A RotateTransform is defined by the following properties: Angle rotates an object by a specified angle about the point CenterX, CenterY.

When you use a RotateTransform, the transformation rotates the coordinate system for a particular object about the origin point for its frame of reference. Therefore, depending on the position of the object, it might not rotate in place (around its center). For example, if an object is positioned 200 units from 0 along the x-axis, a rotation of 30 degrees can swing the object 30 degrees along a circle that has a radius of 200, which is drawn around the origin. To rotate an object in place, set the CenterX and CenterY of the RotateTransform to the center of the object to rotate.

The local 0,0 for an object can be offset on a Canvas using Canvas..::.Left and Canvas..::.Top, but this does not count as a transform; the object retains its own local 0,0 in this case for transform purposes.

Multiple transforms can be applied with a TransformGroup.

Transforms can alter the display of text in your application to create a decorative effect. The following example shows text rotated 90 degrees using a RotateTransform.

The following example uses a RotateTransform to rotate text. An Angle value of 90 rotates the element 90 degrees clockwise.

<!-- Rotate the text 90 degrees using a RotateTransform. -->
<TextBlock Text="Rotated Text" FontSize="32" Foreground="Teal">
  <TextBlock.RenderTransform>
    <RotateTransform Angle="90" />
  </TextBlock.RenderTransform>
</TextBlock>

Transform objects can be accessed and manipulated by using code. One way to do this is to name the Transform and then access it by using its name. The following example shows how to increase the ScaleX and ScaleY property values of a ScaleTransform applied to a Rectangle every time the Rectangle is clicked.

Run this sample

<StackPanel>
  <Rectangle MouseLeftButtonDown="HandleMouseButtonDown"
    Width="50" Height="50" Fill="RoyalBlue">
    <Rectangle.RenderTransform>

      <!-- If you give the transform a name you can 
        access it easily from code. -->
      <ScaleTransform x:Name="myScaleTransform" />
    </Rectangle.RenderTransform>
  </Rectangle>
</StackPanel>

Private Sub HandleMouseButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    ' Increase ScaleX and ScaleY by 25%.
    myScaleTransform.ScaleX = (myScaleTransform.ScaleX * 1.25)
    myScaleTransform.ScaleY = (myScaleTransform.ScaleY * 1.25)
End Sub

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Reference

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