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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:
;;
;; Game data structure.
;;
;;; Code:
(define-module (2d game)
#:use-module (2d private game)
#:use-module (2d game-loop)
#:use-module (2d helpers)
#:use-module (2d observer)
#:use-module (2d vector2))
;;;
;;; Scenes
;;;
;; When no event callbacks are specified for a scene, these
;; (hopefully) convenient defaults will be used.
(define %default-scene-events
`((quit . ,(lambda (state) (quit-game-loop!)))
(key-down . ,(lambda (state key mode unicode)
(when (any-equal? key 'escape 'q)
(quit-game-loop!))))))
(define (default-scene-events)
(copy-tree %default-scene-events))
(define* (make-scene #:optional #:key
(title "A Guile-2D Scene")
(events (default-scene-events))
(update (lambda (s) #f))
(draw (lambda (s) #f))
(state #f))
"Return a new scene. TITLE is a human readable name for the
scene. EVENTS is an alist of event handlers. UPDATE is a procedure
that updates the scene. DRAW is a procedure that renders the
scene. STATE is an object that encapsulates the scene state."
(%make-scene title (alist->observer events) update draw state))
(define-syntax-rule (define-scene name kwargs ...)
"Syntactic sugar over define and make-scene. Return a procedure that
creates a new scene."
(define (name) (make-scene kwargs ...)))
(re-export <scene>
scene?
scene-title
scene-observer
scene-update-proc
scene-draw-proc
scene-state
scene-trigger
scene-update
scene-draw
push-scene
replace-scene
pop-scene)
(export make-scene
define-scene
default-scene-events)
;;;
;;; Games
;;;
(define* (make-game #:optional #:key
(title "A Guile-2D Game")
(resolution (vector2 640 480))
(fullscreen #f)
(first-scene #f))
"Return a new game. All game properties have some reasonable default
value."
(%make-game title resolution fullscreen first-scene))
(define-syntax-rule (define-game name kwargs ...)
"Syntactic sugar over define and make-game."
(define name (make-game kwargs ...)))
(re-export <game>
game?
game-title
game-resolution
game-fullscreen?
game-first-scene
run-game)
(export make-game
define-game)
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