Rotates the transformation matrix of this AnnObject around a point.
angle
The angle (extent) of the rotation in degrees.
origin
An AnnPoint structure that represents the center of the rotation.
If the object implements auto transformation (TransformObjectMode returns .Auto), the logical coordinates of the object do not change when this method is called. Instead, the Transform matrix is updated and the effect is only applied when transforming the object to physical space (e.g. when drawing or hit-testing the object).
If the object implements point transformation (TransformObjectMode returns .Points), the logical coordinates of the object might change when this method is called. The exact behavior depends upon the object's implementation of the GetTransformPoints and the SetTransformPoints methods.
For an example, refer to Transform.
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