[visionegg] Re: Constraining SinGrating2D phase with t0_time_sec_absolute = None
- From: "Lyle J. Graham" <lyle@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <visionegg@xxxxxxxxxxxxx>
- Date: Tue, 8 Nov 2005 21:48:04 +0100
Dear all,
Just a follow-up: I have solved the immediate issue by modifying the
SinGrating2D class to include a boolean parameter, which allows the necessary
resetting of the phase reference time when set (for example by a controller):
class SinGrating2D(LuminanceGratingCommon):
...
parameters_and_defaults = VisionEgg.ParameterDefinition({
'reset_t0_time':(True,
ve_types.Boolean,
"for controlling initial phase"),
...
})
...
def draw(self):
...
if p.t0_time_sec_absolute is None and not p.ignore_time:
p.t0_time_sec_absolute = VisionEgg.time_func()
if p.reset_t0_time:
p.reset_t0_time = False
p.t0_time_sec_absolute = VisionEgg.time_func()
...
But, I would still be interested in knowing why the solution originally
suggested using the t0_time_sec_absolute parameter does not work.
Thanks,
Lyle
----- Original Message -----
From: Lyle Graham
To: visionegg@xxxxxxxxxxxxx
Sent: Tuesday, November 08, 2005 2:21 PM
Subject: [visionegg] Constraining SinGrating2D phase with
t0_time_sec_absolute = None
Dear all,
I am trying to constrain the starting phase of a grating. According to an
earlier suggestion from Andrew, and following the source code for Gratings.py,
I tried adding a controller for the t0_time_sec_absolute parameter:
grating_stimulus = SinGrating2D()
grating_t0_time_sec_absolute_controller =
EvalStringController(during_go_eval_string='None',
between_go_eval_string='None',
eval_frequency=VisionEgg.FlowControl.Controller.TRANSITIONS)
viewport = Viewport( screen=screen, stimuli=[grating_stimulus] )
p = Presentation(viewports=[viewport],check_events=1)
p.add_controller(grating_stimulus,'t0_time_sec_absolute',
grating_t0_time_sec_absolute_controller)
p.run_forever()
Note that when I used the ConstantController instead of the
EvalStringController, that is:
initial_controller=ConstantController(during_go_value=None,...)
I got the following error:
File "C:\Program
Files\SurfVision\SurfVisionStimulusSuiteTCP\SurfVisionVisualStimuliSuiteTCP.py",
line 103, in ?
eval_frequency=VisionEgg.FlowControl.Controller.TRANSITIONS))
File "C:\PROGRA~1\Python\lib\site-packages\VisionEgg\FlowControl.py",
line 874, in __init__
raise ValueError("Must specify during_go_value")
ValueError: Must specify during_go_value
In any event, with the EvalStringController I get the following error:
File "C:\Program
Files\SurfVision\SurfVisionStimulusSuiteTCP\SurfVisionVisualStimuliSuiteTCP.py",
line 194, in ?
p.add_controller(grating_stimulus,'t0_time_sec_absolute',
grating_t0_time_sec_absolute_controller)
File "C:\PROGRA~1\Python\lib\site-packages\VisionEgg\FlowControl.py",
line 177, in add_controller
raise TypeError("Attempting to control parameter '%s' of type %s with
controller that returns type %s"%(
TypeError: Attempting to control parameter 't0_time_sec_absolute' of type
Real with controller that returns type None
Thanks very much for any suggestions.
Lyle
Lyle J. Graham
Laboratory of Neurophysics and Physiology, CNRS UMR 8119
www.neurophys.biomedicale.univ-paris5.fr/~graham
UFR Biomédicale de l'Université René Descartes
45 rue des Saint-Pères, 75006 Paris
Tel: 33 1 42 86 20 92 (Secrétariat: 33 1 42 86 21 38) Fax: 33 1 49 27 90 62
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