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/* $Id: colour.pl,v 1.10 2002/02/01 15:04:49 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(pce_colour_browser,
[ colour_browser/0
]).
:- use_module(library(pce)).
:- require([ absolute_file_name/3
, concat/3
, send_list/3
]).
:- multifile
user:file_search_path/2.
:- dynamic
user:file_search_path/2.
user:file_search_path(x11, OpenWin) :-
get(@pce, environment_variable, 'OPENWINHOME', OpenWin).
user:file_search_path(x11, '/usr/lib/X11').
user:file_search_path(x11, PceLib) :-
get(@pce, window_system, windows),
get(@pce, home, PceHome),
atom_concat(PceHome, '/lib', PceLib).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This demo implements a browser for the X11 predefined colours. The
colour browser assumes the X11 colour database is located in
x11('lib/rgb.txt').
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
colour_browser :-
make_colour_browser(CB),
send(CB, open).
make_colour_browser(CB) :-
absolute_file_name(x11(rgb),
[ extensions([txt]),
access(read),
file_errors(fail)
], DataBase), !,
make_colour_browser(CB, DataBase).
make_colour_browser(CB) :-
make_colour_browser(CB, @colour_names).
make_colour_browser(CB, DataBase) :-
new(D, dialog),
send(D, append, new(M, menu(which, choice))),
send_list(M, append, [foreground, background]),
send(M, selection, background),
send(new(CB, browser('XPCE (X11) named colours')), below, D),
send(CB, width, 33),
send(CB?key_binding, function, % pretend arrow up/down not only
cursor_down, % do the preview, but also show
and(message(CB, next_line),% the colour immediately
message(CB, enter))),
send(CB?key_binding, function,
cursor_up,
and(message(CB, previous_line),
message(CB, enter))),
% Make a picture with some different
% graphicals for preview
send(new(P, picture(size := size(100, 25))), below, CB),
send(P, format, new(Fmt, format(vertical, 1, @on))),
send(Fmt, adjustment, vector(center)),
send(P, display, graphical(0, 0, 0, 25)),
send(P, display, text(hello, left, normal)),
send(P, display, text(hello, left, bold)),
send(P, display, new(Box, box(30, 12))),
send(P, display, line(0, 0, 30, 0)),
send(Box, fill_pattern, @black_image),
% A colour is selected; call
% selected_colour/3, using the
% picture, fore/back ground and
% the description of the colour
send(CB, select_message,
message(@prolog, selected_colour, P, M?selection, @arg1?label)),
% set tab-stops for nice alignment
send(CB?image, tab_stops, vector(110, 140, 170)),
% scan de database
( send(DataBase, instance_of, hash_table)
-> send(DataBase, for_all,
message(@prolog, append_colour, CB, @arg1, @arg2)),
send(CB, sort)
; new(F, file(DataBase)),
( send(F, open, read)
-> repeat,
( get(F, read_line, String)
-> get(String, scan, '%d%d%d%*[ ]%[a-zA-Z0-9_ ]',
vector(R, G, B, Name)),
send(Name, translate, ' ', '_'),
send(Name, downcase),
get(Name, value, Atom),
( get(CB, member, Atom, _)
-> true
; send(CB, append,
dict_item(Name,
string('%s\t%d\t%d\t%d',
Name, R, G, B)))
),
fail
; !,
send(F, close)
)
)
).
append_colour(CB, Name, RGB) :-
B is RGB >> 16,
G is (RGB >> 8) /\ 255,
R is (RGB /\ 255),
send(CB, append, string('%s\t%d\t%d\t%d', Name, R, G, B)).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
A colour was selected. Change the colour attribute of the picture window.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
selected_colour(P, Which, Label) :-
get(Label, scan, '%s%d%d%d', vector(NameStr, R, G, B)),
send(@display, cut_buffer, 0, NameStr),
XR is R * 257,
XG is G * 257,
XB is B * 257,
send(P, Which, colour(@default, XR, XG, XB)).
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