47 lines
1.5 KiB
Racket
47 lines
1.5 KiB
Racket
#lang racket
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(module drop-on-message racket
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(require 2htdp/universe 2htdp/image)
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(define (u)
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(universe 0
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(on-new (lambda (u w) (make-bundle (+ u 1) '() '())))
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(on-tick (lambda (w) (make-bundle w '() '())) 1 5)
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(on-msg (lambda (u w m) (make-bundle (- u 1) '() (list w))))
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(state #t)))
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(define (w n)
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(big-bang 3
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[to-draw (lambda (w) (overlay (text (number->string w) 22 'black) (circle 100 'solid 'red)))]
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[on-tick (lambda (w) (if (<= w 1) (make-package 0 n) (- w 1)))]
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[register LOCALHOST]
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[name n]))
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(launch-many-worlds (u) (w "one") (w "two")))
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(require (submod "." drop-on-message))
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(module drop-bad racket
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(require 2htdp/universe 2htdp/image)
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(define *world* #false)
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(define (u)
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(universe '()
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(on-new (lambda (u w) (make-bundle (cons w u) '() '())))
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(on-tick (lambda (w) w) 1 5)
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(on-msg (lambda (u w m)
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;; set *world* to the first world that comes around, reuse
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(unless *world* (set! *world* w))
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(make-bundle u '() (list *world*))))))
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(define (w n)
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(big-bang 3
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[to-draw (lambda (w) (overlay (text (number->string w) 22 'black) (circle 100 'solid 'red)))]
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[on-tick (lambda (w) (if (= w 1) (make-package 0 n) (- w 1)))]
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[register LOCALHOST]
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[name n]))
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(launch-many-worlds (u) (w "one") (w "two") (w "three")))
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; (require (submod "." drop-bad)) |