public override void OnExit(BaseTower entity)
 {
     entity.Update();
     entity.ZIndex = 3;
     entity.PlayerCollision.Disabled = false;
     if (!entity.CanPlaceTower())
     {
         entity.ResetToDragStart();
     }
 }
            public override void Update(BaseTower entity, float delta)
            {
                var mousePos = entity.GetGlobalMousePosition();

                entity.Update();
                entity.DragTo(mousePos);
                entity.ZIndex = 4;
                var canPlace = entity.CanPlaceTower();

                entity.AttackColour = canPlace ? GameInfo.ValidColour : GameInfo.InvalidColour;

                entity.DragStart = canPlace ? entity.Position : entity.DragStart;
            }