On 2013/07/08 7:19 PM, Tony Yu wrote:
> This is an idea that's been kicking around in my head for awhile.
> Basically, the Axes class is way too expansive. Nelle made a major step
> in the right direction with a PR that split it up into plotting and
> non-plotting methods:
>
> https://github.com/matplotlib/matplotlib/pull/1931/files
>
> What I'd like to see is something that further separates plotting
> methods into many smaller sub-modules/-packages. Organizing the code
> this way would make it easier (for me at least) to read, understand, and
> make changes to the code.
>
> I think that this could be done in an API-compatible way. In fact, a few
> of the plotting methods are already implemented this way: In other
> words, the bulk of the methods are implemented as functions outside of
> Axes, and the Axes methods that are just thin wrappers around those
> functions (or classes). See, for example, `streamplot`, `barbs`, and
> `quiver` methods

I agree.  I would like to see logical groups of plot types broken out 
into modules.

>
> The examples mentioned above simply take the axes as the first
> parameter. Here's the Axes-method definition of `quiver`, for example:
>
>      def quiver(self, *args, **kw):
>          ...
>          q = mquiver.Quiver(self, *args, **kw)
>          ...
>          return q
>
> (might be a good idea to add a decorator to maintain the function
> signature and docstring)
>
> This should work for any of the plotting methods (I would imagine).
> Another alternative is for all these plotting functions to have an `ax`
> (or some other spelling) keyword argument that defaults to None and then
> have a line in every function that does something like
>
>      ax = ax if ax is not None else plt.gca()
>
> If I'm not mistaken, this would allow pyplot functions to be even
> thinner wrappers around these newly extracted functions. (In some cases,
> it might just be a simple import from the the new sub-package/-module
> into the `pyplot` namespace).
>

This would require pyplot to be imported by everything, wouldn't it? 
That would completely defeat the strategy of having an OO level that 
doesn't know about pyplot at all, and then having pyplot be the thin top 
layer.

Eric

> I haven't sat down and thought through all the details of such a change,
> but I wanted to throw it out there to see if anything sticks.
>
> Cheers,
> -Tony
>
>
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