__init__.py 文件源码

def tick(self, game_loop):
        """
        Moving elevator up and down OR left and right.
        """
        dt = game_loop.dt

        self.move(self.vx * dt, self.vy * dt)
        if self.direction == "x":
            if self.rect.x < self.min_pos:
                self.vx = abs(self.vx)
                self.move(self.min_pos, None, absolute=True)
            elif self.rect.x > self.max_pos:
                self.vx = -abs(self.vx)
                self.move(self.max_pos, None, absolute=True)
        else:
            if self.rect.y < self.min_pos:
                self.vy = abs(self.vy)
                self.move(None, self.min_pos, absolute=True)
            elif self.rect.y > self.max_pos:
                self.vy = -abs(self.vy)
                self.move(None, self.max_pos, absolute=True)