1 # 敌人类
 2 class Mob(pg.sprite.Sprite):
 3     def __init__(self, game):
 4         pg.sprite.Sprite.__init__(self)
 5         self.game = game
 6         self.current_frame = 0
 7         self.last_update = 0
 8         self.image_up = self.game.spritesheet.get_image("flyMan_fly.png")
 9         self.image_down = self.game.spritesheet.get_image("flyMan_jump.png")
10         self.image = self.image_up
11         self.rect = self.image.get_rect()
12         self.rect.centerx = random.choice([-100, WIDTH + 100])
13         self.vx = random.randrange(1, 4)
14         if self.rect.centerx > WIDTH:
15             self.vx *= -1
16         self.rect.y = random.randrange(HEIGHT / 2)
17         self.vy = 0
18         self.dy = 0.5
19
20     def update(self):
21         self.rect.x += self.vx
22         self.vy += self.dy
23         # 敌人上下移动
24         if abs(self.vy) > 3:
25             self.dy *= -1
26         center = self.rect.center
27         if self.dy < 0:
28             self.image = self.image_up
29         else:
30             self.image = self.image_down
31         self.rect = self.image.get_rect()
32         self.rect.center = center
33         self.rect.y += self.vy
34         # 超出边界自动清除资源
35         if self.rect.left > WIDTH + 100 or self.rect.right < -100:
36             self.kill()

 1     def update(self):
 2         self.all_sprites.update()
 3
 4         # 每隔一定时间，随机加入敌人
 5         now = pg.time.get_ticks()
 6         if now - self.mob_timer > MOB_FREQ + random.choice([-1000, -500, 0, 500, 1000]):
 7             self.mob_timer = now
 8             mob = Mob(self)
 9             # 指定分层
10             self.all_sprites.add(mob, layer=MOB_LAYER)
11             self.mobs.add(mob)
12
13         # 与敌人的碰撞检测
14         mob_hits = pg.sprite.spritecollide(self.player, self.mobs, False)
15         if mob_hits:
16             self.playing = False
17
18        ...
19
20         if self.player.rect.top < HEIGHT / 4:
21             self.player.pos.y += max(abs(self.player.vel.y), 2)
22             # 屏幕滚动时，敌人也要相应的滚动
23             for mob in self.mobs:
24                 mob.rect.top += max(abs(self.player.vel.y), 2)
25                 if mob.rect.top > HEIGHT:
26                     mob.kill()
27            ...

 1     def new(self):
 2         self.score = 0
 3         # 这里换成LayeredUpdates为了体现"分层"效果
 4         self.all_sprites = pg.sprite.LayeredUpdates()
 5         self.platforms = pg.sprite.Group()
 6         self.powerups = pg.sprite.Group()
 7         # 敌人的分组
 8         self.mobs = pg.sprite.Group()
 9         self.player = Player(self)
10         # 指定分层
11         self.all_sprites.add(self.player, layer=PLAYER_LAYER)
12         self.mob_timer = 0

1 # layer
2 PLAYER_LAYER = 4
3 MOB_LAYER = 3
4 PLATFORM_LAYER = 1
5 POWERUP_LAYER = 2