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data-random.html
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data-random.html
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<!doctype html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" type="text/css">
<link rel="stylesheet" href="assets/css/styles.css" type="text/css">
<script src="//cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>
<script src="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js" type="text/javascript"></script>
<script src="assets/js/helpers.js"></script>
<title>Turf and OpenLayers 3 - Random</title>
</head>
<body>
<div id="map" class="map"></div>
<button id="drawrandom" data-toggle="false" type="button">
Add random polygons on the map extent
</button>
<script type="text/javascript">
// Declare a source for random polygons
var vectorSourcePolygons = new ol.source.Vector();
var vectorLayerPolygons = new ol.layer.Vector({
source: vectorSourcePolygons,
style: [
new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'black',
width: 1
})
})
]
});
// Instanciate a map and add layers
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayerPolygons
],
view: new ol.View({
center: ol.proj.fromLonLat([-1.5603, 47.2383]),
zoom: 11
})
});
// Create a button and bind a click function
var button = document.getElementById('drawrandom');
var draw;
button.addEventListener('click', function(e) {
// Generate and add random features
vectorSourcePolygons.clear();
var pointsGeojson = turf.random('polygons', 50, {
bbox: ol.proj.transformExtent(map.getView().calculateExtent(map.getSize()), 'EPSG:3857', 'EPSG:4326'),
max_radial_length: 0.01
});
console.log(pointsGeojson);
var newfeatures = geojsonToFeatures(pointsGeojson, {
featureProjection: 'EPSG:3857'
});
vectorSourcePolygons.addFeatures(newfeatures);
});
</script>
</body>
</html>