Method _make_space

lib/matplotlib/_mathtext.py:2356–2369

(self, percentage: float)

        return [hlist]

    def _make_space(self, percentage: float) -> Kern:
        # 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 normal style so that horizontal spaces don't depend on the
        # current font style.
        # TODO: this should be read from the font file
        state = self.get_state()
        key = (state.font, state.fontsize, state.dpi)
        width = self._em_width_cache.get(key)
        if width is None:
            width = state.fontset.get_quad('normal', state.fontsize, state.dpi)
            self._em_width_cache[key] = width
        return Kern(width * percentage)

    _space_widths = {
        r'\,':         0.16667,   # 3/18 em = 3 mu