blob: 5ff19794fd2cc6d6cd8041388c017ace57b26b0c (
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
72
73
74
75
76
77
78
79
80
81
82
|
(use-modules (srfi srfi-1)
(srfi srfi-9)
(2d color)
(2d game)
(2d keyboard)
(2d math)
(2d rect)
(2d signals)
(2d sprite)
(2d texture)
(2d time)
(2d vector2)
(2d window))
(define-record-type <paddle>
(%make-paddle y)
paddle?
(y paddle-y)
(speed paddle-speed))
(define-record-type <ball>
(make-ball position velocity)
ball?
(position ball-position)
(velocity ball-velocity))
(define window-width 640)
(define window-height 480)
(define half-width (/ window-width 2))
(define half-height (/ window-height 2))
(with-window (make-window #:title "FRP is cool"
#:resolution (vector2 window-width
window-height)
#:fullscreen? #f)
(define paddle-texture (load-texture "images/paddleBlue.png"))
(define ball-texture (load-texture "images/ballBlue.png"))
(define paddle-speed 5)
(define ball-speed 4)
(define ball-hitbox (make-rect -8 -8 16 16))
(define (move-paddle directions)
(signal-fold (lambda (new old)
(clamp 0 window-height (+ (* new paddle-speed) old)))
half-height
(signal-lift vy (time-every directions))))
(define player1-paddle (move-paddle key-wasd))
(define player2-paddle (move-paddle key-arrows))
(define (wall-bounce position)
(let ((rect (rect-move ball-hitbox position)))
(cond ((> (rect-bottom rect) window-height)
(vector2 (vx position)
(- (vy position))))
(else
position))))
(define ball (signal-fold (lambda (direction position)
(wall-bounce (v+ (vscale direction ball-speed) position)))
(vector2 half-width half-height)
(time-every (make-signal #:init (vector2 1 1)))))
(define quit-on-esc
(signal-lift (lambda (down?)
(when down?
(quit-game)))
(key-down? 'escape)))
(define draw
(let ((paddle-sprite (make-sprite paddle-texture))
(ball-sprite (make-sprite ball-texture)))
(lambda ()
(set-sprite-position! paddle-sprite (vector2 0 (signal-ref player1-paddle)))
(draw-sprite paddle-sprite)
(set-sprite-position! paddle-sprite (vector2 window-width (signal-ref player2-paddle)))
(draw-sprite paddle-sprite)
(set-sprite-position! ball-sprite ball)
(draw-sprite ball-sprite))))
(run-game #:draw draw))
|
