extends Node2D


export var target = Vector2 (0, 0)
export var pos = Vector2 (0, 0)
export var max_speed = 50
export var spring_k = 10
export var spring_b = 0.5

var velocity = Vector2(0, 0)

const pos_error_eps = 0.01

signal position_updated

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

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	if (target - pos).length_squared() > pos_error_eps * pos_error_eps:
		var acceleration = spring_k * (target - pos) - spring_b * velocity
		velocity = velocity + acceleration * delta
		pos = pos + velocity * delta
		
		emit_signal("position_updated", pos)