Accurate timer using python time [on the microseconds level]

Question

I want to create trigger that runs something every 500 ms, and it should be without drifting over time. I have this code running to show something in pyopengl

def __init__(self):
    ...
    self.t_on = time.clock()
    ...
def display_gl(self):
    ...
    if (time.clock() - self.t_on) >= 0.500:
        self.t_on = time.clock()
        #do things
    ...

the clock is drifting over time, I think that's because the if condition is catching the 500 ms moment after a little time.

Is there any way to avoid this drifting issue?

Solved:
changed:

if (time.clock() - self.t_on) >= 0.500:
    self.t_on = time.clock()

to:

if (time.clock() - self.t_on) >= 0.500:
    self.t_on =time.clock() - ((time.clock() - self.t_on) - 0.500)

check the time of your if statement then deduce if from 500ms, so the new time+ process time is exactly 500ms. — Mayeul sgc, Mar 20 '17 at 11:20

score 0 · Answer 1 · edited May 23 '17 at 11:46

0

Solved:
thanks to Mayeul sgc
changed:

if (time.clock() - self.t_on) >= 0.500:
    self.t_on = time.clock()

to:

if (time.clock() - self.t_on) >= 0.500:
    self.t_on =time.clock() - ((time.clock() - self.t_on) - 0.500)

edited May 23 '17 at 11:46

Community

1
1

answered Mar 20 '17 at 11:36

zixmarkiz

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Accurate timer using python time [on the microseconds level]

1 Answers1