For those who have never used matlab, ginput is a blocking call that
takes one optional argument n, waits for n click on the current figure,
and returns the coordinates of those n clicks. I have been trying to
write such a function in pylab and I can't find a solution.
Here is a first attempt:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
from pylab import *
from time import sleep
class gInput(object):
""" Class that create a callable object to retrieve mouse click in a
blocking way, à la MatLab.
"""
def on_click(self, event):
""" Event handler that will be passed to the current figure to
retrive clicks.
"""
print "called"
if event.inaxes:
self.clicks.append((event.x, event.y))
print self.clicks
def __call__(self, n):
""" Blocking call to retrieve n coordinate pairs through mouse
clicks.
"""
assert isinstance(n, int), "Requires an integer argument"
connect('button_press_event', self.on_click)
self.clicks = []
tmp = 0
while len(self.clicks)<n :
sleep(0.1)
tmp += 1
if tmp == 100:
break
return self.clicks
ginput = gInput()
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I run this in ipython -pylab.
This fails. I am not to sure why. It seems the "connect" does not happen
until the __call__ function returns. This is probably due to
eventloop/thread problems that I don't master terribly well. Is there a
solution for this problem (ie a blocking call to retrieve coordinates).
If so it would be great to have such a function in pylab.
Cheers,
Gaël
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