import math


def calc_eyebrow_coordinates(anchor_point, length, angle, width):
    """
    Calculates points of eyebrow
    :param anchor_point: a bottom right (bottom left) point
    :param length: eyebrow length x
    :param angle: brow angle
    :param width: eyebrow thickness
    :return: coordinates
    """
    x1, y1 = anchor_point

    x2 = x1 + length
    y2 = int(y1 - length * math.tan(angle))

    x3 = x2
    y3 = y2 - width

    x4 = x1
    y4 = y1 - width

    return [(x1, y1), (x2, y2), (x3, y3), (x4, y4)]