帮我生成一份飞机大战中敌机可以自动发射子弹的代码

好的，以下是一个简单的示例代码，实现了敌机自动发射子弹的功能：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 游戏窗口尺寸
WINDOW_WIDTH = 480
WINDOW_HEIGHT = 800

# 创建游戏窗口
screen = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption('飞机大战')

# 加载图片资源
background_img = pygame.image.load('images/background.png')
player_img = pygame.image.load('images/player.png')
bullet_img = pygame.image.load('images/bullet.png')
enemy_img = pygame.image.load('images/enemy.png')

# 定义游戏角色类
class Actor:
    def __init__(self, img, x, y):
        self.img = img
        self.rect = img.get_rect()
        self.rect.centerx = x
        self.rect.centery = y

    def draw(self, screen):
        screen.blit(self.img, self.rect)

# 定义玩家类
class Player(Actor):
    def __init__(self, img, x, y):
        super().__init__(img, x, y)
        self.speed = 5
        self.bullets = []

    def move_left(self):
        self.rect.centerx -= self.speed

    def move_right(self):
        self.rect.centerx += self.speed

    def fire(self):
        bullet = Bullet(bullet_img, self.rect.centerx, self.rect.top)
        self.bullets.append(bullet)

    def draw_bullets(self, screen):
        for bullet in self.bullets:
            bullet.move()
            bullet.draw(screen)
            if bullet.rect.bottom < 0:
                self.bullets.remove(bullet)

# 定义子弹类
class Bullet(Actor):
    def __init__(self, img, x, y):
        super().__init__(img, x, y)
        self.speed = 10

    def move(self):
        self.rect.centery -= self.speed

# 定义敌机类
class Enemy(Actor):
    def __init__(self, img, x, y):
        super().__init__(img, x, y)
        self.speed = 3
        self.direction = random.choice([-1, 1])
        self.fire_interval = 60
        self.fire_countdown = self.fire_interval

    def move(self):
        self.rect.centerx += self.speed * self.direction
        if self.rect.left < 0 or self.rect.right > WINDOW_WIDTH:
            self.direction *= -1
            self.rect.centery += 50

    def fire(self):
        bullet = Bullet(bullet_img, self.rect.centerx, self.rect.bottom)
        return bullet

# 创建玩家对象
player = Player(player_img, WINDOW_WIDTH // 2, WINDOW_HEIGHT - 100)

# 创建敌机列表
enemies = []
for i in range(5):
    enemy = Enemy(enemy_img, random.randint(50, WINDOW_WIDTH - 50), random.randint(-500, -50))
    enemies.append(enemy)

# 游戏主循环
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player.move_left()
            elif event.key == pygame.K_RIGHT:
                player.move_right()
            elif event.key == pygame.K_SPACE:
                player.fire()

    # 绘制背景
    screen.blit(background_img, (0, 0))

    # 绘制玩家
    player.draw(screen)
    player.draw_bullets(screen)

    # 绘制敌机
    for enemy in enemies:
        enemy.move()
        enemy.draw(screen)
        enemy.fire_countdown -= 1
        if enemy.fire_countdown <= 0:
            bullet = enemy.fire()
            player.bullets.append(bullet)
            enemy.fire_countdown = enemy.fire_interval

    # 更新屏幕
    pygame.display.update()

    # 延迟一段时间，控制游戏帧率
    pygame.time.delay(10)

这段代码实现了一个简单的飞机大战游戏，其中敌机会自动发射子弹。你可以将代码保存为一个 Python 文件，然后在命令行中运行该文件，即可开始游戏。希望能够帮到你！