57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
// NOCOMPILE
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// this example uses turf.js for which we don't have an externs file.
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import GeoJSON from '../src/ol/format/GeoJSON.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import VectorLayer from '../src/ol/layer/Vector.js';
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import {fromLonLat} from '../src/ol/proj.js';
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import OSM from '../src/ol/source/OSM.js';
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import VectorSource from '../src/ol/source/Vector.js';
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var 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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var format = new GeoJSON();
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var features = format.readFeatures(json);
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var street = features[0];
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// convert to a turf.js feature
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var turfLine = format.writeFeatureObject(street);
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// show a marker every 200 meters
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var distance = 0.2;
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// get the line length in kilometers
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var length = turf.lineDistance(turfLine, 'kilometers');
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for (var i = 1; i <= length / distance; i++) {
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var turfPoint = turf.along(turfLine, i * distance, 'kilometers');
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// convert the generated point to a OpenLayers feature
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var 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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var vectorLayer = new VectorLayer({
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source: source
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});
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var rasterLayer = new TileLayer({
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source: new OSM()
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});
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var 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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