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4dd0370ec1
* migra for distance * adding distance calculator * adding ability to store home address * improve distance calculation * calculating distance * show distance in grid view * upgrading dependencies * moving to react 19 * ability to clone a job * fixing tests * polishing
36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
/*
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* Copyright (c) 2026 by Christian Kellner.
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* Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
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*/
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const R = 6371000; // Earth radius in meters
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/**
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* Calculate the great-circle distance between two points on Earth using the Haversine formula.
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* This is to calculate the distance between the listing address & the address provided by the user. I know, it is only
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* a rough estimation as this calculates the distance as a straight line, but it's more convenient than using an external
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* service and still gives a good approximation for sorting purposes.
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* Returns distance in meters.
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*
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* @param {number} lat1
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* @param {number} lon1
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* @param {number} lat2
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* @param {number} lon2
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* @returns {number}
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*/
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export function distanceMeters(lat1, lon1, lat2, lon2) {
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const toRad = (deg) => (deg * Math.PI) / 180;
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const phi1 = toRad(lat1);
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const phi2 = toRad(lat2);
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const dPhi = toRad(lat2 - lat1);
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const dLambda = toRad(lon2 - lon1);
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const a =
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Math.sin(dPhi / 2) * Math.sin(dPhi / 2) +
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Math.cos(phi1) * Math.cos(phi2) * Math.sin(dLambda / 2) * Math.sin(dLambda / 2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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return Math.round(R * c * 10) / 10;
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}
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