Slightly tighten the Bbox API.

anntzer · anntzer · commit c0e2b02dc50f · 2019-06-13T09:56:27.000+02:00
Bbox.is_unit was added in 23588bf but never, ever used.
diff --git a/doc/api/next_api_changes/2019-06-13-AL.rst b/doc/api/next_api_changes/2019-06-13-AL.rst
@@ -0,0 +1,6 @@
+Deprecations
+````````````
+
+``BboxBase.is_unit`` is deprecated (check the Bbox extents if needed).
+
+``axes3d.unit_bbox`` is deprecated (use ``Bbox.unit`` instead).
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -278,6 +278,7 @@ def frozen(self):
     def __array__(self, *args, **kwargs):
         return self.get_points()
 
+    @cbook.deprecated("3.2")
     def is_unit(self):
         """Return whether this is the unit box (from (0, 0) to (1, 1))."""
         return self.get_points().tolist() == [[0., 0.], [1., 1.]]
diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -32,6 +32,7 @@
 from . import axis3d
 
 
+@cbook.deprecated("3.2", alternative="Bbox.unit()")
 def unit_bbox():
     box = Bbox(np.array([[0, 0], [1, 1]]))
     return box
@@ -82,10 +83,10 @@ def __init__(
         self.initial_elev = elev
         self.set_proj_type(proj_type)
 
-        self.xy_viewLim = unit_bbox()
-        self.zz_viewLim = unit_bbox()
-        self.xy_dataLim = unit_bbox()
-        self.zz_dataLim = unit_bbox()
+        self.xy_viewLim = Bbox.unit()
+        self.zz_viewLim = Bbox.unit()
+        self.xy_dataLim = Bbox.unit()
+        self.zz_dataLim = Bbox.unit()
         # inhibit autoscale_view until the axes are defined
         # they can't be defined until Axes.__init__ has been called
         self.view_init(self.initial_elev, self.initial_azim)
