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;;; guile-2d
;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
;;;
;;; Guile-2d is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-2d 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
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Scenes describe the behavioral aspects of a game.
;;
;;; Code:
(define-module (2d scene)
#:use-module (srfi srfi-9)
#:use-module (2d observer)
#:export (<scene>
make-scene
scene?
scene-name
scene-init
scene-enter
scene-exit
scene-draw
scene-update
scene-observer
init-scene
enter-scene
exit-scene
draw-scene
update-scene
scene-trigger
default-events))
(define-record-type <scene>
(%make-scene name init enter exit draw update observer)
scene?
(name scene-name)
(init scene-init)
(enter scene-enter)
(exit scene-exit)
(draw scene-draw)
(update scene-update)
(observer scene-observer))
(define no-op (lambda args #f))
(define default-events (make-parameter '()))
(define* (make-scene name
#:optional #:key
(init no-op)
(enter no-op)
(exit no-op)
(draw no-op)
(update no-op)
(events (default-events)))
"Create a new scene object. All callbacks default to a no-op."
(%make-scene name init enter exit draw update
(alist->observer events)))
(define (init-scene scene)
"Return the value returned by the state constructor thunk for
SCENE."
((scene-init scene)))
(define (enter-scene scene state)
"Call enter callback for SCENE with STATE."
((scene-enter scene) state))
(define (exit-scene scene state)
"Call the exit callback for SCENE with STATE."
((scene-exit scene) state))
(define (draw-scene scene state)
"Call the draw callback for SCENE with STATE."
((scene-draw scene) state))
(define (update-scene scene state)
"Call the update callback for SCENE with STATE."
((scene-update scene) state))
(define (scene-trigger scene state event . args)
(apply observer-trigger (scene-observer scene) event state args))
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