[vtkusers] Centering an image in the window

[Jahn Otto Næsgaard Andersen]

I'm using vtkTexturedActor2D and vtkImageMapper to display a 2D image. I
can use

actor.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
actor.this.Actor.SetPosition(0.5, 0.9);

to place the image in the center of the window, but it's not
center-aligned. The corner of the image is placed in the center. How can I
center-align the image so that the center of the image is at the center of
the window?
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