Silverlight MatrixTransform理解

MatrixTransform的六个点如下图，这是本人的理解，有错误的请高手指明哈。。。

实例：

<Grid x:Name="LayoutRoot" Background="White">
        <Rectangle Width="200" Height="200" Stroke="Black" StrokeThickness="2">
            <Rectangle.Fill>
                <LinearGradientBrush>
                    <GradientStop Offset="0.0" Color="White"/>
                    <GradientStop Offset="1.0" Color="Black"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
            <Rectangle.RenderTransform>
                <MatrixTransform>
                    <MatrixTransform.Matrix>
                        <Matrix OffsetX="-50" OffsetY="100" M12="-0.5"/>
                    </MatrixTransform.Matrix>
                </MatrixTransform>
            </Rectangle.RenderTransform>
        </Rectangle>
        <Rectangle Width="200" Height="200" Stroke="Black" StrokeThickness="2">
            <Rectangle.Fill>
                <LinearGradientBrush>
                    <GradientStop Offset="0.0" Color="White"/>
                    <GradientStop Offset="1.0" Color="Black"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
            <Rectangle.RenderTransform>
                <MatrixTransform>
                    <MatrixTransform.Matrix>
                        <Matrix OffsetX="150" OffsetY="0" M12="0.5"/>
                    </MatrixTransform.Matrix>
                </MatrixTransform>
            </Rectangle.RenderTransform>
        </Rectangle>
        <Rectangle Width="200" Height="200" Stroke="Black" StrokeThickness="2">
            <Rectangle.Fill>
                <LinearGradientBrush>
                    <GradientStop Offset="0.0" Color="White"/>
                    <GradientStop Offset="1.0" Color="Black"/>
                </LinearGradientBrush>
            </Rectangle.Fill>
            <Rectangle.RenderTransform>
                <MatrixTransform>
                    <MatrixTransform.Matrix>
                        <Matrix OffsetX="150" OffsetY="200" M21="-1" M22="0.5" M12="0.5"/>
                    </MatrixTransform.Matrix>
                </MatrixTransform>
            </Rectangle.RenderTransform>
        </Rectangle>
    </Grid>

结果：