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|
open StdLabels
open Brr
type mode =
| Edit
| Selection of Selection.t
| Out
(** Events *)
type render_event =
[
`Rendering of Layer.Paths.printer
]
type worker_event = Worker_messages.from_worker
(*
The state cant hold functionnal values, and thus cannot be used to store
elements like timer
*)
type state =
{ mode : mode
; paths : Outline.t list
; current : Path.Path_Builder.t
; width : float
; angle : float
; rendering : Layer.Paths.printer
; mouse_down_position : Gg.v2
}
module type Handler = sig
type t
val apply: t -> state -> state
end
type t = E : 'a * (module Handler with type t = 'a) -> t
type events =
[ `Export
| render_event
| worker_event
| `Point of float * (float * float)
| `Width of float
| `Angle of float
| `Generic of t
]
let post
: Brr_webworkers.Worker.t -> Worker_messages.to_worker -> unit
= Brr_webworkers.Worker.post
let insert_or_replace state ((x, y) as p) stamp path =
let width = state.width
and angle = state.angle in
let point = Path.Point.create ~x ~y ~angle ~width ~stamp in
match Path.Path_Builder.peek path with
| None ->
Path.Path_Builder.add_point
point
path
| Some p1 ->
let open Gg.V2 in
let p1' = Path.Point.get_coord p1 in
let dist = (norm (p1' - (of_tuple p))) in
if dist < 5. then (
path
) else (
Path.Path_Builder.add_point
point
path
)
(** Select the given segment, and modify angle and width accordingly *)
let select_segment _ (_, selected, p0, p1) state dist =
let point' = Path.Point.mix dist (Path.Point.get_coord p0) p0 p1 in
let angle = (Float.round @@ 10. *. Path.Point.get_angle point') /. 10.
and width = (Float.round @@ 10. *. Path.Point.get_width point') /. 10. in
let id = Selection.select_path selected in
{ state with
mode = (Selection id)
; angle
; width }
(** Tick event
Tick only occurs when drawing a new path
*)
let tick (delay, point) state =
match state.mode with
| Edit ->
(* Add the point in the list *)
let current = insert_or_replace
state
point
delay
state.current in
{ state with current }
| _ -> state
let update_property worker state value f = function
| None -> state
| Some (Selection.Path outline) ->
(* Change width for the whole path *)
let outline = { outline with
Outline.path = Path.Fixed.map outline.Outline.path (fun p ->
f p value)
} in
post worker (`Back outline);
state
| Some (Point (outline, point)) ->
let path = Path.Fixed.map
outline.path
(fun pt ->
match Path.Point.id pt = Path.Point.id point with
| false -> pt
| true -> f pt value)
in
let outline = {outline with path} in
post worker (`Back outline);
state
let width worker width state =
match state.mode with
| Selection t ->
let state = { state with width } in
Selection.find_selection t state.paths
|> update_property worker state width Path.Point.set_width
| _ -> { state with width }
let angle worker angle state =
match state.mode with
| Selection t ->
let state = { state with angle } in
Selection.find_selection t state.paths
|> update_property worker state angle Path.Point.set_angle
| _ -> { state with angle }
let do_action
: Brr_webworkers.Worker.t -> (events, state) Application.t
= fun worker event state ->
match event, state.mode with
| `Generic (E (t, (module Handler))), _ ->
Handler.apply t state
| `Point (delay, point), _ ->
tick (delay, point) state
| `Export, _ ->
let my_host = Uri.host @@ Window.location @@ G.window in
if (Hashtbl.hash my_host) = Blog.Hash_host.expected_host then (
(* Convert the path into an sVG element *)
let svg = Layer.Svg.svg
~at:Brr.At.[
v (Jstr.v "xmlns") (Jstr.v "http://www.w3.org/2000/svg")
; v (Jstr.v "xmlns:xlink") (Jstr.v "http://www.w3.org/1999/xlink") ]
(List.map state.paths
~f:(fun path ->
Layer.Paths.to_svg
~color:Blog.Nord.nord0
(module Path.Fixed)
Outline.(path.path, path.back)
state.rendering
)) in
let content = El.prop Elements.Prop.outerHTML svg in
Elements.Transfert.send
~mime_type:(Jstr.v "image/svg+xml")
~filename:(Jstr.v "out.svg")
content);
state
| `Angle value , _ ->
angle worker value state
| `Width value, _ ->
width worker value state
| `Rendering rendering, _ ->
{ state with rendering}
| `Other t, _ ->
Console.(log [t]);
state
| `Complete newPath, _ ->
let paths = List.map
state.paths
~f:(fun line ->
match Outline.(newPath.id = line.id) with
| true -> newPath
| false -> line) in
{ state with paths }
let init =
{ paths = []
; current = Path.Path_Builder.empty
; mode = Out
; angle = 30.
; width = 10.
; rendering = `Fill
; mouse_down_position = Gg.V2.ox
}
|
