Remove mathtext_fallback figure keyword

docs/fonts.py

@@ -67,19 +67,23 @@
 # :ref:`default proplotrc file <ug_proplotrc>`.
 #
 # To compare different fonts, use the `~proplot.demos.show_fonts` command with the
-# `family` keyword (default behavior is ``family='sans-serif'``). Tables of the
-# TeX Gyre and sans-serif fonts packaged with proplot are shown below. The "¤" symbol
-# appears where characters for a particular font are unavailable (when making plots,
-# "¤" is replaced with the character from a fallback font). Since most TeX Gyre fonts
-# have limited character sets, if your plots contain lots of mathematical symbols,
-# you may want to set :rcraw:`font.family` to the matplotlib-packaged
-# font ``'DejaVu Sans'`` or the proplot-packaged font ``'Fira Math'``
-# (see `this page <https://github.com/firamath/firamath>`__ for more on Fira Math).
+# `family` keyword (default behavior is ``family='sans-serif'``). Tables of the TeX
+# Gyre and sans-serif fonts packaged with proplot are shown below. In order to show how
+# the fonts perform as math text, the demo is rendered with :rcraw:`mathtext.default`
+# = ``'regular'``, :rcraw:`mathtext.fontset` = ``'custom'``, and
+# :rcraw:`mathtext.fallback` = ``None``. This uses the global :rcraw:`font.family`
+# for the math text and shows a dummy glyph "¤" is shown where math characters
+# are unavailable (see the matplotlib `math text guide
+# <https://matplotlib.org/stable/tutorials/text/mathtext.html#custom-fonts>`__
+# for details). In practice, proplot uses a standard non-italicized math
+# text everywhere by setting :rc:`mathtext.fontset` = ``'stixsans'`` and
+# :rcraw:`mathtext.default = 'rm'` (see the :ref:`proplotrc file <ug_proplotrc>`
+# for details).
 #
 # .. note::
 #
-#    Try to avoid ``.ttf`` files with ``Thin`` in the file name. Some versions of
-#    matplotlib interpret fonts with the "thin" style as having *normal* weight (see
+#    Try to avoid "thin" ``.ttf`` files. Some versions of matplotlib
+#    interpret fonts with the "thin" style as having *normal* weight (see
 #    `this issue page <https://github.com/matplotlib/matplotlib/issues/8788>`__),
 #    causing them to override the correct normal weight versions. While proplot
 #    tries to filter out these files, this cannot be done systematically. In the

proplot/axes/base.py

@@ -387,12 +387,6 @@
     Whether to include panels when aligning figure "super titles" along the top
     of the subplot grid and when aligning the `spanx` *x* axis labels and
     `spany` *y* axis labels along the sides of the subplot grid.
-mathtext_fallback : bool or str, default: :rc:`mathtext.fallback`
-    Apply this :rcraw:`mathtext.fallback` value when drawing the figure. If
-    ``True`` or string, unavailable glyphs are replaced with a glyph from a
-    fallback font (Computer Modern by default). Otherwise, they are replaced
-    with the "¤" dummy character. For details see this `mathtext tutorial \
-<https://matplotlib.org/stable/tutorials/text/mathtext.html#custom-fonts>`__.
 """
 _rc_init_docstring = """
 """

proplot/demos.py

@@ -14,7 +14,7 @@
 from . import constructor, ui
 from .config import _get_data_folders, rc
 from .internals import ic  # noqa: F401
-from .internals import _not_none, docstring, warnings
+from .internals import _not_none, dependencies, docstring, warnings
 from .utils import to_rgb, to_xyz
 
 __all__ = [
@@ -841,9 +841,9 @@ def show_fonts(
     show_cycles
     show_colors
     """
+    # Select fonts for plotting. Default is to show sans-serif fonts. Otherwise
+    # fonts can be specified as input arguments or with the family keyword
     if not args and family is None:
-        # User fonts and sans-serif fonts. Note all proplot sans-serif
-        # fonts are added to 'font.sans-serif' by default
         args = sorted(
             {
                 font.name for font in mfonts.fontManager.ttflist
@@ -879,7 +879,7 @@ def show_fonts(
             }
         )
 
-    # Text
+    # The default sample text
     if text is None:
         text = (
             'the quick brown fox jumps over a lazy dog' '\n'
@@ -893,12 +893,22 @@ def show_fonts(
             r'$\Phi\phi$ $\Psi\psi$ $\Omega\omega$ !?&#%'
         )
 
+    # Settings for rendering math text
+    ctx = {
+        'mathtext.default': 'regular',
+        'mathtext.fontset': 'custom',
+    }
+    if dependencies._version_mpl < 3.4:
+        ctx['mathtext.fallback_to_cm'] = False
+    else:
+        ctx['mathtext.fallback'] = None
+
     # Create figure
     refheight = 1.2 * (text.count('\n') + 2.5) * size / 72
     fig, axs = ui.subplots(
         refwidth=4.5, refheight=refheight, nrows=len(args), ncols=1, space=0,
-        mathtext_fallback=False
     )
+    fig._render_context.update(ctx)
     axs.format(
         xloc='neither', yloc='neither',
         xlocator='null', ylocator='null', alpha=0

proplot/figure.py

@@ -26,7 +26,6 @@
     _pop_rc,
     _translate_loc,
     context,
-    dependencies,
     docstring,
     texts,
     warnings,
@@ -466,7 +465,7 @@ def _canvas_preprocess(self, *args, **kwargs):
         # call in this function before proceeding with print_figure).
         ctx1 = fig._context_adjusting(cache=(method != 'print_figure'))
         ctx2 = fig._context_authorized()  # backends might call set_constrained_layout()
-        ctx3 = rc.context(fig._mathtext_context)  # draw with figure-specific setting
+        ctx3 = rc.context(fig._render_context)  # draw with figure-specific setting
         with ctx1, ctx2, ctx3:
             fig.auto_layout()
             return func(self, *args, **kwargs)
@@ -715,7 +714,7 @@ def __init__(
         self._is_adjusting = False
         self._is_authorized = False
         self._includepanels = None
-        self._mathtext_context = {}
+        self._render_context = {}
         rc_kw, rc_mode = _pop_rc(kwargs)
         kw_format = _pop_params(kwargs, self._format_signature)
         with self._context_authorized():
@@ -1468,6 +1467,7 @@ def _align_content():  # noqa: E306
             gs._auto_layout_tight(renderer)
         _align_content()
 
+    @warnings._rename_kwargs('0.10', mathtext_fallback='pplt.rc.mathtext_fallback = {}')
     @docstring._snippet_manager
     def format(
         self, axs=None, *,
@@ -1477,7 +1477,7 @@ def format(
         blabels=None, bottomlabels=None, bottomlabels_kw=None,
         tlabels=None, toplabels=None, toplabels_kw=None,
         rowlabels=None, collabels=None,  # aliases
-        includepanels=None, mathtext_fallback=None, **kwargs,
+        includepanels=None, **kwargs,
     ):
         """
         Modify figure-wide labels and call ``format`` for the
@@ -1523,24 +1523,16 @@ def format(
             kw = rc.fill({'facecolor': 'figure.facecolor'}, context=True)
             self.patch.update(kw)
 
-            # Update text drawing behavior
-            if includepanels is not None:
-                self._includepanels = includepanels
-            if mathtext_fallback is not None:
-                if dependencies._version_mpl >= 3.4:
-                    context = {'mathtext.fallback': mathtext_fallback if isinstance(mathtext_fallback, str) else 'cm' if mathtext_fallback else None}  # noqa: E501
-                else:
-                    context = {'mathtext.fallback_to_cm': bool(mathtext_fallback)}
-                self._mathtext_context = context
-
-            # Update super title and label padding
+            # Update super title and label spacing
             pad = rc.find('suptitle.pad', context=True)  # super title
             if pad is not None:
                 self._suptitle_pad = pad
             for side in tuple(self._suplabel_pad):  # super labels
                 pad = rc.find(side + 'label.pad', context=True)
                 if pad is not None:
                     self._suplabel_pad[side] = pad
+            if includepanels is not None:
+                self._includepanels = includepanels
 
             # Update super title and labels text and settings
             suptitle_kw = suptitle_kw or {}