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Added the Haversine distance algoritm #430

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Merged
josecarlosweb merged 1 commit into from
Oct 25, 2020
Merged

Added the Haversine distance algoritm #430

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32 changes: 32 additions & 0 deletions Navigation/Haversine.js
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/*
Calculate the distance between two coordinates using the haversine formula
More about: https://pt.wikipedia.org/wiki/F%C3%B3rmula_de_Haversine
@Param {number} latitude1
@Param {number} latitude2
@Param {number} longitude1
@Param {number} longitude2
*/
const haversineDistance = (latitude1 = 0, longitude1 = 0, latitude2 = 0, longitude2 = 0) => {
validateLatOrLong(latitude1)
validateLatOrLong(latitude2)
validateLatOrLong(longitude1)
validateLatOrLong(longitude2)
const earthRadius = 6371e3 // 6,371km
const pi = Math.PI
const cos1 = latitude1 * pi / 180.0
const cos2 = latitude2 * pi / 180.0
const deltaLatitude = (latitude2 - latitude1) * pi / 180.0
const deltaLongitude = (longitude2 - longitude1) * pi / 180.0

const alpha = Math.sin(deltaLatitude / 2) * Math.sin(deltaLatitude / 2) + Math.cos(cos1) * Math.cos(cos2) * Math.sin(deltaLongitude / 2) * Math.sin(deltaLongitude / 2)
const constant = 2 * Math.atan2(Math.sqrt(alpha), Math.sqrt(1 - alpha))
return earthRadius * constant
}

const validateLatOrLong = value => {
if (typeof value !== 'number') {
throw new TypeError('The value of latitude or longitude should be a number')
}
}

export { haversineDistance }
11 changes: 11 additions & 0 deletions Navigation/Haversine.test.js
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import { haversineDistance } from './Haversine'

describe('Testing the haversine distance calculator', () => {
it('Calculate distance', () => {
const distance = haversineDistance(64.1265, -21.8174, 40.7128, -74.0060)
expect(distance).toBe(4208198.758424171)
})
it('Test validation, expect throw', () => {
expect(() => haversineDistance(64.1265, -21.8174, 40.7128, '74.0060')).toThrow()
})
})
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