玩家通过↑↓←→键控制角色zelda(绿色)行动，当玩家按下空格键时，则可以在当前位置放置炸弹。其他角色(dk和batman)则由电脑控制进行随机行动。所有角色被炸弹产生的火焰灼烧时(包括自己放置的炸弹)，都将损失一定生命值；所有角色吃到水果时，均可恢复一定数值的生命值。另外，墙可以阻止炸弹产生的火焰进一步扩散。

当我方角色zelda生命值为0时，游戏失败；当电脑方所有角色生命值为0时，游戏胜利，进入下一关。

逐步实现：

首先，我们来明确一下该游戏包含哪些游戏精灵类：

炸弹类
角色类
墙类
背景类
水果类

墙类和背景类很好定义，只需要可以导入图片，然后把图片绑定到指定位置就行了：

'''墙类'''
class Wall(pygame.sprite.Sprite):
  def __init__(self, imagepath, coordinate, blocksize, **kwargs):
    pygame.sprite.Sprite.__init__(self)
    self.image = pygame.image.load(imagepath)
    self.image = pygame.transform.scale(self.image, (blocksize, blocksize))
    self.rect = self.image.get_rect()
    self.rect.left, self.rect.top = coordinate[0] * blocksize, coordinate[1] * blocksize
    self.coordinate = coordinate
    self.blocksize = blocksize
  '''画到屏幕上'''
  def draw(self, screen):
    screen.blit(self.image, self.rect)
    return True


'''背景类'''
class Background(pygame.sprite.Sprite):
  def __init__(self, imagepath, coordinate, blocksize, **kwargs):
    pygame.sprite.Sprite.__init__(self)
    self.image = pygame.image.load(imagepath)
    self.image = pygame.transform.scale(self.image, (blocksize, blocksize))
    self.rect = self.image.get_rect()
    self.rect.left, self.rect.top = coordinate[0] * blocksize, coordinate[1] * blocksize
    self.coordinate = coordinate
    self.blocksize = blocksize
  '''画到屏幕上'''
  def draw(self, screen):
    screen.blit(self.image, self.rect)
    return True

水果类定义其实也差不多，但是不同的水果可以帮助角色恢复不同数值的生命值：

'''水果类'''
class Fruit(pygame.sprite.Sprite):
  def __init__(self, imagepath, coordinate, blocksize, **kwargs):
    pygame.sprite.Sprite.__init__(self)
    self.kind = imagepath.split('/')[-1].split('.')[0]
    if self.kind == 'banana':
      self.value = 5
    elif self.kind == 'cherry':
      self.value = 10
    else:
      raise ValueError('Unknow fruit <%s>...' % self.kind)
    self.image = pygame.image.load(imagepath)
    self.image = pygame.transform.scale(self.image, (blocksize, blocksize))
    self.rect = self.image.get_rect()
    self.rect.left, self.rect.top = coordinate[0] * blocksize, coordinate[1] * blocksize
    self.coordinate = coordinate
    self.blocksize = blocksize
  '''画到屏幕上'''
  def draw(self, screen):
    screen.blit(self.image, self.rect)
    return True

炸弹类和角色类的定义就稍稍复杂一些了。角色类需要根据玩家或者电脑的指示上下左右移动，同时可以在自己的位置上产生炸弹以及吃水果之后恢复一定数值的生命值：

'''角色类'''
class Hero(pygame.sprite.Sprite):
  def __init__(self, imagepaths, coordinate, blocksize, map_parser, **kwargs):
    pygame.sprite.Sprite.__init__(self)
    self.imagepaths = imagepaths
    self.image = pygame.image.load(imagepaths[-1])
    self.image = pygame.transform.scale(self.image, (blocksize, blocksize))
    self.rect = self.image.get_rect()
    self.rect.left, self.rect.top = coordinate[0] * blocksize, coordinate[1] * blocksize
    self.coordinate = coordinate
    self.blocksize = blocksize
    self.map_parser = map_parser
    self.hero_name = kwargs.get('hero_name')
    # 生命值
    self.health_value = 50
    # 炸弹冷却时间
    self.bomb_cooling_time = 5000
    self.bomb_cooling_count = 0
    # 随机移动冷却时间(仅AI电脑用)
    self.randommove_cooling_time = 100
    self.randommove_cooling_count = 0
  '''角色移动'''
  def move(self, direction):
    self.__updateImage(direction)
    if direction == 'left':
      if self.coordinate[0]-1 < 0 or self.map_parser.getElemByCoordinate([self.coordinate[0]-1, self.coordinate[1]]) in ['w', 'x', 'z']:
        return False
      self.coordinate[0] = self.coordinate[0] - 1
    elif direction == 'right':
      if self.coordinate[0]+1 >= self.map_parser.width or self.map_parser.getElemByCoordinate([self.coordinate[0]+1, self.coordinate[1]]) in ['w', 'x', 'z']:
        return False
      self.coordinate[0] = self.coordinate[0] + 1
    elif direction == 'up':
      if self.coordinate[1]-1 < 0 or self.map_parser.getElemByCoordinate([self.coordinate[0], self.coordinate[1]-1]) in ['w', 'x', 'z']:
        return False
      self.coordinate[1] = self.coordinate[1] - 1
    elif direction == 'down':
      if self.coordinate[1]+1 >= self.map_parser.height or self.map_parser.getElemByCoordinate([self.coordinate[0], self.coordinate[1]+1]) in ['w', 'x', 'z']:
        return False
      self.coordinate[1] = self.coordinate[1] + 1
    else:
      raise ValueError('Unknow direction <%s>...' % direction)
    self.rect.left, self.rect.top = self.coordinate[0] * self.blocksize, self.coordinate[1] * self.blocksize
    return True
  '''随机行动(AI电脑用)'''
  def randomAction(self, dt):
    # 冷却倒计时
    if self.randommove_cooling_count > 0:
      self.randommove_cooling_count -= dt
    action = random.choice(['left', 'left', 'right', 'right', 'up', 'up', 'down', 'down', 'dropbomb'])
    flag = False
    if action in ['left', 'right', 'up', 'down']:
      if self.randommove_cooling_count <= 0:
        flag = True
        self.move(action)
        self.randommove_cooling_count = self.randommove_cooling_time
    elif action in ['dropbomb']:
      if self.bomb_cooling_count <= 0:
        flag = True
        self.bomb_cooling_count = self.bomb_cooling_time
    return action, flag
  '''生成炸弹'''
  def generateBomb(self, imagepath, digitalcolor, explode_imagepath):
    return Bomb(imagepath=imagepath, coordinate=copy.deepcopy(self.coordinate), blocksize=self.blocksize, digitalcolor=digitalcolor, explode_imagepath=explode_imagepath)
  '''画到屏幕上'''
  def draw(self, screen, dt):
    # 冷却倒计时
    if self.bomb_cooling_count > 0:
      self.bomb_cooling_count -= dt
    screen.blit(self.image, self.rect)
    return True
  '''吃水果'''
  def eatFruit(self, fruit_sprite_group):
    eaten_fruit = pygame.sprite.spritecollide(self, fruit_sprite_group, True, None)
    for fruit in eaten_fruit:
      self.health_value += fruit.value
  '''更新角色朝向'''
  def __updateImage(self, direction):
    directions = ['left', 'right', 'up', 'down']
    idx = directions.index(direction)
    self.image = pygame.image.load(self.imagepaths[idx])
    self.image = pygame.transform.scale(self.image, (self.blocksize, self.blocksize))

炸弹类则需要有倒计时提示功能，以及倒计时结束之后在炸弹杀伤范围内产生火焰特效(穷，估计只值1毛钱的特效T_T，大家多担待)：

'''炸弹类'''
class Bomb(pygame.sprite.Sprite):
  def __init__(self, imagepath, coordinate, blocksize, digitalcolor, explode_imagepath, **kwargs):
    pygame.sprite.Sprite.__init__(self)
    self.image = pygame.image.load(imagepath)
    self.image = pygame.transform.scale(self.image, (blocksize, blocksize))
    self.explode_imagepath = explode_imagepath
    self.rect = self.image.get_rect()
    # 像素位置
    self.rect.left, self.rect.top = coordinate[0] * blocksize, coordinate[1] * blocksize
    # 坐标(元素块为单位长度)
    self.coordinate = coordinate
    self.blocksize = blocksize
    # 爆炸倒计时
    self.explode_millisecond = 6000 * 1 - 1
    self.explode_second = int(self.explode_millisecond / 1000)
    self.start_explode = False
    # 爆炸持续时间
    self.exploding_count = 1000 * 1
    # 炸弹伤害能力
    self.harm_value = 1
    # 该炸弹是否还存在
    self.is_being = True
    self.font = pygame.font.SysFont('Consolas', 20)
    self.digitalcolor = digitalcolor
  '''画到屏幕上'''
  def draw(self, screen, dt, map_parser):
    if not self.start_explode:
      # 爆炸倒计时
      self.explode_millisecond -= dt
      self.explode_second = int(self.explode_millisecond / 1000)
      if self.explode_millisecond < 0:
        self.start_explode = True
      screen.blit(self.image, self.rect)
      text = self.font.render(str(self.explode_second), True, self.digitalcolor)
      rect = text.get_rect(center=(self.rect.centerx-5, self.rect.centery+5))
      screen.blit(text, rect)
      return False
    else:
      # 爆炸持续倒计时
      self.exploding_count -= dt
      if self.exploding_count > 0:
        return self.__explode(screen, map_parser)
      else:
        self.is_being = False
        return False
  '''爆炸效果'''
  def __explode(self, screen, map_parser):
    explode_area = self.__calcExplodeArea(map_parser.instances_list)
    for each in explode_area:
      image = pygame.image.load(self.explode_imagepath)
      image = pygame.transform.scale(image, (self.blocksize, self.blocksize))
      rect = image.get_rect()
      rect.left, rect.top = each[0] * self.blocksize, each[1] * self.blocksize
      screen.blit(image, rect)
    return explode_area
  '''计算爆炸区域'''
  def __calcExplodeArea(self, instances_list):
    explode_area = []
    # 区域计算规则为墙可以阻止爆炸扩散, 且爆炸范围仅在游戏地图范围内
    for ymin in range(self.coordinate[1], self.coordinate[1]-5, -1):
      if ymin < 0 or instances_list[ymin][self.coordinate[0]] in ['w', 'x', 'z']:
        break
      explode_area.append([self.coordinate[0], ymin])
    for ymax in range(self.coordinate[1]+1, self.coordinate[1]+5):
      if ymax >= len(instances_list) or instances_list[ymax][self.coordinate[0]] in ['w', 'x', 'z']:
        break
      explode_area.append([self.coordinate[0], ymax])
    for xmin in range(self.coordinate[0], self.coordinate[0]-5, -1):
      if xmin < 0 or instances_list[self.coordinate[1]][xmin] in ['w', 'x', 'z']:
        break
      explode_area.append([xmin, self.coordinate[1]])
    for xmax in range(self.coordinate[0]+1, self.coordinate[0]+5):
      if xmax >= len(instances_list[0]) or instances_list[self.coordinate[1]][xmax] in ['w', 'x', 'z']:
        break
      explode_area.append([xmax, self.coordinate[1]])
    return explode_area

因为炸弹类和角色类每帧都要绑定到游戏屏幕上，所以一些倒计时操作就合并地写到draw函数里了，当然最好是重

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