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viewer_js.ml
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viewer_js.ml
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(* Graph viewer
* Copyright (C) 2010 Jérôme Vouillon
* Laboratoire PPS - CNRS Université Paris Diderot
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
open Js_of_ocaml
open Js_of_ocaml_lwt
type rect =
{ x : int
; y : int
; width : int
; height : int
}
module Html = Dom_html
let create_canvas w h =
let c = Html.createCanvas Html.document in
c##.width := w;
c##.height := h;
c
module Common = Viewer_common.F (struct
type font = Js.js_string Js.t
type color = Js.js_string Js.t
type text = Js.js_string Js.t
let white = Js.string "white"
type ctx = Html.canvasRenderingContext2D Js.t
let save ctx = ctx##save
let restore ctx = ctx##restore
let scale ctx ~sx ~sy = ctx##scale (Js.float sx) (Js.float sy)
let translate ctx ~tx ~ty = ctx##translate (Js.float tx) (Js.float ty)
let begin_path ctx = ctx##beginPath
let close_path ctx = ctx##closePath
let move_to ctx ~x ~y = ctx##moveTo (Js.float x) (Js.float y)
let line_to ctx ~x ~y = ctx##lineTo (Js.float x) (Js.float y)
let curve_to ctx ~x1 ~y1 ~x2 ~y2 ~x3 ~y3 =
ctx##bezierCurveTo
(Js.float x1)
(Js.float y1)
(Js.float x2)
(Js.float y2)
(Js.float x3)
(Js.float y3)
let arc ctx ~xc ~yc ~radius ~angle1 ~angle2 =
ctx##arc
(Js.float xc)
(Js.float yc)
(Js.float radius)
(Js.float angle1)
(Js.float angle2)
Js._true
let rectangle ctx ~x ~y ~width ~height =
ctx##rect (Js.float x) (Js.float y) (Js.float width) (Js.float height)
let fill ctx c =
ctx##.fillStyle := c;
ctx##fill
let stroke ctx c =
ctx##.strokeStyle := c;
ctx##stroke
let clip ctx = ctx##clip
let draw_text (ctx : ctx) x y txt font fill_color stroke_color =
ctx##.font := font;
ctx##.textAlign := Js.string "center";
ctx##.textBaseline := Js.string "middle";
(match fill_color with
| Some c ->
ctx##.fillStyle := c;
ctx##fillText txt (Js.float x) (Js.float y)
| None -> ());
match stroke_color with
| Some c ->
ctx##.strokeStyle := c;
ctx##strokeText txt (Js.float x) (Js.float y)
| None -> ()
type window = Html.canvasElement Js.t
type drawable = window * ctx
type pixmap = drawable
let get_drawable w =
let ctx = w##getContext Html._2d_ in
ctx##.lineWidth := Js.float 2.;
w, ctx
let make_pixmap _ width height =
let c = Html.createCanvas Html.document in
c##.width := width;
c##.height := height;
get_drawable c
let drawable_of_pixmap p = p
let get_context (_p, c) = c
let put_pixmap
~dst:((_p, c) : drawable)
~x
~y
~xsrc
~ysrc
~width
~height
((p, _) : pixmap) =
c##drawImage_fullFromCanvas
p
(Js.float (float xsrc))
(Js.float (float ysrc))
(Js.float (float width))
(Js.float (float height))
(Js.float (float x))
(Js.float (float y))
(Js.float (float width))
(Js.float (float height))
(****)
type rectangle = rect =
{ x : int
; y : int
; width : int
; height : int
}
let compute_extents _ = assert false
end)
open Common
let redraw st s h v (canvas : Html.canvasElement Js.t) =
let width = canvas##.width in
let height = canvas##.height in
(*Firebug.console##time (Js.string "draw");*)
redraw st s h v canvas { x = 0; y = 0; width; height } 0 0 width height
(*
;Firebug.console##timeEnd (Js.string "draw")
;Firebug.console##log_2 (Js.string "draw", Js.date##now())
*)
let json : < parse : Js.js_string Js.t -> 'a > Js.t = Js.Unsafe.pure_js_expr "JSON"
let ( >>= ) = Lwt.bind
let http_get url =
XmlHttpRequest.get url
>>= fun { XmlHttpRequest.code = cod; content = msg; _ } ->
if cod = 0 || cod = 200 then Lwt.return msg else fst (Lwt.wait ())
let getfile f = try Lwt.return (Sys_js.read_file ~name:f) with Not_found -> http_get f
class adjustment
?(value = 0.)
?(lower = 0.)
?(upper = 100.)
?(step_incr = 1.)
?(page_incr = 10.)
?(page_size = 10.)
() =
object
val mutable _value = value
method value = _value
val mutable _lower = lower
method lower = _lower
val mutable _upper = upper
method upper = _upper
val mutable _step_incr = step_incr
method step_increment = _step_incr
val mutable _page_incr = page_incr
method page_increment = _page_incr
val mutable _page_size = page_size
method page_size = _page_size
method set_value v = _value <- v
method set_bounds ?lower ?upper ?step_incr ?page_incr ?page_size () =
(match lower with
| Some v -> _lower <- v
| None -> ());
(match upper with
| Some v -> _upper <- v
| None -> ());
(match step_incr with
| Some v -> _step_incr <- v
| None -> ());
(match page_incr with
| Some v -> _page_incr <- v
| None -> ());
match page_size with
| Some v -> _page_size <- v
| None -> ()
end
let handle_drag element f =
let mx = ref 0 in
let my = ref 0 in
element##.onmousedown :=
Html.handler (fun ev ->
mx := ev##.clientX;
my := ev##.clientY;
element##.style##.cursor := Js.string "move";
let c1 =
Html.addEventListener
Html.document
Html.Event.mousemove
(Html.handler (fun ev ->
let x = ev##.clientX and y = ev##.clientY in
let x' = !mx and y' = !my in
mx := x;
my := y;
f (x - x') (y - y');
Js._true))
Js._true
in
let c2 = ref Js.null in
c2 :=
Js.some
(Html.addEventListener
Html.document
Html.Event.mouseup
(Html.handler (fun _ ->
Html.removeEventListener c1;
Js.Opt.iter !c2 Html.removeEventListener;
element##.style##.cursor := Js.string "";
Js._true))
Js._true);
(* We do not want to disable the default action on mouse down
(here, keyboard focus)
in this example. *)
Js._true)
let start () =
let doc = Html.document in
let page = doc##.documentElement in
page##.style##.overflow := Js.string "hidden";
doc##.body##.style##.overflow := Js.string "hidden";
doc##.body##.style##.margin := Js.string "0px";
let started = ref false in
let p = Html.createP doc in
p##.innerHTML := Js.string "Loading graph...";
p##.style##.display := Js.string "none";
Dom.appendChild doc##.body p;
ignore
(Lwt_js.sleep 0.5
>>= fun () ->
if not !started then p##.style##.display := Js.string "inline";
Lwt.return ());
(*
Firebug.console##time(Js.string "loading");
*)
getfile "scene.json"
>>= fun s ->
(*
Firebug.console##timeEnd(Js.string "loading");
Firebug.console##time(Js.string "parsing");
*)
let (x1, y1, x2, y2), bboxes, scene = json##parse (Js.string s) in
(*
Firebug.console##timeEnd(Js.string "parsing");
Firebug.console##time(Js.string "init");
*)
started := true;
Dom.removeChild doc##.body p;
let st =
{ bboxes
; scene
; zoom_factor = 1. /. 20.
; st_x = x1
; st_y = y1
; st_width = x2 -. x1
; st_height = y2 -. y1
; st_pixmap = Common.make_pixmap ()
}
in
let canvas = create_canvas page##.clientWidth page##.clientHeight in
Dom.appendChild doc##.body canvas;
let allocation () =
{ x = 0; y = 0; width = canvas##.width; height = canvas##.height }
in
let hadj = new adjustment () in
let vadj = new adjustment () in
let sadj = new adjustment ~upper:20. ~step_incr:1. ~page_incr:0. ~page_size:0. () in
let zoom_steps = 8. in
(* Number of steps to get a factor of 2 *)
let set_zoom_factor f =
let count = ceil (log f /. log 2. *. zoom_steps) in
let f = 2. ** (count /. zoom_steps) in
sadj#set_bounds ~upper:count ();
st.zoom_factor <- f
in
let get_scale () = (2. ** (sadj#value /. zoom_steps)) /. st.zoom_factor in
let redraw_queued = ref false in
let update_view _force =
(*
Firebug.console##log_2(Js.string "update", Js.date##now());
*)
let a = allocation () in
let scale = get_scale () in
let aw = ceil (float a.width /. scale) in
let ah = ceil (float a.height /. scale) in
hadj#set_bounds
~step_incr:(aw /. 20.)
~page_incr:(aw /. 2.)
~page_size:(min aw st.st_width)
~upper:st.st_width
();
let mv = st.st_width -. hadj#page_size in
if hadj#value < 0. then hadj#set_value 0.;
if hadj#value > mv then hadj#set_value mv;
vadj#set_bounds
~step_incr:(ah /. 20.)
~page_incr:(ah /. 2.)
~page_size:(min ah st.st_height)
~upper:st.st_height
();
let mv = st.st_height -. vadj#page_size in
if vadj#value < 0. then vadj#set_value 0.;
if vadj#value > mv then vadj#set_value mv;
if not !redraw_queued
then (
redraw_queued := true;
let (_ : Html.animation_frame_request_id) =
Html.window##requestAnimationFrame
(Js.wrap_callback (fun _ ->
redraw_queued := false;
redraw st (get_scale ()) hadj#value vadj#value canvas))
in
())
(*
if force then redraw st (get_scale ()) hadj#value vadj#value canvas else
if not !redraw_queued then
ignore (redraw_queued := true;
(*
Firebug.console##log(Js.string "sleep");
*)
Lwt_js.yield() >>= fun () ->
redraw_queued := false;
redraw st (get_scale ()) hadj#value vadj#value canvas;
Lwt.return ())
*)
in
let a = allocation () in
let zoom_factor = max (st.st_width /. float a.width) (st.st_height /. float a.height) in
set_zoom_factor zoom_factor;
let prev_scale = ref (get_scale ()) in
let rescale x y =
let scale = get_scale () in
let r = 1. -. (!prev_scale /. scale) in
hadj#set_value (hadj#value +. (hadj#page_size *. r *. x));
vadj#set_value (vadj#value +. (vadj#page_size *. r *. y));
prev_scale := scale;
invalidate_pixmap st.st_pixmap;
update_view false
in
let size = 16 in
let height = 300 - size in
let points d = Js.string (Printf.sprintf "%dpx" d) in
let size_px = points size in
let pos = ref height in
let thumb = Html.createDiv doc in
let style = thumb##.style in
style##.position := Js.string "absolute";
style##.width := size_px;
style##.height := size_px;
style##.top := points !pos;
style##.left := Js.string "0px";
style##.margin := Js.string "1px";
style##.backgroundColor := Js.string "black";
let slider = Html.createDiv doc in
let style = slider##.style in
style##.position := Js.string "absolute";
style##.width := size_px;
style##.height := points (height + size);
style##.border := Js.string "2px solid black";
style##.padding := Js.string "1px";
style##.top := Js.string "10px";
style##.left := Js.string "10px";
Dom.appendChild slider thumb;
Dom.appendChild doc##.body slider;
let set_slider_position pos' =
if pos' <> !pos
then (
thumb##.style##.top := points pos';
pos := pos';
sadj#set_value (float (height - pos') *. sadj#upper /. float height);
rescale 0.5 0.5)
in
handle_drag thumb (fun _dx dy -> set_slider_position (min height (max 0 (!pos + dy))));
slider##.onmousedown :=
Html.handler (fun ev ->
let ey = ev##.clientY in
let _, sy = Dom_html.elementClientPosition slider in
set_slider_position (max 0 (min height (ey - sy - (size / 2))));
Js._false);
let adjust_slider () =
let pos' = height - truncate ((sadj#value *. float height /. sadj#upper) +. 0.5) in
thumb##.style##.top := points pos';
pos := pos'
in
Html.window##.onresize :=
Html.handler (fun _ ->
let page = doc##.documentElement in
canvas##.width := page##.clientWidth;
canvas##.height := page##.clientHeight;
update_view true;
Js._true);
(* Drag the graph using the mouse *)
handle_drag canvas (fun dx dy ->
let scale = get_scale () in
let offset a d =
a#set_value (min (a#value -. (float d /. scale)) (a#upper -. a#page_size))
in
offset hadj dx;
offset vadj dy;
update_view true);
let bump_scale x y v =
let a = allocation () in
let x = x /. float a.width in
let y = y /. float a.height in
let prev = sadj#value in
let vl = min sadj#upper (max sadj#lower (prev +. (v *. sadj#step_increment))) in
if vl <> prev
then (
sadj#set_value vl;
adjust_slider ();
if x >= 0. && x <= 1. && y >= 0. && y <= 1. then rescale x y else rescale 0.5 0.5);
Js._false
in
(* Zoom using the mouse wheel *)
ignore
(Html.addMousewheelEventListener
canvas
(fun ev ~dx:_ ~dy ->
let ex, ey = Dom_html.elementClientPosition canvas in
let x = float (ev##.clientX - ex) in
let y = float (ev##.clientY - ey) in
if dy < 0
then bump_scale x y 1.
else if dy > 0
then bump_scale x y (-1.)
else Js._false)
Js._true);
(*
Html.addEventListener Html.document Html.Event.keydown
(Html.handler
(fun e -> Firebug.console##log(e##keyCode);
Js._true))
Js._true;
*)
(*
Html.addEventListener Html.document Html.Event.keypress
(Html.handler
(fun e ->
Firebug.console##log(Js.string "press");
match e##keyCode with
| 37 -> (* left *)
Js._false
| 38 -> (* up *)
Js._false
| 39 -> (* right *)
Js._false
| 40 -> (* down *)
Js._false
| _ ->
Firebug.console##log(- 1- e##keyCode);
Js._true))
Js._true;
*)
let handle_key_event ev =
match ev##.keyCode with
| 37 ->
(* left *)
hadj#set_value (hadj#value -. hadj#step_increment);
update_view false;
Js._false
| 38 ->
(* up *)
vadj#set_value (vadj#value -. vadj#step_increment);
update_view false;
Js._false
| 39 ->
(* right *)
hadj#set_value (hadj#value +. hadj#step_increment);
update_view false;
Js._false
| 40 ->
(* down *)
vadj#set_value (vadj#value +. vadj#step_increment);
update_view false;
Js._false
| _ ->
(*
Firebug.console##log_2(Js.string "keycode:", ev##keyCode);
*)
Js._true
in
let ignored_keycode = ref (-1) in
Html.document##.onkeydown :=
Html.handler (fun e ->
ignored_keycode := e##.keyCode;
handle_key_event e);
Html.document##.onkeypress :=
Html.handler (fun e ->
let k = !ignored_keycode in
ignored_keycode := -1;
if e##.keyCode = k then Js._true else handle_key_event e);
(*
Firebug.console##time(Js.string "initial drawing");
*)
update_view true;
(*
Firebug.console##timeEnd(Js.string "initial drawing");
Firebug.console##timeEnd(Js.string "init");
*)
Lwt.return ()
let _ =
Html.window##.onload :=
Html.handler (fun _ ->
ignore (start ());
Js._false)