X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=gacela_entities.lisp;fp=gacela_entities.lisp;h=c4ac79b6d470bf8e7724b0c697a359442859548f;hb=0678570f5ab17948ac2c1c23821abbcbc0a8bbb6;hp=0000000000000000000000000000000000000000;hpb=91e3209f15176fa1503199b6c77fa5fc4ee85e3a;p=gacela.git

diff --git a/gacela_entities.lisp b/gacela_entities.lisp
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+;;; 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)))
+
+
+;;; Behaviours of entities
+
+(defmacro make-behaviour (name properties &rest code)
+  `(defun ,name (entity)
+     (let ,(mapcar #'property-definition properties)
+       ,@code
+       ,(cons 'progn (mapcar #'property-save properties))
+       entity)))
+
+(defun property-name (property)
+  (intern (string property) 'keyword))
+
+(defun property-definition (property)
+  (let* ((name (cond ((listp property) (car property))
+		     (t property)))
+	 (pname (property-name name))
+	 (value (cond ((listp property) (cadr property)))))
+    `(,name (getf entity ,pname ,value))))
+
+(defun property-save (property)
+  (let* ((name (cond ((listp property) (car property))
+		     (t property)))
+	 (pname (property-name name)))
+    `(setf (getf entity ,pname) ,name)))
+
+
+
+;;; Constructor
+
+;;; 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)))