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Changing colour and position of stimuli

I’m trying to change the colour of a stimuli (a moving rectangle - that changes position according to a disturbance). I’m unable to change the colour as I would if it wasn’t moving.

The code for the stimuli is:

refship = visual.Rect(win,
width=40, height=60, units=‘pix’

The code for the movement is:

#calculating disturbcance for reference ship
refship.pos = (dist * 2.0, 0)

When (and what) do I need to write to change the colour.

Apologies for the lack of correct nomenclature!

Rect is a special case of ShapeStim. See the API for that here: