Draw a radius
Estimated reading time: 1 minuteUse the code sample below to draw a location radius using a polygon. This example uses the Turf.js library to generate a circle as a polygon
<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<link href="https://unpkg.com/[email protected]/dist/maplibre-gl.css" rel="stylesheet" />
<script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@turf/turf@7/turf.min.js"></script>
<style>
html,
body {
margin: 0;
padding: 0;
height: 100%;
}
#map {
min-height: 500px;
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
// Don't forget to replace <YOUR_ACCESS_TOKEN> by your own access token
const accessToken = "<YOUR_ACCESS_TOKEN>";
const radiusCenter = [2.3454, 48.8452];
const map = new maplibregl.Map({
container: "map",
style: `https://api.jawg.io/styles/jawg-streets.json?access-token=${accessToken}`,
zoom: 13,
center: radiusCenter,
hash: true,
}).addControl(new maplibregl.NavigationControl(), "top-right");
// This plugin is used for right to left languages
maplibregl.setRTLTextPlugin("https://unpkg.com/@mapbox/[email protected]/mapbox-gl-rtl-text.min.js");
map.on("load", () => {
// Generate a polygon using turf.circle.
// See https://turfjs.org/docs/api/circle
const radius = 1; // kilometer
const options = {
steps: 64,
units: "kilometers",
};
const circle = turf.circle(radiusCenter, radius, options);
// Add the circle as a GeoJSON source
map.addSource("location-radius", {
type: "geojson",
data: circle,
});
// Add a fill layer with some transparency
map.addLayer({
id: "location-radius",
type: "fill",
source: "location-radius",
paint: {
"fill-color": "#8CCFFF",
"fill-opacity": 0.5,
},
});
// Add a line layer to draw the circle outline
map.addLayer({
id: "location-radius-outline",
type: "line",
source: "location-radius",
paint: {
"line-color": "#0094ff",
"line-width": 3,
},
});
});
</script>
</body>
</html>