PointTemplate in Chart with SeriesDescriptor

[Daniel]

Hi, How can I set a PointTemplate to chart series, series are defined using SeriesDescriptor.
My goal is to show tooltips in each point of the series
I have tried the following but is not working
Thanks for your help.

<Grid.Resources>
              <DataTemplate x:Key="PointDataTemplate">
                <Ellipse Width="6" Height="6" />
            </DataTemplate>
</Grid.Resources>

<telerik:RadCartesianChart x:Name="MonitoringParameterChart" >
           <telerik:RadCartesianChart.Behaviors>
               <telerik:ChartTooltipBehavior HorizontalOffset="-17" VerticalOffset="-70"/>
           </telerik:RadCartesianChart.Behaviors>
           <telerik:RadCartesianChart.TooltipTemplate>
               <DataTemplate>
                   <Grid>
                       <Path Data="M-1236,-441 L-1208,-441 L-1208,-424 L-1228,-424 L-1230.5,-420 L-1233,-424 L-1236,-424 z"
                                       Stretch="Fill" Fill="#FFFFFFFF" Stroke="#FF767676" StrokeThickness="1" />
                       <TextBlock Margin="6,4,6,10" FontSize="11">
                                           <Run Text="{Binding Value, StringFormat=\{0:#########\}}"/>
                                           <LineBreak/>
                                           <Run Text="{Binding Category, StringFormat=\{0:dd MMM yyyy\}}"/>
                       </TextBlock>
                   </Grid>
               </DataTemplate>
           </telerik:RadCartesianChart.TooltipTemplate>
           <telerik:RadCartesianChart.SeriesProvider>
               <telerik:ChartSeriesProvider x:Name="MonitoringParametersSeriesProvider" Source="{Binding}">
                   <telerik:ChartSeriesProvider.SeriesDescriptors >
                       <telerik:CategoricalSeriesDescriptor ItemsSourcePath="Values" ValuePath="Value" CategoryPath="Time" >
                           <telerik:CategoricalSeriesDescriptor.Style>
                               <Style TargetType="telerik:LineSeries">
                                   <Setter Property="StrokeThickness" Value="1"/>
                                    <Setter Property="PointTemplate" Value="{StaticResource PointDataTemplate}" />
                               </Style>
                           </telerik:CategoricalSeriesDescriptor.Style>
                       </telerik:CategoricalSeriesDescriptor>
                   </telerik:ChartSeriesProvider.SeriesDescriptors>
               </telerik:ChartSeriesProvider>
           </telerik:RadCartesianChart.SeriesProvider>

       </telerik:RadCartesianChart>

[Daniel]

I found a thread that gave me the solution:

<Setter Property="PointTemplate" ><BR> <Setter.Value><BR>
<DataTemplate><BR> <Ellipse Width="6" Height="6" Fill="{Binding
Converter={StaticResource paletteConverter}}"/><BR> </DataTemplate><BR>
</Setter.Value><BR> </Setter>

public class PaletteConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            CategoricalDataPoint point = value as CategoricalDataPoint;
            LineSeries series = point.Presenter as LineSeries;
            RadCartesianChart chart = series.Chart as RadCartesianChart;
            int seriesIndex = chart.Series.IndexOf(series);
            return chart.Palette.GlobalEntries[seriesIndex].Fill;
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
           throw new NotImplementedException();
        }

    }

The only troblue is that I have more series than color in the palette.

[Pavel R. Pavlov]

Hello Daniel,

I am happy to hear that you have found an approach that achieves your requirement for custom PointTemplate. Regarding the number of the colors in a palette, if you need to extend the palette (to add more colors) you can take a look at the Creating Custom palettes article. Following it, you will be able to define custom colors that will be used to paint your series. This will allow you to control the number of the series with different colors.

Regards,
Pavel R. Pavlov
Telerik