How to draw Shape exclusively inside Canvas

问题

I have a Shape inside Canvas, like this:

<ScrollViewer>

    <Border Height="342" Width="470" HorizontalAlignment="Left" 
        VerticalAlignment="Top" BorderThickness="3" BorderBrush="Black">

        <Canvas Background="White">
            <Rectangle Width="200" Height="200" Canvas.Left="103" 
                Canvas.Top="186" Fill="Red" />
        </Canvas>

    </Border>

</ScrollViewer>

Even if the Rectangle is a Canvas children it's draw outside Canvas limits, covering Border bottom border. How can I make the Rectangle is draw only inside Canvas limits, ensuring that the part of rectangle that lies beyond is not displayed?

Thanks.

回答1:

This is what the ClipToBounds property was made for:

<Canvas Background="White" ClipToBounds="True"> 
    <Rectangle Width="200" Height="200" Canvas.Left="103" Canvas.Top="186" Fill="Red" /> 
</Canvas> 

来源：https://stackoverflow.com/questions/10085229/how-to-draw-shape-exclusively-inside-canvas