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
58 lines (57 loc) • 2.14 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var helpers_1 = require("@turf/helpers");
var meta_1 = require("@turf/meta");
var concaveman_1 = __importDefault(require("concaveman"));
/**
* Takes a {@link Feature} or a {@link FeatureCollection} and returns a convex hull {@link Polygon}.
*
* Internally this uses
* the [convex-hull](https://github.com/mikolalysenko/convex-hull) module that implements a
* [monotone chain hull](http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain).
*
* @name convex
* @param {GeoJSON} geojson input Feature or FeatureCollection
* @param {Object} [options={}] Optional parameters
* @param {number} [options.concavity=Infinity] 1 - thin shape. Infinity - convex hull.
* @param {Object} [options.properties={}] Translate Properties to Feature
* @returns {Feature<Polygon>} a convex hull
* @example
* var points = turf.featureCollection([
* turf.point([10.195312, 43.755225]),
* turf.point([10.404052, 43.8424511]),
* turf.point([10.579833, 43.659924]),
* turf.point([10.360107, 43.516688]),
* turf.point([10.14038, 43.588348]),
* turf.point([10.195312, 43.755225])
* ]);
*
* var hull = turf.convex(points);
*
* //addToMap
* var addToMap = [points, hull]
*/
function convex(geojson, options) {
if (options === void 0) { options = {}; }
// Default parameters
options.concavity = options.concavity || Infinity;
// Container
var points = [];
// Convert all points to flat 2D coordinate Array
meta_1.coordEach(geojson, function (coord) {
points.push([coord[0], coord[1]]);
});
if (!points.length) {
return null;
}
var convexHull = concaveman_1.default(points, options.concavity);
// Convex hull should have at least 3 different vertices in order to create a valid polygon
if (convexHull.length > 3) {
return helpers_1.polygon([convexHull]);
}
return null;
}
exports.default = convex;