Re: [Matplotlib-users] pick_event after zooming/panning stops working.

[Michael K. <kau...@or...>]

What kind of bad stuff happens if we were to allow that?

M

On 8/21/14 2:29 PM, Benjamin Root wrote:
> Yes, those tools do "snarf" up pick events via the widgetlock mechanism,
> IIRC. This is entirely intentional, and I an not sure there is a bug
> here to fix.
>
>
> On Thu, Aug 21, 2014 at 12:01 PM, Thomas Caswell <tca...@gm...
> <mailto:tca...@gm...>> wrote:
>
>     On Thu, Aug 21, 2014 at 9:44 AM, Michael Kaufman <kau...@or...
>     <mailto:kau...@or...>> wrote:
>      >
>      >    # plot axvlines here... etc.
>      >
>      >    global cids
>      >
>      >    # remove any previous connections
>      >    for i in cids:
>      >       gcf().canvas.mpl_disconnect(i)
>      >    cids = []
>      >
>      >    cids.append(gcf().canvas.mpl_connect('pick_event',self.pick))
>      >
>     cids.append(gcf().canvas.mpl_connect('button_press_event',self.click))
>      >
>      >    draw()
>      >
>      > def pick(self, event):
>      >    thisline = event.artist
>      >    xdata, ydata = thisline.get_data()
>      >    print xdata[0]
>      >
>      > def click(self, event):
>      >    print "clicked"
>
>
>     See this minimal example
>
>     ```
>     import matplotlib.pyplot as plt
>     fig, ax = plt.subplots()
>
>     ax.axvline(.5, picker=6)
>     ax.plot(range(3))
>     cids = []
>
>     plt.draw()
>
>     def pick(event):
>         thisline = event.artist
>         xdata, ydata = thisline.get_data()
>         print xdata[0]
>
>     def click(event):
>         print "clicked"
>
>
>     cids.append(fig.canvas.mpl_connect('pick_event', pick))
>     cids.append(fig.canvas.mpl_connect('button_press_event', click))
>
>     ```
>
>     If you turn the zoom/pan tool off the picker works again.  I suspect
>     that there is some logic underneath those tools that are snarfing
>     events when the are turned on to avoid messy conflicts.  There is some
>     work going on (MEP22 iirc) to update the toolbar and make our tool
>     handling saner.
>
>     Tom
>     --
>     Thomas Caswell
>     tca...@gm... <mailto:tca...@gm...>
>
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