27 lines
833 B
Clojure
27 lines
833 B
Clojure
(ns boxing-the-compass
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(:use [clojure.string :only [capitalize]]))
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(def headings
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(for [i (range 0 (inc 32))]
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(let [heading (* i 11.25)]
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(case (mod i 3)
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1 (+ heading 5.62)
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2 (- heading 5.62)
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heading))))
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(defn angle2compass
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[angle]
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(let [dirs ["N" "NbE" "N-NE" "NEbN" "NE" "NEbE" "E-NE" "EbN"
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"E" "EbS" "E-SE" "SEbE" "SE" "SEbS" "S-SE" "SbE"
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"S" "SbW" "S-SW" "SWbS" "SW" "SWbW" "W-SW" "WbS"
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"W" "WbN" "W-NW" "NWbW" "NW" "NWbN" "N-NW" "NbW"]
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unpack {\N "north" \E "east" \W "west" \S "south" \b " by " \- "-"}
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sep (/ 360 (count dirs))
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dir (int (/ (mod (+ angle (/ sep 2)) 360) sep))]
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(capitalize (apply str (map unpack (dirs dir))))))
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(print
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(apply str (map-indexed #(format "%2s %-18s %7.2f\n"
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(inc (mod %1 32)) (angle2compass %2) %2)
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headings)))
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