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Thomas00010111 wants to merge 9 commits into from
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Update multiprocess.py #6637

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41 changes: 19 additions & 22 deletions examples/misc/multiprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,8 @@
import numpy as np

import matplotlib
matplotlib.use('GtkAgg')
matplotlib.use('TkAgg')

@QuLogic QuLogic Jun 24, 2016

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Since you're using canvas API now, this might be portable enough to not require setting a specific backend at all.

import matplotlib.pyplot as plt
import gobject


class ProcessPlotter(object):
Expand All @@ -21,35 +20,33 @@ def __init__(self):
def terminate(self):
plt.close('all')

def poll_draw(self):
def call_back(self):
while 1:
if not self.pipe.poll():
break

def call_back():
while 1:
if not self.pipe.poll():
break
command = self.pipe.recv()

command = self.pipe.recv()
if command is None:
self.terminate()
return False

if command is None:
self.terminate()
return False
else:
self.x.append(command[0])
self.y.append(command[1])
self.ax.plot(self.x, self.y, 'ro')

else:
self.x.append(command[0])
self.y.append(command[1])
self.ax.plot(self.x, self.y, 'ro')

self.fig.canvas.draw()
return True

return call_back
self.fig.canvas.draw()

@tacaswell tacaswell Jun 29, 2016

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It is better to use draw_idle which defers the actually drawing until the GUI decides to really repaint the screen.

return True

def __call__(self, pipe):
print('starting plotter...')

self.pipe = pipe
self.fig, self.ax = plt.subplots()
self.gid = gobject.timeout_add(1000, self.poll_draw())
timer = self.fig.canvas.new_timer(interval=1000)
timer.add_callback(self.call_back)
timer.start()

print('...done')
plt.show()
Expand Down Expand Up @@ -78,7 +75,7 @@ def main():
for ii in range(10):
pl.plot()
time.sleep(0.5)
raw_input('press Enter...')

pl.plot(finished=True)

if __name__ == '__main__':
Expand Down