New issue 764: matplotlib.delaunay deprecated in matplotlib 1.4

https://bitbucket.org/yt_analysis/yt/issue/764/matplotlibdelaunay-deprecated...

Nathan Goldbaum:

When running with the current matplotlib github master, importing yt produces the following error:

/Users/goldbaum/Documents/matplotlib/lib/matplotlib/cbook.py:133:
MatplotlibDeprecationWarning: The matplotlib.delaunay module was deprecated
in version 1.4. Use matplotlib.tri.Triangulation instead.

We use matplotlib.delaunay in three places:

goldbaum at ROUS in ~/Documents/yt-hg on yt-3.0 at tip?
☿ grin matplotlib.delaunay
./yt/visualization/plot_modifications.py:
  254 :         from matplotlib.delaunay.triangulate import Triangulation
as triang
./yt/visualization/plot_types.py:
  539 :         import matplotlib.delaunay.triangulate as de
./yt/visualization/plot_window.py:
   23 : from matplotlib.delaunay.triangulate import Triangulation as triang

I attempted to patch this, hoping it would be quick, but unfortunately it looks like the underlying Triangulation class has a somewhat different API now. For example this example from plot_modifications.py no longer works:

zi = self.triang(x,y).nn_interpolator(z)(xi,yi)

because nn_interpolator is no longer defined in the new interface.

There's some explanatory background on this in the matplotlib PR that deprecates matplotlib.delaunay:

https://github.com/matplotlib/matplotlib/pull/2504

which seems to indicate that nearest-neighbor interpolations has been completely removed from matplotlib...

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