On Mon, Sep 20, 2010 at 8:14 PM, Brian Blais <bbl...@bryant.edu> wrote:
> sure, but that take more effort, and I don't really care about a slow down,
> because most of my time is spent in the busy loop. I do
> care about it displaying *at all*, which is the problem. I am familiar with
> the efficient way of animating, but for most things I want to
> focus on the computation and then display here and there, so I want the
> shortest, clearest plotting code without any optimizations. if I
> call plot commands, and then a draw, I expect it to actually pause right
> there until it is done drawing, and then continue...it's not doing
> that.
It might be more effort, but what you're doing now plays havoc with
GUI event loops. Now, granted, until EPD upgrades to Matplotlib 1.0.0
this won't work for you (unless you're willing to install your own),
but this is how IMHO is best to approach this problem:
import matplotlib.pyplot as plt
import numpy as np
import sys
def dot():
sys.stdout.write('.')
sys.stdout.flush()
def busy_loop():
for i in range(1000):
r = np.random.rand(100,100)
return r
def update_plot():
update_plot.count += 1
r = busy_loop()
plt.clf()
plt.imshow(r, interpolation='nearest', cmap=plt.get_cmap('gray'))
plt.draw()
dot()
# Automatically stops after 10
return update_plot.count < 10
update_plot.count = 0
fig = plt.figure()
# Creates a new timer that fires every 250 ms
timer = fig.canvas.new_timer(interval=250)
timer.add_callback(update_plot)
timer.start()
plt.show()
This, to me, isn't any more complex than your original (the most
complex part comes from getting it to stop after a fixed number of
iterations). The benefit is that the timed updates integrate into the
GUI event loop and don't fight it. The other benefit is that this
works with any of the interactive backends and you don't end up
debugging weird draw problems. Even when I've gotten your style of
animation to work in the past, I've still had problems where resizing
the figure, etc. don't work.
Hope this helps (at least in the future),
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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