matplotlib/matplotlib — pull request #1064 by pelson (2012-08-09 12:31:02+00:00)
Title: Locator interface

I have a need to get ticks for a given range, and the ```matplotlib``` Locator seemed like the perfect fit. Unfortunately, the Locator class needs an Axis to function (even if that Axis is a ```DummyAxis``` instance).

This PR makes it easy for *some* Locators to expose their underlying cleverness without the need for an Axis instance.