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-rw-r--r--examples/rewrite-test.scm66
1 files changed, 43 insertions, 23 deletions
diff --git a/examples/rewrite-test.scm b/examples/rewrite-test.scm
index 54664ac..311e747 100644
--- a/examples/rewrite-test.scm
+++ b/examples/rewrite-test.scm
@@ -1,32 +1,52 @@
-(use-modules (2d game)
+(use-modules (srfi srfi-1)
+ (2d color)
+ (2d game)
(2d signals)
(2d sprite)
- (2d vector2))
+ (2d texture)
+ (2d time)
+ (2d vector2)
+ (2d window))
-(define sprite
- (delay (load-sprite "images/ghost.png"
- #:position (vector2 320 240))))
+(with-window (make-window #:title "FRP is cool"
+ #:resolution (vector2 640 480)
+ #:fullscreen? #f)
-(define quit-on-esc
- (signal-lift (lambda (down?)
- (when down?
- (quit-game)))
- (key-is-down 'escape)))
+ (define move
+ (make-signal
+ #:init (vector2 320 240)
+ #:transformer (lambda (value old from)
+ (if (eq? from arrows)
+ old
+ (v+ (vscale (signal-ref arrows) 5)
+ old)))
+ #:connectors (list arrows (time-every))))
-(define sprite-position
- (signal-lift (lambda (pos)
- (when (game-running?)
- (set-sprite-position! (force sprite) pos)))
- mouse-position))
+ (define ghost-texture (load-texture "images/ghost.png"))
-(define (draw)
- (draw-sprite (force sprite)))
+ (define sprite
+ (make-sprite ghost-texture
+ #:position move))
-;; TODO: make the quit condition a signal
+ (define follower-count 8)
+ (define followers
+ (list-tabulate
+ follower-count
+ (lambda (i)
+ (make-sprite ghost-texture
+ #:position (time-delay (* (- follower-count i) 1) move)
+ #:color (make-color 1 1 1 (/ (1+ i) 16))))))
-(define demo
- (make-game
- #:title "Simple Demo"
- #:draw draw))
+ ;; Temporary hack. There shouldn't be side effects like this in
+ ;; signals.
+ (define quit-on-esc
+ (signal-lift (lambda (down?)
+ (when down?
+ (quit-game)))
+ (key-down? 'escape)))
-(run-game demo)
+ (define (draw)
+ (for-each draw-sprite followers)
+ (draw-sprite sprite))
+
+ (run-game #:draw draw))