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/* $Id: importpl.pl,v 1.6 2002/02/01 15:04:51 jan Exp $
Part of XPCE --- The SWI-Prolog GUI toolkit
Author: Jan Wielemaker and Anjo Anjewierden
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi.psy.uva.nl/projects/xpce/
Copyright (C): 1985-2002, University of Amsterdam
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 General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(draw_importpl,
[ realise_drawing/2 % +Device, +Term
]).
:- use_module(library(pce)).
:- require([ maplist/3
]).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Support library to import drawings from PceDraw into applications. To
use this library, make a drawing in PceDraw, and export it as a Prolog
term, either by dragging the icon at the top-right corner of PceDraw
onto a PceEmacs window running in Prolog mode, or by selecting the `Copy
To ClipBoard' option from the popup on this image and pasting in any
text editor.
The term returned is what is needed as the second argument to
realise_drawing/2. The drawing is placed at the same coordinates as the
initial drawing. If realised the drawing is realised on a device object
(or figure object), the method ->reference may be used to place the
reference point of the device at the top-left corner of the bounding box
of the drawing.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
% realise_drawing(Device, Drawing)
%
% Recreates the drawing at the indicates device. Drawing is a term
% as created by the PceDraw package library('draw/exportpl.pl'). This
% file contains a definition of the format of the Drawing term.
realise_drawing(Device, drawing(Objects)) :- !,
draw(Objects, Device).
realise_drawing(Device, Objects) :-
draw(Objects, Device).
draw([], _).
draw([display(Term, Point)|T], Device) :-
term_to_object(Term, Object),
send(Device, display, Object, Point),
draw(T, Device).
draw([display(Term)|T], Device) :-
term_to_object(Term, Object),
send(Device, display, Object),
draw(T, Device).
draw([connect(Term)|T], Device) :-
term_to_connection(Term, _Connection),
draw(T, Device).
draw([compound(Term, Contents, Point)|T], Device) :-
term_to_object(Term, SubDev),
realise_drawing(SubDev, Contents),
send(Device, display, SubDev, Point),
draw(T, Device).
term_to_object(Term+Attribute, Object) :- !,
term_to_object(Term, Object),
Attribute =.. [Selector|PlArgs],
maplist(term_to_object, PlArgs, Args),
Goal =.. [send, Object, Selector | Args],
Goal.
term_to_object(Atomic, Atomic) :-
atomic(Atomic), !.
term_to_object(new(Object, Term), Object) :- !,
new(Object, Term).
term_to_object(Term, Object) :-
new(Object, Term).
term_to_connection(Term+Attribute, Connection) :- !,
term_to_connection(Term, Connection),
Attribute =.. [Selector|PlArgs],
maplist(term_to_object, PlArgs, Args),
Goal =.. [send, Connection, Selector | Args],
Goal.
term_to_connection(Term, Connection) :-
Term =.. [Class, From, To, FH, TH],
make_link(FH, TH, Link),
NewTerm =.. [Class, From, To, Link],
new(Connection, NewTerm),
attach_handle(From, FH),
attach_handle(To, TH).
attach_handle(Graphical, handle(_, _, _, Name)) :-
get(Graphical, handle, Name, _), !.
attach_handle(Graphical, Handle) :-
send(Graphical, handle, Handle).
:- dynamic
link_store/3.
link_store(link, link, @default).
make_link(FH, TH, Link) :-
handle_kind(FH, FName),
handle_kind(TH, TName),
( link_store(FName, TName, Link)
-> true
; new(Link, link(FName, TName)),
send(Link, lock_object, @on),
asserta(link_store(FName, TName, Link))
).
handle_kind(handle(_X, _Y, Kind, _Name), Kind).
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