public void Move()
    {
        if (path.Count > 0)
        {
            Tile    t      = path.Peek();
            Vector3 target = t.transform.position;

            //calcul positiion unite au dessus de la case
            target.y += halfHeight + t.GetComponent <Collider> ().bounds.extents.y;

            if (Vector3.Distance(transform.position, target) >= 0.05f)
            {
                CalculateHeading(target);
                SetHorizontalVelocity();

                transform.forward   = heading;
                transform.position += velocity * Time.deltaTime;
            }
            else
            {
                transform.position = target;
                path.Pop();
            }
        }
        else
        {
            RemoveSelectableTiles();
            moving = false;


            GestionTour.EndTurn();
        }
    }
    protected void Init()
    {
        tiles = GameObject.FindGameObjectsWithTag("Tile");

        halfHeight = GetComponent <Collider> ().bounds.extents.y;

        GestionTour.AddUnit(this);
    }