1 ;;; Gacela, a GNU Guile extension for fast games development
2 ;;; Copyright (C) 2013 by Javier Sancho Fernandez <jsf at jsancho dot org>
4 ;;; This program is free software: you can redistribute it and/or modify
5 ;;; it under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation, either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; This program is distributed in the hope that it will be useful,
10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;; GNU General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
18 (define-module (gacela examples making-systems)
19 #:use-module (gacela system)
20 #:use-module (ice-9 receive))
23 (define-component a x y)
26 (list (new-entity (make-a 1 2))
27 (new-entity (make-a 10 20))))
29 (define-system s2 ((with-a (a)))
32 (format #t "Key: ~a Component: ~a~%" (get-key e) (get-component 'a e)))
36 (define (making-systems)
39 (receive (e c) ((s1 entities components))
42 (format #t "Two new entities with a:~%~a~%~a~%~%" entities components)
44 ((s2 entities components))))
46 (export making-systems)