type t

val empty : t

val (+): t -> Gg.v2 -> t

val get_coord : t -> Gg.v2

val create: angle:float -> width:float -> x:float -> y:float -> t

val copy : t -> Gg.v2 -> t

val set_angle : t -> float -> t

val set_width: t -> float -> t

val get_coord'
  : t -> Gg.v2