Avalonia/samples/RenderDemo/Pages/GeometryHitTestingPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="RenderDemo.Pages.GeometryHitTestingPage">
  <DockPanel>

    <StackPanel DockPanel.Dock="Top"
                Margin="16"
                Spacing="4">
      <TextBlock x:Name="Status" />
      <StackPanel Orientation="Horizontal"
                  Spacing="8">
        <TextBlock Text="Stroke thickness:"
                   VerticalAlignment="Center" />
        <Slider x:Name="StrokeThickness"
                Width="240"
                Minimum="1"
                Maximum="40"
                Value="12"
                TickFrequency="1"
                IsSnapToTickEnabled="True" />
        <TextBlock Text="{Binding #StrokeThickness.Value}"
                   VerticalAlignment="Center" />
      </StackPanel>
    </StackPanel>

    <Grid x:Name="Scene"
          Background="Transparent"
          Cursor="None">
      <Ellipse x:Name="Ellipse"
               Margin="80,50,0,0"
               HorizontalAlignment="Left"
               VerticalAlignment="Top"
               Width="180"
               Height="120"
               Fill="#3B82F6"
               Stroke="#1E3A8A"
               StrokeThickness="{Binding #StrokeThickness.Value}" />

      <Rectangle x:Name="Rectangle"
                 Margin="0,60,50,0"
                 HorizontalAlignment="Right"
                 VerticalAlignment="Top"
                 Width="180"
                 Height="120"
                 RadiusX="12"
                 RadiusY="12"
                 Fill="#22C55E"
                 Stroke="#14532D"
                 StrokeThickness="{Binding #StrokeThickness.Value}" />

      <Path x:Name="Star"
            Margin="0,0,50,50"
            HorizontalAlignment="Right"
            VerticalAlignment="Bottom"
            Width="180"
            Height="180"
            Stretch="Uniform"
            Data="M 50,0 L 61,35 L 98,35 L 68,57 L 79,91 L 50,70 L 21,91 L 32,57 L 2,35 L 39,35 Z"
            Fill="#F43F5E"
            Stroke="#7F1D1D"
            StrokeThickness="{Binding #StrokeThickness.Value}" />

      <Path x:Name="Probe"
            Stretch="None"
            IsVisible="False"
            IsHitTestVisible="False"
            Fill="#66FACC15"
            Stroke="#CA8A04"
            StrokeThickness="3" />
    </Grid>
  </DockPanel>

</UserControl>