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