Fixes scale calculation to correct pdf rendering failures.

Author: jbbrokaw

lib/mpl_toolkits/mplot3d/axis3d.py

@@ -264,8 +264,11 @@ def draw(self, renderer):
         lxyz = 0.5*(edgep1 + edgep2)
 
         # A rough estimate; points are ambiguous since 3D plots rotate
-        deltas_per_point = 48 / (self.axes.bbox.height + self.axes.bbox.width)
-        default_offset = 31.5
+        ax_scale = self.axes.bbox.size / self.figure.bbox.size
+        ax_inches = np.multiply(ax_scale, self.figure.get_size_inches())
+        ax_points_estimate = sum(72. * ax_inches)
+        deltas_per_point = 48. / ax_points_estimate
+        default_offset = 21.
         labeldeltas = (self.labelpad + default_offset) * deltas_per_point\
             * deltas
         axmask = [True, True, True]
@@ -396,7 +399,7 @@ def draw(self, renderer):
                     renderer.M)
 
             # Get position of label
-            default_offset = 12  # A rough estimate
+            default_offset = 8.  # A rough estimate
             labeldeltas = (tick.get_pad() + default_offset) * deltas_per_point\
                 * deltas
 

lib/mpl_toolkits/tests/baseline_images/test_mplot3d/axes3d_labelpad.png

@@ -250,7 +250,7 @@ def test_axes3d_labelpad():
     ax.set_zlabel('Z LABEL')
     # or manually
     ax.yaxis.labelpad = 20
-    ax.zaxis.labelpad = -60
+    ax.zaxis.labelpad = -40
 
     # Tick labels also respect tick.pad (also from rcParams)
     for i, tick in enumerate(ax.yaxis.get_major_ticks()):