Pygame，Python 3中的对角线精灵移动

import pygame
from pygame.locals import *

# 初始化Pygame
pygame.init()

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

# 创建精灵类
class Sprite(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface((50, 50))
        self.image.fill((255, 0, 0))
        self.rect = self.image.get_rect()
        self.rect.center = (screen_width // 2, screen_height // 2)
        self.speed = 5

    def update(self):
        keys = pygame.key.get_pressed()
        if keys[K_LEFT] and keys[K_UP]:
            self.rect.x -= self.speed
            self.rect.y -= self.speed
        elif keys[K_LEFT] and keys[K_DOWN]:
            self.rect.x -= self.speed
            self.rect.y += self.speed
        elif keys[K_RIGHT] and keys[K_UP]:
            self.rect.x += self.speed
            self.rect.y -= self.speed
        elif keys[K_RIGHT] and keys[K_DOWN]:
            self.rect.x += self.speed
            self.rect.y += self.speed
        elif keys[K_LEFT]:
            self.rect.x -= self.speed
        elif keys[K_RIGHT]:
            self.rect.x += self.speed
        elif keys[K_UP]:
            self.rect.y -= self.speed
        elif keys[K_DOWN]:
            self.rect.y += self.speed

# 创建精灵对象
sprite = Sprite()

# 创建精灵组
all_sprites = pygame.sprite.Group()
all_sprites.add(sprite)

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

    # 更新精灵位置
    all_sprites.update()

    # 绘制精灵和背景
    screen.fill((255, 255, 255))
    all_sprites.draw(screen)
    pygame.display.flip()

# 退出游戏
pygame.quit()