method get_bounds : float * float * float * floatmethod set_bounds : left:float -> top:float -> right:float -> bottom:float -> unitmethod convert_to_item_space : base_item -> x:float -> y:float -> float * floatmethod convert_from_item_space : base_item -> x:float -> y:float -> float * floatmethod convert_to_pixels : x:float -> y:float -> float * floatmethod convert_from_pixels : x:float -> y:float -> float * floatmethod set_scale : float -> unitmethod get_item_at : ?is_pointer_event:bool -> x:float -> y:float -> unit -> base_item option