PsychoPy texture demonstration

from psychopy.visual import GratingStim, TextStim
import numpy as np

size = 256
x = -size
y = size
for tex in ['sin', 'sqr', 'saw', 'tri']:
    myStim = GratingStim(win, tex=tex, sf=.01, mask=None, size=size/1.5, pos=(x+size/2,y-size/2))
    myStim.draw()
    myText = TextStim(win, tex, pos=(x+size/2,y-size/2), color='#729fcf')
    myText.draw()
    x += size
    if x >= size:
        x = -size
        y -= size
win.flip()