turf-hexGrid
Generates a hexgrid that covers the specified bbox.
<!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"></script>
<script src="assets/js/es6-promise.min.js"></script>
<title>Turf and OpenLayers 3 - hexGrid</title>
</head>
<body>
<div id="map" class="map"></div>
<button id="switchhexgridoption" type="button">'Show layer with triangle option 'false'</button>
<script type="text/javascript">
// Declare a source for 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: [0, 121, 88, 1],
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: 5
})
});
var bbox = [-5, 42, 9, 52];
var cellSize = 200;
var optionTriangles = true;
var hex = turf.hexGrid(bbox, cellSize, 'kilometers', optionTriangles);
vectorSourcePolygons.addFeatures((new ol.format.GeoJSON()).readFeatures(hex, {
featureProjection: 'EPSG:3857'
}));
var button = document.getElementById('switchhexgridoption');
button.addEventListener('click', function(e) {
optionTriangles = !optionTriangles;
this.innerHTML = 'Show layer with triangle option \'' + (!optionTriangles).toString() + '\'';
hex = turf.hexGrid(bbox, cellSize, 'kilometers', optionTriangles);
vectorSourcePolygons.clear();
vectorSourcePolygons.addFeatures((new ol.format.GeoJSON()).readFeatures(hex, {
featureProjection: 'EPSG:3857'
}));
});
</script>
</body>
</html>