如何在Pygame中将对象与其阴影相关联？

import pygame

# 初始化Pygame
pygame.init()

# 设置屏幕尺寸
screen_width, screen_height = 800, 600
screen = pygame.display.set_mode((screen_width, screen_height))

# 加载对象图像
object_image = pygame.image.load('path_to_object_image.png').convert_alpha()

# 创建阴影图像（这里简单示例为黑色，实际应用中可能需要更复杂的处理）
shadow_image = pygame.Surface((object_image.get_width(), object_image.get_height()), pygame.SRCALPHA)
pygame.draw.rect(shadow_image, (0, 0, 0, 128), (0, 0, object_image.get_width(), object_image.get_height()))

# 将阴影图像稍微向下和向右偏移
shadow_offset = (5, 5)
shadow_image = pygame.transform.rotate(shadow_image, -5)  # 可选：旋转阴影以匹配对象的角度

# 创建一个包含对象和阴影的组合图像
combined_image = pygame.Surface((object_image.get_width() + abs(shadow_offset[0]), object_image.get_height() + abs(shadow_offset[1])), pygame.SRCAL维亚)
combined_image.blit(shadow_image, (shadow_offset[0], shadow_offset[1]))
combined_image.blit(object_image, (0, 0))

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

    # 填充屏幕背景色
    screen.fill((255, 255, 255))

    # 绘制组合图像到屏幕上
    screen.blit(combined_image, (screen_width // 2 - combined_image.get_width() // 2, screen_height // 2 - combined_image.get_height() // 2))

    # 更新屏幕显示
    pygame.display.flip()

# 退出Pygame
pygame.quit()