/* 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)) ).