Better examples

[gacela.git] / src / examples / entity-component-functions.scm

diff --git a/src/examples/entity-component-functions.scm b/src/examples/entity-component-functions.scm
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+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2013 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; 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 3 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 General Public License
+;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (gacela examples entity-component-functions)
+  #:use-module (gacela system)
+  #:use-module (ice-9 receive))
+
+
+(define-component a x y)
+(define-component b)
+
+(define (entity-component-functions)
+  (let ((entities '())
+       (components '())
+       (key #f))
+    (receive (e c k) ((new-entity (make-a 1 2) (make-b)) entities components)
+      (set! entities e)
+      (set! components c)
+      (set! key k)
+      (display k) (newline))
+    (format #t "New entity with a and b:~%~a~%~a~%~%" entities components)
+
+    (receive (e c k) ((new-entity (make-a 10 20)) entities components)
+      (set! entities e)
+      (set! components c)
+      (display k) (newline))
+    (format #t "New entity with a:~%~a~%~a~%~%" entities components)
+
+    (receive (e c) (modify-entities (list (set-entity-components key (make-a 50 50)) (remove-entity-components key 'b)) entities components)
+      (set! entities e)
+      (set! components c))
+    (format #t "First entity removes b and changes a:~%~a~%~a~%~%" entities components)
+
+    (receive (e c) ((remove-entity key) entities components)
+      (set! entities e)
+      (set! components c))
+    (format #t "Removes first entity:~%~a~%~a~%~%" entities components)
+
+    (receive (e c k) ((new-entity (make-a 1 2) (make-b)) entities components)
+      (set! entities e)
+      (set! components c)
+      (set! key k)
+      (display k) (newline))
+    (format #t "New entity with a and b:~%~a~%~a~%~%" entities components)
+
+    (receive (e c) (modify-entities (list (set-entity-components key (make-a 50 50)) (remove-entity-components key 'b) (new-entity (make-a 1000 1000))) entities components)
+      (set! entities e)
+      (set! components c))
+    (format #t "Last entity removes b and changes a, and new entity with a:~%~a~%~a~%~%" entities components)
+
+    (receive (e c) (modify-entities (list (remove-entity key)) entities components)
+      (set! entities e)
+      (set! components c))
+    (format #t "Remove last entity:~%~a~%~a~%~%" entities components)))
+
+(export entity-component-functions)