def effective_point_size_for_width(
font: QFont, width: float, width_for_font: Callable[[QFont], float],
step=1.0, minsize=1.,
) -> float:
start = max(QFontInfo(font).pointSizeF(), minsize)
font.setPointSizeF(start)
fix = 0
while width_for_font(font) > width and start - (fix + step) >= minsize:
fix += step
font.setPointSizeF(start - fix)
return QFontInfo(font).pointSizeF()
def font_resize(font, factor, minsize=None, maxsize=None):
font = QFont(font)
fontinfo = QFontInfo(font)
size = fontinfo.pointSizeF() * factor
if minsize is not None:
size = max(size, minsize)
if maxsize is not None:
size = min(size, maxsize)
font.setPointSizeF(size)
return font
def effective_point_size_for_height(
font: QFont, height: float, step=0.25, minsize=1.
) -> float:
font = QFont(font)
start = max(math.ceil(height), minsize)
font.setPointSizeF(start)
fix = 0
while QFontMetrics(font).height() > height and start - (fix + step) > minsize:
fix += step
font.setPointSizeF(start - fix)
return QFontInfo(font).pointSizeF()