Fix Bbox transformation for skewed Axes.

dopplershift · dopplershift · commit da0dce4ea1bc · 2014-03-09T20:56:28.000-06:00
This involves transforming the upper left and lower right points
separately to come up with the combined translated upper right.
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -517,14 +517,17 @@ def transformed(self, transform):
         Return a new :class:`Bbox` object, statically transformed by
         the given transform.
         """
-        return Bbox(transform.transform(self.get_points()))
+        pts = self.get_points()
+        ll, ul, lr = transform.transform(np.array([pts[0],
+            [pts[0, 0], pts[1, 1]], [pts[1, 0], pts[0, 1]]]))
+        return Bbox([ll, [lr[0], ul[1]]])
 
     def inverse_transformed(self, transform):
         """
         Return a new :class:`Bbox` object, statically transformed by
         the inverse of the given transform.
         """
-        return Bbox(transform.inverted().transform(self.get_points()))
+        return self.transformed(transform.inverted())
 
     coefs = {'C':  (0.5, 0.5),
              'SW': (0, 0),
