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