[Matplotlib-users] moving marker line under mouse

[Sven D. <du...@as...>]

Hi,




how could I realize a moving marker line under the mouse pointer?


I know about event handling
http://matplotlib.sourceforge.net/users/event_handling.html


and would use ‘ axes_enter_event’ to react on, then draw a line 
with


axvline(x=event.xdata, linewidth=1, color='r')


but how can I delete the line again without deleting my whole plot 
I have on that axes/subplot?


Also I didn't see any "mouse move" event that would recognize a 
change in cursor position? Or is that what is meant with 
'motion_notify_event'?


If that is so, it comes down to know how to delete a vertical line on 
a mouse_notify_event. Is there a way to get a (named) list of plots 
on a particular subplot? 


In a different context I tried to keep my on list  in a python 
self.axes list, but that was very tedious and I didn't finish 
it to work properly.




Cheers,




Sven