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;;; Lisparuga
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; Lisparuga 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.
;;;
;;; Lisparuga 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 Lisparuga. If not, see <http://www.gnu.org/licenses/>.
(define-module (lisparuga utils)
#:use-module (sly input keyboard)
#:use-module (sly math rect)
#:use-module (sly math vector)
#:use-module (sly signal)
#:export (resolution
origin2
bounds
key-toggle))
(define resolution (vector2 120 160))
(define origin2 (vector2 0 0))
(define bounds (make-rect (vector2 0 0) resolution))
(define (key-toggle key)
"Create a signal that is initially #f and toggles between #t and #f
each time KEY is pressed."
(signal-fold (lambda (down? previous)
(and down? (not previous)))
#f
(signal-filter identity #f
;; Ignore repeated key down signals.
(signal-drop-repeats (key-down? key)))))
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