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|
module Repr = Layer.CanvaPrinter
type t = Point.t
type 'a repr =
{ back: ('a Repr.t -> 'a Repr.t)
; path: ('a Repr.t)
; last_point : Point.t option
}
let create_path
: unit -> 'a repr
= fun () ->
{ back = Repr.close
; path = Repr.create ()
; last_point = None
}
(* Start a new path. *)
let start
: Point.t -> 'a repr -> 'a repr
= fun t {back; path; _} ->
let path = Repr.move_to (Point.get_coord t) path in
let line' = Repr.line_to (Point.get_coord' t) in
{ back = (fun p -> back @@ line' p)
; path
; last_point = Some t
}
let line_to
: Point.t -> Point.t -> 'a repr -> 'a repr
= fun _ t {back; path; _} ->
let line' = Repr.line_to (Point.get_coord' t) in
{ back = (fun t -> back @@ line' t)
; path = Repr.line_to (Point.get_coord t) path
; last_point = Some t
}
let quadratic_to
: Point.t -> Gg.v2 -> Gg.v2 -> Point.t -> 'a repr -> 'a repr
= fun p0 ctrl0 ctrl1 p1 t ->
let ctrl0' = Point.copy p1 ctrl0
and ctrl1' = Point.copy p1 ctrl1 in
let line' path =
Repr.quadratic_to
(Point.get_coord' @@ ctrl1')
(Point.get_coord' ctrl0')
(Point.get_coord' p0) path in
let path = Repr.quadratic_to
(Point.get_coord ctrl0')
(Point.get_coord ctrl1')
(Point.get_coord p1)
t.path in
{ back = (fun p -> t.back @@ line' p)
; path
; last_point = Some p1
}
let stop
: 'a repr -> 'a repr
= fun {back; path; last_point} ->
let path =
match last_point with
| Some point -> Repr.line_to (Point.get_coord' point) path
| None -> path in
{ back = (fun x -> x)
; path = back path
; last_point = None }
let get
: 'a repr -> 'a Repr.t
= fun {back; path; _} ->
back path
|
