mirror of https://github.com/gchq/CyberChef.git
60 lines
1.7 KiB
JavaScript
60 lines
1.7 KiB
JavaScript
/**
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* @author Dachande663 [dachande663@gmail.com]
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* @copyright Crown Copyright 2018
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* HaversineDistance operation
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*/
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class HaversineDistance extends Operation {
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/**
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* HaversineDistance constructor
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*/
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constructor() {
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super();
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this.name = "Haversine distance";
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this.module = "Default";
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this.description = "Returns the distance between two pairs of GPS latitude and longitude co-ordinates in metres.<br><br>e.g. <code>51.487263,-0.124323, 38.9517,-77.1467</code>";
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this.infoURL = "https://wikipedia.org/wiki/Haversine_formula";
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this.inputType = "string";
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this.outputType = "number";
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this.args = [];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {number}
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*/
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run(input, args) {
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const values = input.match(/^(-?\d+(\.\d+)?), ?(-?\d+(\.\d+)?), ?(-?\d+(\.\d+)?), ?(-?\d+(\.\d+)?)$/);
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if (!values) {
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throw new OperationError("Input must in the format lat1, lng1, lat2, lng2");
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}
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const lat1 = parseFloat(values[1]);
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const lng1 = parseFloat(values[3]);
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const lat2 = parseFloat(values[5]);
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const lng2 = parseFloat(values[7]);
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const TO_RAD = Math.PI / 180;
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const dLat = (lat2-lat1) * TO_RAD;
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const dLng = (lng2-lng1) * TO_RAD;
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const a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(lat1 * TO_RAD) * Math.cos(lat2 * TO_RAD) * Math.sin(dLng/2) * Math.sin(dLng/2);
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const metres = 6371000 * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
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return metres;
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}
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}
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export default HaversineDistance;
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