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module Path = Script_path
module Make (Layer : Repr.PRINTER) = struct
type point = Path.Point.t
type t = { path : Layer.t }
type repr = Layer.t
let create_path : 'b -> t = fun _ -> { path = Layer.create () }
let start : point -> point -> t -> t =
fun p1 p2 { path } ->
let path =
Layer.move_to (Path.Point.get_coord p1) path
|> Layer.line_to (Path.Point.get_coord p2)
in
{ path }
let line_to : point * point -> point * point -> t -> t =
fun (_, p1) (_, p1') { path } ->
let path = Layer.move_to (Path.Point.get_coord p1) path in
let path = Layer.line_to (Path.Point.get_coord p1') path in
{ path }
let quadratic_to :
point * Gg.v2 * Gg.v2 * point -> point * Gg.v2 * Gg.v2 * point -> t -> t =
fun (p0, ctrl0, ctrl1, p1) (p0', ctrl0', ctrl1', p1') { path } ->
let bezier =
{ Shapes.Bezier.p0 = Path.Point.get_coord p0
; ctrl0
; ctrl1
; p1 = Path.Point.get_coord p1
}
and bezier' =
{ Shapes.Bezier.p0 = Path.Point.get_coord p0'
; ctrl0 = ctrl0'
; ctrl1 = 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) *. 30. in
let path = ref path in
for i = 0 to Int.of_float delay do
let ratio = Float.of_int i /. delay in
let bezier, _ = Shapes.Bezier.slice ratio bezier
and bezier', _ = Shapes.Bezier.slice ratio bezier' in
let point = Path.Point.mix ratio bezier.Shapes.Bezier.p1 p0 p1
and point' = Path.Point.mix ratio bezier'.Shapes.Bezier.p1 p0' p1' in
path := Layer.move_to (Path.Point.get_coord point) !path;
path := Layer.line_to (Path.Point.get_coord point') !path
done;
{ path = !path }
let stop : t -> t = fun path -> path
let get : t -> Layer.t = fun { path; _ } -> path
end
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