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Python: improve math text for labels #15676

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rmcdermo merged 1 commit into from
Dec 5, 2025
+39 −20
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Python: improve math text for labels #15676

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59 changes: 39 additions & 20 deletions Utilities/Python/fdsplotlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -712,9 +712,10 @@ def configure_fds_fonts(**kwargs):
import matplotlib.pyplot as plt
import platform

system = platform.system()
use_tex = kwargs.get('usetex', False)
system = platform.system()

# OS-dependent serif stack
if system == "Linux":
primary_serif = "Nimbus Roman"
serif_list = [
Expand All @@ -732,33 +733,50 @@ def configure_fds_fonts(**kwargs):
"serif",
]

plt.rcParams.update({
"pdf.use14corefonts": True,
"text.usetex": use_tex,
# ------------------------------------------------------------
# Core default config (applies to BOTH branches)
# ------------------------------------------------------------
rc = {
"pdf.use14corefonts": True, # use Base-14 when possible
"text.usetex": use_tex, # route text through TeX or not

"font.family": "serif",
"font.serif": serif_list,
"font.sans-serif": serif_list,

# Mathtext still matters when text.usetex=False
"mathtext.fontset": "custom",
"mathtext.rm": primary_serif,
"mathtext.it": f"{primary_serif}:italic",
"mathtext.bf": f"{primary_serif}:bold",
"mathtext.cal": f"{primary_serif}:italic",
"mathtext.tt": "Courier",
"mathtext.default": "rm",

"axes.unicode_minus": False,
"pdf.compression": 9,
})
}

# Only for usetex=True, insert packages that Times-ify math
if use_tex:
plt.rcParams["text.latex.preamble"] = r"""
\usepackage{newtxtext}
\usepackage{newtxmath}
"""
# ------------------------------------------------------------
# Branch A: NON-TeX Mode (usetex=False)
# Use mathtext for math, STIX for math glyphs
# Keep Times/Nimbus for normal text
# Very small PDFs
# ------------------------------------------------------------
if not use_tex:
rc.update({
"mathtext.fontset": "stix",
"mathtext.default": "it", # italic math by default
})

# ------------------------------------------------------------
# Branch B: Full TeX rendering (usetex=True)
# - Times for body
# - newtxtext/newtxmath to Times-ify math
# - Disable STIX mathtext completely
# ------------------------------------------------------------
else:
rc.update({
"mathtext.fontset": "cm", # or "custom" — anything NOT stix
"mathtext.default": "rm", # don't auto-italic mathtext in TeX mode
"text.latex.preamble": r"""
\usepackage{newtxtext}
\usepackage{newtxmath}
""",
})

plt.rcParams.update(rc)


def plot_to_fig(x_data,y_data,**kwargs):
Expand Down Expand Up @@ -1037,6 +1055,7 @@ def plot_to_fig(x_data,y_data,**kwargs):
plt.setp( ax.yaxis.get_majorticklabels(), rotation=0, fontsize=ticklabel_fontsize )

axeslabel_fontsize=kwargs.get('axeslabel_fontsize',default_axeslabel_fontsize)

if not using_existing_figure:
plt.xlabel(kwargs.get('x_label'), fontsize=axeslabel_fontsize)
plt.ylabel(kwargs.get('y_label'), fontsize=axeslabel_fontsize)
Expand Down