如何在PyGame中响应鼠标点击sprite？

import pygame

# 初始化 Pygame
pygame.init()

# 设置窗口大小
screen_width, screen_height = 800, 600
screen = pygame.display.set_mode((screen_width, screen_height))

# 创建一个 sprite
sprite_image = pygame.Surface((50, 50))
sprite_image.fill((255, 0, 0))
sprite_rect = sprite_image.get_rect()
sprite_rect.center = (screen_width // 2, screen_height // 2)

# 主循环
running = True
while running:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.MOUSEBUTTONDOWN:
            # 获取鼠标光标的位置
            mouse_pos = pygame.mouse.get_pos()
            # 创建鼠标光标的矩形
            mouse_rect = pygame.Rect(mouse_pos[0], mouse_pos[1], 1, 1)
            # 检查鼠标光标的矩形是否与 sprite 碰撞
            if pygame.sprite.collide_rect(sprite_rect, mouse_rect):
                # 更改 sprite 的颜色
                sprite_image.fill((0, 255, 0))

    # 绘制 sprite
    screen.blit(sprite_image, sprite_rect)

    # 更新屏幕
    pygame.display.flip()

# 退出 Pygame
pygame.quit()