Re: FigureCanvasWxAgg not redrawn with wxpython 4.0.1 on Ubuntu 17.10

On Wednesday, September 5, 2018 at 1:25:48 PM UTC-5, Dietmar Schwertberger 
wrote:
>
> On 9/5/2018 3:34 AM, Matthew Newville wrote:
>
> Is there a problem I am not seeing that others are seeing? 
>
> Is there a better way to draw a rubber-band box on top of a 
> matplotlib canvas?
>
> These platforms made problems, IIRC:
>
> Wayland with wxPython 4 (it was working with Classic where wx was using X 
> compatibility mode):
> Overlays did not work.
> For a screen update, a Refresh was needed as the direct drawing using 
> ClientDC did not update the screen.
>

Hm, I don't see those problems.  Well, maybe I am not understanding what 
the problem is.
 

> Mac OS with wxPython 4 (not sure about Classic):
> SetLogicalFunction did not work.
>

I don't see that.
 

> Overlays have a scaling problem when using Hi DPI displays. The Overlay 
> issue is only seen when drawing semi-transparent on the Overlay.
>

Hm, well maybe I'm not using Retina displays enough.
 

>
> Well, maybe there would have been a way to make ClientDC work, but it 
> makes sense to use BufferedPaintDC anyway.
>


I don't have any preference for how such overlays (like rubber band boxes 
or persistent graphics on a live image) are done, but I would prefer to 
have a stable way of doing these things and would like to know if there are 
potential problems even if I am not currently seeing them. 

Can you (or someone) post example code that demonstrates these problems?  

--Matt

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