s2-tools/dist/dataStructures/uint64.js

A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.

import { S2Point, fromS2Point as fromS2, fromST } from '../geometry';
/**
 * Convert a BigInt to an Uint64Cell representation
 * @param id - the 64-bit cell id in BigInt or number form
 * @returns - an Uint64Cell with the appropriate id and functions
 */
export function toCell(id) {
    if (typeof id === 'object')
        return id;
    const bigint = BigInt(id);
    return {
        low: Number(bigint & 0xffffffffn),
        high: Number((bigint >> 32n) & 0xffffffffn),
    };
}
/**
 * Convert a lon/lat to an Uint64Cell representation
 * @param lon - longitude
 * @param lat - latitude
 * @returns - an Uint64Cell with the appropriate id and functions
 */
export function fromLonLat(lon, lat) {
    const { toST, fromLonLat } = S2Point;
    const [face, s, t] = toST(fromLonLat(lon, lat));
    return fromFaceST(face, s, t);
}
/**
 * Convert a face/s/t to an Uint64Cell representation
 * @param face - face on the sphere
 * @param s - x position
 * @param t - y position
 * @returns - an Uint64Cell with the appropriate id and functions
 */
export function fromFaceST(face, s, t) {
    const id = fromST(face, s, t);
    return toCell(id);
}
/**
 * @param point - a vector point on the sphere
 * @returns - an Uint64Cell with the appropriate id and functions
 */
export function fromS2Point(point) {
    const id = fromS2(point);
    return toCell(id);
}
/**
 * @param a - the first cell
 * @param b - the second cell
 * @returns -1 | 0 | 1
 */
export function compare(a, b) {
    if (a.high < b.high)
        return -1;
    if (a.high > b.high)
        return 1;
    if (a.low < b.low)
        return -1;
    if (a.low > b.low)
        return 1;
    return 0;
}
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