Thread: [matplotlib-devel] example: wx.ToolTip for MPL axes

Not sure if this already exists, but here's an example file of how to 
get a wx.ToolTip to pop up and report the current mouse position in data 
coordinates over a MPL axes. Not sure if it's the best way of doing 
this, but it seems to work really well for me. Perhaps it would be 
useful to add this to the MPL examples?

Cheers,

Martin

Here's an updated version. mpl.use('WXAgg') should come before importing 
pylab.

Martin

Martin Spacek wrote:
> Not sure if this already exists, but here's an example file of how to 
> get a wx.ToolTip to pop up and report the current mouse position in data 
> coordinates over a MPL axes. Not sure if it's the best way of doing 
> this, but it seems to work really well for me. Perhaps it would be 
> useful to add this to the MPL examples?
> 
> Cheers,
> 
> Martin

And here's yet another refinement. Works around a wx bug (see 
http://article.gmane.org/gmane.comp.python.wxpython/37937/match=tooltip) 
that prevents newlines from being recognized in the tooltip string. 
Also, disables the tooltip when the mouse moves off of the axes, which 
prevents stray tooltips from hanging around.

Martin

Martin Spacek wrote:
> Here's an updated version. mpl.use('WXAgg') should come before importing 
> pylab.
> 
> Martin
> 

> What is this supposed to give you. I get a Very long tooltip box with:
> 
> tip with a
> long
> line and a newline
> 
> 
> In it.
> 
> then, when the mouse starts moving, I get a tip that is just the right 
> size to hold the two coords, each on their own line.

That initial tooltip never shows up for me, which I think is the correct 
behaviour, so I just put whatever in there to make it a really long line 
to get around the wx bug.

> wxGTK2
> 
>> Also, disables the tooltip when the mouse moves off of the axes, which 
>> prevents stray tooltips from hanging around.
> 
> this doesn't work for me either. If that code in enables, the tip goes 
> away and does not come back at all.
> 
> I guess I'll make a non-MPL version, and send a note to the wxPython list.
> 
> -Chris
> 

Cool. Yeah, I don't think wx gets as much testing on GTK as it does on 
Windows.

Martin

Martin Spacek wrote:
> That initial tooltip never shows up for me, which I think is the correct 
> behaviour,

Probably. You have that Enable(False) call in there. However, I notice 
from the docs that wx.ToolTip.Enable() is a "global" call -- it doesn't 
just enable or disable that particular tooltip. I can't say I really 
understand what that means, though.

> so I just put whatever in there to make it a really long line 
> to get around the wx bug.

Well, it seems to work OK for all the next tips.

> Cool. Yeah, I don't think wx gets as much testing on GTK as it does on 
> Windows.

I think it does. I think GTK and MSW get about equal usage, with wxMac a 
very distant third.

(and this is working very poorly on Mac)

Some things work better on Windows, some on GTK. In this case, I thihk 
we're bumping into cross-platfrom issues. wx tries to use native 
functionality where it can and that does make for differences.

I'm going to take this discussion over to wxpython-users -- are you on 
that list too?

-Chris



-- 
Christopher Barker, Ph.D.
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Chr...@no...

I've updated the docstring with a comment about display issues in wxGTK.

Martin

Martin Spacek wrote:
> Not sure if this already exists, but here's an example file of how to 
> get a wx.ToolTip to pop up and report the current mouse position in data 
> coordinates over a MPL axes. Not sure if it's the best way of doing 
> this, but it seems to work really well for me. Perhaps it would be 
> useful to add this to the MPL examples?
> 
> Cheers,
> 
> Martin
> 
>