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20 lines
365 B
JavaScript
20 lines
365 B
JavaScript
var adjust_lon = require('./adjust_lon');
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module.exports = function(zone, lon) {
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if (zone === undefined) {
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zone = Math.floor((adjust_lon(lon) + Math.PI) * 30 / Math.PI);
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if (zone < 0) {
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return 0;
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} else if (zone >= 60) {
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return 59;
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}
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return zone;
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} else {
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if (zone > 0 && zone <= 60) {
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return zone - 1;
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}
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}
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};
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