WPF 2D RenderTransform ScaleTransform Slider 바인딩 Canvas.ClipToBounds

<StackPanel Height="280" Width="250">
<Border BorderBrush="Black" BorderThickness="1" 
              Height="200" Width="200" Margin="20">
	<Canvas Height="200" Width="200" ClipToBounds="True">
	<!--ClipToBounds 내부 컨텐트를 켄버스안에만 표시 할것인지 설정-->
		<Canvas.RenderTransform>
		    <TransformGroup>
		        <ScaleTransform ScaleY="-1" />
		        <TranslateTransform Y="200" />
		    </TransformGroup>
		</Canvas.RenderTransform>
		<Line X1="0" Y1="0" X2="80" Y2="80" Stroke="Black" StrokeThickness="2">
		    <Line.RenderTransform>
		        <ScaleTransform  
			ScaleX="{Binding ElementName=slider,Path=Value}"  
			ScaleY="{Binding ElementName=slider,Path=Value}"/>
		    </Line.RenderTransform>
		</Line>
		<Rectangle Canvas.Top="100" Canvas.Left="30" 
                           Width="80" Height="40"  
                           Stroke="DarkRed"  
                           StrokeThickness="3">
		<Rectangle.RenderTransform>
			<ScaleTransform  
                                ScaleX="{Binding ElementName=slider,Path=Value}"  
                                ScaleY="{Binding ElementName=slider,Path=Value}"/>
		</Rectangle.RenderTransform>
		</Rectangle>
	</Canvas>
</Border>
<Slider Name="slider" Minimum="0" Maximum="10"  
         Value="1" TickPlacement="BottomRight"  
         TickFrequency="0.2"   IsSnapToTickEnabled="True"/>
</StackPanel>

reference : Practical WPF Graphics Programming