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Merge pull request #298 from taisukef/DNCL3
add DNCL3
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| function encode(lat, lng, level) { | ||
| res = "E" | ||
| if lng < 0 { | ||
| res = "W" | ||
| lng = lng + 180 | ||
| } | ||
| lat = lat + 90 # 180:the North Pole, 0:the South Pole | ||
| unit = 180 | ||
| for i = 1 to level - 1 { | ||
| unit = unit / 3 | ||
| x = lng // unit | ||
| y = lat // unit | ||
| res = res + (x + y * 3 + 1) | ||
| lng = lng - x * unit | ||
| lat = lat - y * unit | ||
| } | ||
| return res | ||
| } | ||
|
|
||
| function char2n(c) { | ||
| if c == "0" { | ||
| return 0 | ||
| } else if c == "1" { | ||
| return 1 | ||
| } else if c == "2" { | ||
| return 2 | ||
| } else if c == "3" { | ||
| return 3 | ||
| } else if c == "4" { | ||
| return 4 | ||
| } else if c == "5" { | ||
| return 5 | ||
| } else if c == "6" { | ||
| return 6 | ||
| } else if c == "7" { | ||
| return 7 | ||
| } else if c == "8" { | ||
| return 8 | ||
| } else if c == "9" { | ||
| return 9 | ||
| } | ||
| return -1 | ||
| } | ||
|
|
||
| function decode(code) { | ||
| flg = 0 | ||
| if code[0] == "W" { | ||
| flg = 1 | ||
| } | ||
| unit = 180 | ||
| lat = 0 | ||
| lng = 0 | ||
| level = 1 | ||
| while 1 { | ||
| n = char2n(code[level]) | ||
| if n <= 0 { | ||
| break | ||
| } | ||
| unit = unit / 3 | ||
| n = n - 1 | ||
| lng = lng + n % 3 * unit | ||
| lat = lat + n // 3 * unit | ||
| level = level + 1 | ||
| } | ||
| lat = lat + unit / 2 | ||
| lng = lng + unit / 2 | ||
| lat = lat - 90 | ||
| if flg { | ||
| lng = lng - 180 | ||
| } | ||
| return [lat, lng, level, unit] | ||
| } | ||
|
|
||
| print encode(35.65858, 139.745433, 14) | ||
| print decode("E9139659937288") |
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