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[gacela.git] / src / gacela_widgets.scm

diff --git a/src/gacela_widgets.scm b/src/gacela_widgets.scm
index 04f2dcb2a3088c7965ed2c8c236e12e02fd0f085..fedc56338bc3b62e993cba76839896d69b742d31 100755 (executable)
--- a/src/gacela_widgets.scm
+++ b/src/gacela_widgets.scm
@@ -18,26 +18,23 @@
 ;;; Timers
 
 (define (make-timer)
-  '((start . 0) (paused . 0) (state . stopped)))
-
-(define (start-timer timer)
-  (assoc-set! timer 'start (SDL_GetTicks))
-  (assoc-set! timer state 'running))
-
-(define (stop-timer timer)
-  (assoc-set! timer 'state 'stopped))
-
-(define (get-time timer)
-  (cond ((eq? (assoc 'state timer) 'stopped) 0)
-        ((eq? (assoc 'state timer) 'paused) (assoc 'paused timer))
-        (else (- (SDL_GetTicks) (assoc 'start timer)))))
-
-(define (pause-timer timer)
-  (cond ((eq? (assoc 'state timer) 'running)
-         (assoc-set! timer 'paused (- (SDL_GetTicks) (assoc 'start timer)))
-         (assoc-set! timer 'state 'paused))))
-
-(define (resume-timer timer)
-  (cond ((eq? (assoc 'state timer) 'paused)
-         (assoc-set! timer 'start (- (SDL_GetTicks) (assoc 'paused timer)))
-         (assoc-set! timer 'state 'running))))
+  (let ((start 0) (paused 0) (state 'stopped))
+    (lambda (op)
+      (case op
+       (('start-timer)
+        (set! start (SDL_GetTicks))
+        (set! state 'running))
+       (('stop-timer)
+        (set! state 'stopped))
+       (('get-time)
+        (cond ((eq? state 'stopped) 0)
+              ((eq? state 'paused) paused)
+              (else (- (SDL_GetTicks) start))))
+       (('pause-timer)
+        (cond ((eq? state 'running)
+               (set! paused (- (SDL_GetTicks) start))
+               (set! state 'paused))))
+       (('resume-timer)
+        (cond ((eq? state 'paused)
+               (set! start (- (SDL_GetTicks) paused))
+               (set! state 'running))))))))