On Tue, Nov 16, 2010 at 12:01 PM, Nicolas Bigaouette
<nbigaoue...@gmail.com>wrote:
> Hi all,
>
> I have defined some shortcuts I often use using pylab.ginput(). I normally
> do:
>
>> fig = pylab.figure()
>
> fig.canvas.mpl_connect('key_press_event', on_key)
>
> with my "on_key" function being (simplified):
>
>> def on_key(event):
>
> if (event.key == 'q'):
>
> sys.exit(0)
>
> elif (event.key == 'w'):
>
> pylab.close(pylab.gcf())
>
> elif (event.key == 'd'):
>
> print "Please click two points to get the distance and slope."
>
> points = pylab.ginput(n=2, show_clicks=True)
>
> [...]
>
> pylab.plot([points[0][0], points[1][0]], [points[0][1],
>> points[1][1]], '+r', lw=1.0)
>
> pylab.plot([points[0][0], points[1][0]], [points[0][1],
>> points[1][1]], '--r', lw=1.0)
>
> pylab.draw()
>
>
> I'm plotting two markers where the user clicked and a line between them.
>
> This works fine, except when there is multiple subplots. I can correctly
> select points and get their position, but the plot commands will put the
> markers+line in the last subplot. I tried using "pylab.gca().plot()" but
> gca() always returns the last axes.
>
> My question is, how can I plot on the axes the user clicked on?
>
> Thank you!
>
>
While this isn't in the same approach you were going, you could continue to
use mpl_connect instead of ginput. If you create connections (and properly
disconnect as well) 'button_press_event' and 'button_release_event', you can
then utilize the event.inaxes property of the event object. This has an
added advantage of making sure that the mouse click events are inside the
axes.
Another approach might be to find out the bbox's of all the subplot axes and
see if a coordinate falls inside any of those.
Ben Root
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