Can you use Simple Filtering from the code behind?

[chris]

Hello everyone, 

I was the Simple filtering for a RadChart that telerik has in it's examples and could not get it working from the code behind. I got the filtering working if I hard code the datapoints in the xaml document, but not if I randomly generate them from the code. I know I am missing how to bind the ViewModel and give it the visibility method in the code, I believe that is all I am missing. Any thoughts?

Xaml Code:

<Window.Resources>
        <example:ExampleViewModel x:Key="ViewModel" />
        <Style x:Key="CustomLegendItemStyle" TargetType="telerik:ChartLegendItem">
            <Setter Property="Foreground" Value="Black" />
            <Setter Property="Template" >
                <Setter.Value>
                    <ControlTemplate TargetType="telerik:ChartLegendItem">
                        <Grid x:Name="PART_MainContainer" HorizontalAlignment="Stretch" VerticalAlignment="Top" Margin="0,0,5,0">
                            <Path x:Name="PART_LegendItemMarker"
                                  Height="20"
                                  Width="*"
                                  Style="{TemplateBinding ItemStyle}"
                                  Stretch="Fill">
                                <Path.Data>
                                    <PathGeometry x:Name="PART_ItemMarkerGeometry" />
                                </Path.Data>
                            </Path>
                            <CheckBox IsChecked="True"
                                      VerticalAlignment="Center"
                                      Margin="2,0"
                                      Content="{TemplateBinding Label}"
                                      Foreground="{TemplateBinding Foreground}"
                                      Command="{Binding Path=ChangeSeriesVisibilityCommand, Source={StaticResource ViewModel}}"
                                      CommandParameter="{TemplateBinding Label}"
                                      />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
            <telerik:RadChart x:Name="RadChart1">
                <telerik:RadChart.DefaultView>
                    <telerik:ChartDefaultView ChartLegendPosition="Top">
                        <telerik:ChartDefaultView.ChartLegend>
                            <telerik:ChartLegend x:Name="PrimaryLegend" Header="Click on country to hide/show:" LegendItemMarkerShape="Square" LegendItemStyle="{StaticResource CustomLegendItemStyle}" Foreground="Black" HeaderFontWeight="Normal" FontFamily="Segoe UI" />
                        </telerik:ChartDefaultView.ChartLegend>
                        <telerik:ChartDefaultView.ChartArea>
                            <telerik:ChartArea Padding="5,10,20,5" LabelFormatBehavior="None" LegendName="PrimaryLegend" />
                    </telerik:ChartDefaultView>
                </telerik:RadChart.DefaultView>
            </telerik:RadChart>
        <TextBlock Grid.Row="1" x:Name="sourceText" TextAlignment="Right" Text="Source: Eurostat" FontSize="10" Foreground="{Binding Source={StaticResource ViewModel}, Path=ApplicationThemeAwareForeground}" />
    </Grid>
    </Window>

Code behind:

Random rnd = new Random();
        public Example()
        {
            this.InitializeComponent();

            var ds = new DataSeries();
            for (var x = 1; x <= 14; ++x)
            {
                ds.Definition = new LineSeriesDefinition();
                ds.Definition.ItemLabelFormat = "0.#";
                ds.Definition.Visibility = SeriesVisibility.Visible;
                ds.LegendLabel = x.ToString();
                var dp = new DataPoint { YValue = this.rnd.Next(10) + 1 };

                if (x == 3 || x == 7)
                {
                    dp.IsEmpty = true;
                }
                ds.Add(dp);
            }

            this.RadChart1.DefaultView.ChartArea.DataSeries.Add(ds);
        }

[Ves]

Hi Chris,

Filtering, as well as other data manipulation features in RadChart, like sorting and sampling, are only available in databound scenarios. You will have to configure the series mappings in the chart, build a collection of objects and assign it to RadChart.ItemsSource property. Then you will be able to take advantage of the built-in filtering.

Best regards,
Ves
the Telerik team