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useDistance - Hook to simplify distance measurement (Geo)
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| import { useMemo } from 'react' | |
| type GeoLocation = { | |
| latitude: number | |
| longitude: number | |
| } | |
| export const useDistance = (pointA?: GeoLocation, pointB?: GeoLocation) => | |
| useMemo(() => { | |
| const isValid = x => x != null && isFinite(x) | |
| if ( | |
| !( | |
| isValid(pointA?.latitude) && | |
| isValid(pointA?.longitude) && | |
| isValid(pointB?.latitude) && | |
| isValid(pointB?.longitude) | |
| ) | |
| ) { | |
| return null | |
| } | |
| const deg2rad = (deg: number) => deg * (Math.PI / 180) | |
| const kmToMiles = (km: number) => km / 1.609344 | |
| const latA = pointA?.latitude ?? 0 | |
| const lonA = pointA?.longitude ?? 0 | |
| const latB = pointB?.latitude ?? 0 | |
| const lonB = pointB?.longitude ?? 0 | |
| const equatorialRadius = 6371 // Radius of the earth in km | |
| const dLat = deg2rad(latB - latA) // deg2rad below | |
| const dLon = deg2rad(lonB - lonA) | |
| const a = | |
| Math.sin(dLat / 2) * Math.sin(dLat / 2) + | |
| Math.cos(deg2rad(latA)) * Math.cos(deg2rad(latB)) * Math.sin(dLon / 2) * Math.sin(dLon / 2) | |
| const angle = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)) | |
| const distanceKm = equatorialRadius * angle // Distance in km | |
| return kmToMiles(distanceKm) | |
| }, [pointA?.latitude, pointA?.longitude, pointB?.latitude, pointB?.longitude]) |
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