blob: 7eacefc757d9a63be3f33998a0c368c203764d4d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
;;; 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 keyboard)
#:use-module ((sdl sdl) #:prefix SDL:)
#:use-module (2d game)
#:use-module (2d signals)
#:use-module (2d vector2)
#:export (key-last-down
key-last-up
key-down?
key-directions
key-arrows
key-wasd))
(define key-last-down (make-signal))
(define key-last-up (make-signal))
(define (key-down? key)
"Create a signal for the state of KEY. Value is #t when key is
pressed and #f otherwise."
(make-signal
#:filter (lambda (value old from)
(eq? value key))
#:transformer (lambda (value old from)
(if (eq? from key-last-down) #t #f))
#:connectors (list key-last-down key-last-up)))
(define (key-directions up down left right)
(signal-lift4 (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 key-arrows (key-directions 'up 'down 'left 'right))
(define key-wasd (key-directions 'w 's 'a 'd))
(register-event-handler
'key-down
(lambda (e)
(signal-set! key-last-down (SDL:event:key:keysym:sym e))))
(register-event-handler
'key-up
(lambda (e)
(signal-set! key-last-up (SDL:event:key:keysym:sym e))))
|
