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Tutorial "Plotting data points": Add legend for size coding #4214

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Merged
seisman merged 1 commit into from
Nov 17, 2025
Merged

Tutorial "Plotting data points": Add legend for size coding #4214

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13 changes: 12 additions & 1 deletion examples/tutorials/basics/plot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@
"""

# %%
import io

import pygmt

# %%
Expand Down Expand Up @@ -49,6 +51,11 @@
# array to the ``size`` parameter. Because the magnitude is on a logarithmic
# scale, it helps to show the differences by scaling the values using a power
# law.
#
# A legend for the size of the circles can not be added automatically. But users can
# create an :class:`io.StringIO` object, which can be passed to the ``spec`` parameter
# of :meth:`pygmt.Figure.legend`. For details on creating legends, see the tutorial
# :doc:`multiple-column legend </tutorials/advanced/legends>`.

fig = pygmt.Figure()
fig.basemap(region=region, projection="M15c", frame=True)
Expand All @@ -61,6 +68,10 @@
fill="white",
pen="black",
)
legend = io.StringIO(
"\n".join(f"S 0.4 c {0.02 * 2**m:.2f} - 1p 1 Mw {m}" for m in [3, 4, 5])
)
fig.legend(spec=legend, position="jBR+o0.2c+l2", box=True)
fig.show()

# %%
Expand All @@ -75,7 +86,6 @@
# the earthquakes using :func:`pygmt.makecpt`, then set ``cmap=True`` in
# :meth:`pygmt.Figure.plot` to use the colormap. At the end of the plot, we
# also plot a colorbar showing the colormap used in the plot.
#

fig = pygmt.Figure()
fig.basemap(region=region, projection="M15c", frame=True)
Expand All @@ -91,6 +101,7 @@
pen="black",
)
fig.colorbar(frame="xaf+lDepth (km)")
fig.legend(spec=legend, position="jBR+o0.2c+l2", box=True)
fig.show()

# sphinx_gallery_thumbnail_number = 3
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