CanvasClip - Canvas영역에서 일부분만 잘라내어 보여주기

[FrmCanvasClip.xaml]

<UserControl x:Class="RiaCanvasClip.FrmCanvasClip"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    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:DesignHeight="300" d:DesignWidth="400">

    <Canvas x:Name="RootLayout" Width="50" Height="50" Background="Blue">

        <Canvas.Clip>

            <RectangleGeometry Rect="0,0,50,50"></RectangleGeometry>

        </Canvas.Clip>

        <Ellipse Width="100" Height="100" Fill="red">

        </Ellipse>

    </Canvas>   

</UserControl>