get aspect ratio of axes

Question

Is there an easy and reliable way to determine the current aspect ratio of an axes when its aspect is set to \'auto\'?

The obvious thing to

Answer 1

The best thing I can find is this:

def get_aspect(ax=None):
    if ax is None:
        ax = plt.gca()
    fig = ax.figure

    ll, ur = ax.get_position() * fig.get_size_inches()
    width, height = ur - ll
    axes_ratio = height / width
    aspect = axes_ratio / ax.get_data_ratio()

    return aspect

But it's surprisingly complicated, and I'm not sure if it is reliable under transforms, etc, as I know nothing about the bbox and transform objects.