KarlComSe / SvenskaElsparkcyklarAB

import * as turf from '@turf/turf';

export function getDistance(lat1: number, lon1: number, lat2: number, lon2: number) {

  const from = turf.point([lon1, lat1]);

  const to = turf.point([lon2, lat2]);

  return turf.distance(from, to) * 1000;

}

export function positionInsidePolygon(

  lat: number,

  lon: number,

  polygon: { lat: number; lng: number }[],

): boolean {

  const point = {

    type: 'Feature' as const,

    properties: {},

    geometry: {

      type: 'Point' as const,

      coordinates: [lon, lat],

    },

  };

  const poly = {

    type: 'Feature' as const,

    properties: {},

    geometry: {

      type: 'Polygon' as const,

      coordinates: [polygon.map((p) => [p.lng, p.lat])],

    },

  };

  return turf.booleanPointInPolygon(point, poly);

}