import pygame


def rainbow_spectrum(position):
    relative_pos = position % 1530
    red = max(0, min(255, 510 - relative_pos), min(255, relative_pos - 1020))
    green = max(0, min(255, relative_pos, 1020 - relative_pos))
    blue = max(0, min(255, relative_pos - 510, 1530 - relative_pos))
    return red, green, blue


def main():
    pygame.init()
    clock = pygame.time.Clock()
    window = pygame.display.set_mode((720, 720))
    rainbow_pos = 0

    running = True
    while running:
        clock.tick(60)

        for keyboard_event in pygame.event.get():
            if keyboard_event.type == pygame.QUIT:
                running = False

        rainbow_pos %= 1530
        window.fill(rainbow_spectrum(rainbow_pos))
        rainbow_pos += 4

        pygame.display.flip()

    pygame.quit()