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DOC: add example of labelling axes #20147

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May 7, 2021
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DOC: add example of labelling axes #20147

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DOC: add example of labelling axes
jklymak May 4, 2021
9a72a5e
Update examples/text_labels_and_annotations/label_subplots.py
jklymak May 5, 2021
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70 changes: 70 additions & 0 deletions examples/text_labels_and_annotations/label_subplots.py
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"""
==================
Labelling subplots
==================

Labelling subplots is relatively straightforward, and varies,
so Matplotlib does not have a general method for doing this.

Simplest is putting the label inside the axes. Note, here
we use `.pyplot.subplot_mosaic`, and use the subplot labels
as keys for the subplots, which is a nice convenience. However,
the same method works with `.pyplot.subplots` or keys that are
different than what you want to label the subplot with.
"""

import matplotlib.pyplot as plt
import matplotlib.transforms as mtransforms

fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']],
constrained_layout=True)

for label, ax in axs.items():
# label physical distance in and down:
trans = mtransforms.ScaledTranslation(10/72, -5/72, fig.dpi_scale_trans)
ax.text(0.0, 1.0, label, transform=ax.transAxes + trans,
fontsize='medium', verticalalignment='top', fontfamily='serif',
bbox=dict(facecolor='0.7', edgecolor='none', pad=3.0))

plt.show()

##############################################################################
# We may prefer the labels outside the axes, but still aligned
# with each other, in which case we use a slightly different transform:

fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']],
constrained_layout=True)

for label, ax in axs.items():
# label physical distance to the left and up:
trans = mtransforms.ScaledTranslation(-20/72, 7/72, fig.dpi_scale_trans)
ax.text(0.0, 1.0, label, transform=ax.transAxes + trans,
fontsize='medium', va='bottom', fontfamily='serif')

plt.show()

##############################################################################
# If we want it aligned with the title, either incorporate in the title or
# use the *loc* keyword argument:

fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']],
constrained_layout=True)

for label, ax in axs.items():
ax.set_title('Normal Title', fontstyle='italic')
ax.set_title(label, fontfamily='serif', loc='left', fontsize='medium')

plt.show()

#############################################################################
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.figure.Figure.subplot_mosaic` /
# `matplotlib.pyplot.subplot_mosaic`
# - `matplotlib.axes.Axes.set_title`
# - `matplotlib.axes.Axes.text`
# - `matplotlib.transforms.ScaledTranslation`