Small cleanups to axislines docs.

Note that get_label_{offset_transform,pos} only ever existed in very old
versions of axisartist; get_axislabel_{transform,pos_angle} are what's
been used ever since then.

Author: anntzer

lib/mpl_toolkits/axisartist/axislines.py

@@ -52,48 +52,35 @@
 
 class AxisArtistHelper:
     """
-    AxisArtistHelper should define
-    following method with given APIs. Note that the first axes argument
-    will be axes attribute of the caller artist.::
+    Axis helpers should define the methods listed below.  The *axes* argument
+    will be the axes attribute of the caller artist.
 
+    ::
 
-        # LINE (spinal line?)
-
-        def get_line(self, axes):
-            # path : Path
-            return path
+        # Construct the spine.
 
         def get_line_transform(self, axes):
-            # ...
-            # trans : transform
-            return trans
+            return transform
 
-        # LABEL
+        def get_line(self, axes):
+            return path
 
-        def get_label_pos(self, axes):
-            # x, y : position
-            return (x, y), trans
+        # Construct the label.
 
+        def get_axislabel_transform(self, axes):
+            return transform
 
-        def get_label_offset_transform(self,
-                axes,
-                pad_points, fontprops, renderer,
-                bboxes,
-                ):
-            # va : vertical alignment
-            # ha : horizontal alignment
-            # a : angle
-            return trans, va, ha, a
+        def get_axislabel_pos_angle(self, axes):
+            return (x, y), angle
 
-        # TICK
+        # Construct the ticks.
 
         def get_tick_transform(self, axes):
-            return trans
+            return transform
 
         def get_tick_iterators(self, axes):
-            # iter : iterable object that yields (c, angle, l) where
-            # c, angle, l is position, tick angle, and label
-
+            # A pair of iterables (one for major ticks, one for minor ticks)
+            # that yield (tick_position, tick_angle, tick_label).
             return iter_major, iter_minor
     """
 
@@ -117,10 +104,7 @@ class Fixed(_Base):
                                     top=(0, 1))
 
         def __init__(self, loc, nth_coord=None):
-            """
-            nth_coord = along which coordinate value varies
-            in 2D, nth_coord = 0 ->  x axis, nth_coord = 1 -> y axis
-            """
+            """``nth_coord = 0``: x-axis; ``nth_coord = 1``: y-axis."""
             _api.check_in_list(["left", "right", "bottom", "top"], loc=loc)
             self._loc = loc