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Version 2.2.2.post1758+gbc39b1c4a
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Auto Subplots Adjust

Automatically adjust subplot parameters. This example shows a way to determine a subplot parameter from the extent of the ticklabels using a callback on the draw_event.

Note that a similar result would be achieved using tight_layout or contrained_layout; this example shows how one could customize the subplot parameter adjustment.

import matplotlib.pyplot as plt
import matplotlib.transforms as mtransforms
fig, ax = plt.subplots()
labels = ax.set_yticklabels(('really, really, really', 'long', 'labels'))

def on_draw(event):
   bboxes = []
   for label in labels:
       bbox = label.get_window_extent()
       # the figure transform goes from relative coords->pixels and we
       # want the inverse of that
       bboxi = bbox.inverse_transformed(fig.transFigure)

   # this is the bbox that bounds all the bboxes, again in relative
   # figure coords
   bbox = mtransforms.Bbox.union(bboxes)
   if fig.subplotpars.left < bbox.width:
       # we need to move it over
       fig.subplots_adjust(left=1.1*bbox.width) # pad a little
   return False

fig.canvas.mpl_connect('draw_event', on_draw)