Is there any way to modify this transform to accept an optional parameter for a center point of rotation?  I have several differnt "layers" of data that I need to transform together.  All contain the same point around which I wish to rotate, but their exterior envelopes vary significantly.  I've found that I can union the layers and perform the affine transform on them as a whole and things stay in line, but I need to keep the layers separate and essentially call them form separate statements.   Any suggestions?

How can I rotate geometry on center point using AffineTransform function?

OK, I found AffineTransform::Rotate(angle) Optional parameter for a center point of rotation is good idea.