All docschevron-rightMapbox GL JSchevron-rightarrow-leftExampleschevron-rightAnimate a point along a route

Animate a point along a route

Use Turf to smoothly animate a point along the distance of a line.

Referencing images in a style's sprite

This example uses the Mapbox Streets style. The icon-image used in this example comes from the Mapbox Streets style's sprite.

To view all available images in a style's sprite or add additional images, open the style in Mapbox Studio and click the Images tab. To add a new image to the style at runtime see the Add an icon to the map example.

<!DOCTYPE html>
<meta charset="utf-8">
<title>Animate a point along a route</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="" rel="stylesheet">
<script src=""></script>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
.overlay {
position: absolute;
top: 10px;
left: 10px;
.overlay button {
font: 600 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
background-color: #3386c0;
color: #fff;
display: inline-block;
margin: 0;
padding: 10px 20px;
border: none;
cursor: pointer;
border-radius: 3px;
.overlay button:hover {
background-color: #4ea0da;
<script src=""></script>
<div id="map"></div>
<div class="overlay">
<button id="replay">Replay</button>
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio,
style: 'mapbox://styles/mapbox/dark-v11',
center: [-96, 37.8],
zoom: 3,
pitch: 40
// San Francisco
const origin = [-122.414, 37.776];
// Washington DC
const destination = [-77.032, 38.913];
// A simple line from origin to destination.
const route = {
'type': 'FeatureCollection',
'features': [
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': [origin, destination]
// A single point that animates along the route.
// Coordinates are initially set to origin.
const point = {
'type': 'FeatureCollection',
'features': [
'type': 'Feature',
'properties': {},
'geometry': {
'type': 'Point',
'coordinates': origin
// Calculate the distance in kilometers between route start/end point.
const lineDistance = turf.length(route.features[0]);
const arc = [];
// Number of steps to use in the arc and animation, more steps means
// a smoother arc and animation, but too many steps will result in a
// low frame rate
const steps = 500;
// Draw an arc between the `origin` & `destination` of the two points
for (let i = 0; i < lineDistance; i += lineDistance / steps) {
const segment = turf.along(route.features[0], i);
// Update the route with calculated arc coordinates
route.features[0].geometry.coordinates = arc;
// Used to increment the value of the point measurement against the route.
let counter = 0;
map.on('load', () => {
// Add a source and layer displaying a point which will be animated in a circle.
map.addSource('route', {
'type': 'geojson',
'data': route
map.addSource('point', {
'type': 'geojson',
'data': point
'id': 'route',
'source': 'route',
'type': 'line',
'paint': {
'line-width': 2,
'line-color': '#007cbf'
'id': 'point',
'source': 'point',
'type': 'symbol',
'layout': {
// This icon is a part of the Mapbox Streets style.
// To view all images available in a Mapbox style, open
// the style in Mapbox Studio and click the "Images" tab.
// To add a new image to the style at runtime see
'icon-image': 'airport',
'icon-size': 1.5,
'icon-rotate': ['get', 'bearing'],
'icon-rotation-alignment': 'map',
'icon-allow-overlap': true,
'icon-ignore-placement': true
function animate() {
const start =
counter >= steps ? counter - 1 : counter
const end =
counter >= steps ? counter : counter + 1
if (!start || !end) return;
// Update point geometry to a new position based on counter denoting
// the index to access the arc
point.features[0].geometry.coordinates =
// Calculate the bearing to ensure the icon is rotated to match the route arc
// The bearing is calculated between the current point and the next point, except
// at the end of the arc, which uses the previous point and the current point
point.features[0].properties.bearing = turf.bearing(
// Update the source with this new data
// Request the next frame of animation as long as the end has not been reached
if (counter < steps) {
counter = counter + 1;
document.getElementById('replay').addEventListener('click', () => {
// Set the coordinates of the original point back to origin
point.features[0].geometry.coordinates = origin;
// Update the source layer
// Reset the counter
counter = 0;
// Restart the animation
// Start the animation