matplotlib Code

Fixes colors normalization with 'under' colors in LinearSegmentedColormap (values between -1 and 0 were being made positive due to an int cast).
Thanks to Eoghan Harrington for discovering and supplying the patch!

Fixing polygon shading in mplot3d and simultaneously allowing users to specify alpha values for 3d polygons.
(Shading calculation was applied to the rgba array instead of just rgb)

try to use netcdf4-python

use netcdf4-python if installed to read opendap data.

Merged revisions 8926 via svnmerge from
https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v1_0_maint

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r8926 | mdboom | 2011-01-18 13:59:03 -0500 (Tue, 18 Jan 2011) | 2 lines

Increase tolerance in pcolormesh test.
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Increase tolerance in pcolormesh test.

[DOC] fixed lots of typos in mpl_toolkits

try to use netCDF4 module first before falling back on included NetCDFFile function

add qualification to tissot docstring.

backend_qt4agg: eliminate duplicate call to FigureCanvasAgg.draw()

The basic problem is that the most efficient way to eliminate the
duplication appears to be to do the Agg drawing in the paintEvent,
not in draw(); but then a draw() followed by copy_from_bbox may
result in a copy being made before the Agg draw has occurred.
The solution here is to do that drawing inside copy_from_bbox
when necessary.

Side note: it seems that by using the update() method, the
qt4agg draw() is acting more like draw_idle() than like the draw()
methods in the other interactive backends.