1 # PowerUp 加速器
 2 class PowerUp(pg.sprite.Sprite):
 3     def __init__(self, game, plat):
 4         pg.sprite.Sprite.__init__(self)
 5         self.game = game
 6         self.plat = plat
 7         self.current_frame = 0
 8         self.last_update = 0
 9         self.images = [self.game.spritesheet.get_image("powerup_empty.png"),
10                        self.game.spritesheet.get_image("powerup_jetpack.png")]
11         self.image = random.choice(self.images)
12         self.rect = self.image.get_rect()
13         # 停在档板的中间
14         self.rect.centerx = self.plat.rect.centerx
15         self.rect.bottom = self.plat.rect.top - 5
16
17     def update(self):
18         self.animate()
19         self.rect.bottom = self.plat.rect.top - 5
20         if not self.game.platforms.has(self.plat):
21             self.kill()
22
23     def animate(self):
24         now = pg.time.get_ticks()
25         if now - self.last_update > 200:
26             self.last_update = now
27             self.current_frame += 1
28             self.image = self.images[self.current_frame % len(self.images)]
29             self.rect = self.image.get_rect()
30             self.rect.bottom = self.plat.rect.top - 5
31             self.rect.centerx = self.plat.rect.centerx

 1 class Platform(pg.sprite.Sprite):
 2     def __init__(self, game, x, y):
 3         pg.sprite.Sprite.__init__(self)
 4         self.game = game
 5         images = [self.game.spritesheet.get_image("ground_grass_broken.png"),
 6                   self.game.spritesheet.get_image("ground_grass_small_broken.png")]
 7         self.image = random.choice(images)
 8         self.rect = self.image.get_rect()
 9         self.rect.x = x
10         self.rect.y = y
11         # 随机出现power-up加速器
12         if random.randrange(100) < BOOST_POWER_PERCENT:
13             power = PowerUp(self.game, self)
14             self.game.all_sprites.add(power)
15             self.game.powerups.add(power)

 1     def update(self):
 2         self.all_sprites.update()
 3         ...
 4         if self.player.rect.top < HEIGHT / 4:
 5             self.player.pos.y += max(abs(self.player.vel.y), 2)
 6             for plat in self.platforms:
 7                 plat.rect.top += max(abs(self.player.vel.y), 2)
 8                 if plat.rect.top > HEIGHT:
 9                     plat.kill()
10                     self.score += 10
11
12         # 检测power up碰撞
13         pow_hits = pg.sprite.spritecollide(self.player, self.powerups, True)
14         for _ in pow_hits:
15             self.boost_sound.play()
16             self.player.vel.y = -BOOST_POWER
17             self.player.jumping = False
18
19         ...