要实现该功能：

运用python的pygame该模块意识到一组敌机出现在顶部。每架敌机都随机不规则地发射子弹。底部是球员平面。它通过控制方向和发射子弹摧毁所有敌机。比赛开始前会有计时器(3秒）计时结束，游戏开始。如果你的生命值被消耗了，并且仍然有敌机库存，那么它将显示失败。如果你的生命值没有被消耗，并且所有敌机都被摧毁，那么成功界面将会显示！

代码如下：

import pygame from pygame import mixer from pygame.locals import * import sys import random

定义帧

clock = pygame.time.Clock() fps = 60

pygame.mixer.pre_init(44100, -16, 2, 512) pygame.init() screen_width = 400 screen_height = 600

screen = pygame.display.set_mode((screen_width, screen_height)) pygame.display.set_caption("太空入侵者")

定义字体

font30 = pygame.font.SysFont("Constantia", 30) font40 = pygame.font.SysFont("Constantia", 40)

加载音效

explosion_fx = pygame.mixer.Sound("img/explosion.wav") explosion_fx.set_volume(0.25)

explosion2_fx = pygame.mixer.Sound("img/explosion2.wav") explosion2_fx.set_volume(0.25)

laser_fx = pygame.mixer.Sound("img/laser.wav") laser_fx.set_volume(0.25)

explosion_fx_ship = pygame.mixer.Sound("img/explosion.wav") explosion_fx_ship.set_volume(1)

定义游戏变量

rows = 5 cols = 5 alien_cooldown = 1000 last_alien_shot = pygame.time.get_ticks() countdown = 3 last_count = pygame.time.get_ticks() game_over = 0 # 0比赛还没结束 1是玩赢了 -1 是输了

定义健康栏颜色

red = (255, 0, 0) green = (0, 255, 0) white = (255, 255, 255)

加载图片

bg = pygame.image.load("img/bg.png")

def draw_bg(): screen.blit(bg, (0, 0))

定义文本提示的函数

def draw_text(text, font, text_col, x, y): img = font.render(text, True, text_col) screen.blit(img, (x, y))

创建一类太空船

class Spaceship(pygame.sprite.Sprite): def __init__(self, x, y, health): super().__init__() self.image = pygame.image.load("img/spaceship.png") self.rect = self.image.get_rect() self.rect.center = [x, y] self.health_start = health self.health_remaining = health self.last_shot = pygame.time.get_ticks()

def update(self):
    # 设置移动速度
    speed = 8

    # 设置冷却时间变量
    cooldown = 500 # 毫秒
    game\_over = 0
    # 按键
    key = pygame.key.get\_pressed()
    if key[pygame.K\_LEFT] and self.rect.left > 0:
        self.rect.x -= speed
    if key[pygame.K\_RIGHT] and self.rect.right < screen\_width:
        self.rect.x += speed

    # 记录当前时间
    time\_now = pygame.time.get\_ticks()

    # 发射子弹
    if key[pygame.K\_SPACE] and time\_now - self.last\_shot > cooldown:
        laser\_fx.play()
        bullet = Bullets(self.rect.centerx, self.rect.top)
        bullet\_group.add(bullet)
        self.last\_shot = time\_now

    # 创建蒙版
    self.mask = pygame.mask.from\_surface(self.image)

    # 画健康条
    pygame.draw.rect(screen, red, (self.rect.x, (self.rect.bottom + 10), self.rect.width, 15))
    if self.health\_remaining > 0:
        pygame.draw.rect(screen, green, (self.rect.x, (self.rect.bottom + 10), int(self.rect.width * (self.health\_remaining / self.health\_start)), 15))
    elif self.health\_remaining <= 0:
        explosion = Explosion(self.rect.centerx, self.rect.centery, 3)
        explosion\_group.add(explosion)
        explosion\_fx\_ship.play()
        self.kill()
        game\_over = -1
    return game\_over

创建子弹

class Bullets(pygame.sprite.Sprite): def __init__(self, x, y): super().__init__() self.image = pygame.image.load("img/bullet.png") self.rect = self.image.get_rect() self.rect.center = [x, y] def update(self): self.rect.y -= 5 if self.rect.bottom < 0: self.kill()

    if pygame.sprite.spritecollide(self, alien\_group, True):
        self.kill()
        explosion\_fx.play()
        explosion = Explosion(self.rect.centerx, self.rect.centery, 2)
        explosion\_group.add(explosion)

创建外星人

class Aliens(pygame.sprite.Sprite): def __init__(self, x, y): super().__init__() self.image = pygame.image.load("img/alien" + str(random.randint(1, 5)) + ".png") self.rect = self.image.get_rect() self.rect.center = [x, y] self.move_counter = 0 self.move_direction = 1

def update(self):
    self.rect.x += self.move\_direction
    self.move\_counter += 1
    if abs(self.move\_counter) > 40:
        self.move\_direction *= -1
        self.move\_counter *= self.move\_direction

异形项目符号

class Alien_Bullets(pygame.sprite.Sprite): def __init__(self, x, y): super().__init__() self.image = pygame.image.load("img/alien_bullet.png") self.rect = self.image.get_rect() self.rect.center = [x, y] def update(self): self.rect.y += 2 if self.rect.top > screen_height: self.kill()

    if pygame.sprite.spritecollide(self, spaceship\_group, False, pygame.sprite.collide\_mask):
        self.kill()
        explosion2\_fx.play()
        # 减少健康条
        spaceship.health\_remaining -= 1
        explosion = Explosion(self.rect.centerx, self.rect.centery, 1)
        explosion\_group.add(explosion)

创建爆炸类

class Explosion(pygame.sprite.Sprite): def __init__(self, x, y, size): super().__init__() self.images = [] for num in range(1, 6): img = pygame.image.load(f"img/exp{num}.png")

根据大小缩放

        if size == 1:
            img = pygame.transform.scale(img, (20, 20))
        if size == 2:
            img = pygame.transform.scale(img, (40, 40))
        if size == 3:
            img = pygame.transform.scale(img, (160, 160))
        # 将图像添加到列表
        self.images.append(img)
    self.index = 0
    self.image = self.images[self.index]
    self.rect = self.image.get\_rect()
    self.rect.center = [x, y]
    self.counter = 0

def update(self):
    explosion\_speed = 3
    # 更新爆炸动画
    self.counter += 1
    if self.counter >= explosion\_speed and self.index < len(self.images) - 1:
        self.counter = 0
        self.index += 1
        self.image = self.images[self.index]
    # 如果动画完成，请移除爆炸
    if self.index >= len(self.images) - 1 and self.counter >= explosion\_speed:
        self.kill()

create sprite groups

spaceship_group = pygame.sprite.Group() bullet_group = pygame.sprite.Group() alien_group = pygame.sprite.Group() alien_bullet_group = pygame.sprite.Group() explosion_group = pygame.sprite.Group()

创建飞船

spaceship = Spaceship(screen_width // 2, screen_height - 80, 3) spaceship_group.add(spaceship)

def create_aliens(): for row in range(rows): for item in range(cols): alien = Aliens(item 70 + 50, row 60 + 50) alien_group.add(alien)

create_aliens() run = True while run: clock.tick(fps)

画背景色

draw\_bg()
if countdown == 0:
    # 创建随机的异形项目符号
    # 记录当前时间
    time\_now = pygame.time.get\_ticks()
    # 发射子弹
    if time\_now - last\_alien\_shot > alien\_cooldown and len(alien\_bullet\_group) < 5 and len(alien\_group) > 0:
        attacking\_alien = random.choice(alien\_group.sprites())
        alien\_bullet = Alien\_Bullets(attacking\_alien.rect.centerx, attacking\_alien.rect.bottom)
        alien\_bullet\_group.add(alien\_bullet)
        last\_alien\_shot = time\_now
    # 检查是否所有敌人都被摧毁
    if len(alien\_group) == 0:
        game\_over = 1
    if game\_over == 0:
        # 更新飞船
        game\_over = spaceship.update()

        # 更新子弹
        bullet\_group.update()

        # 更新外国人
        alien\_group.update()

        # 更新异形项目符号
        alien\_bullet\_group.update()
    else:
        if game\_over == -1:
            draw\_text("GET OVER!", font40, white, int(screen\_width / 2 - 110), int(screen\_height / 2 + 50))
        if game\_over == 1:
            draw\_text("YOU WIN!", font40, white, int(screen\_width / 2 - 110), int(screen\_height / 2 + 50))

if countdown > 0:
    draw\_text("GET READY!", font40, white, int(screen\_width / 2 - 110), int(screen\_height / 2 + 50))
    draw\_text(str(countdown), font40, white, int(screen\_width / 2 - 10), int(screen\_height / 2 + 100))
    count\_timer = pygame.time.get\_ticks()
    if count\_timer - last\_count > 1000:
        countdown -= 1
        last\_count = count\_timer

# 更新爆炸
explosion\_group.update()

spaceship\_group.draw(screen)
bullet\_group.draw(screen)
alien\_group.draw(screen)
alien\_bullet\_group.draw(screen)
explosion\_group.draw(screen)

# event handlers
for event in pygame.event.get():
    if event.type == pygame.QUIT:
        run = False
        pygame.quit()
        sys.exit()
pygame.display.update()

以下屏幕截图（部分）：