def get_line_height(font):
    # just a bunch of high and low characters, idk how to do this better
    _, bb_top, _, bb_bottom = font.getbbox("Ålgjpqvy")
    return bb_bottom - bb_top


def min_with_none(*args):
    result = None
    for arg in args:
        if arg is not None:
            if result is None:
                result = arg
            else:
                result = min(result, arg)
    return result


def max_with_none(*args):
    result = None
    for arg in args:
        if arg is not None:
            if result is None:
                result = arg
            else:
                result = max(result, arg)
    return result


def line_intersection(line1, line2):
    # copied from https://stackoverflow.com/a/20677983
    xdiff = (line1[0][0] - line1[1][0], line2[0][0] - line2[1][0])
    ydiff = (line1[0][1] - line1[1][1], line2[0][1] - line2[1][1])

    def det(a, b):
        return a[0] * b[1] - a[1] * b[0]

    div = det(xdiff, ydiff)
    if div == 0:
        print(line1, line2)
        raise Exception('lines do not intersect')

    d = (det(*line1), det(*line2))
    x = det(d, xdiff) / div
    y = det(d, ydiff) / div
    return x, y