diff options
| -rw-r--r-- | examples/rewrite-test.scm | 66 |
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)) |