如何在没有立方体坐标的情况下找到多边形的质心？

def get_polygon_centroid(vertices):
    total_area = 0.0
    centroid_x = 0.0
    centroid_y = 0.0

    for i in range(len(vertices)):
        current_point = vertices[i]
        next_point = vertices[(i + 1) % len(vertices)]

        area = (current_point[0] * next_point[1]) - (next_point[0] * current_point[1])
        total_area += area

        centroid_x += (current_point[0] + next_point[0]) * area
        centroid_y += (current_point[1] + next_point[1]) * area

    total_area *= 0.5
    centroid_x /= (6 * total_area)
    centroid_y /= (6 * total_area)

    return (centroid_x, centroid_y)