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fix cmr10 negative sign in cmsy10 (RuntimeWarning: Glyph 8722 missing) #18397

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Merged
merged 7 commits into from
May 14, 2021
Merged

fix cmr10 negative sign in cmsy10 (RuntimeWarning: Glyph 8722 missing) #18397

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71ea0cd
fix cmr10 negative sign in cmsy10
casperdcl Sep 2, 2020
6f362d6
add test
casperdcl Nov 10, 2020
0503854
fix cmr10 test
casperdcl Nov 10, 2020
d4d701a
Update cmr10 minus sign test
casperdcl Nov 17, 2020
5092a8d
fix whitespace
casperdcl Nov 17, 2020
ff0cf3a
debug
casperdcl Nov 18, 2020
3d106ae
fix test config
casperdcl Apr 24, 2021
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5 changes: 5 additions & 0 deletions lib/matplotlib/_mathtext.py
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Original file line number Diff line number Diff line change
Expand Up @@ -519,6 +519,11 @@ def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):
found_symbol = False
font = self._get_font(new_fontname)
if font is not None:
if font.family_name == "cmr10" and uniindex == 0x2212:
# minus sign exists in cmsy10 (not cmr10)
font = get_font(
cbook._get_data_path("fonts/ttf/cmsy10.ttf"))
uniindex = 0xa1
glyphindex = font.get_char_index(uniindex)
if glyphindex != 0:
found_symbol = True
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12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_mathtext.py
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Expand Up @@ -385,3 +385,15 @@ def test_math_fontfamily():
size=24, math_fontfamily='dejavusans')
fig.text(0.2, 0.3, r"$This\ text\ should\ have\ another$",
size=24, math_fontfamily='stix')


def test_mathtext_cmr10_minus_sign():
# cmr10 does not contain a minus sign and used to issue a warning
# RuntimeWarning: Glyph 8722 missing from current font.
mpl.rcParams['font.family'] = 'cmr10'
mpl.rcParams['axes.formatter.use_mathtext'] = True
fig, ax = plt.subplots()
ax.plot(range(-1, 1), range(-1, 1))
with pytest.warns(None) as record:
fig.canvas.draw()
assert len(record) == 0, "\n".join(str(e.message) for e in record)