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最近重温了一下这款小游戏，尽管时隔多年，但无论是游戏的画质还是风格，时至今日依然都不过时。本文我们使用 Python 来实现一下这款小游戏，游戏的实现主要用到第三方模块 pygame，安装使用 pip install pygame 即可。

环境

操作系统：Windows

实现

飞机大战的构成相对比较简单，主要包括：主界面、玩家、敌人、子弹、计分板等，下面来看一下具体实现。

首先我们来绘制一个主界面，主要实现代码如下所示：

# 设置屏幕的宽度SCREEN_WIDTH = 450# 设置屏幕的高度SCREEN_HEIGHT = 600# 初始化窗口pygame.init()# 设置窗口标题pygame.display.set_caption("飞机大战")# 设置屏幕大小screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT), 0, 32)# 隐藏光标pygame.mouse.set_visible(False)# 设置背景bg = pygame.image.load("resources/image/bg.png")# 绘制屏幕screen.fill(0)# 加入背景图片screen.blit(bg, (0, 0))# 设置游戏结束的图片bg_game_over = pygame.image.load("resources/image/bg_game_over.png")# 加载飞机资源图片img_plane = pygame.image.load("resources/image/shoot.png")img_start = pygame.image.load("resources/image/start.png")img_pause = pygame.image.load("resources/image/pause.png")img_icon = pygame.image.load("resources/image/plane.png").convert_alpha()# 顺便设置窗口pygame.display.set_icon(img_icon)# 初始化位置player_pos = [200, 450]

看一下效果：

class Player(pygame.sprite.Sprite):    def __init__(self, img, rect, pos):        pygame.sprite.Sprite.__init__(self)        self.image = []        # 将飞机图片部分分隔        for i in range(len(rect)):            self.image.append(img.subsurface(rect[i]).convert_alpha())        # 获取飞机的区域        self.rect = rect[0]        self.rect.topleft = pos        self.speed = 8        # 生成精灵组实例        self.bullets = pygame.sprite.Group()        self.img_index = 0        # 判断飞机是否被打中        self.is_hit = False    def shoot(self, img):        bullet = Bullet(img, self.rect.midtop)        # 添加子弹实例到玩家的子弹组        self.bullets.add(bullet)    def moveUp(self):        # 当遇到顶部时,设置上顶部为0        if self.rect.top <= 0:            self.rect.top = 0        else:            self.rect.top -= self.speed    def moveDown(self):        # 当遇到底部时,设置一直为常值        if self.rect.top >= SCREEN_HEIGHT - self.rect.height:            self.rect.top = SCREEN_HEIGHT - self.rect.height        else:            self.rect.top += self.speed    def moveLeft(self):        # 当遇到左边时,一直停靠在左边        if self.rect.left <= 0:            self.rect.left = 0        else:            self.rect.left -= self.speed    def moveRight(self):        # 当遇到右边时, 停靠右边        if self.rect.left >= SCREEN_WIDTH - self.rect.width:            self.rect.left = SCREEN_WIDTH - self.rect.width        else:            self.rect.left += self.speed

看一下玩家的飞机样式：

class Bullet(pygame.sprite.Sprite):    def __init__(self, img, pos):        pygame.sprite.Sprite.__init__(self)        self.image = img        # 设置图片的区域        self.rect = self.image.get_rect()        self.rect.midbottom = pos        self.speed = 10    def move(self):        self.rect.top -= self.speed

看一下子弹的样式：

class Enemy(pygame.sprite.Sprite):    def __init__(self, img, explosion_img, pos):        pygame.sprite.Sprite.__init__(self)        self.image = img        self.rect = self.image.get_rect()        self.rect.topleft = pos        self.explosion_img = explosion_img        self.speed = 2        # 设置击毁序列        self.explosion_index = 0    def move(self):        # 敌人的子弹只能一直向下        self.rect.top += self.speed

最后，我们来定义一下游戏运行的相应逻辑，比如：击中敌机、玩家与敌机碰撞、生成分数等，主要实现代码如下所示：

while running:    # 设置游戏帧率为 60    clock.tick(60)    if not is_pause and not is_game_over:        if not player.is_hit:            # 设置连续射击,因为每秒 60 帧,15/60=0.25 秒发一次子弹            if shoot_frequency % 15 == 0:                player.shoot(bullet_img)            shoot_frequency += 1            # 当设置的射击频率大于 15，置零            if shoot_frequency >= 15:                shoot_frequency = 0        # 控制生成敌机的频率        if enemy_frequency % 50 == 0:            # 设置敌机的出现的位置            enemy_pos = [random.randint(0, SCREEN_WIDTH - enemy_rect.width), 0]            enemy = Enemy(enemy_img, enemy_explosion_imgs, enemy_pos)            enemies.add(enemy)        enemy_frequency += 1        if enemy_frequency >= 100:            enemy_frequency = 0        # 控制子弹的显示运行        for bullet in player.bullets:            bullet.move()            if bullet.rect.bottom < 0:                player.bullets.remove(bullet)        # 控制敌机的运行        for enemy in enemies:            enemy.move()            # 判断敌机是否与玩家飞机碰撞            if pygame.sprite.collide_circle(enemy, player):                enemies_explosion.add(enemy)                enemies.remove(enemy)                player.is_hit = True                # 设置玩家的飞机被毁                is_game_over = True            # 判断敌机是否在界面            if enemy.rect.top < 0:                enemies.remove(enemy)        # 设置敌机与玩家的飞机子弹相碰时，返回被击的敌机实例        enemy_explosion = pygame.sprite.groupcollide(enemies, player.bullets, 1, 1)        for enemy in enemy_explosion:            enemies_explosion.add(enemy)    # 绘制屏幕    screen.fill(0)    # 加入背景图片    screen.blit(bg, (0, 0))    # 添加玩家飞机图片到屏幕    if not player.is_hit:        screen.blit(player.image[int(player.img_index)], player.rect)        player.img_index = shoot_frequency / 8    else:        if player_explosion_index > 47:            is_game_over = True        else:            player.img_index = player_explosion_index / 8            screen.blit(player.image[int(player.img_index)], player.rect)            player_explosion_index += 1    # 敌机被子弹击中的效果显示    for enemy in enemies_explosion:        if enemy.explosion_index == 0:            pass        if enemy.explosion_index > 7:            enemies_explosion.remove(enemy)            score += 100            continue        # 敌机被击时显示图片        screen.blit(enemy.explosion_img[int(enemy.explosion_index / 2)], enemy.rect)        enemy.explosion_index += 1    # 显示子弹    player.bullets.draw(screen)    # 显示敌机    enemies.draw(screen)    # 分数的显示效果    score_font = pygame.font.Font(None, 36)    score_text = score_font.render(str(score), True, (128, 128, 128))    # 设置文字框    text_rect = score_text.get_rect()    # 放置文字的位置    text_rect.topleft = [20, 10]    # 显示出分数    screen.blit(score_text, text_rect)    left, middle, right = pygame.mouse.get_pressed()    # 暂停游戏    if right == True and not is_game_over:        is_pause = True    if left == True:        # 重置游戏        if is_game_over:            is_game_over = False            player_rect = []            player_rect.append(pygame.Rect(0, 99, 102, 126))            player_rect.append(pygame.Rect(165, 360, 102, 126))            player_rect.append(pygame.Rect(165, 234, 102, 126))            player_rect.append(pygame.Rect(330, 624, 102, 126))            player_rect.append(pygame.Rect(330, 498, 102, 126))            player_rect.append(pygame.Rect(432, 624, 102, 126))            player = Player(img_plane, player_rect, player_pos)            bullet_rect = pygame.Rect(1004, 987, 9, 21)            bullet_img = img_plane.subsurface(bullet_rect)            enemy_rect = pygame.Rect(534, 612, 57, 43)            enemy_img = img_plane.subsurface(enemy_rect)            enemy_explosion_imgs = []            enemy_explosion_imgs.append(img_plane.subsurface(pygame.Rect(267, 347, 57, 43)))            enemy_explosion_imgs.append(img_plane.subsurface(pygame.Rect(873, 697, 57, 43)))            enemy_explosion_imgs.append(img_plane.subsurface(pygame.Rect(267, 296, 57, 43)))            enemy_explosion_imgs.append(img_plane.subsurface(pygame.Rect(930, 697, 57, 43)))            enemies = pygame.sprite.Group()            enemies_explosion = pygame.sprite.Group()            score = 0            shoot_frequency = 0            enemy_frequency = 0            player_explosion_index = 16        # 继续游戏        if is_pause:            is_pause = False    # 游戏结束    if is_game_over:        font = pygame.font.SysFont("微软雅黑", 48)        text = font.render("Score: " + str(score), True, (255, 0, 0))        text_rect = text.get_rect()        text_rect.centerx = screen.get_rect().centerx        text_rect.centery = screen.get_rect().centery + 70        # 显示游戏结束画面        screen.blit(bg_game_over, (0, 0))        # 显示分数        screen.blit(text, text_rect)        font = pygame.font.SysFont("微软雅黑", 40)        text = font.render("Press Left Mouse to Restart", True, (255, 0, 0))        text_rect = text.get_rect()        text_rect.centerx = screen.get_rect().centerx        text_rect.centery = screen.get_rect().centery + 150        screen.blit(text, text_rect)    # 刷新屏幕    pygame.display.update()    # 处理游戏退出    for event in pygame.event.get():        if event.type == pygame.QUIT:            pygame.quit()            exit()    if not is_pause and not is_game_over:        key = pygame.key.get_pressed()        if key[K_w] or key[K_UP]:            player.moveUp()        if key[K_s] or key[K_DOWN]:            player.moveDown()        if key[K_a] or key[K_LEFT]:            player.moveLeft()        if key[K_d] or key[K_RIGHT]:            player.moveRight()

我们来看一下最终实现效果：

作者：程序员野客

公号：Python小二

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