val reset : t -> unit
val transform : t -> Matrix.t -> unit
val translate : t -> x:float -> y:float -> unit
val rotate : t -> angle:float -> unit
val skew_x : t -> angle:float -> unit
val skew_y : t -> angle:float -> unit
val scale : t -> x:float -> y:float -> unit
val current_transform : t -> Matrix.t
val deg_to_rad : float -> float
val rad_to_deg : float -> float
