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DOC: Fix text tutorial thumbnails using sphinx_gallery_thumbnail_path #31224

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DOC: Fix text tutorial thumbnails using sphinx_gallery_thumbnail_path #31224

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e65ad63
DOC: Add thumbnails for Text tutorials using sphinx_gallery_thumbnail…
subhash-0000 Mar 6, 2026
f7a1372
DOC: Fix mathtext and fonts thumbnails based on maintainer feedback
subhash-0000 Mar 15, 2026
36e2314
DOC: Fix flake8 E501 and restore UTF-8 charset in fonts.py
subhash-0000 Mar 15, 2026
c214efe
DOC: Restore UTF-8 characters and narrow table in fonts.py
subhash-0000 Mar 15, 2026
cb01436
DOC: Revert mathtext alignment and update font fallback intro
subhash-0000 Mar 17, 2026
a1099ac
DOC: Point usetex.py thumbnail to generated tex_demo gallery image
subhash-0000 Mar 18, 2026
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81 changes: 37 additions & 44 deletions galleries/users_explain/text/fonts.py
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Expand Up @@ -29,22 +29,22 @@

.. table:: Types of Fonts

+--------------------------+----------------------------+-------------------------------+
| Type 1 (PDF with usetex) | Type 3 (PDF/PS) | TrueType (PDF) / Type 42 (PS) |
+==========================+============================+===============================+
| Old font types introduced by Adobe. | Newer font type introduced by |
| | Apple; commonly used today. |
+--------------------------+----------------------------+-------------------------------+
| Restricted subset of | Full PostScript language, | Includes a virtual machine |
| PostScript, charstrings | allows embedding arbitrary | that can execute code. |
| are in bytecode. | code. | |
+--------------------------+----------------------------+-------------------------------+
| Supports font hinting. | Does not support font | Supports font hinting, |
| | hinting. | through the virtual machine. |
+--------------------------+----------------------------+-------------------------------+
| Subsetted by code in | Subsetted via external module |
| `matplotlib._type1font`. | `fontTools <https://github.com/fonttools/fonttools>`__. |
+--------------------------+----------------------------+-------------------------------+
+------------------------+--------------------------+-----------------------------+
| Type 1 (PDF usetex) | Type 3 (PDF/PS) | TrueType (PDF) / Type 42 PS |
+========================+==========================+=============================+
| Old font types introduced by Adobe. | Newer font type introduced |
| | by Apple; commonly used. |
+------------------------+--------------------------+-----------------------------+
| Restricted subset of | Full PostScript language,| Includes a virtual machine |
| PostScript, | allows embedding | that can execute code. |
| charstrings in bytecode| arbitrary code. | |
+------------------------+--------------------------+-----------------------------+
| Supports font hinting. | Does not support font | Supports font hinting, via |
| | hinting. | the virtual machine. |
+------------------------+--------------------------+-----------------------------+
| Subsetted by code in | Subsetted via external module |
| `_type1font`. | `fontTools <https://github.com/fonttools/fonttools>`__. |
+------------------------+--------------------------+-----------------------------+

.. note::

Expand Down Expand Up @@ -155,32 +155,25 @@
Font fallback
-------------

There is no font that covers the entire Unicode space thus it is possible for the
users to require a mix of glyphs that cannot be satisfied from a single font.
While it has been possible to use multiple fonts within a Figure, on distinct
`.Text` instances, it was not previous possible to use multiple fonts in the
same `.Text` instance (as a web browser does). As of Matplotlib 3.6 the Agg,
SVG, PDF, and PS backends will "fallback" through multiple fonts in a single
`.Text` instance:

.. plot::
:include-source:
:caption: The string "There are 几个汉字 in between!" rendered with 2 fonts.

fig, ax = plt.subplots()
ax.text(
.5, .5, "There are 几个汉字 in between!",
family=['DejaVu Sans', 'Noto Sans CJK JP', 'Noto Sans TC'],
ha='center'
)

Internally this is implemented by setting The "font family" on
`.FontProperties` objects to a list of font families. A (currently)
private API extracts a list of paths to all of the fonts found and then
constructs a single `.ft2font.FT2Font` object that is aware of all of the fonts.
Each glyph of the string is rendered using the first font in the list that
contains that glyph.

A majority of this work was done by Aitik Gupta supported by Google Summer of
Code 2021.
As of Matplotlib 3.6 the Agg, SVG, PDF, and PS backends will "fallback" through multiple fonts in a single `.Text` instance. For example, the string "There are 几个汉字 in between!" is rendered with 2 fonts:
""" # noqa: E501

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.text(
.5, .5, "There are 几个汉字 in between!",
family=['DejaVu Sans', 'Noto Sans CJK JP', 'Noto Sans TC'],
ha='center'
)

# %%
# Internally this is implemented by setting The "font family" on
# `.FontProperties` objects to a list of font families. A (currently)
# private API extracts a list of paths to all of the fonts found and then
# constructs a single `.ft2font.FT2Font` object that is aware of all of the fonts.
# Each glyph of the string is rendered using the first font in the list that
# contains that glyph.
#
# A majority of this work was done by Aitik Gupta supported by Google Summer of
# Code 2021.
1 change: 1 addition & 0 deletions galleries/users_explain/text/pgf.py
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Expand Up @@ -263,3 +263,4 @@
.. _LaTeX: http://www.tug.org
.. _TeXLive: http://www.tug.org/texlive/
"""
# sphinx_gallery_thumbnail_path = '_static/pgf_preamble.png'
2 changes: 2 additions & 0 deletions galleries/users_explain/text/usetex.py
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Expand Up @@ -165,3 +165,5 @@
.. _underscore: https://ctan.org/pkg/underscore
.. _Xpdf: http://www.xpdfreader.com/
"""
# sphinx_gallery_thumbnail_path = (
# '/gallery/text_labels_and_annotations/images/sphx_glr_tex_demo_001.png')
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