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