var velocity = Vector2.ZERO
func _physics_process(delta):
if Input. is_action_pressed("ui_right"):
position.x += 4
elif Input. is_action_pressed("ui_left"):
position.x -= 4
elif Input. is_action_pressed("ui_up"):
position.y -= 4
elif Input. is_action_pressed("ui_down"):
position.y += 4
move_and_collide(velocity * position)