Created
November 3, 2012 15:47
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| #lang racket | |
| (define (degree->cardinal degree) | |
| (case (modulo (inexact->exact (round (* 32 (/ degree 360)))) 32) | |
| ((0) "N") | |
| ((1) "NbE") | |
| ((2) "NNE") | |
| ((3) "NEbN") | |
| ((4) "NE") | |
| ((5) "NEbE") | |
| ((6) "ENE") | |
| ((7) "EbN") | |
| ((8) "E") | |
| ((9) "EbS") | |
| ((10) "ESE") | |
| ((11) "SEbE") | |
| ((12) "SE") | |
| ((13) "SEbS") | |
| ((14) "SSE") | |
| ((15) "SbE") | |
| ((16) "S") | |
| ((17) "SbW") | |
| ((18) "SSW") | |
| ((19) "SWbS") | |
| ((20) "SW") | |
| ((21) "SWbW") | |
| ((22) "WSW") | |
| ((23) "WbS") | |
| ((24) "W") | |
| ((25) "WbN") | |
| ((26) "WNW") | |
| ((27) "NWbW") | |
| ((28) "NW") | |
| ((29) "NWbN") | |
| ((30) "NNW") | |
| ((31) "NbW") | |
| (else "unknwown"))) | |
| (define (cardinal->degree card) | |
| (/ (* 360 (case card | |
| (("N") 0) | |
| (("NbE") 1) | |
| (("NNE") 2) | |
| (("NEbN") 3) | |
| (("NE") 4) | |
| (("NEbE") 5) | |
| (("ENE") 6) | |
| (("EbN") 7) | |
| (("E") 8) | |
| (("EbS") 9) | |
| (("ESE") 10) | |
| (("SEbE") 11) | |
| (("SE") 12) | |
| (("SEbS") 13) | |
| (("SSE") 14) | |
| (("SbE") 15) | |
| (("S") 16) | |
| (("SbW") 17) | |
| (("SSW") 18) | |
| (("SWbS") 19) | |
| (("SW") 20) | |
| (("SWbW") 21) | |
| (("WSW") 22) | |
| (("WbS") 23) | |
| (("W") 24) | |
| (("WbN") 25) | |
| (("WNW") 26) | |
| (("NWbW") 27) | |
| (("NW") 28) | |
| (("NWbN") 29) | |
| (("NNW") 30) | |
| (("NbW") 31) | |
| (else -1))) 32)) |
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