Change Building Color Based on Zoom Level
Zoom-dependent styles in Maptoolkit Maps JS use interpolate expressions to transition a paint property smoothly between values as the zoom level changes. This example applies a color ramp to the 3D building extrusion layer so buildings shift from a neutral tone at low zoom to a highlighted color when zoomed in. Use this technique to create context-aware styles that reveal detail progressively as the user zooms, without needing separate layers for each zoom range.
const API_KEY = 'YOUR_API_KEY';
const map = new maptoolkit.Map({
container: 'map',
apiKey: API_KEY,
style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
center: [2.3488, 48.8534],
zoom: 13,
attributionControl: { compact: false }
});
map.addControl(new maptoolkit.NavigationControl(), 'top-right');
map.on('load', () => {
['building_base', 'building_multicolored'].forEach((id) => {
map.setPaintProperty(id, 'fill-color', [
'interpolate',
['exponential', 0.5],
['zoom'],
15, '#e2714b',
22, '#eee695'
]);
map.setPaintProperty(id, 'fill-opacity', [
'interpolate',
['exponential', 0.5],
['zoom'],
15, 0,
22, 1
]);
});
});
document.getElementById('zoom').addEventListener('click', () => {
map.zoomTo(19, { duration: 9000 });
});<!DOCTYPE html>
<html lang="en">
<head>
<title>Change Building Color Based on Zoom Level - Maptoolkit Maps JS</title>
<meta property="og:description" content="Apply zoom-dependent color expressions to existing map layers." />
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.js"></script>
<link rel="stylesheet" href="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.css" />
<style>
html, body { width: 100%; height: 100%; margin: 0; padding: 0; }
#map { width: 100%; height: 100%; }
#zoom {
display: block;
position: absolute;
top: 20px;
left: 50%;
transform: translate(-50%);
width: 50%;
height: 40px;
padding: 10px;
border: none;
border-radius: 3px;
font-size: 12px;
text-align: center;
color: #fff;
background: #ee8a65;
cursor: pointer;
}
#zoom:hover { background: #d4784f; }
</style>
</head>
<body>
<div id="map"></div>
<button id="zoom">Zoom to buildings</button>
<script>
const API_KEY = 'YOUR_API_KEY';
const map = new maptoolkit.Map({
container: 'map',
apiKey: API_KEY,
style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
center: [2.3488, 48.8534],
zoom: 13,
attributionControl: { compact: false }
});
map.addControl(new maptoolkit.NavigationControl(), 'top-right');
map.on('load', () => {
['building_base', 'building_multicolored'].forEach((id) => {
map.setPaintProperty(id, 'fill-color', [
'interpolate',
['exponential', 0.5],
['zoom'],
15, '#e2714b',
22, '#eee695'
]);
map.setPaintProperty(id, 'fill-opacity', [
'interpolate',
['exponential', 0.5],
['zoom'],
15, 0,
22, 1
]);
});
});
document.getElementById('zoom').addEventListener('click', () => {
map.zoomTo(19, { duration: 9000 });
});
</script>
</body>
</html>Use the prompt below with any LLM to get the same result. Make sure the Maptoolkit MCP server is connected first — check out AI Integration & MCP to get started.
Use the Maptoolkit Connector. Create an interactive map with zoom level 13, centered around [2.3488, 48.8534]. Apply a zoom-dependent color interpolation to the building layer and add a button that smoothly zooms to level 19.