python - 如何让敌人在接触方 block 后随机改变方向

Question

糟糕，我想删除它，但它不允许我，抱歉，

Answer 1

它真的想改变方向到非碰撞的方式。 movedirection() 知道它的行进方向，因此可以从选择中删除该方向。

def movedirection(self, x, y):
    next_movement = ( x, y )  # no change
    self.rect.x = self.rect.x + x
    self.rect.y = self.rect.y + y

    # If you collide with a wall, move out based on velocity
    for block in block_list:
        if self.rect.colliderect(block.rect):
            if x > 0:       # Moving right Hit the left side of the wall
                self.rect.right = block.rect.left
                directions = [(-2,0),(0,-2),(0,2)]  # L, D, U
            elif x < 0:       # Moving left Hit the right side of the wall
                self.rect.left = block.rect.right
                directions = [( 2,0),(0,-2),(0,2)]  # R, D, U
            if y > 0:       # Moving down Hit the top side of the wall
                self.rect.bottom = block.rect.top
                directions = [(-2,0),(2,0),(0,-2)]  # L, R, D
            elif y < 0:       # Moving up Hit the bottom side of the wall
                self.rect.top = block.rect.bottom
                directions = [(-2,0),(2,0),(0,2)]   # L, R, U     

            # pick a new random direction that does not re-collide
            next_movement = random.choice( directions )

    # The enemy either continues, or turned
    return next_movement

显然，移动逻辑需要更改以合并返回结果:

def move(self, x, y):
    return self.movedirection( x, y )

def movmethod(self,godirection,changedirection):
    while True:
        godirection = move( godirection )

但是 movmethod() 仍然有一个讨厌的无限循环(它永远不会返回)。我会按照 PyGame Sprite 类通常使用 update() 函数处理这个的方式对运动进行建模。这会处理移动和位图更改等。

def update( self ):
    x, y = self.godirection  # NOTE: now a member variable
    self.rect.x = self.rect.x + x
    self.rect.y = self.rect.y + y

    # If you collide with a wall, move out based on velocity
    for block in block_list:
        if self.rect.colliderect( block.rect ):
            if x > 0:       # Moving right Hit the left side of the wall
                self.rect.right = block.rect.left
                directions = [(-2,0),(0,-2),(0,2)]  # L, D, U
            elif x < 0:       # Moving left Hit the right side of the wall
                self.rect.left = block.rect.right
                directions = [( 2,0),(0,-2),(0,2)]  # R, D, U
            if y > 0:       # Moving down Hit the top side of the wall
                self.rect.bottom = block.rect.top
                directions = [(-2,0),(2,0),(0,-2)]  # L, R, D
            elif y < 0:       # Moving up Hit the bottom side of the wall
                self.rect.top = block.rect.bottom
                directions = [(-2,0),(2,0),(0,2)]   # L, R, U     

            # pick a new random direction that does not re-collide
            self.godirection = random.choice( directions )

在主循环中调用 update()。