Change building color based on zoom level

Use the interpolate expression to ease-in the building layer and smoothly fade from one color to the next.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
    container: 'map',
    style: MapStyle.BASE,
    center: [-90.73414, 14.55524],
    zoom: 13
});

map.on('load', function () {
    map.setPaintProperty('Building', 'fill-color', [
        'interpolate',
        ['exponential', 0.5],
        ['zoom'],
        15,
        '#e2714b',
        22,
        '#eee695'
    ]);

    map.setPaintProperty('Building', 'fill-opacity', [
        'interpolate',
        ['exponential', 0.5],
        ['zoom'],
        15,
        0,
        22,
        1
    ]);
});

document.getElementById('zoom').addEventListener('click', function () {
    map.zoomTo(19, { duration: 9000 });
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Change building color based on zoom level</title>
  <link rel="stylesheet" href="./style.css">
</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 type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Change building color based on zoom level</title>
  <script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
  <link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.css" rel="stylesheet" />
  <style>
    body {
      margin: 0;
      padding: 0;
    }

    #map {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 100%;
    }

    #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>
</head>

<body>
  <div id="map"></div>
  <button id="zoom">Zoom to buildings</button>
  <script>
    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
    const map = new maptilersdk.Map({
      container: 'map',
      style: maptilersdk.MapStyle.BASE,
      center: [-90.73414, 14.55524],
      zoom: 13
    });

    map.on('load', function () {
      map.setPaintProperty('Building', 'fill-color', [
        'interpolate',
        ['exponential', 0.5],
        ['zoom'],
        15,
        '#e2714b',
        22,
        '#eee695'
      ]);

      map.setPaintProperty('Building', 'fill-opacity', [
        'interpolate',
        ['exponential', 0.5],
        ['zoom'],
        15,
        0,
        22,
        1
      ]);
    });

    document.getElementById('zoom').addEventListener('click', function () {
      map.zoomTo(19, { duration: 9000 });
    });
  </script>
</body>

</html>