matplotlib/matplotlib — pull request #1293 by pelson (2012-09-21 12:22:55+00:00)
Title: Fixed to contour to support the _as_mpl_transform api.

It turns out a bug fix PR (#1265) broke my own feature PR (#1090) of having an external ```_as_mpl_transform``` api.

Even if this doesn't make it in the final 1.2 cut (i.e. we don't find any issues with RC2), I think it is worth merging into the 1.2 branch.

Because we are so close to a release, I have tried to minimize any changes, hence have not changed the ContourSet's ```transform``` attribute to be private (i.e. ```_transform```).