Godot 精灵移动不超出边界

sprite_move.gd

extends Sprite

export var speed = 400

# Called when the node enters the scene tree for the first time.
func _ready():
	pass


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	var vec = Vector2.ZERO
	if Input.is_action_pressed("move_right"):
		vec.x += 1
	if Input.is_action_pressed("move_left"):
		vec.x -= 1
	if Input.is_action_pressed("move_up"):
		vec.y -= 1
	if Input.is_action_pressed("move_down"):
		vec.y += 1
		
	vec = vec.normalized() * speed # 单位向量乘以速度 = 单位时间应该移动的向量距离
	self.position += vec * delta # 乘以时间表示移动的距离
	# 避免超出边界
	var screenSize = get_viewport_rect().size
	self.position.x = clamp(self.position.x, 0, screenSize.x)
	self.position.y = clamp(self.position.y, 0 , screenSize.y)