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|
module Point = Path.Point
module Make(Repr: Repr.PRINTER) = struct
type t = Point.t
type repr =
{ path: Repr.t
; close : Repr.t -> Repr.t
}
let create_path
: (Repr.t -> Repr.t) -> repr
= fun f ->
{ close = f
; path = Repr.create ()
}
(* Start a new path. *)
let start'
: Gg.v2 -> Gg.v2 -> repr -> repr
= fun p1 _ {close ; path } ->
let path = Repr.move_to p1 path in
{ close
; path
}
let start
: Path.Point.t -> repr -> repr
= fun pt t ->
let p = (Point.get_coord pt) in
start' p p t
let line_to'
: (Gg.v2 * Gg.v2) -> (Gg.v2 * Gg.v2) -> repr -> repr
= fun (p0, p1) (p0', p1') t ->
let path =
Repr.move_to p1 t.path
|> Repr.line_to p1'
|> Repr.line_to p0'
|> Repr.line_to p0
|> Repr.line_to p1
|> Repr.close in
let path = t.close path in
{ t with path}
let line_to
: Point.t -> Point.t -> repr -> repr
= fun p0 p1 t ->
line_to'
( Point.get_coord p0
, Point.get_coord p1 )
( Point.get_coord' p0
, Point.get_coord' p1 )
t
let quadratic_to'
: (Gg.v2 * Gg.v2 * Gg.v2 * Gg.v2) -> (Gg.v2 * Gg.v2 * Gg.v2 * Gg.v2) -> repr -> repr
= fun (p0, ctrl0, ctrl1, p1) (p0', ctrl0', ctrl1', p1') t ->
let path =
Repr.move_to p1 t.path
|> Repr.line_to p1'
(* Backward *)
|> Repr.quadratic_to
ctrl1'
ctrl0'
p0'
|> Repr.line_to p0
(* Forward *)
|> Repr.quadratic_to
ctrl0
ctrl1
p1
|> Repr.close
|> t.close in
{ t with path }
let quadratic_to
: (t * Gg.v2 * Gg.v2 * t) -> repr -> repr
= fun (p0, ctrl0, ctrl1, p1) t ->
let ctrl0' = Point.get_coord' @@ Point.copy p0 ctrl0
and ctrl1' = Point.get_coord' @@ Point.copy p1 ctrl1 in
quadratic_to'
(Point.get_coord p0, ctrl0, ctrl1, Point.get_coord p1)
(Point.get_coord' p0, ctrl0', ctrl1', Point.get_coord' p1)
t
let stop
: repr -> repr
= fun t ->
t
let get
: repr -> Repr.t
= fun t ->
t.path
end
|
