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实现功能：
运用python的pygame模块实现上方出现一群体的敌机，每个敌机会随机不定时发射子弹，下方是玩家飞机，通过控制方向和发射子弹来摧毁所以敌机，在游戏开始前会有一个计时器（3秒）计时结束，游戏开始，若自己生命值消耗完毕还有敌机存货则显示失败，若生命值没有消耗完毕，敌机已被全部消灭，则显示成功界面！
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("太空侵略者") # 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游戏没有结束 1是玩赢了 -1 是输了 # 定义健康条颜色 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)) # 定义一个文字提示的函数 def draw_text(text, font,
text_col, x, y): img = font.render(text, True, text_col) screen.blit(img, (x,
y)) # 创建太空飞船的类 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 # 设置一个冷却时间变量 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 # 外星人子弹 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") # 根据尺寸缩放 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)) # 将图像加到列表中 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，删除爆炸 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: # 创建随机的外星人子弹 # 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 # 检查所有的敌人是否被消灭
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() # 更新外星人 alien_group.update() #
更新外星人子弹 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()
截图如下（部分）：