How to use zrotation for an SKShapeNode

Please could a kind expert tell me if it is possible to change the coordinate system for an SKShapeNode? I am trying to rotate one about its center using zrotation, but the axis seems to be the origin of the parent. SKShapeNodes dont have an anchorPoint, so I cant see how to proceed.
Very grateful for any help.

Replies

Doh! I should have read the documentation! Creating the skshapenode with the path being centered does the trick!