Re: [Matplotlib-users] Picking on a scatter plot. Copy of positions needed?

[Benjamin R. <ben...@ou...>]

It is possible. Those examples were merely showing different ways to do
similar things (and there are more ways to do it, btw). The techniques can
be used for different artist types. I guess the important question is, do
you need the *exact* coordinates of the artist, or just the coordinates
where the mouse clicked? If it is just the location of the mouse click,
then the "xdata" and "ydata" attributes should be all you need.

For picking events, the event object will have an "artist" attribute that
will point to the artist that was "picked". For collection type artists,
there should be an "ind" attribute to the event object that provides the
index into the array held by the collection artist. You can then index the
data contained by the collection object already. Different collection
objects, unfortunately, have slightly different getters. So, while some
might have get_xdata() and get_ydata(), others might have get_points() or
something like that. I never get them straight in my head.

Cheers!
Ben Root

<shameless_plug>There will be some useful examples of this and a deeper
explanation in my upcoming book on interactive matplotlib. Stay tuned to
this mailing list for announcements</shameless_plug>


On Fri, Nov 14, 2014 at 9:03 AM, V. Armando Sole <so...@es...> wrote:

> Hello,
>
> Looking at the picking demo:
>
> http://matplotlib.org/examples/event_handling/pick_event_demo.html
>
> I see that one can recover the coordinates from the picked artist in the
> case of images, and lines. However, in case 3 of the example (scatter
> plot) the x and y data have to be supplied in order to retrieve the
> coordinates. Is there a way to recover them from the artist? I got the
> (wrong?) feeling that the data must be hidden somewhere ... If that is
> not possible I'll have to keep a copy of the data used to generate the
> artist, but I would not like to do so.
>
> Any hint?
>
> Thanks,
>
> Armando
>
>
> ------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=154624111&iu=/4140/ostg.clktrk
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>