mirror of
https://github.com/proj4js/proj4js.git
synced 2026-01-18 16:13:22 +00:00
19 lines
358 B
JavaScript
19 lines
358 B
JavaScript
import adjust_lon from './adjust_lon';
|
|
|
|
export default function(zone, lon) {
|
|
if (zone === undefined) {
|
|
zone = Math.floor((adjust_lon(lon) + Math.PI) * 30 / Math.PI);
|
|
|
|
if (zone < 0) {
|
|
return 0;
|
|
} else if (zone >= 60) {
|
|
return 59;
|
|
}
|
|
return zone;
|
|
} else {
|
|
if (zone > 0 && zone <= 60) {
|
|
return zone - 1;
|
|
}
|
|
}
|
|
}
|