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
53 lines
1.5 KiB
JavaScript
53 lines
1.5 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, Vector as VectorSource} from 'ol/source';
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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);
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const street = features[0];
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// convert to a turf.js feature
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const turfLine = format.writeFeatureObject(street);
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// show a marker every 200 meters
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const distance = 0.2;
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// get the line length in kilometers
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const length = turf.lineDistance(turfLine, 'kilometers');
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for (let i = 1; i <= length / distance; i++) {
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const turfPoint = turf.along(turfLine, i * distance, 'kilometers');
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// convert the generated point to a OpenLayers feature
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const marker = format.readFeature(turfPoint);
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marker.getGeometry().transform('EPSG:4326', 'EPSG:3857');
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source.addFeature(marker);
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}
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street.getGeometry().transform('EPSG:4326', 'EPSG:3857');
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source.addFeature(street);
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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([126.980366, 37.526540]),
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zoom: 15
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})
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});
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