--- /dev/null
+;;; Gacela, a GNU Common Lisp extension for fast games development
+;;; Copyright (C) 2009 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/>.
+
+
+(eval-when (compile load eval)
+ (when (not (find-package 'gacela)) (make-package 'gacela :nicknames '(gg) :use '(lisp)))
+ (in-package 'gacela :nicknames '(gg) :use '(lisp)))
+
+
+;;; Boxes Factory
+
+(let (visible-boxes boxes-to-add boxes-to-quit)
+ (defun add-box (box)
+ (push box boxes-to-add))
+
+ (defun quit-box (box)
+ (push box boxes-to-quit))
+
+ (defun quit-all-boxes ()
+ (setq visible-boxes nil boxes-to-add nil boxes-to-quit nil))
+
+ (defun refresh-visible-boxes ()
+ (cond (boxes-to-add
+ (setq visible-boxes (union visible-boxes boxes-to-add))
+ (setq boxes-to-add nil)))
+ (cond (boxes-to-quit
+ (setq visible-boxes (reverse (set-difference visible-boxes boxes-to-quit)))
+ (setq boxes-to-quit nil))))
+
+ (defun render-boxes ()
+ (labels ((render (l)
+ (cond (l (funcall (render-fun-name (car l)))
+ (render (cdr l))))))
+ (render visible-boxes))))
+
+
+(defun render-fun-name (name)
+ (intern (concatenate 'string "RENDER-BOX-" (string name)) 'gacela))
+
+(defun get-props-fun-name (name)
+ (intern (concatenate 'string "GET-PROPERTIES-BOX-" (string name)) 'gacela))
+
+(defmacro make-box (name properties &rest code)
+ `(progn
+ (let ,(union '((rx 0) (ry 0) (rz 0)) properties)
+ (defun ,(render-fun-name name) () ,@code)
+ (defun ,(get-props-fun-name name) () (list :rx rx :ry ry :rz rz)))
+ (add-box ',name)))
+
+
+;;; Translations and rotations
+
+(defun rotate-box (&rest rot)
+ )
\ No newline at end of file