The PsychoPy Wiki - PlaidDemo

Drifting plaid demo

The following code also checks for a keypress. The timing method simply uses a Clock object with the .getTime() call. This is very easy to code, but not quite as accurate as using the frame tick.

from psychopy import visual, core, event

#create a window to draw in

myWin = visual.Window((600,600),allowGUI=False)

#INITIALISE SOME STIMULI

grating1 = visual.PatchStim(myWin,mask="gauss",

                        opacity=1.0, sf=(4,0), ori = 45)

grating2 = visual.PatchStim(myWin,mask="gauss",

                        opacity=0.5, sf=(4,0), ori= 135)

message = visual.TextStim(myWin,rgb=1.0, pos=(-0.95, -0.90),alignHoriz='left',

            text='q to quit...')

t = 0

frameDuration=1.0/60

while t<20:#quits after 20 secs 

        t=t+frameDuration

        grating1.setPhase(2*t)  #drift at 2Hz

        grating1.draw()  #redraw it

        grating2.setPhase(t)    #drift at 1Hz

        grating2.draw()  #redraw it

        message.draw()

        myWin.flip()          #update the screen

        #handle key presses each frame

        for keys in event.getKeys():

                if keys in ['escape','q']:

                        core.quit()

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