Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | 1x 1x 1x 6x 6x 6x 6x 6x 89x 1067x 1067x 89x 83x 83x 83x 6x 1x | /** ****************************************************************************************************
* File: geohashesWithinBBox.js
* Project: geohash
* @author Nick Soggin <iSkore@users.noreply.github.com> on 19-Feb-2019
*******************************************************************************************************/
'use strict';
const
getBBoxStartingPoint = require( './getBBoxStartingPoint' ),
neighbor = require( './neighbor' ),
{ ENCODE_AUTO } = require( './variables' );
/**
* geohashesWithinBBox
*
* Return all the geohashes between minLng, minLat, maxLng, maxLat at the specified precision
*
* @param {number} minLng - bbox min longitude
* @param {number} minLat - bbox min latitude
* @param {number} maxLng - bbox max longitude
* @param {number} maxLat - bbox max latitude
* @param {number} [precision=ENCODE_AUTO] - geohash precision
* @returns {Array} - geohash array
*/
function geohashesWithinBBox( minLng, minLat, maxLng, maxLat, precision = ENCODE_AUTO ) {
const
hashBBox = getBBoxStartingPoint( minLng, minLat, maxLng, maxLat, precision ),
hashList = [];
const originalHash = hashBBox.hashSouthWest;
hashList.push( originalHash );
for ( let lng = 0, lat = 0; lng <= hashBBox.lngStep; lng++ ) {
for ( ; lat < hashBBox.latStep; lat++ ) {
const northHash = neighbor( hashList[ hashList.length - 1 ], 'n' );
hashList.push( northHash );
}
if ( lng + lat !== hashBBox.lngStep + hashBBox.latStep ) {
const eastHash = neighbor( hashList[ hashList.length - 1 - lat ], 'e' );
lat = 0;
hashList.push( eastHash );
}
}
return hashList;
}
module.exports = geohashesWithinBBox;
|