The values for each category do not define the order in which they appear. Here is an example of a categorical axis with a few data points.

Example 1: Chart with categorical axis

<telerik:RadCartesianChart> 
    <telerik:RadCartesianChart.HorizontalAxis> 
        <telerik:CategoricalAxis/> 
    </telerik:RadCartesianChart.HorizontalAxis> 
 
    <telerik:RadCartesianChart.VerticalAxis> 
        <telerik:LinearAxis/> 
    </telerik:RadCartesianChart.VerticalAxis> 
 
    <telerik:RadCartesianChart.Series> 
        <telerik:BarSeries> 
            <telerik:BarSeries.DataPoints> 
                <telerik:CategoricalDataPoint Category="Soda" Value="20"/> 
                <telerik:CategoricalDataPoint Category="Beer" Value="40"/> 
                <telerik:CategoricalDataPoint Category="Milk" Value="35"/> 
                <telerik:CategoricalDataPoint Category="Water" Value="40"/> 
            </telerik:BarSeries.DataPoints> 
        </telerik:BarSeries> 
    </telerik:RadCartesianChart.Series> 
</telerik:RadCartesianChart> 

Figure 1: Result from Example 1

If a data point category is not defined, the series will set a category automatically. The category will be a numeric value determined by the position of the data point in the data source. For example, "1", "2", "3",etc."

Example 2: Chart with no category defined for datapoints

<telerik:RadCartesianChart x:Name="chart"> 
   <telerik:RadCartesianChart.HorizontalAxis> 
      <telerik:CategoricalAxis/> 
   </telerik:RadCartesianChart.HorizontalAxis> 
 
   <telerik:RadCartesianChart.VerticalAxis> 
      <telerik:LinearAxis/> 
   </telerik:RadCartesianChart.VerticalAxis> 
 
   <telerik:RadCartesianChart.Series> 
      <telerik:LineSeries Stroke="Orange" 
                        StrokeThickness="2"> 
      <telerik:LineSeries.DataPoints> 
         <telerik:CategoricalDataPoint Value="20"/> 
         <telerik:CategoricalDataPoint Value="40"/> 
         <telerik:CategoricalDataPoint Value="35"/> 
         <telerik:CategoricalDataPoint Value="40"/> 
         <telerik:CategoricalDataPoint Value="30"/> 
         <telerik:CategoricalDataPoint Value="50"/> 
      </telerik:LineSeries.DataPoints> 
   </telerik:LineSeries> 
</telerik:RadCartesianChart.Series> 

Figure 2: Result from Example 2

You can customize the CategoricalAxis by utilizing its LabelTemplate property. Here is a simple implementation of a rectangle added in the LabelTemplate.

Example 3: CategoricalAxis with LabelTemplate

<Grid> 
    <Grid.Resources> 
        <DataTemplate x:Key="LabelTemplate" DataType="{x:Type telerik:CategoricalAxis}"> 
            <StackPanel Orientation="Horizontal"> 
                <Rectangle Fill="Red" Width="5" Height="5" /> 
                <TextBlock Text="{Binding}" Margin="5 0 0 0" /> 
            </StackPanel> 
        </DataTemplate> 
    </Grid.Resources> 
 
    <telerik:RadCartesianChart x:Name="RadChart"> 
        <telerik:RadCartesianChart.HorizontalAxis> 
            <telerik:CategoricalAxis LabelTemplate="{StaticResource LabelTemplate}" /> 
        </telerik:RadCartesianChart.HorizontalAxis> 
 
        <telerik:RadCartesianChart.VerticalAxis> 
            <telerik:LinearAxis/> 
        </telerik:RadCartesianChart.VerticalAxis> 
 
        <telerik:RadCartesianChart.Series> 
            <telerik:BarSeries> 
 
                <telerik:BarSeries.DataPoints> 
                    <telerik:CategoricalDataPoint Category="Soda" Value="20"/> 
                    <telerik:CategoricalDataPoint Category="Beer" Value="40"/> 
                    <telerik:CategoricalDataPoint Category="Milk" Value="35"/> 
                    <telerik:CategoricalDataPoint Category="Water" Value="40"/> 
                </telerik:BarSeries.DataPoints> 
 
            </telerik:BarSeries> 
        </telerik:RadCartesianChart.Series> 
    </telerik:RadCartesianChart> 
</Grid> 

Figure 3: Result from Example 3

See Also

• Getting Started
• Axes
• Axis Smart Labels