从光标中心绘制正方形

import pygame

# 初始化Pygame
pygame.init()

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

# 设置正方形边长
square_size = 200

# 获取光标位置
cursor_pos = pygame.mouse.get_pos()

# 计算正方形顶点坐标
top_left = (cursor_pos[0] - square_size/2, cursor_pos[1] - square_size/2)
top_right = (cursor_pos[0] + square_size/2, cursor_pos[1] - square_size/2)
bottom_left = (cursor_pos[0] - square_size/2, cursor_pos[1] + square_size/2)
bottom_right = (cursor_pos[0] + square_size/2, cursor_pos[1] + square_size/2)

# 绘制正方形
pygame.draw.line(screen, (255, 255, 255), top_left, top_right)
pygame.draw.line(screen, (255, 255, 255), top_left, bottom_left)
pygame.draw.line(screen, (255, 255, 255), bottom_left, bottom_right)
pygame.draw.line(screen, (255, 255, 255), top_right, bottom_right)

# 刷新屏幕
pygame.display.flip()

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

# 退出Pygame
pygame.quit()