37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
// utils/geometryUtils.js
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/**
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* Parses a point string in the format "POINT (longitude latitude)" and returns an object with latitude and longitude as numbers.
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* @param {string} position - The position string in the format "POINT (longitude latitude)".
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* @returns {{latitude: number, longitude: number}} An object containing the latitude and longitude as numbers.
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*/
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export const parsePoint = (position) => {
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const [longitude, latitude] = position.slice(6, -1).split(" ");
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return { latitude: parseFloat(latitude), longitude: parseFloat(longitude) };
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};
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/**
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* Finds the closest points on a polyline to a new point.
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* @param {Array} coordinates - The coordinates of the polyline.
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* @param {Object} newPoint - The new point (with latitude and longitude).
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* @param {Object} map - The map object.
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* @returns {Array} The closest pair of points on the polyline.
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*/
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export const findClosestPoints = (coordinates, newPoint, map) => {
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if (!map) {
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console.error("Map is not defined. Cannot find closest points.");
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return [];
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}
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let minDist = Infinity;
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let closestPair = [];
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for (let i = 1; i < coordinates.length; i++) {
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const dist = L.LineUtil.pointToSegmentDistance(map.latLngToLayerPoint(newPoint), map.latLngToLayerPoint(coordinates[i - 1]), map.latLngToLayerPoint(coordinates[i]));
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if (dist < minDist) {
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minDist = dist;
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closestPair = [coordinates[i - 1], coordinates[i], i];
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}
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}
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return closestPair;
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};
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