Fit to the bounds of a LineString
Get the bounds of a LineString by passing its first coordinates to LngLatBounds and chaining extend to include the last coordinates.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Fit to the bounds of a LineString</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.12.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
.btn-control {
font:
bold 12px/20px 'Helvetica Neue',
Arial,
Helvetica,
sans-serif;
background-color: #3386c0;
color: #fff;
position: absolute;
top: 20px;
left: 50%;
z-index: 1;
border: none;
width: 200px;
margin-left: -100px;
display: block;
cursor: pointer;
padding: 10px 20px;
border-radius: 3px;
}
.btn-control:hover {
background-color: #4ea0da;
}
</style>
<div id="map"></div>
<button id="zoomto" class="btn-control">Zoom to bounds</button>
<script>
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
// A GeoJSON object with a LineString route from the White House to Capitol Hill
const geojson = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': [
[-77.0366048812866, 38.89873175227713],
[-77.03364372253417, 38.89876515143842],
[-77.03364372253417, 38.89549195896866],
[-77.02982425689697, 38.89549195896866],
[-77.02400922775269, 38.89387200688839],
[-77.01519012451172, 38.891416957534204],
[-77.01521158218382, 38.892068305429156],
[-77.00813055038452, 38.892051604275686],
[-77.00832366943358, 38.89143365883688],
[-77.00818419456482, 38.89082405874451],
[-77.00815200805664, 38.88989712255097]
]
},
'properties': {}
}
]
};
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/light-v11',
center: [-77.0214, 38.897],
zoom: 12
});
map.on('load', () => {
map.addSource('LineString', {
'type': 'geojson',
'data': geojson
});
map.addLayer({
'id': 'LineString',
'type': 'line',
'source': 'LineString',
'layout': {
'line-join': 'round',
'line-cap': 'round'
},
'paint': {
'line-color': '#BF93E4',
'line-width': 5
}
});
document.getElementById('zoomto').addEventListener('click', () => {
// Geographic coordinates of the LineString
const coordinates = geojson.features[0].geometry.coordinates;
// Create a 'LngLatBounds' with both corners at the first coordinate.
const bounds = new mapboxgl.LngLatBounds(
coordinates[0],
coordinates[0]
);
// Extend the 'LngLatBounds' to include every coordinate in the bounds result.
for (const coord of coordinates) {
bounds.extend(coord);
}
map.fitBounds(bounds, {
padding: 20
});
});
});
</script>
</body>
</html>
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.import React, { useEffect, useRef } from 'react';
import mapboxgl from 'mapbox-gl';
import 'mapbox-gl/dist/mapbox-gl.css';
const buttonStyle = {
font: "bold 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif",
backgroundColor: '#3386c0',
color: '#fff',
position: 'absolute',
textAlign: 'center',
top: '20px',
left: '50%',
zIndex: 1,
border: 'none',
width: '200px',
marginLeft: '-100px',
display: 'block',
cursor: 'pointer',
padding: '10px 20px',
borderRadius: '3px'
};
const geojson = {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'LineString',
coordinates: [
[-77.0366048812866, 38.89873175227713],
[-77.03364372253417, 38.89876515143842],
[-77.03364372253417, 38.89549195896866],
[-77.02982425689697, 38.89549195896866],
[-77.02400922775269, 38.89387200688839],
[-77.01519012451172, 38.891416957534204],
[-77.01521158218382, 38.892068305429156],
[-77.00813055038452, 38.892051604275686],
[-77.00832366943358, 38.89143365883688],
[-77.00818419456482, 38.89082405874451],
[-77.00815200805664, 38.88989712255097]
]
},
properties: {}
}
]
};
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
const handleClick = () => {
const coordinates = geojson.features[0].geometry.coordinates;
const bounds = new mapboxgl.LngLatBounds(coordinates[0], coordinates[0]);
for (const coord of coordinates) {
bounds.extend(coord);
}
mapRef.current.fitBounds(bounds, {
padding: 20
});
};
useEffect(() => {
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
mapRef.current = new mapboxgl.Map({
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/light-v11',
center: [-77.0214, 38.897],
zoom: 12
});
mapRef.current.on('load', () => {
mapRef.current.addSource('LineString', {
type: 'geojson',
data: geojson
});
mapRef.current.addLayer({
id: 'LineString',
type: 'line',
source: 'LineString',
layout: {
'line-join': 'round',
'line-cap': 'round'
},
paint: {
'line-color': '#BF93E4',
'line-width': 5
}
});
});
return () => mapRef.current.remove();
}, []);
return (
<>
<div id="map" ref={mapContainerRef} style={{ height: '100%' }}></div>
<button id="zoomto" style={buttonStyle} onClick={handleClick}>
Zoom to bounds
</button>
</>
);
};
export default MapboxExample;
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.Was this example helpful?