How to make a global form rotate?

Coding
1

Hello!

I am trying to create a squared pattern of evenly spaced crosses that rotates around fixation, similar to the one here.
I’ve managed to have a static pattern that looks somewhat the one I need with this:

grid = visual.ElementArrayStim(win,
    elementTex=None, elementMask='cross', nElements =100,
    fieldSize=(11, 11), sizes=(1.25, 1.25), 
    xys = np.mgrid[10:-10:10j, -10:10:10j].transpose(1,2,0).reshape(100,2), 
    colors=[-1.0000, -1.0000, -0.4510])

Now, I can make the single crosses rotate (by changing their orientation at each frame) but not the entire field (which is what I need, the single crosses need to remain aligned as they are).
Does anybody have any idea on how to implement this?

Thank you so much in advance!!!

2

I’ve not used the element array stim (mostly because I focus on solutions that work online) but I could certainly do this with an array of cross polygons using trig to calculate the positions of the crosses for a given orientation.