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Fix issue with PGF backend not falling back to default LaTeX fonts. #22111

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Fix issue with PGF backend not falling back to default LaTeX fonts. #22111

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2 changes: 2 additions & 0 deletions examples/userdemo/pgf_fonts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,9 @@
=========
"""

import matplotlib as mpl
import matplotlib.pyplot as plt
mpl.use("pgf")
plt.rcParams.update({
"font.family": "serif",
# Use LaTeX default serif font.
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17 changes: 12 additions & 5 deletions lib/matplotlib/backends/backend_pgf.py
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Expand Up @@ -65,11 +65,18 @@ def _get_preamble():
families = ["serif", "sans\\-serif", "monospace"]
commands = ["setmainfont", "setsansfont", "setmonofont"]
for family, command in zip(families, commands):
# 1) Forward slashes also work on Windows, so don't mess with
# backslashes. 2) The dirname needs to include a separator.
path = pathlib.Path(fm.findfont(family))
preamble.append(r"\%s{%s}[Path=\detokenize{%s/}]" % (
command, path.name, path.parent.as_posix()))
try:
# 1) Forward slashes also work on Windows, so do not mess
# with backslashes.
# 2) The dirname needs to include a separator.
path = pathlib.Path(fm.findfont(family,
fallback_to_default=False))
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minor nit: only the findfont call should be wrapped in the try... except; this makes it clearer that you're catching failures of findfont and not e.g. findfont returning an invalid value for Path(). (Plus this avoids the awkward linebreak.)

except ValueError:
# Use default LaTeX font instead
pass
else:
preamble.append(r"\%s{%s}[Path=\detokenize{%s}]" % (
command, path.name, path.parent.as_posix() + "/"))
return "\n".join(preamble)


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