PyGame Sprite 随机运动

Question

基本上我试图让我的敌人角色在地图上随机移动。我已经实现了这一点，但是随机运动仅在它们撞到墙上时发生（使其看起来更自然）。有没有更好的方法来做到这一点？还是应该移动我的地图，让角色更频繁地撞墙？

def update(self, walls, player):
    # Check if moving left / right caused a collision
    self.rect.x += self.x_speed
    walls_hit = pygame.sprite.spritecollide(self, walls, False)
    for wall in walls_hit:
        if self.x_speed > 0:
            self.rect.right = wall.rect.left
            tmp = random.randint(0, 1)
            print(tmp)
            if tmp == 0:
                self.x_speed = 0
                self.y_speed = 3
            else:
                self.x_speed = 0
                self.y_speed = -3
        else:
            self.rect.left = wall.rect.right
            tmp = random.randint(0, 1)
            print(tmp)
            if tmp == 0:
                self.x_speed = 0
                self.y_speed = 3
            else:
                self.x_speed = 0
                self.y_speed = -3

    # Check if moving up / down caused a collision
    self.rect.y += self.y_speed
    walls_hit = pygame.sprite.spritecollide(self, walls, False)
    for wall in walls_hit:
        if self.y_speed > 0:
            self.rect.bottom = wall.rect.top
            tmp = random.randint(0, 1)
            print(tmp)
            if tmp == 0:
                self.y_speed = 0
                self.x_speed = 3
            else:
                self.y_speed = 0
                self.x_speed = -3
        else:
            self.rect.top = wall.rect.bottom
            tmp = random.randint(0, 1)
            print(tmp)
            if tmp == 0:
                self.y_speed = 0
                self.x_speed = 3
            else:
                self.y_speed = 0
                self.x_speed = -3

如果有帮助，下面的代码就是我的地图（1 的 = 墙壁，0 的 = 地板）

GRID = [[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
        [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1],
        [1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1],
        [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
        [1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1],
        [1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1],
        [1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1],
        [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
        [1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1],
        [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1],
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]] 

任何帮助将不胜感激！

Answer 1

这真的取决于你想要的随机运动的类型。有很多选择：

• 每“一步”随机移动（可能看起来生涩/不自然）。具体更改代码的一种方法是在速度上有更多变化/逐渐增加（看起来你的角色只能在每个方向移动 +/- 3）

示例：

self.x_speed = 6*random.random()-3
# this will set the x_speed to a float between -3 and 3

self.y_speed += random.random() - .5
# this will increment y_speed by a number in between .5 and -.5
# this is a more gradual speed change and a way to make it look more natural

• 我个人是您当前实现的粉丝，当您撞墙时会改变速度。我认为无论你选择什么随机移动，你的角色应该在你撞墙时改变方向。

• 每 x 步随机移动（这看起来比每步随机移动更自然）

示例：

# within your function, you can see the number of steps
step = 0
if step >= 5: #every 5 steps
    #set random movement of whatever type you want
    self.x_speed = 6*random.random()-3
    self.y_speed = 6*random.random()-3
    step = 0
step += 1

您还可以将step 阈值设为随机数，例如，如果您想每 5-10 步随机改变方向（除了撞墙时），您可以将上面的 if 语句更改为类似这样：

threshold = random.randrange(5,11)
step = 0
if step >= threshold: #every 5 steps
    #set random movement of whatever type you want
    self.x_speed = 6*random.random()-3
    self.y_speed = 6*random.random()-3
    step = 0
    threshold = random.randrange(5,11)
step += 1

祝你的游戏好运！