How can I rotate a Container widget in 2D around a specified anchor point?

Question

I\'d like to perform a very simple 2D rotation of a Container widget (that contains a handful of other widgets.) This widget would be rotated around a single fixed point in the

Answer 1

Apply a translation (to and from the fulcrum) before and after the rotation.

You can create yourself a little widget that does this, and thus solve your other problem at the same time (hiding the Matrix4).