Does RenderTransformOrigin influence scale transforms?

I am trying to do scale transforms on an InkCanvas and some unseen force seems to be influencing how the scale works. When I try to set CenterX and CenterY they appear to be being ignored.

Update: I should note that the ink canvas is wrapped with a viewbox, I suppose that 开发者_如何学Gocould be influencing it too...

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I tried it out and it does. E.g. in order to make a control sweep from right to left I moved the RenderTransformOrigin to "1, 0" .

I am not certain about the documentation but it could be that CenterX/Y relate not to normalized proportions but to the actual size of the UIElement. If that's the case it is sort of useless.