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/* 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
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(pce_image,
[ pce_image_directory/1
]).
:- use_module(library(pce)).
:- require([ absolute_file_name/3
, atomic_list_concat/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)
-> atomic_list_concat([Cwd, /, Dir], DirPath)
; DirPath = Dir
),
asserta(user:file_search_path(image, DirPath))
; asserta(user:file_search_path(image, Dir)),
absolute_file_name(Dir, DirPath,
[ file_type(directory),
access(read)
])
),
( compiling,
get(@display, open, @off) % don't force the display
% when compiling
-> true
; get(class(image), class_variable, path, PathVar),
get(PathVar, value, Path),
send(PathVar, value, string('%s:%s', DirPath, Path))
).
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