[visionegg] Re: using pygame.time.delay

Thanks guys, that makes sense; pygame.time.delay() does get in the way
of event handling.  I found that pygame.time.get_ticks() will keep
track of time (so long as pygame.init() precedes the call).


On Tue, 22 Mar 2005 15:24:12 -0500, Mark Halko <mhalko@xxxxxx> wrote:
> 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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> >
> 
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