#! /usr/local/bin/python2.5
from psychopy import visual,core,event
import numpy
#create a window with bitsMode='fast' (why would you ever use 'slow'!?)
win = visual.Window([800,800], bitsMode='fast')
grating = visual.PatchStim(win,mask = 'gauss',sf=2)
#---using bits++ with one stimulus
globalClock = core.Clock()
while True:
#get new contrast
t=globalClock.getTime()
newContr = numpy.sin(t*numpy.pi*2)#sinusoidally modulate contrast
#set whole screen to this contrast
win.bits.setContrast(newContr)# see http://www.psychopy.org/reference/
#draw gratings and update screen
grating.draw()
win.flip()
#check for a keypress
if event.getKeys():
break
event.clearEvents()
#reset the bits++ (and update the window so that this is done properly)
win.bits.setContrast(1)
win.flip()
core.quit()
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