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
51 lines (50 loc) • 1.91 kB
JavaScript
import { multiPolygon, polygon, } from "@turf/helpers";
import { getGeom } from "@turf/invariant";
import polygonClipping from "polygon-clipping";
/**
* Takes two {@link Polygon|polygon} or {@link MultiPolygon|multi-polygon} geometries and
* finds their polygonal intersection. If they don't intersect, returns null.
*
* @name intersect
* @param {Feature<Polygon | MultiPolygon>} poly1 the first polygon or multipolygon
* @param {Feature<Polygon | MultiPolygon>} poly2 the second polygon or multipolygon
* @param {Object} [options={}] Optional Parameters
* @param {Object} [options.properties={}] Translate GeoJSON Properties to Feature
* @returns {Feature|null} returns a feature representing the area they share (either a {@link Polygon} or
* {@link MultiPolygon}). If they do not share any area, returns `null`.
* @example
* var poly1 = turf.polygon([[
* [-122.801742, 45.48565],
* [-122.801742, 45.60491],
* [-122.584762, 45.60491],
* [-122.584762, 45.48565],
* [-122.801742, 45.48565]
* ]]);
*
* var poly2 = turf.polygon([[
* [-122.520217, 45.535693],
* [-122.64038, 45.553967],
* [-122.720031, 45.526554],
* [-122.669906, 45.507309],
* [-122.723464, 45.446643],
* [-122.532577, 45.408574],
* [-122.487258, 45.477466],
* [-122.520217, 45.535693]
* ]]);
*
* var intersection = turf.intersect(poly1, poly2);
*
* //addToMap
* var addToMap = [poly1, poly2, intersection];
*/
export default function intersect(poly1, poly2, options) {
if (options === void 0) { options = {}; }
var geom1 = getGeom(poly1);
var geom2 = getGeom(poly2);
var intersection = polygonClipping.intersection(geom1.coordinates, geom2.coordinates);
if (intersection.length === 0)
return null;
if (intersection.length === 1)
return polygon(intersection[0], options.properties);
return multiPolygon(intersection, options.properties);
}