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Thanks Michael and Benjamin — this answers all my questions.  


On Wednesday, October 26, 2011 at 11:11 AM, Michael Droettboom wrote:

> On 10/26/2011 02:40 AM, Benjamin Root wrote:  
> >  
> >  
> > On Tuesday, October 25, 2011, jniemasik <nie...@gm... (mailto:nie...@gm...)> wrote:
> > >
> > > Hi all,
> > >
> > > Google App Engine recently added an experimental Python 2.7 option, and
> > > along with it, support for numpy.
> > >
> > > App Engine only allows pure python code to be uploaded.  But now that numpy
> > > is available on the server, I was hoping I could create a pure python build
> > > of matplotlib that I can run on App Engine.
> > >
> > > Any suggestions on how to do this (existing tutorial, or at least which
> > > backend to use, etc.)?  Is it possible?
> > >
> > > Many thanks,
> > > Jamie
> >  
> > One thing I just noticed is that PIL is available.in (http://available.in) the app engine  I wonder if a PIL based backend might be suitable for replacing the compiled _png.so used for writing png images and maybe some other formats in the app engine?
> With the pure Python backends (PS, PDF, SVG) you should be able to do most things, except actually rasterize an image... but since it's a webapp anyway, SVG should suffice and have it rendered in the client.  Of course there are still pieces that would need to be rewritten in Python -- contouring, path simplification, geometry functions, font handling.  I don't know if the PIL FontImage support would suffice as a replacement for the freetype wrapper we currently have -- otherwise reimplementing freetype in Python (even to just get the font metrics) is probably considerable work.
>  
> In other words, it's possible, but not as it stands without rewriting a lot of C++ code in Python.
>  
> Mike
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