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Mathtext spaces must be independent of font style. #23482

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Jul 26, 2022
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Mathtext spaces must be independent of font style. #23482

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8 changes: 6 additions & 2 deletions lib/matplotlib/_mathtext.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1935,13 +1935,17 @@ def non_math(self, s, loc, toks):
float_literal = staticmethod(pyparsing_common.convertToFloat)

def _make_space(self, percentage):
# All spaces are relative to em width
# In TeX, an em (the unit usually used to measure horizontal lengths)
# is not the width of the character 'm'; it is the same in different
# font styles (e.g. roman or italic). Mathtext, however, uses 'm' in
# the italic style so that horizontal spaces don't depend on the
# current font style.
state = self.get_state()
key = (state.font, state.fontsize, state.dpi)
width = self._em_width_cache.get(key)
if width is None:
metrics = state.font_output.get_metrics(
state.font, mpl.rcParams['mathtext.default'], 'm',
'it', mpl.rcParams['mathtext.default'], 'm',
state.fontsize, state.dpi)
width = metrics.advance
self._em_width_cache[key] = width
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