Christopher Barker <chris.bar...@noaa.gov> writes:

> Joey Wilson wrote:
>> I would like to be able to save the figures from 
>> matplotlib in an editable form, without flattening down to an image 
>> file. 
>
> I think to do this right, you'd need to completely re-design MPL to be 
> based on a more declarative structure: [...] but it seems that MPL is 
> built to be used from a scripting interface instead: a series of 
> commands that builds the figure.

I don't think that is the real problem. How matplotlib works is that the
plotting commands build up a data structure consisting of various
objects pointing to each other, and when you call show or savefig, the
data structure is traversed and the appropriate backend functions are
called. In principle it should not be very difficult to serialize this
data structure, but since extension objects are involved, some work
might be needed to get it right.

What I think is the really difficult part is keeping the serialized
format somehow usable across different versions of matplotlib. When
anything changes in the various classes, the developers would need to
decide how the change is reflected in the on-disk format, how files
corresponding to the old class should be read in using the new class,
etc. Perhaps something like Google's protocol buffers could be used to
make this easier, but it would still be an burden on all subsequent
development.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks


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