Fix non-linear scaling with pcolormesh and non-Agg backends.

mdboom · mdboom · commit fb5cf7d47d45 · 2008-07-17T18:26:41.000Z
svn path=/trunk/matplotlib/; revision=5777
diff --git a/lib/matplotlib/collections.py b/lib/matplotlib/collections.py
@@ -10,6 +10,7 @@
 """
 import math, warnings
 import numpy as np
+import numpy.ma as ma
 import matplotlib as mpl
 import matplotlib.cbook as cbook
 import matplotlib.colors as _colors # avoid conflict with kwarg
@@ -468,7 +469,11 @@ def convert_mesh_to_paths(meshWidth, meshHeight, coordinates):
         """
         Path = mpath.Path
 
-        c = coordinates
+        if ma.isMaskedArray(coordinates):
+            c = coordinates.data
+        else:
+            c = coordinates
+
         # We could let the Path constructor generate the codes for us,
         # but this is faster, since we know they'll always be the same
         codes = np.array(
