[visionegg] Re: using pygame.time.delay

Darren -
Another way to do this is to set up a controller, using the presentation structure.

for example if you have:
trial_start_time = 0.
def my_controller(t):
if t-trial_start_time <= my_stimulus time:
stimulus.parameters.on = True #We turned this off during intertrial time
#do something to put stimulus on screen here
elif t-trial_start_time <= my_stimulus_time + my_intertrial_time :
#set stimulus to something blank
stimulus.parameters.on = False #For example
elif t-trial_start_time > my_stimulus_time + my_intertrial_time:
trial_start_time = t

p.add_controller(None,None,FunctionController(during_go_func=my_controll er))

This way you can add a controller to handle keypresses, without writing your own control loop.

Mark

On Mar 22, 2005, at 2:05 PM, Darren Weber wrote:

Hi,

I've got a series of visual images to present, each has a defined
duration.  If each stimulus is presented in a for loop, I've found
that the duration of the stimulus can be handled by pygame.time.delay.
 However, I wonder if this has any implications for event handling?
Does anyone using the visionegg know if this would be a problem?  That
is, can pygame event handling work during pygame.time.delay?

If pygame.time.delay is problematic, how would you control the
stimulus duration?  Do you need to setup a while loop that continues
to display a stimulus, checking for events and finally exits after a
certain time from onset?  What is the best way to implement the
timing?  Would you use pygame modules or something in the visionegg
itself?

Best, Darren
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