51 lines
1.5 KiB
Bash
51 lines
1.5 KiB
Bash
# List of abbreviated compass point labels
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compass_points=( 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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# List of angles to test
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test_angles=( 0.00 16.87 16.88 33.75 50.62 50.63 67.50
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84.37 84.38 101.25 118.12 118.13 135.00 151.87
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151.88 168.75 185.62 185.63 202.50 219.37 219.38
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236.25 253.12 253.13 270.00 286.87 286.88 303.75
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320.62 320.63 337.50 354.37 354.38 )
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capitalize() {
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printf '%s%s\n' "$(tr a-z A-Z <<<"${1:0:1}")" "${1:1}"
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}
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# convert compass point abbreviation to full text of label
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function expand_point {
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local label=$1
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set -- N north E east S south W west b " by "
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while (( $# )); do
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label=${label//$1/$2}
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shift 2
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done
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capitalize "$label"
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}
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# modulus function that returns 1..N instead of 0..N-1
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function amod {
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echo $(( ($1 - 1) % $2 + 1 ))
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}
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# convert a compass angle from degrees into a box index (1..32)
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function compass_point {
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# use bc or dc depending on what's on the system
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#amod $(dc <<<"$1 5.625 + 11.25 / 1 + p") 32
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amod $(bc <<<"($1 + 5.625) / 11.25 + 1") 32
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}
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# Now output the table of test data
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header_format="%-7s | %-18s | %s\n"
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row_format="%7.2f | %-18s | %2d\n"
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printf "$header_format" "Degrees" "Closest Point" "Index"
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for angle in ${test_angles[@]}; do
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let index=$(compass_point $angle)
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abbr=${compass_points[index-1]}
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label="$(expand_point $abbr)"
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printf "$row_format" $angle "$label" $index
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done
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