Circular rotating disc shape

Dear Psychtoolbox Experts,

I am trying to create circular disc/pizza like shape with one missing slice (powerpoint demo attached for kind consideration) in pstchtoolbox. I would like to overlay this disc shape on an image and the shape will rotate with fixed angles to create an circular moving window like effect. I am not sure how to create such shape in psychtoolbox and rotoate it. I would appreciate any suggestion/ comments/ help in programming this.


Best regards

The demo at the following link could be easily modified to achieve what you want.