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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-x
mouse-y
mouse-position
mouse-last-down
mouse-last-up
mouse-down?))
(define mouse-last-down (make-root-signal 'none))
(define mouse-last-up (make-root-signal 'none))
(define mouse-x (make-root-signal 0))
(define mouse-y (make-root-signal 0))
(define mouse-position (signal-map vector2 mouse-x mouse-y))
(define (mouse-down? button)
"Create a signal for the state of BUTTON. Value is #t when mouse
button is pressed or #f otherwise."
(define (same-button? other-button)
(eq? button other-button))
(define (button-filter value signal)
(signal-constant value (signal-filter #f same-button? signal)))
(signal-merge (button-filter #f mouse-last-up)
(button-filter #t mouse-last-down)))
(register-event-handler
'mouse-motion
(lambda (e)
(signal-set! mouse-x (SDL:event:motion:x e))
(signal-set! mouse-y (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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