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| 1 | +""" |
| 2 | +================== |
| 3 | +Labelling subplots |
| 4 | +================== |
| 5 | +
|
| 6 | +Labelling subplots is relatively straightforward, and varies, |
| 7 | +so Matplotlib does not have a general method for doing this. |
| 8 | +
|
| 9 | +Simplest is putting the label inside the axes. Note, here |
| 10 | +we use `.pyplot.subplot_mosaic`, and use the subplot labels |
| 11 | +as keys for the subplots, which is a nice convenience. However, |
| 12 | +the same method works with `.pyplot.subplots` or keys that are |
| 13 | +different than what you want to label the subplot with. |
| 14 | +""" |
| 15 | + |
| 16 | +import matplotlib.pyplot as plt |
| 17 | +import matplotlib.transforms as mtransforms |
| 18 | + |
| 19 | +fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']], |
| 20 | + constrained_layout=True) |
| 21 | + |
| 22 | +for label, ax in axs.items(): |
| 23 | + # label physical distance in and down: |
| 24 | + trans = mtransforms.ScaledTranslation(10/72, -5/72, fig.dpi_scale_trans) |
| 25 | + ax.text(0.0, 1.0, label, transform=ax.transAxes + trans, |
| 26 | + fontsize='medium', verticalalignment='top', fontfamily='serif', |
| 27 | + bbox=dict(facecolor='0.7', edgecolor='none', pad=3.0)) |
| 28 | + |
| 29 | +plt.show() |
| 30 | + |
| 31 | +############################################################################## |
| 32 | +# We may prefer the labels outside the axes, but still aligned |
| 33 | +# with each other, in which case we use a slightly different transform: |
| 34 | + |
| 35 | +fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']], |
| 36 | + constrained_layout=True) |
| 37 | + |
| 38 | +for label, ax in axs.items(): |
| 39 | + # label physical distance to the left and up: |
| 40 | + trans = mtransforms.ScaledTranslation(-20/72, 7/72, fig.dpi_scale_trans) |
| 41 | + ax.text(0.0, 1.0, label, transform=ax.transAxes + trans, |
| 42 | + fontsize='medium', va='bottom', fontfamily='serif') |
| 43 | + |
| 44 | +plt.show() |
| 45 | + |
| 46 | +############################################################################## |
| 47 | +# If we want it aligned with the title, either incorporate in the title or |
| 48 | +# use the *loc* keyword argument: |
| 49 | + |
| 50 | +fig, axs = plt.subplot_mosaic([['a)', 'c)'], ['b)', 'c)'], ['d)', 'd)']], |
| 51 | + constrained_layout=True) |
| 52 | + |
| 53 | +for label, ax in axs.items(): |
| 54 | + ax.set_title('Normal Title', fontstyle='italic') |
| 55 | + ax.set_title(label, fontfamily='serif', loc='left', fontsize='medium') |
| 56 | + |
| 57 | +plt.show() |
| 58 | + |
| 59 | +############################################################################# |
| 60 | +# |
| 61 | +# .. admonition:: References |
| 62 | +# |
| 63 | +# The use of the following functions, methods, classes and modules is shown |
| 64 | +# in this example: |
| 65 | +# |
| 66 | +# - `matplotlib.figure.Figure.subplot_mosaic` / |
| 67 | +# `matplotlib.pyplot.subplot_mosaic` |
| 68 | +# - `matplotlib.axes.Axes.set_title` |
| 69 | +# - `matplotlib.axes.Axes.text` |
| 70 | +# - `matplotlib.transforms.ScaledTranslation` |
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