Thread: [Matplotlib-users] How to get the coordinates (picker)

Hi,

I'm trying to write a pyqt4 application including pylab plotting
capabilities.
Up to now, it looks like this (see in attachment).

The picker works fine (I get the msg) *but* I also would like to get the
(x,y) coordinates and the the corresponding value A[x,y].
Could someone tell me what I should do in on_pick with this "event"  to
get these data??

Xavier

Hi Xavier,

XG> I'm trying to write a pyqt4 application including pylab plotting
XG> capabilities.
XG> Up to now, it looks like this (see in attachment).
XG>
XG> The picker works fine (I get the msg) *but* I also would like to get
XG> the (x,y) coordinates and the the corresponding value A[x,y].
XG> Could someone tell me what I should do in on_pick with this "event"
XG> to get these data??
XG>
XG> Xavier

This works for me:

     def on_pick(self, event):
         tt = event.artist.get_axes()
         mouseevent = event.mouseevent
         msg = "X is: " + str(mouseevent.xdata) + "\nY is: " + 
str(mouseevent.ydata)
         QMessageBox.information(self, "Click!", msg)

I got some good tips on how to do this from 
examples/event_handling/pick_event_demo.py

-- 
Christopher Brown, Ph.D.
Department of Speech and Hearing Science
Arizona State University

Christopher Brown wrote:
> Hi Xavier,
>
> XG> I'm trying to write a pyqt4 application including pylab plotting
> XG> capabilities.
> XG> Up to now, it looks like this (see in attachment).
> XG>
> XG> The picker works fine (I get the msg) *but* I also would like to get
> XG> the (x,y) coordinates and the the corresponding value A[x,y].
> XG> Could someone tell me what I should do in on_pick with this "event"
> XG> to get these data??
> XG>
> XG> Xavier
>
> This works for me:
>
>     def on_pick(self, event):
>         tt = event.artist.get_axes()
>         mouseevent = event.mouseevent
>         msg = "X is: " + str(mouseevent.xdata) + "\nY is: " +
> str(mouseevent.ydata)
>         QMessageBox.information(self, "Click!", msg)
>
> I got some good tips on how to do this from
> examples/event_handling/pick_event_demo.py
>
Thanks!! It works just fine :). IDL is dead. Qt4 python and
numpy/scipy/numpy are great tools.

Xavier

On Tue, Mar 24, 2009 at 3:01 PM, Xavier Gnata <xav...@gm...>wrote:

>
> > I got some good tips on how to do this from
> > examples/event_handling/pick_event_demo.py
> >
> Thanks!! It works just fine :). IDL is dead. Qt4 python and
> numpy/scipy/numpy are great tools.



Thanks!  You may also want to check out the event handling and picking
tutorial at

http://matplotlib.sourceforge.net/users/event_handling.html

JDH