Translate then Rotate
<UserControl x:Class='SilverlightApplication3.MainPage'
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:DesignWidth='640'
d:DesignHeight='480'>
<Canvas Height="200" Width="200">
<Polyline
Points="25,25 0,50 25,75 50,50 25,25 25,0" Stroke="Blue" StrokeThickness="10"
Canvas.Left="75" Canvas.Top="50">
<Polyline.RenderTransform>
<TransformGroup>
<TransformGroup.Children>
<TransformCollection>
<TranslateTransform X="50" Y="0" />
<RotateTransform CenterX="25" CenterY="50" Angle="45" />
</TransformCollection>
</TransformGroup.Children>
</TransformGroup>
</Polyline.RenderTransform>
</Polyline>
<Polyline Points="25,25 0,50 25,75 50,50 25,25 25,0" Stroke="Blue" StrokeThickness="10"
Opacity="0.25" Canvas.Left="75" Canvas.Top="50" />
</Canvas>
</UserControl>
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