On Dec 26, 10:01 pm, Ian Kelly <ian.g.ke...@gmail.com> wrote:
> On Mon, Dec 26, 2011 at 11:31 AM, Yigit Turgut <y.tur...@gmail.com> wrote:
> > I have a loop as following ;
>
> > start = time.time()
> > end = time.time() - start
> > while(end<N):
> > data1 = self.chan1.getWaveform()
> > end = time.time() - start
> > timer.tick(10) #FPS
> > screen.fill((255,255,255) if white else(0,0,0))
> > white = not white
> > pygame.display.update()
> > for i in range(self.size):
> > end = time.time() - start
> > f.write("%3.8f\t%f\n"%(end,data1[i]))
>
> > Roughly speaking, this loop displays something at 10 frames per second
> > and writes data1 to a file with timestamps.
>
> > At first loop data1 is grabbed but to grab the second value (second
> > loop) it needs to wait for timer.tick to complete. When I change FPS
> > value [timer.tick()], capturing period (time interval between loops)
> > of data1 also changes. What I need is to run ;
>
> > timer.tick(10) #FPS
> > screen.fill((255,255,255) if white else(0,0,0))
> > white = not white
> > pygame.display.update()
>
> > for N seconds but this shouldn't effect the interval between loops
> > thus I will be able to continuously grab data while displaying
> > something at X fps.
>
> > What would be an effective workaround for this situation ?
>
> You essentially have two completely independent loops that need to run
> simultaneously with different timings. Sounds like a good case for
> multiple threads (or processes if you prefer, but these aren:
>
> def write_data(self, f, N):
> start = time.time()
> while self.has_more_data():
> data1 = self.chan1.getWaveform()
> time.sleep(N)
> for i in range(self.size):
> end = time.time() - start
> f.write("%3.8f\t%f\n" % (end, data[i]))
Why is there N variable in write_data function ? N is related to
timer.tick(N) which is related to display function ? time.sleep(N)
will pause writing to file for specified amount of time which is
exactly what I am trying to avoid.
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