55 lines
2.0 KiB
JavaScript
Executable File
55 lines
2.0 KiB
JavaScript
Executable File
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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var clone_1 = __importDefault(require("@turf/clone"));
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var distance_1 = __importDefault(require("@turf/distance"));
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var meta_1 = require("@turf/meta");
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/**
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* Takes a reference {@link Point|point} and a FeatureCollection of Features
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* with Point geometries and returns the
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* point from the FeatureCollection closest to the reference. This calculation
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* is geodesic.
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*
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* @name nearestPoint
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* @param {Coord} targetPoint the reference point
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* @param {FeatureCollection<Point>} points against input point set
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* @returns {Feature<Point>} the closest point in the set to the reference point
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* @example
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* var targetPoint = turf.point([28.965797, 41.010086], {"marker-color": "#0F0"});
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* var points = turf.featureCollection([
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* turf.point([28.973865, 41.011122]),
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* turf.point([28.948459, 41.024204]),
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* turf.point([28.938674, 41.013324])
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* ]);
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*
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* var nearest = turf.nearestPoint(targetPoint, points);
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*
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* //addToMap
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* var addToMap = [targetPoint, points, nearest];
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* nearest.properties['marker-color'] = '#F00';
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*/
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function nearestPoint(targetPoint, points) {
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// Input validation
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if (!targetPoint)
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throw new Error("targetPoint is required");
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if (!points)
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throw new Error("points is required");
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var nearest;
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var minDist = Infinity;
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var bestFeatureIndex = 0;
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meta_1.featureEach(points, function (pt, featureIndex) {
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var distanceToPoint = distance_1.default(targetPoint, pt);
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if (distanceToPoint < minDist) {
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bestFeatureIndex = featureIndex;
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minDist = distanceToPoint;
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}
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});
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nearest = clone_1.default(points.features[bestFeatureIndex]);
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nearest.properties.featureIndex = bestFeatureIndex;
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nearest.properties.distanceToPoint = minDist;
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return nearest;
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}
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exports.default = nearestPoint;
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