Add function set_min_axis_range()

[taldcroft]

Description

Add a function to set the minimum range of the y- or x-axis limits of a matplotlib Axes object. This is used to prevent the axis limits from being set to a very small range.

Interface impacts

None

Testing

Unit tests

• No unit tests

Functional tests

>>> %matplotlib
Using matplotlib backend: MacOSX
>>> from Ska.Matplotlib import set_min_axis_range
>>> import matplotlib.pyplot as plt
>>> fig, ax = plt.subplots()
>>> ax.plot([0, 1, 2], [0.0, 0.01, -0.02])
>>> set_min_axis_range(ax, 1.0)
>>> set_min_axis_range(ax, 5.0, axis='x')

>>> fig, ax = plt.subplots()
>>> ax.plot([0, 1, 2], [0.0, 0.01, -0.02])
[<matplotlib.lines.Line2D object at 0x7fc8407ebbe0>]
>>> ax.set_ylim(0.1, -0.1)
(0.1, -0.1)
>>> set_min_axis_range(ax, 1.0)

[jeanconn]

To be completely general, I would think the "+" and "-" at the end would need to be handled for the case of flipped axis?

[taldcroft]

Great catch @jeanconn, fixed. I put a new functional test in the description.

[jeanconn]

Probably not perfect for log plots but fine for most use cases.