57 lines
1.7 KiB
JavaScript
57 lines
1.7 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 _ol_Map_ from '../src/ol/Map.js';
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import _ol_View_ from '../src/ol/View.js';
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import _ol_format_GeoJSON_ from '../src/ol/format/GeoJSON.js';
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import _ol_layer_Tile_ from '../src/ol/layer/Tile.js';
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import _ol_layer_Vector_ from '../src/ol/layer/Vector.js';
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import _ol_proj_ from '../src/ol/proj.js';
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import _ol_source_OSM_ from '../src/ol/source/OSM.js';
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import _ol_source_Vector_ from '../src/ol/source/Vector.js';
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var source = new _ol_source_Vector_();
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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 _ol_format_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 _ol_layer_Vector_({
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source: source
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});
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var rasterLayer = new _ol_layer_Tile_({
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source: new _ol_source_OSM_()
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});
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var map = new _ol_Map_({
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layers: [rasterLayer, vectorLayer],
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target: document.getElementById('map'),
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view: new _ol_View_({
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center: _ol_proj_.fromLonLat([126.980366, 37.526540]),
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zoom: 15
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})
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});
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