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How to: Skew an Element

This example shows how to use a SkewTransform to skew an element. A skew, which is also known as a shear, is a transformation that stretches the coordinate space in a non-uniform manner. One typical use of a SkewTransform is for simulating 3-D depth in 2-D objects.

Use the CenterX and CenterY properties to specify the center point of the SkewTransform.

Use the AngleX and AngleY properties to specify the skew angle of the x-axis and y-axis, and to skew the current coordinate system along these axes.

To predict the effect of a skew transformation, consider that AngleX skews x-axis values relative to the original coordinate system. Therefore, for an AngleX of 30, the y-axis rotates 30 degrees through the origin and skews the values in x- by 30 degrees from that origin. Likewise, an AngleY of 30 skews the y- values of the shape by 30 degrees from the origin. Note that this is not the same effect as translating (moving) the coordinate system by 30 degrees in x- or y-.

The following example applies a horizontal skew of 45 degrees to a Rectangle from a center point of (0,0).

<Rectangle 
  Height="50" Width="50" Fill="#CCCCCCFF" 
  Stroke="Blue" StrokeThickness="2"
  Canvas.Left="100" Canvas.Top="100">
  <Rectangle.RenderTransform>

     <!-- Applies a horizontal skew of 45 degrees 
          from a center point of (0,0). -->             
    <SkewTransform CenterX="0" CenterY="0" AngleX="45" AngleY="0" />
  </Rectangle.RenderTransform>
</Rectangle>

The following example applies a horizontal skew of 45 degrees to a Rectangle from a center point of (25,25).

<Rectangle Height="50" Width="50" Fill="#CCCCCCFF"
  Canvas.Left="100" Canvas.Top="100" 
  Stroke="Blue" StrokeThickness="2">
  <Rectangle.RenderTransform>

     <!-- Applies a horizontal skew of 45 degrees 
          from a center point of (25,25). -->  
    <SkewTransform CenterX="25" CenterY="25" AngleX="45" AngleY="0" />
  </Rectangle.RenderTransform>
</Rectangle>

The following example applies a vertical skew of 45 degrees to a Rectangle from a center point of (25,25).

<Rectangle Height="50" Width="50" Fill="#CCCCCCFF" 
  Stroke="Blue" StrokeThickness="2"
  Canvas.Left="100" Canvas.Top="100">
  <Rectangle.RenderTransform>

     <!-- Applies a vertical skew of 45 degrees 
          from a center point of (25,25). -->             
    <SkewTransform CenterX="25" CenterY="25" AngleX="0" AngleY="45" />
  </Rectangle.RenderTransform>
</Rectangle> 

The following illustration shows the different skews that are used in this example.

The three SkewTransform examples illustrated

SkewTransform examples

For the complete sample, see 2-D Transforms Sample.

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