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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:
;;
;; Keyboard signals.
;;
;;; Code:
(define-module (2d keyboard)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module (2d game)
#:use-module (2d signals)
#:use-module (2d vector2)
#:export (key-press-hook
key-release-hook
key-last-down
key-last-up
key-down?
key-directions
key-arrows
key-wasd))
(define key-press-hook (make-hook 2))
(define key-release-hook (make-hook 2))
(define key-last-down (make-root-signal 'none))
(define key-last-up (make-root-signal 'none))
(define (key-down? key)
"Create a signal for the state of KEY. The signal value is #t when
KEY is pressed or #f otherwise."
(define (same-key? other-key)
(eq? key other-key))
(define (key-filter value signal)
(signal-constant value (signal-filter same-key? #f signal)))
(signal-merge (key-filter #f key-last-up)
(key-filter #t key-last-down)))
(define (key-directions up down left right)
(signal-map (lambda (up? down? left? right?)
;; (display (list up? down? left? right?))
;; (newline)
(vector2 (+ (if left? -1 0)
(if right? 1 0))
(+ (if up? -1 0)
(if down? 1 0))))
(key-down? up)
(key-down? down)
(key-down? left)
(key-down? right)))
(define key-arrows (key-directions 'up 'down 'left 'right))
(define key-wasd (key-directions 'w 's 'a 'd))
(register-event-handler
'key-down
(lambda (e)
(run-hook key-press-hook
(SDL:event:key:keysym:sym e)
(SDL:event:key:keysym:unicode e))
(signal-set! key-last-down (SDL:event:key:keysym:sym e))))
(register-event-handler
'key-up
(lambda (e)
(run-hook key-release-hook
(SDL:event:key:keysym:sym e)
(SDL:event:key:keysym:unicode e))
(signal-set! key-last-up (SDL:event:key:keysym:sym e))))
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