ズーム・レベルに応じて建物の色を変更 | Mapbox GL JS | ドキュメント

補間式を使用して建物レイヤーをease-inし、色から色への変化をスムーズにします。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ズーム・レベルに応じて建物の色を変更</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>
#zoom {
display: block;
position: relative;
margin: 20px 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>
<button id="zoom">Zoom to buildings</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: [-90.73414, 14.55524], // starting position [lng, lat]
zoom: 15 // starting zoom
});
 
map.on('load', () => {
map.setPaintProperty('building', 'fill-color', [
'interpolate',
// Set the exponential rate of change to 0.5
['exponential', 0.5],
['zoom'],
// When zoom is 15, buildings will be beige.
15,
'#D9D3C9',
// When zoom is 18 or higher, buildings will be yellow.
18,
'#ffd700'
]);
 
map.setPaintProperty('building', 'fill-opacity', [
'interpolate',
// Set the exponential rate of change to 0.5
['exponential', 0.5],
['zoom'],
// When zoom is 10, buildings will be 100% transparent.
10,
0.5,
// When zoom is 18 or higher, buildings will be 100% opaque.
18,
1
]);
});
 
// When the button is clicked, zoom in to zoom level 19.
// The animation duration is 9000 milliseconds.
document.getElementById('zoom').addEventListener('click', () => {
map.zoomTo(18, { duration: 9000 });
});
</script>
 
</body>
</html>