マップをバウンディングボックスに合わせる | Mapbox GL JS | ドキュメント

fitBounds を使用すると、ピクセルサイズに関係なく、マップの指定領域をビューに表示します。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>マップをバウンディングボックスに合わせる</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#fit {
display: block;
position: relative;
margin: 0px auto;
width: 50%;
height: 40px;
padding: 10px;
border: none;
border-radius: 3px;
font-size: 12px;
text-align: center;
color: #fff;
background: #ee8a65;
}
</style>
<div id="map"></div>
<br>
<button id="fit">Fit to Kenya</button>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map', // container ID
style: 'mapbox://styles/mapbox/streets-v11', // style URL
center: [39.657325, -4.024902], // starting position ([lng, lat] for Mombasa, Kenya)
zoom: 9 // starting zoom
});
 
/*
*  When a user clicks the button, `fitBounds()` zooms and pans
*  the viewport to contain a bounding box that surrounds Kenya.
*  The [lng, lat] pairs are the southwestern and northeastern
*  corners of the specified geographical bounds.
*/
document.getElementById('fit').addEventListener('click', () => {
map.fitBounds([
[32.958984, -5.353521], // southwestern corner of the bounds
[43.50585, 5.615985] // northeastern corner of the bounds
]);
});
</script>
 
</body>
</html>