Re: [matplotlib-devel] Kivy backend

[Cyrille R. <cyr...@gm...>]

I don't think it would work like the other backends. Last time I checked,
the MPL backend system would not let us achieve high performance. Currently
we use Jake Vanderplas' mplexporter system that was developed for mpld3.

Eventually, I guess we could expose the same interface as mpld3, i.e.
replace `plt.show()` by something like `vispy.show()`. This would display a
matplotlib figure with VisPy (which supports Qt, wx, and other GUI
toolkits) instead of one of matplotlib's backends. In the notebook,
something like `vispy.enable_notebook()` could replace matplotlib's inline
PNG by a dynamic WebGL canvas.

2015-03-13 17:33 GMT+01:00 Benjamin Root <ben...@ou...>:

> +1 on an OpenGL backend! Especially if I can off-load a lot of mplot3d
> stuff to it! Does vispy have any plans to eventually bring that into
> mainline matplotlib, or does it break too much with the standard set of
> backends to make sense in matplotlib (or maybe it is too much of a
> maintenance/packaging burden?)
>
> Ben Root
>
> On Fri, Mar 13, 2015 at 12:12 PM, Cyrille Rossant <
> cyr...@gm...> wrote:
>
>> Kivy is all built on OpenGL, so it would probably be pretty
>>> straightforward to generate teh image with AGG, then dump it to the screen
>>> as an OpenGL texture. But it would be a bit sad to not take advantage of
>>> OpenGL at all in that process. (and getting AGG to work with Kivy may be
>>> less than trivial...)
>>>
>>> Note that vector graphics in OpenGL is a serious pain, but maybe Kivy
>>> has some stuff to help?
>>>
>>> Also, the MPL back-end structure wasn't designed to push much of the
>>> transforming, etc to the back -end, which is too bad, as that's what OpenGL
>>> does well.
>>>
>>> But I'd still take a look at the work done to make a real OpenGL
>>> back-end -- not sure how far that got, but worth a look.
>>>
>>> Or look at http://vispy.org/ -- and give up in MPL :-( -- or maybe not!
>>> form teh vispy docs:
>>>
>>> "Vispy now ships a very basic and experimental OpenGL backend for
>>> matplotlib."
>>>
>>>
>> Yes, and we plan to work on this backend in the next few months. We might
>> have a couple of GSoC students working partly on the OpenGL MPL backend and
>> possibly on Kivy integration.
>>
>>
>>
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>