On Wed, Jun 27, 2007 at 09:16:09AM -0500, John Hunter wrote:
> On 6/26/07, Brian T.N. Gunney <[EMAIL PROTECTED]> wrote:
> >I have a matplotlib script that generates several figures.
> >When a figure receives an event, how do I know which figure
> >it did it? For example, the key event 'w' is meant to close
> >the figure, but so far, I have no way to control which figure
> >gets closed.
>
> All events are connected to figures by definition -- the figure is
> placed inside a GUI canvas and that is what manages the events. The
> pylab connect function is just a thing wrapper to the canvas
> mpl_connection function. pylab's connect just grabs the current
> figure with "gcf" and makes the call fig.canvas.mpl_connect
>
> So in matplotlib, events do not make since w/o reference to specific
> figures.
That makes sense. However, it's not clear to me which figure
is to be the "current" figure. It does not appear to be the
figure where the event occured.
>
>
> >In the pick_event_demo.py example, each figure is connected
> >to an event handler specific to it. I think this wouldn't
> >work in my case because I don't know how many figures I'd
> >have until I process some data.
>
> I don't see why this is a problem -- just set up the connections when
It's a problem because the number of figures is variable. I don't
know how many call-back functions to define when I write the script.
> you create the figure as you process the data. You'll probably need
> to post an example if you have further troubles, because it is hard to
> advise in the abstract.
Ok. Here is an example. Run this and type 'w' in window 0.
You should expect figure 0 to be closed, but instead, figure
2 is closed.
#!/usr/bin/env python
import sys
from pylab import *
# This is meant to illustrate that the number of figures is
# unknown until run time.
if len(sys.argv) > 1:
nfigs = int(sys.argv[1])
else:
nfigs = 3
# Process key presses.
def on_key(event):
if event.key=='w':
# Close current window.
# How do we control which window gets closed?
close()
elif event.key=='q':
# Exit.
sys.exit(0)
# Generate as many figures as specified on command line.
for i in range(nfigs):
figure(i)
title( str(i) )
plot(range(i+2))
connect('key_press_event', on_key)
show()
Thanks for helping.
Brian
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