PR Summary

In 3.x ax.get_tightbbox() started to include all artists on the axes when it was called. This is an expected performance hit. @tacaswell suggested that perhaps if the artist is clipped by the axes patch this is not necessary.

The change here implements that solution - if the artist is clipped and the clip path is contained in the axes clip path, then artist.get_tightbbox() is no longer called for that artist.

Example:

import matplotlib.pyplot as plt
import time
import numpy as np

fig, ax = plt.subplots()

ax.plot(np.arange(2e7) + 1, np.arange(2e7))
ax.set_xlim([1, 40])

st = time.time()
for i in range(40):
    fig.tight_layout()
    plt.draw()
print(time.time() - st)
plt.show()

Old:

18.68

New:

0.4187

PR Checklist

• Has Pytest style unit tests
• Code is Flake 8 compliant
• New features are documented, with examples if plot related
• Documentation is sphinx and numpydoc compliant
• Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
• Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way