Re: [Matplotlib-users] Pan/Zoom can't work with blitting

[Clare S. <cla...@gm...>]

Hi Michiel,

I'm using GtkAgg. Please correct me if I'm wrong, but issue 531's problem
is with blitting, for me blitting works, I'm able to speed up plotting
using canvas.copy_from_bbox(), canvas.restore_region() & canvas.blit().
It's just that after plotting, if I try to pan or zoom using the pan/zoom
buttons on the navigation toolbar, whatever I've plotted disappears & the
whole thing becomes blank. I'm able to pan/zoom if I use canvas.draw() but
plotting is too slow because it redraws everything.

Regards,
Clare.

On Fri, Apr 12, 2013 at 8:22 AM, Michiel de Hoon <mjl...@ya...>wrote:

>   Hi Clare,
>
> Which backend are you using, and can you show an example script?
>
> The blitting functions are a bit unusual as they try to draw stuff to the
> figure outside of the event loop. This is e.g. causing problems with
> animations, which makes use of the blitting functions. We have been looking
> at that recently (see https://github.com/matplotlib/matplotlib/issues/531)
> but we haven't come up with a solution yet. Solving this issue may also fix
> your problem (which sounds like an event loop problem), so you may want to
> follow issue 531.
>
> Best,
> -Michiel.
>
> --- On *Thu, 4/11/13, Clare Soh <cla...@gm...>* wrote:
>
>
> From: Clare Soh <cla...@gm...>
> Subject: [Matplotlib-users] Pan/Zoom can't work with blitting
> To: "mat...@li..." <
> mat...@li...>
> Date: Thursday, April 11, 2013, 5:19 AM
>
>
>  Hi,
>
> To improve plotting speed, I decided
> to use blitting(canvas.copy_from_bbox(), canvas.restore_region() &
> canvas.blit()) instead of canvas.draw(), however panning & zooming stops
> working after this change. Now, when I click on the 'Pan/Zoom' button or
> the 'Zoom to rectangle' button on the Navigation Toolbar, my plot becomes
> empty. I don't know what's going wrong, can someone please point me in the
> right direction?
>
> Thank you,
> Clare.
>
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