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;;; guile-2d
;;; 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 (2d mouse)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module (2d event)
#:use-module (2d signal)
#:use-module (2d vector)
#:export (mouse-move-hook
mouse-press-hook
mouse-click-hook
mouse-x
mouse-y
mouse-position
mouse-last-down
mouse-last-up
mouse-down?))
(define mouse-move-hook (make-hook 2))
(register-event-handler
'mouse-motion
(lambda (e)
(run-hook mouse-move-hook
(SDL:event:motion:x e)
(SDL:event:motion:y e))))
(define-signal mouse-position
(hook->signal mouse-move-hook
#(0 0)
(lambda (x y)
(vector x y))))
(define-signal mouse-x (signal-map vx mouse-position))
(define-signal mouse-y (signal-map vy mouse-position))
(define mouse-press-hook (make-hook 3))
(register-event-handler
'mouse-button-down
(lambda (e)
(run-hook mouse-press-hook
(SDL:event:button:button e)
(SDL:event:button:x e)
(SDL:event:button:y e))))
(define-signal mouse-last-down
(hook->signal mouse-press-hook
'none
(lambda (button x y)
button)))
(define mouse-click-hook (make-hook 3))
(register-event-handler
'mouse-button-up
(lambda (e)
(run-hook mouse-click-hook
(SDL:event:button:button e)
(SDL:event:button:x e)
(SDL:event:button:y e))))
(define-signal mouse-last-up
(hook->signal mouse-click-hook
'none
(lambda (button x y)
button)))
(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)))
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