Spider background label color

[Jeff Kershner]

I can't figure out how to make the background color of a spider label to be transparent.  I am using this for a palette:

chart.PaletteBrushes.Clear();
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 2, 123, 8)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 238, 192, 5)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 238, 97, 6)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 1, 240, 6)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 238, 240, 6)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 179, 181, 183)));
chart.PaletteBrushes.Add(new SolidColorBrush(Color.FromArgb(255, 237, 240, 242)));

chart.PaletteBrushes.Repeat = true;

Pie definition:

PieSeriesDefinition def = new PieSeriesDefinition();

def.RadiusFactor = 0.8;
def.LabelSettings.ShowConnectors = true;
def.LabelSettings.SpiderModeEnabled = true;
def.LabelSettings.LabelOffset = 20.0;
def.InteractivitySettings.HoverScope = InteractivityScope.Item;
def.InteractivitySettings.SelectionScope = InteractivityScope.Item;
def.InteractivitySettings.SelectionMode = ChartSelectionMode.Single;
pieSeries.Definition = def;

I can't find anywhere were I can set the brush for the spider label.

[Jeff Kershner]

Still waiting for an anwer for this?  Is this not possible?

[Sia]

Hello Jeff Kershner,

You need to re-template your labels as shown in this example. Please try it and let us know if further questions arise.

All the best,
Sia
the Telerik team

[Jeff Kershner]

From that example, it looks like I need to add a UserControl.Resources with a nested Style called CustomLabelStyle.  And then in the code behind do something like this:

RadChart1.DefaultSeriesDefinition.SeriesItemLabelStyle = this.Resources["CustomLabelStyle"] as Style;

Is that correct?  When I try to do that, I get an Unhandled exception.. Failed to create a System.Type from telerik:SeriesItemLabel.

I have the following namespace in the xaml:

xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"

[Sia]

Hi Jeff Kershner,

Exactly, just need to use a different namespace:

xmlns:telerikCharting="clr-namespace:Telerik.Windows.Controls.Charting;assembly=Telerik.Windows.Controls.Charting"

In that case the resource should be:

<Style x:Key="CustomLabelStyle" TargetType="telerikCharting:SeriesItemLabel">
    <Setter Property="HorizontalContentAlignment" Value="Center" />
    <Setter Property="Padding" Value="2,0" />
    <Setter Property="IsHitTestVisible" Value="False"/>
    <Setter Property="Template" >
        <Setter.Value>
            <ControlTemplate TargetType="telerikCharting:SeriesItemLabel">
                <Canvas>
                    <Polyline x:Name="PART_Connector"
                                Points="{TemplateBinding ConnectorPoints}"
                                Visibility="{TemplateBinding ConnectorVisibility}"
                                Style="{TemplateBinding ConnectorStyle}"
                                Stroke="{TemplateBinding Stroke}"
                                StrokeThickness="{TemplateBinding StrokeThickness}" />
                    <Border x:Name="PART_TextContainer"
                            Canvas.Left="{TemplateBinding TextContainerCanvasLeft}"
                            Canvas.Top="{TemplateBinding TextContainerCanvasTop}"
                            BorderBrush="{TemplateBinding Stroke}"
                            Background="Transparent">
                        <TextBlock TextAlignment="{TemplateBinding HorizontalContentAlignment}"
                                    Margin="{TemplateBinding Padding}"
                                    Foreground="Black"
                                    Text="{TemplateBinding Content}" />
                    </Border>
                </Canvas>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

and set it to the data series' definition:

dataSeries.Definition.SeriesItemLabelStyle = this.Resources["CustomLabelStyle"] as Style;

All the best,
Sia
the Telerik team