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我是 Cocos2d 的新手，我正在研究如何使用 pyglet ImageGrid 和 Animation 方法来创建精灵动画。我已经成功地将正确的切片分配给我的僵尸精灵对象 - 在init()函数中 - 取决于它面向的方向（在创建时随机分配）。僵尸精灵然后在他们走向边界时通过循环。一旦他们到达边界然后改变方向，动画就不会更新为面向相同的方向，所以我最终会得到一堆月球漫步僵尸……这并不是我想要的效果。如何在动画改变方向时更新它们？

"""

def __init__(self, x, y):
    super(Zombie, self).__init__()
    duration = 0.1
    self.x = x
    self.y = y
    self.speed = 45
    directions = [-1, 1]
    i = randint(0, 1)
    for index, direction in enumerate(directions):
        if i == index:
            self.direction = direction
    img = load('sprites/zombiewalk.png')
    img_grid = ImageGrid(img, 1, 12, item_width=32, item_height=48)

    if self.direction == -1:
        animation = Animation.from_image_sequence(img_grid[3:6], duration)
        sprite = cocos.sprite.Sprite(animation)
        self.add(sprite)
    elif self.direction == 1:
        animation = Animation.from_image_sequence(img_grid[6:9], duration)
        sprite = cocos.sprite.Sprite(animation)
        self.add(sprite)

def update(self, elapsed):
    new_x = self.position[0] + self.speed * self.direction * elapsed
    self.position = (new_x, self.y)
    if self.position[0] < 0 or self.position[0] > 800:
        self.direction *= -1

"""

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