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|
module Make(Repr: Repr.PRINTER) = struct
type t = Path.Point.t
type repr =
{ path: (Repr.t)
}
let create_path
: 'b -> repr
= fun _ ->
{ path = Repr.create ()
}
(* Start a new path. *)
let start
: Path.Point.t -> repr -> repr
= fun t {path} ->
let path = Repr.move_to (Path.Point.get_coord t) path in
let path = Repr.line_to (Path.Point.get_coord' t) path in
{ path
}
let line_to
: Path.Point.t -> Path.Point.t -> repr -> repr
= fun _ t {path} ->
let path = Repr.move_to (Path.Point.get_coord t) path in
let path = Repr.line_to (Path.Point.get_coord' t) path in
{ path
}
let quadratic_to
: Path.Point.t -> Gg.v2 -> Gg.v2 -> Path.Point.t -> repr -> repr
= fun p0 ctrl0 ctrl1 p1 { path } ->
let path = ref path in
let bezier =
{ Shapes.Bezier.p0 = Path.Point.get_coord p0
; ctrl0
; ctrl1
; p1 = Path.Point.get_coord p1
} in
(* Mark each point on the bezier curve. The first point is the most
recent point *)
let delay =
((Path.Point.get_stamp p0) -. (Path.Point.get_stamp p1))
*. 20.
in
for i = 0 to ((Int.of_float delay) -1) do
let ratio = (Float.of_int i) /. delay in
let bezier', _ = Shapes.Bezier.slice ratio bezier in
let point = Path.Point.mix ratio bezier'.Shapes.Bezier.p1 p0 p1 in
path := Repr.move_to (Path.Point.get_coord point) !path;
path := Repr.line_to (Path.Point.get_coord' point) !path;
done;
{ path = !path }
let stop
: repr -> repr
= fun path -> path
let get
: repr -> Repr.t
= fun {path; _} ->
path
end
|
