1 (* Copyright (C) 2006, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
30 type attribute = string * string (* <key, value> pair *)
32 let png_flags = "-Tpng"
33 let map_flags = "-Tcmapx"
34 let tred_cmd = "tred" (* graphviz transitive reduction filter *)
36 let tempfile () = Filename.temp_file "matita_" ""
38 class type graphviz_widget =
40 method load_graph_from_file: string -> unit
42 (GdkEvent.Button.t -> (string * string) list -> unit) -> unit
43 method center_on_href: string -> unit
44 method as_image: GMisc.image
45 method as_viewport: GBin.viewport
48 class graphviz_impl ?packing gviz_cmd =
49 let viewport = GBin.viewport ?packing () in
50 let mk_gviz_cmd flags src_fname dest_fname =
51 sprintf "cat %s | %s | %s %s > %s" src_fname tred_cmd gviz_cmd flags
54 GMisc.image ~packing:viewport#add ~xalign:0. ~yalign:0. ~xpad:0 ~ypad:0 ()
57 match List.map float_of_string (HExtlib.split ~sep:',' s) with
58 | [x1; y1; x2; y2 ] -> x1, y1, x2, y2
59 | _ -> assert false in
61 val mutable href_cb = fun _ _ -> ()
62 val mutable map = [] (* list of associative list attr name -> attr value *)
65 ignore (viewport#event#connect#button_press (fun button ->
66 (*eprintf "x: %f; y: %f;\n%!" (GdkEvent.Button.x button +. viewport#hadjustment#value) (GdkEvent.Button.y button +. viewport#vadjustment#value);*)
67 (* compute coordinates relative to image origin *)
68 let x = GdkEvent.Button.x button +. viewport#hadjustment#value in
69 let y = GdkEvent.Button.y button +. viewport#vadjustment#value in
70 (try href_cb button (self#find_href x y) with Not_found -> ());
73 method load_graph_from_file fname =
74 let tmp_png = tempfile () in
75 let rc = Sys.command (mk_gviz_cmd png_flags fname tmp_png) in
78 ("Graphviz command failed (exit code: %d) on the following graph:\n"
80 rc (HExtlib.input_file fname);
81 image#set_file tmp_png;
82 HExtlib.safe_remove tmp_png;
83 let tmp_map = tempfile () in
84 ignore (Sys.command (mk_gviz_cmd map_flags fname tmp_map));
85 self#load_map tmp_map;
86 HExtlib.safe_remove tmp_map
88 method private load_map fname =
91 XmlPushParser.create_parser
92 { XmlPushParser.default_callbacks with
93 XmlPushParser.start_element =
94 Some (fun elt attrs ->
96 | "area" -> areas := attrs :: !areas
98 XmlPushParser.parse p (`File fname);
101 method private find_href x y =
104 let x1, y1, x2, y2 = parse_coords (List.assoc "coords" attrs) in
105 x1 <= x && x <= x2 && y1 <= y && y <= y2)
109 (cb: GdkEvent.Button.t -> (string * string) list -> unit)
113 method center_on_href href =
114 (*eprintf "Centering viewport on uri %s\n%!" href;*)
118 try List.assoc "href" attrs = href with Not_found -> false)
121 let x1, y1, x2, y2 = parse_coords (List.assoc "coords" attrs) in
122 viewport#hadjustment#clamp_page ~lower:x1 ~upper:x2;
123 viewport#vadjustment#clamp_page ~lower:y1 ~upper:y2;
126 method as_image = image
127 method as_viewport = viewport
131 let factory cmd ?packing () =
132 (new graphviz_impl ?packing cmd :> graphviz_widget)
134 let gDot = factory "dot"
135 let gNeato = factory "neato"
136 let gTwopi = factory "twopi"
137 let gCirco = factory "circo"
138 let gFdp = factory "fdp"