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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
|
