The version of Syndicate current at the conclusion of Tony Garnock-Jones's PhD research, end-of-2017/start-of-2018.
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#lang syndicate
;; Compare to "ezd" clock-face example from: J. F. Bartlett, “Don’t
;; Fidget with Widgets, Draw!,” Palo Alto, California, DEC WRL
;; Research Report 91/6, May 1991.
(require lang/posn)
(require 2htdp/image)
(require (only-in racket/math pi))
(require racket/date)
(require "../2d.rkt")
(define hand
(polygon (list (make-posn 0 0)
(make-posn 30 10)
(make-posn 100 0)
(make-posn 30 -10))
"solid"
"black"))
(define (fmod a b)
(- a (* b (truncate (/ a b)))))
(define (hand-sprite id layer angle-field length)
(sprite #:id id layer `((translate 100 100)
(rotate ,(fmod (- 90 (angle-field)) 360))
(scale ,length ,(/ length 5))
(translate 0 -0.5)
(touchable ,id ,in-unit-square?)
(texture ,hand))))
(define (text-sprite layer x y content)
(define i (text content 24 "green"))
(simple-sprite layer x y (image-width i) (image-height i) i))
(spawn (field [minute-angle 0]
[hour-angle 0]
[start-time (current-inexact-milliseconds)]
[elapsed-seconds 0]
[displacement (let ((now (current-date)))
(* 6 (+ (* 60 (date-hour now))
(date-minute now))))])
(assert (outbound (simple-sprite 10 0 0 200 200 (circle 100 "solid" "blue"))))
(assert (outbound (hand-sprite 'minute 9 minute-angle 95)))
(assert (outbound (text-sprite 8 40 40 "time")))
(assert (outbound (text-sprite 8 110 80 "drifts")))
(assert (outbound (text-sprite 8 40 120 "by")))
(assert (outbound (hand-sprite 'hour 7 hour-angle 65)))
(assert (outbound (simple-sprite 6 95 95 10 10 (circle 5 "solid" "black"))))
(define (respond-to-drags id scale)
(define/query-value touching? #f (inbound (touching id)) #t)
(on #:when (touching?) (message
(inbound (mouse-event 'left-down (mouse-state $mx $my _ _ _))))
(start-time #f)
(elapsed-seconds 0)
(update-displacement! mx my scale)
(react (stop-when (message (inbound (mouse-event 'left-up _))))
(stop-when (message (inbound (mouse-event 'leave _))))
(on-stop (start-time (current-inexact-milliseconds)))
(on (message (inbound (mouse-event 'motion (mouse-state $mx $my _ _ _))))
(update-displacement! mx my scale)))))
(define (update-displacement! mx my scale)
(define angle (- 90 (* (/ 180 pi) (atan (- 100 my) (- mx 100)))))
(define delta0 (fmod (- (* scale angle) (displacement)) 360))
(define delta (if (<= delta0 -180) (+ delta0 360) delta0))
(displacement (+ (displacement) delta)))
(respond-to-drags 'minute 1)
(respond-to-drags 'hour 12)
(begin/dataflow
(define angle (+ (/ (elapsed-seconds) 1000 10) (displacement)))
(minute-angle angle)
(hour-angle (/ angle 12)))
(on (message (inbound (frame-event _ _ _ _)))
(when (start-time)
(elapsed-seconds (- (current-inexact-milliseconds) (start-time)))))
(on (message (inbound (key-event #\q #t _)))
(assert! (outbound 'stop))))
(module+ main (current-ground-dataspace (2d-dataspace #:label "Syndicate Clock"
#:width 200
#:height 200)))