ole/build/control/union.js

OpenLayers Editor

import OL3Parser from 'jsts/org/locationtech/jts/io/OL3Parser';
import { OverlayOp } from 'jsts/org/locationtech/jts/operation/overlay';
import LinearRing from 'ol/geom/LinearRing';
import { Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, } from 'ol/geom';
import TopologyControl from './topology';
import unionSVG from '../../img/union.svg';
/**
 * Control for creating a union of geometries.
 * @extends {Control}
 * @alias ole.Union
 */
class Union extends TopologyControl {
    /**
     * @inheritdoc
     * @param {Object} [options] Control options.
     * @param {number} [options.hitTolerance] Select tolerance in pixels
     *   (default is 10)
     */
    constructor(options) {
        super(Object.assign({ title: 'Union', className: 'ole-control-union', image: unionSVG }, options));
    }
    /**
     * Apply a union for given features.
     * @param {Array.<ol.Feature>} features Features to union.
     */
    applyTopologyOperation(features) {
        super.applyTopologyOperation(features);
        const parser = new OL3Parser();
        parser.inject(Point, LineString, LinearRing, Polygon, MultiPoint, MultiLineString, MultiPolygon);
        for (let i = 1; i < features.length; i += 1) {
            const geom = parser.read(features[0].getGeometry());
            const otherGeom = parser.read(features[i].getGeometry());
            const unionGeom = OverlayOp.union(geom, otherGeom);
            features[0].setGeometry(parser.write(unionGeom));
            features[i].setGeometry(null);
        }
    }
}
export default Union;