Only perturb padded tick marks for rectilinear axes

lpsinger · lpsinger · commit 19777769f5c2 · 2013-08-22T10:34:23.000-07:00
The function _get_pixel_distance_along_axis does not work for geographic axes, in which pixels that are outside of the map area cannot be meaningfully transformed back to data coordinates. To be safe, let us just return 0.0 unless we are on rectilinear axes. Fixes #2299.
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
@@ -1657,7 +1657,7 @@ def _get_pixel_distance_along_axis(self, where, perturb):
         # do things correctly, we need to use rmax instead of 1e-10 for a polar axis.  But
         # since we do not have that kind of information at this point, we just don't try to
         # pad anything for the theta axis of a polar plot.
-        if self.axes.name == 'polar':
+        if self.axes.name != 'rectilinear':
            return 0.0
 
         #
@@ -1957,6 +1957,13 @@ def _get_pixel_distance_along_axis(self, where, perturb):
         ticks are lost due to round-off at the extreme ends of an axis.
         """
 
+        # This routine does not work for geographic axes, in which pixels that
+        # are outside of the map area cannot be meaningfully transformed back
+        # to data coordinates. To be safe, let us just return 0.0 unless we
+        # are on rectilinear axes.
+        if self.axes.name != 'rectilinear':
+           return 0.0
+
         #
         # first figure out the pixel location of the "where" point.  We use 1e-10 for the
         # x point, so that we remain compatible with log axes.
