如何用火焰库在正方形上做一个蓝色的半透明覆盖

import pygame
from pygame.locals import *

# 初始化Pygame
pygame.init()

# 创建一个正方形的窗口
window_size = (500, 500)
window = pygame.display.set_mode(window_size)
pygame.display.set_caption("Blue Transparent Overlay")

# 创建一个蓝色的半透明覆盖层
overlay_color = (0, 0, 255)  # 蓝色
overlay_alpha = 128  # 半透明度
overlay_surface = pygame.Surface(window_size, pygame.SRCALPHA)
overlay_surface.fill((overlay_color[0], overlay_color[1], overlay_color[2], overlay_alpha))

# 将覆盖层放置在正方形上方
square_size = (300, 300)
square_position = ((window_size[0] - square_size[0]) // 2, (window_size[1] - square_size[1]) // 2)
window.blit(overlay_surface, square_position)

# 更新窗口
pygame.display.flip()

# 游戏循环
running = True
while running:
    for event in pygame.event.get():
        if event.type == QUIT:
            running = False

# 退出Pygame
pygame.quit()