void Start()
{
Vector2 canvasSize = transform.parent.GetComponent <RectTransform>().sizeDelta *transform.parent.GetComponent <RectTransform>().localScale.x;
limitSize = new Vector2(canvasSize.x / 2 - protection.GetComponent <CircleCollider2D>().radius, canvasSize.y / 2 - protection.GetComponent <CircleCollider2D>().radius);
}
