(let ((start 0) (paused 0) (state 'stopped))
(lambda (op)
(case op
- (('start-timer)
+ ((start-timer)
(set! start (SDL_GetTicks))
(set! state 'running))
- (('stop-timer)
+
+ ((stop-timer)
(set! state 'stopped))
- (('get-time)
+
+ ((get-time)
(cond ((eq? state 'stopped) 0)
((eq? state 'paused) paused)
(else (- (SDL_GetTicks) start))))
- (('pause-timer)
+
+ ((get-state)
+ state)
+
+ ((pause-timer)
(cond ((eq? state 'running)
(set! paused (- (SDL_GetTicks) start))
(set! state 'paused))))
- (('resume-timer)
+
+ ((resume-timer)
(cond ((eq? state 'paused)
(set! start (- (SDL_GetTicks) paused))
(set! state 'running))))))))
+
+(define (start-timer timer)
+ (timer 'start-timer))
+
+(define (stop-timer timer)
+ (timer 'stop-timer))
+
+(define (get-time timer)
+ (timer 'get-time))
+
+(define (get-state timer)
+ (timer 'get-state))
+
+(define (pause-timer timer)
+ (timer 'pause-timer))
+
+(define (resume-timer timer)
+ (timer 'resume-timer))