Skip to content

Instantly share code, notes, and snippets.

@danswick
Last active April 24, 2024 20:14
Show Gist options
  • Save danswick/83a8ddff7fb9193176a975a02a896792 to your computer and use it in GitHub Desktop.
Save danswick/83a8ddff7fb9193176a975a02a896792 to your computer and use it in GitHub Desktop.
Fit map to polygon bounds with Turf and Mapbox GL JS
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title></title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.18.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.18.0/mapbox-gl.css' rel='stylesheet' />
<script src='https://api.mapbox.com/mapbox.js/plugins/turf/v2.0.2/turf.min.js'></script>
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
#fitBounds {
background-color: #ee8a65;
font-family: Helvetica, Arial, Sans-Serif;
color: #fff;
position: absolute;
top: 1em;
right: 1em;
padding: 0.7em;
border-radius: 0.2em;
cursor: pointer;
}
</style>
</head>
<body>
<div id='map'></div>
<div id='fitBounds' onclick='fit()'>fit to polygon</div>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoiZGFuc3dpY2siLCJhIjoiY2l1dTUzcmgxMDJ0djJ0b2VhY2sxNXBiMyJ9.25Qs4HNEkHubd4_Awbd8Og';
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/mapbox/streets-v8', //stylesheet location
center: [-74.50, 40], // starting position
zoom: 9 // starting zoom
});
var geojson = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-33.83789062499999,
60.37042901631508
],
[
-39.814453125,
55.825973254619015
],
[
-33.662109375,
53.90433815627468
],
[
-25.839843749999996,
55.87531083569679
],
[
-21.708984375,
59.84481485969105
],
[
-29.619140624999996,
61.39671887310411
],
[
-33.83789062499999,
60.37042901631508
]
]
]
}
}
]
};
var bbox = turf.extent(geojson);
map.on('load', function(){
map.addSource('my-geojson', {
"type": "geojson",
"data": geojson
});
map.addLayer({
"id": "geojsonLayer",
"type": "fill",
"source": "my-geojson",
"paint": {
"fill-color": "#000fff"
}
});
});
function fit() {
map.fitBounds(bbox, {padding: 20});
}
</script>
</body>
</html>
@pm0u
Copy link

pm0u commented Apr 24, 2024

Landed here from google and wanted to note that at this point in time turf.bbox would be the way to do this in place of turf.extent

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment