mirror of
https://github.com/spacebarchat/server.git
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BrajamohanDas-afk
32 lines
1.3 KiB
TypeScript
32 lines
1.3 KiB
TypeScript
/*
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Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
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Copyright (C) 2023 Spacebar and Spacebar Contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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type Location = { latitude: number; longitude: number };
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export function distanceBetweenLocations(loc1: Location, loc2: Location): number {
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return distanceBetweenCoords(loc1.latitude, loc1.longitude, loc2.latitude, loc2.longitude);
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}
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//Haversine function
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function distanceBetweenCoords(lat1: number, lon1: number, lat2: number, lon2: number) {
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const p = 0.017453292519943295; // Math.PI / 180
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const c = Math.cos;
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const a = 0.5 - c((lat2 - lat1) * p) / 2 + (c(lat1 * p) * c(lat2 * p) * (1 - c((lon2 - lon1) * p))) / 2;
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return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
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}
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