[visionegg] Re: Stimuli updates not rendering

Hi Thorsten,
It's difficult to determine what's going on without a complete program. However, you can try setting the parameter using a function that does error checking -- set(). So, try "stimulus.set(on=True)". If this doesn't at least point you in the right direction, I'd be happy to look at a more complete code sample. 

-Andrew

Thorsten Pfister wrote:

Hi,
I am working on getting some visual stimuli flickering on screen. To achieve this I wrote a routine which, depending on certain circumstances, either sets each stimulis' 'on' parameter to 'True' or 'False'. This works insofar as the parameter is set (which I can confirm via __getattribute__), but unfortunately the output on the screen tells me otherwise.
To further test this I changed my code to always disable the 'on' parameter (i.e. 'False'), ''hoping'' to see a black screen afterwards - however the stimuli are still being drawn. Below you'll find the piece of code that handles these ideas (I stripped out stuff that is not relevant for the problem). I am quite new to VisionEgg, but after countless hours of crawling the archives and google I am 
also somewhat lost. =)

#-----------------------CODE---------------------------

def frequency_logic(self, t):
# here is some code that succesfully sets each stimulis' 'on' paramter to 'False' 
       return self.stimulis   # a list of stimulis

def exec_stimulator(self, ...):
       # some more code that is not related to the problem comes before
       self.viewport = Viewport(screen=self.screen,\
           stimuli=self.stimulis)
       frequency_controller = FunctionController(\
               during_go_func = self.frequency_logic,\
               eval_frequency = Controller.EVERY_FRAME,\
               temporal_variables = \
               Controller.TIME_SEC_SINCE_GO)
       presentation = Presentation( go_duration=(5.0,'seconds'),\
               viewports=[self.viewport])
       presentation.add_controller(self.viewport, 'stimuli',\
               frequency_controller)
       presentation.go()

#-----------------------CODE---------------------------
I'd really appreciate some tips or a pointer to the flaw in this logic. Thank you all in advance! 

Regards,
Thorsten Pfister
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