Hey guys,
I'm not 100% sure if anyone has solved this problem, but I couldn't
find it, so here it is. This is based on a thread by Gael Varoquaux
about a year ago. The key element that was missing was the wx.Yield()
command, which gives up control of the current thread so the rest of
the world can take a whack. I've been trying to figure this out for
years, so I'm pretty pumped. :) Thanks Gael!
This works for me in pyshell/pycrust using wxAgg.
Enjoy!
import wx as _wx
import pylab as _pylab
import time as _time
class GaelInput(object):
"""
Class that creates a callable object to retrieve mouse click in a
blocking way, a la MatLab. Based on Gael Varoquaux's almost-working
object. Thanks Gael! I've been trying to get this working for years!
-Jack
"""
debug = False
cid = None # event connection
def on_click(self, event):
"""
Event handler that will be passed to the current figure to
retrive clicks.
"""
# if it's a valid click, append the coordinates to the list
if event.inaxes:
self.clicks.append((event.xdata, event.ydata))
if self.debug: print "boom: "+str(event.xdata)+",
"+str(event.ydata)
def __call__(self, n=1, timeout=30, debug=False):
"""
Blocking call to retrieve n coordinate pairs through mouse clicks.
"""
# just for printing the coordinates
self.debug = debug
# make sure the user isn't messing with us
assert isinstance(n, int), "Requires an integer argument"
# connect the click events to the on_click function call
self.cid = _pylab.connect('button_press_event', self.on_click)
# initialize the list of click coordinates
self.clicks = []
# wait for n clicks
counter = 0
while len(self.clicks) < n:
# key step: yield the processor to other threads
_wx.Yield();
# rest for a moment
_time.sleep(0.1)
# check for a timeout
counter += 1
if counter > timeout/0.1: print "ginput timeout"; break;
# All done! Disconnect the event and return what we have
_pylab.disconnect(self.cid)
self.cid = None
return self.clicks
def ginput(n=1, timeout=30, debug=False):
"""
Simple functional call for physicists. This will wait for n clicks
from the user and
return a list of the coordinates of each click.
"""
x = GaelInput()
return x(n, timeout, debug)
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