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61 lines
1.9 KiB
TypeScript
61 lines
1.9 KiB
TypeScript
/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/**
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* Util for geometry related operations.
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*/
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import GeoJSON from 'ol/format/GeoJSON';
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import Feature from 'ol/Feature';
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import { Point as OlPoint } from 'ol/geom';
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import VectorSource from 'ol/source/Vector';
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import { Point as GeoJsonPoint } from 'geojson';
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/**
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* Extracts the coordinate from a Point GeoJSON in the current map projection.
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*
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* @param geoJsonPoint The GeoJSON string for the point
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*
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* @returns The coordinate
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*/
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export const getProjectedCoordinateFromPointGeoJson = (
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geoJsonPoint: GeoJsonPoint,
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) => {
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const geom: OlPoint = new GeoJSON().readGeometry(geoJsonPoint, {
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// TODO: adapt to map projection
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featureProjection: 'EPSG:3857',
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}) as OlPoint;
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return geom.getCoordinates();
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};
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/**
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* Computes the extent for an array of features.
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*
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* @param features An Array of OpenLayers features
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* @returns The OpenLayers extent or undefined
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*/
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export const getExtentFromFeatures = (features: Feature[]) => {
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if (features.length === 0) {
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return undefined;
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}
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const source = new VectorSource();
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source.addFeatures(features);
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return source.getExtent();
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};
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