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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 mouse)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module (2d game)
#:use-module (2d signals)
#:use-module (2d vector2)
#:export (mouse-position
mouse-last-down
mouse-last-up
mouse-down?))
(define mouse-last-down (make-signal))
(define mouse-last-up (make-signal))
(define mouse-position (make-signal (vector2 0 0)))
(define (mouse-down? button)
"Create a signal for the state of BUTTON. Value is #t when mouse
button is pressed and #f otherwise."
(make-signal
#:filter (lambda (value old from)
(eq? value button))
#:transformer (lambda (value old from)
(if (eq? from mouse-last-down) #t #f))
#:connectors (list mouse-last-down mouse-last-up)))
(register-event-handler
'mouse-motion
(lambda (e)
(signal-set! mouse-position
(vector2 (SDL:event:motion:x e)
(SDL:event:motion:y e)))))
(register-event-handler
'mouse-down
(lambda (e)
(signal-set! mouse-last-down (SDL:event:button:button e))))
(register-event-handler
'mouse-up
(lambda (e)
(signal-set! mouse-last-up (SDL:event:button:button e))))
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