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

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

My user-story is that I have say several axvlines very close together in 
bunches in the standard xlim(). Take for example spectral lines (or fits 
to spectral lines). I want to pick a line and have the program tell me 
the x-location of that line. Since they're close together I need to zoom 
in to discriminate them. I don't want to have to zoom in, then move the 
mouse to unselect the zoom tool before moving the mouse back to do the 
pick or multiple picks.

M

PS: In GTKAgg at least, the zoom tool has a cross-hair pointer which in 
my opinion is even better than the arrow.

On 8/21/14 2:41 PM, Benjamin Root wrote:
> Imagine someone creates some event that would modify an artist upon
> picking, or do some expensive calculation, or some other action. But, I
> seriously doubt anybody would want those actions to fire while using the
> zoom/pan tool. Especially since the mouse cursor looks totally
> different. I am curious why you would expect pick events to fire while
> using pan/zoom. What is the user-story that compels that expectation?
> Perhaps I could be convinced otherwise to offer some sort of toggle.
>
>
>
> On Thu, Aug 21, 2014 at 2:33 PM, Michael Kaufman <kau...@or...
> <mailto:kau...@or...>> wrote:
>
>     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...>
>         <mailto:tca...@gm... <mailto:tca...@gm...>>> wrote:
>
>              On Thu, Aug 21, 2014 at 9:44 AM, Michael Kaufman
>         <kau...@or... <mailto:kau...@or...>
>              <mailto: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...>
>         <mailto:tca...@gm... <mailto:tca...@gm...>>
>
>
>
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