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[Bug]: Warning: Font Family not found #20850

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FranzForstmayr opened this issue Aug 17, 2021 · 4 comments · May be fixed by #20945
Open

[Bug]: Warning: Font Family not found #20850

FranzForstmayr opened this issue Aug 17, 2021 · 4 comments · May be fixed by #20945
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backend/pgf Documentation Good first issue topic: text/fonts

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@FranzForstmayr
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@FranzForstmayr FranzForstmayr commented Aug 17, 2021

Bug summary

Usign Latex fonts as recommended here throws a Warning:

findfont: Font family ['serif'] not found. Falling back to DejaVu Sans.
findfont: Generic family 'serif' not found because none of the following families were found:

Code for reproduction

import matplotlib.pyplot as plt

plt.rcParams.update({
    "font.family": "serif",
    # Use LaTeX default serif font.
    "font.serif": [],
    # Use specific cursive fonts.
    "font.cursive": ["Comic Neue", "Comic Sans MS"],
})

plt.figure()
plt.plot([1,2,3,4])
plt.savefig('test.png')
plt.savefig('test.pgf')

Actual outcome

The Bug is also visible in your Docs.
https://matplotlib.org/stable/gallery/userdemo/pgf_fonts.html

Expected outcome

No Warning should get thrown everytime

Operating system

Ubuntu

Matplotlib Version

3.4.2

Matplotlib Backend

TkAgg

Python version

3.9.5

Jupyter version

No response

Other libraries

No response

Installation

pip

Conda channel

No response
@FranzForstmayr
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@FranzForstmayr FranzForstmayr commented Aug 17, 2021

Similar to #13139

@aitikgupta
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@aitikgupta aitikgupta commented Aug 29, 2021

Adding documentation tag since the example itself is slightly incorrect..
When you did:

    "font.family": "serif",
    "font.serif": [],

It's really overriding the default Matplotlib serif font-family as an empty list; whereas it really should've been untouched (i.e., the defaults mentioned at: https://matplotlib.org/stable/tutorials/text/usetex.html#sphx-glr-tutorials-text-usetex-py)

I'm not sure why the example was designed in this way.. if the fonts were available you should've got a PGF/PDF with these fonts:

pdffonts pgf_fonts.pdf                                                                                             
name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
BXGEVL+DejaVuSerif                   Type 3            Custom           yes yes no      52  0
GCWXDV+DejaVuSans-Oblique            Type 3            Custom           yes yes no      23  0
FJGZKM+DejaVuSansMono                Type 3            Custom           yes yes no      40  0
BMQQDV+DejaVuSans                    Type 3            Custom           yes yes no      28  0
TVXSBT+ComicNeue-Regular             Type 3            Custom           yes yes no      15  0

However, with the current example; serif font-family isn't found (because the list is essentially empty!); this is what you get:

$ pdffonts pgf_fonts.pdf               
name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
BMQQDV+DejaVuSans                    Type 3            Custom           yes yes no      28  0
GCWXDV+DejaVuSans-Oblique            Type 3            Custom           yes yes no      23  0
FJGZKM+DejaVuSansMono                Type 3            Custom           yes yes no      51  0
TVXSBT+ComicNeue-Regular             Type 3            Custom           yes yes no      15  0

Note the missing serif font...

Fix is pretty simple, something like:

 import matplotlib.pyplot as plt
 plt.rcParams.update({
+    # Use LaTeX default serif font-family.
+    # https://matplotlib.org/stable/tutorials/text/usetex.html#sphx-glr-tutorials-text-usetex-py
     "font.family": "serif",
-    # Use LaTeX default serif font.
-    "font.serif": [],
     # Use specific cursive fonts.
     "font.cursive": ["Comic Neue", "Comic Sans MS"],
 })

You're welcome to create a PR :)

@FranzForstmayr
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@FranzForstmayr FranzForstmayr commented Aug 30, 2021

I'll go for it

FranzForstmayr added a commit to FranzForstmayr/matplotlib that referenced this issue Aug 30, 2021
@FranzForstmayr
Fix matplotlib#20850
0bff071 
Do not remove serif font family in pgf example to avoid Warning
@FranzForstmayr FranzForstmayr linked a pull request that will close this issue Aug 30, 2021
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@Xarthisius Xarthisius mentioned this issue Aug 30, 2021
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@urrameu
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@urrameu urrameu commented Sep 6, 2021

Adding documentation tag since the example itself is slightly incorrect.
[...]
It's really overriding the default Matplotlib serif font-family as an empty list; whereas it really should've been untouched

The empy list is suggested here: https://matplotlib.org/stable/tutorials/text/pgf.html (section "Font specification"). So, either this is correct or that section of the documentation should also be modified. In any case,

FranzForstmayr added a commit to FranzForstmayr/matplotlib that referenced this issue Sep 27, 2021
@FranzForstmayr
Revert "Fix matplotlib#20850"
aa75590 
This reverts commit 0bff071.
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Do not remove serif font family in pgf example to avoid Warning
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@QuLogic @urrameu @FranzForstmayr @aitikgupta