sierpinski.rkt

#reader(lib"read.ss""wxme")WXME0108 ## 
#|
   This file uses the GRacket editor format.
   Open this file in DrRacket version 6.7 or later to read it.

   Most likely, it was created by saving a program in DrRacket,
   and it probably contains a program with non-text elements
   (such as images or comment boxes).

            http://racket-lang.org/
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0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 7 #"      ("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 2 #"ca"
0 0 24 3 2 #" ("
0 0 14 3 9 #"mid-point"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 1 #"("
0 0 14 3 3 #"and"
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 3 #"  ("
0 0 14 3 13 #"draw-triangle"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #")"
0 1 24 65 1 #"\t"
0 0 24 3 4 #"    "
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 3 #"  ("
0 0 14 3 10 #"sierpinski"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 2 #"ab"
0 0 24 3 1 #" "
0 0 14 3 2 #"ca"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 3 #"  ("
0 0 14 3 10 #"sierpinski"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 14 3 2 #"ab"
0 0 24 3 1 #" "
0 0 14 3 2 #"bc"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 1 24 65 1 #"\t"
0 0 24 3 3 #"  ("
0 0 14 3 10 #"sierpinski"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #" "
0 0 14 3 2 #"ca"
0 0 24 3 1 #" "
0 0 14 3 2 #"bc"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 15 #"          ))]))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 43 #";; draw-triangle : posn posn posn  ->  true"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 13 #"draw-triangle"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 3 #"and"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"   ("
0 0 14 3 15 #"draw-solid-line"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"black"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"   ("
0 0 14 3 15 #"draw-solid-line"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"black"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"   ("
0 0 14 3 15 #"draw-solid-line"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"black"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 40 #";; too-small? : posn posn posn  ->  bool"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 10 #"too-small?"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 1 #" "
0 0 14 3 1 #"b"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 2 #"<="
0 0 24 3 2 #" ("
0 0 14 3 1 #"+"
0 0 24 3 2 #" ("
0 0 14 3 3 #"sqr"
0 0 24 3 2 #" ("
0 0 14 3 1 #"-"
0 0 24 3 2 #" ("
0 0 14 3 6 #"posn-x"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 3 #") ("
0 0 14 3 6 #"posn-x"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 5 #"))) ("
0 0 14 3 3 #"sqr"
0 0 24 3 2 #" ("
0 0 14 3 1 #"-"
0 0 24 3 2 #" ("
0 0 14 3 6 #"posn-y"
0 0 24 3 1 #" "
0 0 14 3 1 #"a"
0 0 24 3 3 #") ("
0 0 14 3 6 #"posn-y"
0 0 24 3 1 #" "
0 0 14 3 1 #"c"
0 0 24 3 5 #")))) "
0 0 21 3 2 #"10"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 34 #";; mid-point : posn posn  ->  posn"
0 0 24 29 1 #"\n"
0 0 17 3 53 #";; to compute the mid-point between a-posn and b-posn"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 9 #"mid-point"
0 0 24 3 1 #" "
0 0 14 3 6 #"a-posn"
0 0 24 3 1 #" "
0 0 14 3 6 #"b-posn"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 9 #"make-posn"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ("
0 0 14 3 3 #"mid"
0 0 24 3 2 #" ("
0 0 14 3 6 #"posn-x"
0 0 24 3 1 #" "
0 0 14 3 6 #"a-posn"
0 0 24 3 3 #") ("
0 0 14 3 6 #"posn-x"
0 0 24 3 1 #" "
0 0 14 3 6 #"b-posn"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ("
0 0 14 3 3 #"mid"
0 0 24 3 2 #" ("
0 0 14 3 6 #"posn-y"
0 0 24 3 1 #" "
0 0 14 3 6 #"a-posn"
0 0 24 3 3 #") ("
0 0 14 3 6 #"posn-y"
0 0 24 3 1 #" "
0 0 14 3 6 #"b-posn"
0 0 24 3 4 #"))))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 34 #";; mid : number number  ->  number"
0 0 24 29 1 #"\n"
0 0 17 3 36 #";; to compute the average of x and y"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 3 #"mid"
0 0 24 3 1 #" "
0 0 14 3 1 #"x"
0 0 24 3 1 #" "
0 0 14 3 1 #"y"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 1 #"/"
0 0 24 3 2 #" ("
0 0 14 3 1 #"+"
0 0 24 3 1 #" "
0 0 14 3 1 #"x"
0 0 24 3 1 #" "
0 0 14 3 1 #"y"
0 0 24 3 2 #") "
0 0 21 3 1 #"2"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 9 #";; Tests:"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 1 #"A"
0 0 24 3 2 #" ("
0 0 14 3 9 #"make-posn"
0 0 24 3 1 #" "
0 0 21 3 3 #"200"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 1 #"B"
0 0 24 3 2 #" ("
0 0 14 3 9 #"make-posn"
0 0 24 3 1 #" "
0 0 21 3 2 #"27"
0 0 24 3 1 #" "
0 0 21 3 3 #"300"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 1 #"C"
0 0 24 3 2 #" ("
0 0 14 3 9 #"make-posn"
0 0 24 3 1 #" "
0 0 21 3 3 #"373"
0 0 24 3 1 #" "
0 0 21 3 3 #"300"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 2 #"  "
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 5 #"start"
0 0 24 3 1 #" "
0 0 21 3 3 #"400"
0 0 24 3 1 #" "
0 0 21 3 3 #"400"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 10 #"sierpinski"
0 0 24 3 1 #" "
0 0 14 3 1 #"A"
0 0 24 3 1 #" "
0 0 14 3 1 #"B"
0 0 24 3 1 #" "
0 0 14 3 1 #"C"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 17 #"sleep-for-a-while"
0 0 24 3 1 #" "
0 0 21 3 1 #"3"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 4 #"stop"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 27 #";; circles: number -> Image"
0 0 24 29 1 #"\n"
0 9         337 79           0 0           0 55 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 8 #"fcircles"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 4 #"cond"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 2 #"<="
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"5"
0 0 24 3 3 #") ("
0 0 14 3 6 #"circle"
0 0 24 3 1 #" "
0 0 21 3 1 #"5"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"solid"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 3 #"red"
0 0 24 3 2 #")]"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ["
0 0 14 3 4 #"else"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"     "
0 0 14 3 3 #"..."
0 0 24 3 1 #"("
0 0 14 3 8 #"fcircles"
0 0 24 3 2 #" ("
0 0 14 3 1 #"/"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"     "
0 0 14 3 3 #"..."
0 0 24 3 1 #"("
0 0 14 3 8 #"fcircles"
0 0 24 3 2 #" ("
0 0 14 3 1 #"/"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 6 #")) ]))"
0           0 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 9 #"fcircleso"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 4 #"cond"
0 0 24 3 1 #" "
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    (("
0 0 14 3 2 #"<="
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"4"
0 0 24 3 3 #") ("
0 0 14 3 6 #"circle"
0 0 24 3 1 #" "
0 0 21 3 1 #"4"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 7 #"outline"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"black"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ("
0 0 14 3 4 #"else"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"     ("
0 0 15 3 5 #"local"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"       (("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 3 #"sub"
0 0 24 3 2 #" ("
0 0 14 3 9 #"fcircleso"
0 0 24 3 2 #" ("
0 0 14 3 1 #"/"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 4 #"))))"
0 0 24 29 1 #"\n"
0 0 24 3 8 #"       ("
0 0 14 3 10 #"overlay/xy"
0 0 24 3 1 #" "
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 6 #"circle"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 7 #"outline"
0 0 24 3 1 #" "
0 0 21 3 1 #"'"
0 0 14 3 5 #"black"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 1 #"*"
0 0 24 3 1 #" "
0 0 21 3 1 #"3"
0 0 24 3 2 #" ("
0 0 14 3 1 #"/"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 1 #" "
0 0 21 3 2 #"-2"
0 0 24 3 3 #")) "
0 0 21 3 1 #"0"
0 0 24 3 1 #" "
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 10 #"overlay/xy"
0 0 24 3 1 #" "
0 0 24 29 1 #"\n"
0 0 24 3 9 #"         "
0 0 14 3 3 #"sub"
0 0 24 29 1 #"\n"
0 0 24 3 10 #"         ("
0 0 14 3 1 #"*"
0 0 24 3 1 #" "
0 0 21 3 1 #"3"
0 0 24 3 1 #" "
0 0 14 3 1 #"n"
0 0 24 3 2 #") "
0 0 21 3 1 #"0"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"         "
0 0 14 3 3 #"sub"
0 0 24 3 6 #"))))))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 9 #"fcircleso"
0 0 24 3 1 #" "
0 0 21 3 3 #"100"
0 0 24 3 1 #")"
0           0