Howdy,
I spent a while chasing my tail today with some event handling code
until I tried backtracking from SVN matplotlib back to 0.99.1 (the one
in ubuntu 10.04) and the problem went away.
I'm attaching a script that reproduces the problem with a full
description in the docstring, reproduced here for completeness:
This example wires two event handlers that both respond to clicks by printing
event info identically. One is written as a standalone function, the other as
a method of an object.
- when run with MPL 0.99.1.1 (stock in ubuntu 10.04), both fire fine:
amirbar[mplbrush]> python mpleventbug.py
MPL version: 0.99.1.1
MPL: /usr/lib/pymodules/python2.6/matplotlib/__init__.py
/usr/lib/pymodules/python2.6/matplotlib/backends/backend_gtk.py:621:
DeprecationWarning: Use the new widget gtk.Tooltip
self.tooltips = gtk.Tooltips()
C1 - button=1, x=146, y=229, xdata=23.783488, ydata=0.846491
C2 - button=1, x=146, y=229, xdata=23.783488, ydata=0.846491
C1 - button=1, x=216, y=189, xdata=42.919628, ydata=0.671053
C2 - button=1, x=216, y=189, xdata=42.919628, ydata=0.671053
C1 - button=1, x=288, y=117, xdata=62.602515, ydata=0.355263
C2 - button=1, x=288, y=117, xdata=62.602515, ydata=0.355263
etc...
- when run with matplotlib r8721, the one that is a method does not fire:
amirbar[mplbrush]> python mpleventbug.py
MPL version: 1.0.0
MPL: /home/fperez/usr/opt/lib/python2.6/site-packages/matplotlib/__init__.pyc
C1 - button=1, x=150, y=170, xdata=24.876982, ydata=0.587719
C1 - button=1, x=169, y=160, xdata=30.071077, ydata=0.543860
C1 - button=1, x=187, y=135, xdata=34.991799, ydata=0.434211
C1 - button=1, x=210, y=120, xdata=41.279388, ydata=0.368421
###
This manifested itself in some more complex MPL code that had multiple
events not working when run inside ipython, but working OK outside of
ipython. Fortunately, the small self-contained example demonstrates
the problem even with ipython not being in the picture at all (the
runs above were from the command line), so I think there is an issue
in MPL proper.
Sorry that I can't dig deeper into the code right now to look for a fix...
Timing note: EPD is planning a release in a few weeks, I don't know
how close MPL is to a bugfix release in the 1.0.x series. I don't
know what version of mpl EPD plans to use, but if event handling is
really broken and a fix is feasible in the time available, it might be
worth pushing it through.
Cheers,
f
"""Event handling bug in matplotlib 1.0.x from svn.
This example wires two event handlers that both respond to clicks by printing
event info identically. One is written as a standalone function, the other as
a method of an object.
- when run with MPL 0.99.1.1 (stock in ubuntu 10.04), both fire fine:
amirbar[mplbrush]> python mpleventbug.py
MPL version: 0.99.1.1
MPL: /usr/lib/pymodules/python2.6/matplotlib/__init__.py
/usr/lib/pymodules/python2.6/matplotlib/backends/backend_gtk.py:621: DeprecationWarning: Use the new widget gtk.Tooltip
self.tooltips = gtk.Tooltips()
C1 - button=1, x=146, y=229, xdata=23.783488, ydata=0.846491
C2 - button=1, x=146, y=229, xdata=23.783488, ydata=0.846491
C1 - button=1, x=216, y=189, xdata=42.919628, ydata=0.671053
C2 - button=1, x=216, y=189, xdata=42.919628, ydata=0.671053
C1 - button=1, x=288, y=117, xdata=62.602515, ydata=0.355263
C2 - button=1, x=288, y=117, xdata=62.602515, ydata=0.355263
etc...
- when run with matplotlib r8721, the one that is a method does not fire:
amirbar[mplbrush]> python mpleventbug.py
MPL version: 1.0.0
MPL: /home/fperez/usr/opt/lib/python2.6/site-packages/matplotlib/__init__.pyc
C1 - button=1, x=150, y=170, xdata=24.876982, ydata=0.587719
C1 - button=1, x=169, y=160, xdata=30.071077, ydata=0.543860
C1 - button=1, x=187, y=135, xdata=34.991799, ydata=0.434211
C1 - button=1, x=210, y=120, xdata=41.279388, ydata=0.368421
"""
import sys
import matplotlib
import matplotlib.pylab as plt
import numpy as np
def onclick1(event):
print 'C1 - button=%d, x=%d, y=%d, xdata=%f, ydata=%f'%(
event.button, event.x, event.y, event.xdata, event.ydata)
sys.stdout.flush()
class Handler:
def __init__(self, figure):
cid1 = figure.canvas.mpl_connect('button_press_event', onclick1)
cid2 = figure.canvas.mpl_connect('button_press_event', self.onclick2)
def onclick2(self, event):
print 'C2 - button=%d, x=%d, y=%d, xdata=%f, ydata=%f'%(
event.button, event.x, event.y, event.xdata, event.ydata)
sys.stdout.flush()
if __name__ == "__main__":
print "MPL version:", matplotlib.__version__
print "MPL:", matplotlib.__file__
f = plt.figure()
ax = f.add_subplot(111)
ax.plot(np.random.rand(100))
Handler(f)
plt.show()
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