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 entity-component-functions)
19 #:use-module (gacela system)
20 #:use-module (ice-9 receive))
23 (define-component a x y)
26 (define (entity-component-functions)
27 (let ((entities (make-entity-set))
29 (receive (e k) ((new-entity (make-a 1 2) (make-b)) entities)
32 (format #t "New entity with a and b:~%~a~%~%" (entity-list entities))
34 (receive (e k) ((new-entity (make-a 10 20)) entities)
36 (format #t "New entity with a:~%~a~%~%" (entity-list entities))
38 (set! entities (modify-entities entities (list (set-entity-components key (make-a 50 50)) (remove-entity-components key 'b))))
39 (format #t "First entity removes b and changes a:~%~a~%~%" (entity-list entities))
41 (set! entities ((remove-entity key) entities))
42 (format #t "Removes first entity:~%~a~%~%" (entity-list entities))
44 (receive (e k) ((new-entity (make-a 1 2) (make-b)) entities)
47 (format #t "New entity with a and b:~%~a~%~%" (entity-list entities))
49 (set! entities (modify-entities entities (list (set-entity-components key (make-a 50 50)) (remove-entity-components key 'b) (new-entity (make-a 1000 1000)))))
50 (format #t "Last entity removes b and changes a, and new entity with a:~%~a~%~%" (entity-list entities))
52 (set! entities (modify-entities entities (list (remove-entity key))))
53 (format #t "Remove last entity:~%~a~%~%" (entity-list entities))))
55 (export entity-component-functions)