node-red-contrib-tak-registration
Version:
A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK
55 lines (54 loc) • 2.04 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var clone_1 = __importDefault(require("@turf/clone"));
var distance_1 = __importDefault(require("@turf/distance"));
var meta_1 = require("@turf/meta");
/**
* Takes a reference {@link Point|point} and a FeatureCollection of Features
* with Point geometries and returns the
* point from the FeatureCollection closest to the reference. This calculation
* is geodesic.
*
* @name nearestPoint
* @param {Coord} targetPoint the reference point
* @param {FeatureCollection<Point>} points against input point set
* @returns {Feature<Point>} the closest point in the set to the reference point
* @example
* var targetPoint = turf.point([28.965797, 41.010086], {"marker-color": "#0F0"});
* var points = turf.featureCollection([
* turf.point([28.973865, 41.011122]),
* turf.point([28.948459, 41.024204]),
* turf.point([28.938674, 41.013324])
* ]);
*
* var nearest = turf.nearestPoint(targetPoint, points);
*
* //addToMap
* var addToMap = [targetPoint, points, nearest];
* nearest.properties['marker-color'] = '#F00';
*/
function nearestPoint(targetPoint, points) {
// Input validation
if (!targetPoint)
throw new Error("targetPoint is required");
if (!points)
throw new Error("points is required");
var nearest;
var minDist = Infinity;
var bestFeatureIndex = 0;
meta_1.featureEach(points, function (pt, featureIndex) {
var distanceToPoint = distance_1.default(targetPoint, pt);
if (distanceToPoint < minDist) {
bestFeatureIndex = featureIndex;
minDist = distanceToPoint;
}
});
nearest = clone_1.default(points.features[bestFeatureIndex]);
nearest.properties.featureIndex = bestFeatureIndex;
nearest.properties.distanceToPoint = minDist;
return nearest;
}
exports.default = nearestPoint;