79c8afdba8
To have the same path (starting with `ol/`, without `.js`) as in the documentation. The support was added in the webpack config in #8928
51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
import Map from 'ol/Map';
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import View from 'ol/View';
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import GeoJSON from 'ol/format/GeoJSON';
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import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
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import {fromLonLat} from 'ol/proj';
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import OSM from 'ol/source/OSM';
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import VectorSource from 'ol/source/Vector';
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import LinearRing from 'ol/geom/LinearRing';
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import {Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon} from 'ol/geom';
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const source = new VectorSource();
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fetch('data/geojson/roads-seoul.geojson').then(function(response) {
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return response.json();
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}).then(function(json) {
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const format = new GeoJSON();
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const features = format.readFeatures(json, {featureProjection: 'EPSG:3857'});
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const parser = new jsts.io.OL3Parser();
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parser.inject(Point, LineString, LinearRing, Polygon, MultiPoint, MultiLineString, MultiPolygon);
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for (let i = 0; i < features.length; i++) {
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const feature = features[i];
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// convert the OpenLayers geometry to a JSTS geometry
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const jstsGeom = parser.read(feature.getGeometry());
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// create a buffer of 40 meters around each line
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const buffered = jstsGeom.buffer(40);
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// convert back from JSTS and replace the geometry on the feature
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feature.setGeometry(parser.write(buffered));
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}
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source.addFeatures(features);
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});
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const vectorLayer = new VectorLayer({
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source: source
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});
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const rasterLayer = new TileLayer({
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source: new OSM()
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});
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const map = new Map({
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layers: [rasterLayer, vectorLayer],
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target: document.getElementById('map'),
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view: new View({
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center: fromLonLat([126.979293, 37.528787]),
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zoom: 15
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})
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});
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