[visionegg] Re: Terminating a While Loop
- From: Mark Halko <mhalko@xxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Tue, 17 Jul 2007 14:48:53 -0400
Without seeing your code, it's difficult to say.
Your error comes from p not being defined.
if p=Presentation(...) is not defined before the loop it won't work.
Or it could be out of the namespace somehow (if you put it in another
function, for example).
I would suggest using the callback functions for the presentation
classes, rather than the keydown checks after your presentation like
I showed.
import sys
p=Presentation(foo...)
quit_now=False
pause = False
def keydown(event) :
global quit_now, pause
if event.key == pygame.locals.K_ESCAPE :
quit_now = True
if event.key == pygame.locals.K_SPACE :
pause = not pause
p.parameters.handle_event_callbacks = [(pygame.locals.QUIT, sys.exit),
(pygame.locals.KEYDOWN,keydown)]
while not quit_now :
p.go()
# you may need to add callback checks outside of go loop, I don't know
for ev in pygame.event.get() :
if ev == pygame.locals.KEYDOWN : keydown(ev)
if ev == pygame.locals.QUIT: sys.exit()
If you're trying to give an unspecified number of trials, you may
find it easier to code up a single presentation as the "go loop", and
incorporate the trial structure with a controller.
for example:
p=Presentation(go_duration=('forever',), viewports=myviewports)
nTrials=0
max_trials=5
trialStartTime=0.
trialLen =2.0
def my_trial_handler(t) :
global nTrials, trialStartTime
if t > trialStartTime + trialLen:
nTrials +=1
if nTrials > max_trials: sys.exit()
else : trialStartTime=t
#do some trial specific stuff
p.add_controller(None,None, FunctionController
(during_go_func=my_trial_handler))
p.parameters.handle_event_callbacks = [(pygame.locals.QUIT, sys.exit),
(pygame.locals.KEYDOWN,keydown)]
Hope this helps,
Mark
On Jul 17, 2007, at 2:07 PM, Maher, Jeffrey wrote:
Mark,
Alright I tried this, and I seemed to get some slightly better
results, it didnt fail as quickly. But when I looked into my log of
errors, it now says that the p in the p.go is not defined. Heres
the exact error:
File "C:\Python22\VisionEgg\visionegg-0.9.9-demo\demo\project
\stim_project4c.py", line 614, in ?
p.go()
NameError: name 'p' is not defined
I havent had a problem with it before, when it was in the while
loop. Any suggestions as to why its becoming a problem now? Sorry
if this is a stupid mistake on my part, but any advice that you may
have would be much appreciated.
-Jeff
________________________________
From: visionegg-bounce@xxxxxxxxxxxxx on behalf of Mark Halko
Sent: Tue 7/17/2007 12:52 PM
To: visionegg@xxxxxxxxxxxxx
Subject: [visionegg] Re: Terminating a While Loop
How about something as simple as:
quit_now = False
pause = False
while not quit_now:
if not pause :
p.go()
for event in pygame.event.get():
if event.type == pygame.locals.KEYDOWN :
if event.key == pygame.locals.K_ESCAPE :
quit_now = True
if event.key == pygame.locals.K_SPACE :
pause = not pause
You could also set quit_now to True to quit if you reach some
criterion level from your experiment.
Mark
On Jul 17, 2007, at 1:14 PM, Maher, Jeffrey wrote:
Hello,
Im currently working on the following code trying to determine a
way to exit a while loop before the criteria is satisfied.
i=0
while i<eval(self.number.get()):
p.go
i=i+1
My goal is to set it to a certain key that will either pause the
program, and then resume it once pressed again, or have it exit the
program all-together, either/or would be acceptable.
I had tried setting it to the "esc" key by doing the following code
that I found while searching for an answer:
if msvcrt.kbhit() and msvcrt.getch() == chr(27):
break
But that just causes the program to fail to start up.
I have also tried:
for event in pygame.event.get():
if event.type == pygame.locals.KEYDOWN:
if event.key == pygame.locals.K_ESCAPE:
sys.exit()
But this again just causes the program to fail to start up.
Any suggestions would be greatly appreciated.
-Jeff
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