Artemis/src/Artemis.UI/Styles/Visualizers/LedVisualizer.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:Artemis.UI.Controls.Visualizers"
                    xmlns:converters="clr-namespace:Artemis.UI.Converters">

    <converters:ColorToSolidColorBrushConverter x:Key="ConverterColorToSolidColorBrush" />

    <ControlTemplate x:Key="ControlTemplateLedRectangle" TargetType="{x:Type controls:LedVisualizer}">
        <Border VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <Border.Background>
                <ImageBrush AlignmentX="Center" AlignmentY="Center"
                            Stretch="Fill"
                            ImageSource="{Binding Led.Image, RelativeSource={RelativeSource TemplatedParent}}" />
            </Border.Background>

            <Rectangle VerticalAlignment="Stretch"
                       HorizontalAlignment="Stretch"
                       Opacity="0.5"
                       Stroke="{TemplateBinding BorderBrush}"
                       StrokeThickness="1"
                       Fill="{TemplateBinding Background}" />
        </Border>
    </ControlTemplate>

    <ControlTemplate x:Key="ControlTemplateLedCircle" TargetType="{x:Type controls:LedVisualizer}">
        <Border VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <Border.Background>
                <ImageBrush AlignmentX="Center" AlignmentY="Center"
                            Stretch="Fill"
                            ImageSource="{Binding Led.Image, RelativeSource={RelativeSource TemplatedParent}}" />
            </Border.Background>

            <Ellipse VerticalAlignment="Stretch"
                     HorizontalAlignment="Stretch"
                     Opacity="0.5"
                     Stroke="{TemplateBinding BorderBrush}"
                     StrokeThickness="1"
                     Fill="{TemplateBinding Background}" />
        </Border>
    </ControlTemplate>

    <ControlTemplate x:Key="ControlTemplateLedCustom" TargetType="{x:Type controls:LedVisualizer}">
        <Border x:Name="Border" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <Border.Background>
                <ImageBrush AlignmentX="Center" AlignmentY="Center"
                            Stretch="Fill"
                            ImageSource="{Binding Led.Image, RelativeSource={RelativeSource TemplatedParent}}" />
            </Border.Background>

            <Path Opacity="0.5"
                  Clip="{Binding Data, RelativeSource={RelativeSource Self}}"
                  Stroke="{TemplateBinding BorderBrush}"
                  StrokeThickness="2"
                  Fill="{TemplateBinding Background}">
                <Path.Data>
                    <PathGeometry Figures="{Binding Led.ShapeData, RelativeSource={RelativeSource TemplatedParent}}">
                        <PathGeometry.Transform>
                            <ScaleTransform ScaleX="{Binding ActualWidth, ElementName=Border}"
                                            ScaleY="{Binding ActualHeight, ElementName=Border}" />
                        </PathGeometry.Transform>
                    </PathGeometry>
                </Path.Data>
            </Path>
        </Border>
    </ControlTemplate>

    <Style x:Key="StyleLedVisualizer" TargetType="{x:Type controls:LedVisualizer}">
        <Setter Property="Width" Value="{Binding Led.LedRectangle.Size.Width, RelativeSource={RelativeSource Self}}" />
        <Setter Property="Height" Value="{Binding Led.LedRectangle.Size.Height, RelativeSource={RelativeSource Self}}" />
        <Setter Property="Canvas.Left"
                Value="{Binding Led.LedRectangle.Location.X, RelativeSource={RelativeSource Self}}" />
        <Setter Property="Canvas.Top"
                Value="{Binding Led.LedRectangle.Location.Y, RelativeSource={RelativeSource Self}}" />

        <Setter Property="BorderBrush" Value="#000000" />
        <Setter Property="Background"
                Value="{Binding Led.Color, RelativeSource={RelativeSource Self}, 
                                                      Converter={StaticResource ConverterColorToSolidColorBrush}}" />

        <Setter Property="Template" Value="{StaticResource ControlTemplateLedRectangle}" />

        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="BorderBrush" Value="#FFFFFF" />
            </Trigger>

            <DataTrigger Binding="{Binding Led.Shape, RelativeSource={RelativeSource Self}}" Value="Circle">
                <Setter Property="Template" Value="{StaticResource ControlTemplateLedCircle}" />
            </DataTrigger>

            <DataTrigger Binding="{Binding Led.Shape, RelativeSource={RelativeSource Self}}" Value="Custom">
                <Setter Property="Template" Value="{StaticResource ControlTemplateLedCustom}" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
    <Style TargetType="{x:Type controls:LedVisualizer}" BasedOn="{StaticResource StyleLedVisualizer}" />

</ResourceDictionary>