Make barbs draw correctly again (Fixes #5803)

dopplershift · dopplershift · commit ec6910cfaabc · 2016-01-25T17:18:35.000-07:00
Changes to default linewidth/outline for polygons caused barbs to not be
drawn, since they relied on the previous default linewidth of 1. Now we
pass a linewidth of 1 unless explicitly overridden.
diff --git a/lib/matplotlib/quiver.py b/lib/matplotlib/quiver.py
@@ -922,6 +922,11 @@ def __init__(self, ax, *args, **kw):
             kw['edgecolors'] = barbcolor
             kw['facecolors'] = flagcolor
 
+        # Explicitly set a line width if we're not given one, otherwise
+        # polygons are not outlined and we get no barbs
+        if 'linewidth' not in kw and 'lw' not in kw:
+            kw['linewidth'] = 1
+
         # Parse out the data arrays from the various configurations supported
         x, y, u, v, c = _parse_args(*args)
         self.x = x
