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
;; Multiple animated sprites.
;;
;; 2016-12-12 With the current implementations of (a) Syndicate's
;; dataspaces and (b) Syndicate's 2D sprite support, my reasonably new
;; 2.6GHz laptop can animate 20 logos at 256x256 pixels at about 20
;; frames per second on a single core.
;;
;; For comparison, Kay recounts in "The Early History of Smalltalk"
;; (1993) that "by the Fall of '73 [Steve Purcell] could demo 80
;; ping-pong balls and 10 flying horses running at 10 frames per
;; second in 2 1/2 D" in an early Smalltalk (?) on a NOVA.
(require 2htdp/image)
(require images/logos)
(require "../2d.rkt")
(define speed-limit 40)
(define sprite-count 20)
(define (spawn-background)
(spawn
(during (inbound (window $width $height))
(assert (outbound
(scene (seal `((push-matrix (scale ,width ,height)
(texture ,(rectangle 1 1 "solid" "white")))))
(seal `())))))))
(define i:logo (plt-logo))
(define (spawn-logo)
(spawn (field [x 100] [y 100])
(field [dx (* (- (random) 0.5) speed-limit)]
[dy (* (- (random) 0.5) speed-limit)])
(define/query-value w #f (inbound ($ w (window _ _))) w)
(assert (outbound (simple-sprite 0
(x)
(y)
(image-width i:logo)
(image-height i:logo)
i:logo)))
(define (bounce f df limit)
(define v (f))
(define limit* (- limit (image-width i:logo)))
(cond [(< v 0) (f 0) (df (abs (df)))]
[(> v limit*) (f limit*) (df (- (abs (df))))]
[else (void)]))
(on (message (inbound (frame-event _ _ _ _)))
(when (w) ;; don't animate until we know the window bounds
(x (+ (x) (dx)))
(y (+ (y) (dy)))
(bounce x dx (window-width (w)))
(bounce y dy (window-height (w)))))))
(spawn-background)
(for [(i sprite-count)]
(spawn-logo))
(spawn (on (message (inbound (frame-event $counter $timestamp _ _)))
(when (and (zero? (modulo counter 100)) (positive? timestamp))
(log-info "~v frames, ~v ms ==> ~v Hz"
counter
timestamp
(/ counter (/ timestamp 1000.0))))))
(spawn* (assert! (outbound 'fullscreen))
(until (message (inbound (key-event #\q #t _))))
(assert! (outbound 'stop)))
(module+ main (current-ground-dataspace (2d-dataspace)))