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;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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/>.
;;; Commentary:
;;
;; Keyboard signals.
;;
;;; Code:
(define-module (sly input keyboard)
#:use-module ((sdl2 events) #:prefix sdl2:)
#:use-module (sly event)
#:use-module (sly signal)
#:use-module (sly math vector)
#: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 1))
(register-event-handler
'key-down
(lambda (e)
(run-hook key-press-hook (sdl2:keyboard-event-key e))))
(define-signal key-last-down
(hook->signal key-press-hook 'none identity))
(define key-release-hook (make-hook 1))
(register-event-handler
'key-up
(lambda (e)
(run-hook key-release-hook (sdl2:keyboard-event-key e))))
(define-signal key-last-up
(hook->signal key-release-hook 'none identity))
(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?)
(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-signal key-arrows (key-directions 'up 'down 'left 'right))
(define-signal key-wasd (key-directions 'w 's 'a 'd))
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