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/* $Id: pce_image.pl,v 1.9 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_image,
[ pce_image_directory/1
]).
:- use_module(library(pce)).
:- require([ absolute_file_name/3
, concat_atom/2
, is_absolute_file_name/1
]).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Prepend the given directory to the image search-path. Useful for
applications defining a private image directory.
Typically one would put all images required by an application in *.xpm
files in a directory called bitmaps. The load file of the application
makes a call
:- pce_image_directory(bitmaps).
after which the images from the directory may be accessed using -for
example-:
send(Box, fill_pattern, image('my_image.bm')).
See also the ImageViewer demo tool to get an overview of available
images in a directory.
Images and program resources
----------------------------
pce_image_directory/1 prepends the given directory to the
file_search_path/2 declarations using the alias `image'. Especially if
the application should (eventually) be turned into a runtime, the
following skeleton for using images as program resources is adviced:
resource(cute, image, image('cute.xpm')).
...
new(I, image(resource(cute)),
...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
pce_image_directory(Dir) :-
( atom(Dir)
-> ( \+ is_absolute_file_name(Dir),
prolog_load_context(directory, Cwd)
-> concat_atom([Cwd, /, Dir], DirPath)
; DirPath = Dir
),
asserta(user:file_search_path(image, DirPath))
; asserta(user:file_search_path(image, Dir)),
absolute_file_name(Dir,
[ file_type(directory),
access(read)
], DirPath)
),
get(class(image), class_variable, path, PathVar),
get(PathVar, value, Path),
send(PathVar, value, string('%s:%s', DirPath, Path)).
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