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(**************************************************************************)
(* *)
(* This file is part of OcamlGraph. *)
(* *)
(* Copyright (C) 2009-2010 *)
(* CEA (Commissariat l'nergie Atomique) *)
(* *)
(* you can redistribute it and/or modify it under the terms of the GNU *)
(* Lesser General Public License as published by the Free Software *)
(* Foundation, version 2.1, with a linking exception. *)
(* *)
(* It 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. *)
(* *)
(* See the file ../LICENSE for more details. *)
(* *)
(* Authors: *)
(* - Julien Signoles (Julien.Signoles@cea.fr) *)
(* - Jean-Denis Koeck (jdkoeck@gmail.com) *)
(* - Benoit Bataille (benoit.bataille@gmail.com) *)
(* *)
(**************************************************************************)
open DGraphViewItem
let ($) f x = f x
let distance x y = if x > y then x - y else y - x
class type ['vertex, 'edge, 'cluster] view = object
inherit GnoCanvas.canvas
method model : ('vertex, 'edge, 'cluster) DGraphModel.abstract_model
method get_node : 'vertex -> 'vertex view_item
method get_edge : 'edge -> 'edge view_item
method get_cluster : 'cluster -> 'cluster view_item
method iter_nodes: ('vertex view_item -> unit) -> unit
method iter_edges: ('vertex view_item -> 'vertex view_item -> unit) -> unit
method iter_edges_e: ('edge view_item -> unit) -> unit
method iter_clusters: ('cluster view_item -> unit) -> unit
method iter_succ: ('vertex view_item -> unit) -> 'vertex view_item -> unit
method iter_pred: ('vertex view_item -> unit) -> 'vertex view_item -> unit
method iter_succ_e: ('edge view_item -> unit) -> 'vertex view_item -> unit
method iter_pred_e: ('edge view_item -> unit) -> 'vertex view_item -> unit
method iter_associated_vertex:
('vertex view_item -> unit) -> 'vertex view_item -> unit
method mem_edge: 'vertex view_item -> 'vertex view_item -> bool
method find_edge: 'vertex view_item -> 'vertex view_item -> 'edge view_item
method src: 'edge view_item -> 'vertex view_item
method dst: 'edge view_item -> 'vertex view_item
method zoom_factor : float
method zoom_to : float -> unit
method zoom_in : unit -> unit
method zoom_out : unit -> unit
method adapt_zoom : unit -> unit
method center_node: 'vertex view_item -> unit
method set_zoom_padding: float -> unit
method connect_highlighting_event: unit -> unit
method highlight: ?color: int32 * int32 -> 'vertex view_item -> unit
method dehighlight: 'vertex view_item -> unit
end
module type S = sig
type vertex
type edge
type cluster
val view:
?aa:bool (** Anti-aliasing *) ->
?delay_node:(vertex -> bool) ->
?delay_edge:(edge -> bool) ->
?delay_cluster:(cluster -> bool) ->
?border_width:int ->
?width:int ->
?height:int ->
?packing:(GObj.widget -> unit) ->
?show:bool ->
(vertex, edge, cluster) DGraphModel.abstract_model ->
(vertex, edge, cluster) view
(** View as a Gnome Canvas.
Support zooming and scrolling. *)
end
(* ************************************************************************* *)
(** View from a model *)
(* ************************************************************************* *)
module Make(V: Sig.HASHABLE)(E: Sig.HASHABLE)(C: Sig.HASHABLE) = struct
type vertex = V.t
type edge = E.t
type cluster = C.t
module HV = Hashtbl.Make(V)
module HE = Hashtbl.Make(E)
module HC = Hashtbl.Make(C)
(* Widget derived from Gnome Canvas.
Supports zooming and scrolling *)
class view
?delay_node ?delay_edge ?delay_cluster
obj
(model : (V.t, E.t, C.t) DGraphModel.abstract_model)
=
let delay f v = match f with None -> false | Some f -> f v in
let (x1, y1), (x2, y2) = model#bounding_box in
object(self)
inherit GnoCanvas.canvas obj
method model = model
(* Hash tables from the model to the view items*)
val node_hash : V.t view_item HV.t = HV.create 17
val edge_hash : E.t view_item HE.t = HE.create 17
val cluster_hash : C.t view_item HC.t = HC.create 7
(* Canvas items creation *)
method private add_vertex vertex =
try
let layout = model#get_vertex_layout vertex in
let item =
view_node
~delay:(delay delay_node vertex)
~view:(self :> common_view) ~vertex ~layout ()
in
HV.add node_hash vertex item
with Not_found ->
assert false
method private add_edge edge =
try
let layout = model#get_edge_layout edge in
let item =
view_edge
~delay:(delay delay_edge edge)
~view:(self:>common_view) ~edge ~layout ()
in
HE.add edge_hash edge item
with Not_found ->
assert false
method private add_cluster cluster =
let layout = model#get_cluster_layout cluster in
let item =
view_cluster
~delay:(delay delay_cluster cluster)
~view:(self :> common_view) ~cluster ~layout ()
in
HC.add cluster_hash cluster item
(* From model to view items *)
method get_node n =
try HV.find node_hash n with Not_found -> assert false
method get_edge e =
try HE.find edge_hash e with Not_found -> assert false
method get_cluster c =
try HC.find cluster_hash c with Not_found -> assert false
(* Iterate on nodes and edges *)
method iter_nodes f = HV.iter (fun _ v -> f v) node_hash
method iter_edges_e f = HE.iter (fun _ e -> f e) edge_hash
method iter_clusters f = HC.iter (fun _ c -> f c) cluster_hash
method iter_edges f =
model#iter_edges (fun v1 v2 -> f (self#get_node v1) (self#get_node v2))
(* Iterate on successors of a node *)
method iter_succ f (node: 'v view_item) =
let f' v = f (self#get_node v) in
model#iter_succ f' node#item
(* Iterate on predecessors of a node *)
method iter_pred f (node: 'v view_item) =
let f' v = f (self#get_node v) in
model#iter_pred f' node#item
method iter_succ_e f (node: 'v view_item) =
let f' e = f (self#get_edge e) in
model#iter_succ_e f' node#item
method iter_pred_e f (node: 'v view_item) =
let f' e = f (self#get_edge e) in
model#iter_pred_e f' node#item
(* Iterate on associated nodes *)
method iter_associated_vertex f (node: 'v view_item) =
let f' v = f (self#get_node v) in
model#iter_associated_vertex f' node#item
(* Membership functions *)
method mem_edge (n1:'v view_item) (n2:'v view_item) =
model#mem_edge n1#item n2#item
method find_edge (n1:'v view_item) (n2:'v view_item) =
self#get_edge (model#find_edge n1#item n2#item)
method src (e: 'e view_item) = self#get_node (model#src e#item)
method dst (e: 'e view_item) = self#get_node (model#dst e#item)
(* Zoom factor *)
val mutable zoom_f = 1.
method zoom_factor = zoom_f
val mutable zoom_padding = 0.1
method set_zoom_padding n = zoom_padding <- n
method private set_zoom_f x = if x > 1e-10 then zoom_f <- x
(* Zoom to a particular factor *)
method zoom_to x =
self#set_zoom_f x;
self#set_pixels_per_unit zoom_f;
self#iter_clusters (fun c -> c#zoom_text zoom_f);
self#iter_nodes (fun n -> n#zoom_text zoom_f);
self#iter_edges_e (fun e -> e#zoom_text zoom_f)
method zoom_in () = self#zoom_to (zoom_f +. zoom_padding *. zoom_f)
method zoom_out () = self#zoom_to (zoom_f -. zoom_padding *. zoom_f)
method center_node (node:V.t view_item) =
node#center ()
(* self#zoom_in ();*)
method adapt_zoom () =
let width = self#hadjustment#page_size in
let height = self#vadjustment#page_size in
let w_zoom = width /. abs_float (x1-.x2) in
let h_zoom = height /. abs_float (y1-.y2) in
self#zoom_to (min 1. (min w_zoom h_zoom))
(* EVENTS *)
(* Zoom with the keys *)
method private zoom_keys_ev ev =
match GdkEvent.Key.keyval ev with
| k when k = GdkKeysyms._KP_Subtract -> self#zoom_out (); true
| k when k = GdkKeysyms._KP_Add -> self#zoom_in (); true
| _ -> false
(* Zoom with the mouse *)
method private zoom_mouse_ev ev =
match GdkEvent.Scroll.direction ev with
| `UP -> self#zoom_in (); true
| `DOWN -> self#zoom_out (); true
| _ -> false
method highlight ?color node =
let h e = e#highlight ?color () in
h node;
self#iter_associated_vertex (fun v ->
h v;
self#iter_succ_e h v;
self#iter_pred_e h v)
node
method dehighlight node =
let h e = e#dehighlight () in
h node;
self#iter_associated_vertex (fun v ->
h v;
self#iter_succ_e h v;
self#iter_pred_e h v)
node
method connect_highlighting_event () =
let connect node =
let callback = function
| `MOTION_NOTIFY _ -> self#highlight node; false
| `LEAVE_NOTIFY _ -> self#dehighlight node; false
| _ -> false
in
node#connect_event ~callback
in
self#iter_nodes connect
initializer
(* Create and add items from the model vertices, edges and clusters *)
model#iter_clusters self#add_cluster;
model#iter_vertex self#add_vertex;
model#iter_edges_e self#add_edge;
(* Scroll region management *)
ignore $ self#set_center_scroll_region true;
ignore $ self#set_scroll_region ~x1 ~y1 ~x2 ~y2 ;
(* Attach zoom events *)
ignore $ self#event#connect#key_press self#zoom_keys_ev;
ignore $ self#event#connect#scroll self#zoom_mouse_ev;
end
let view
?(aa=false) ?delay_node ?delay_edge ?delay_cluster
?border_width ?width ?height ?packing ?show
(model:(vertex, edge, cluster) DGraphModel.abstract_model) =
let canvas =
GnoCanvas.canvas ~aa ?border_width ?width ?height ?show ?packing ()
in
(* Grab focus to process keyboard input *)
ignore $ canvas#event#connect#enter_notify
(fun _ -> canvas#misc#grab_focus () ; false);
let view =
new view ?delay_node ?delay_edge ?delay_cluster
(Gobject.unsafe_cast canvas#as_widget)
model
in
view
end
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