def get_text_path(self, text: str, font: qg.QFont) -> qg.QPainterPath:
# None is the default font
key = font.key() if font is not None else None
cache = self._text_path_cache[key] # defaultdict(dict)
path = cache.get(text, None)
if path is None:
if font is None:
font = self._default_font
path = qg.QPainterPath()
path.addText(0, 0, font, text)
if self._use_cache:
cache[text] = path
return path
def get_font_measurements(self, font: qg.QFont) -> FontMeasurements:
# None is the default font.
key = font.key() if font is not None else None
measurements = self._font_measurement_cache.get(key)
if measurements is None:
upper_x = self.get_text_rect('X', font)
lower_x = self.get_text_rect('x', font)
lower_p = self.get_text_rect('p', font)
baseline = lower_x.bottom()
measurements = FontMeasurements(
baseline=baseline,
cap_height=baseline - upper_x.top(),
x_height=baseline - lower_x.top(),
descender_height=lower_p.bottom() - baseline,
)
self._font_measurement_cache[key] = measurements
return measurements
