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WebGL Vector Tiles Layer

simple5 mapbox7 vector79 tiles7 webgl17

Example of a vector tiles map rendered using WebGL.

A simple map showing Mapbox vector tiles, rendered using WebGL. Note: Make sure to get your own Mapbox API key when using this example. No map will be visible when the API key has expired.

main.js
import MVT from 'ol/format/MVT.js';
import Map from 'ol/Map.js';
import VectorTile from 'ol/layer/VectorTile.js';
import VectorTileSource from 'ol/source/VectorTile.js';
import View from 'ol/View.js';
import WebGLVectorTileLayerRenderer from 'ol/renderer/webgl/VectorTileLayer.js';
import {Fill, Icon, Stroke, Style, Text} from 'ol/style.js';
import {asArray} from 'ol/color.js';
import {packColor, parseLiteralStyle} from 'ol/webgl/styleparser.js';

const key =
  'Your Mapbox access token from https://mapbox.com/ here';

const result = parseLiteralStyle({
  'fill-color': ['get', 'fillColor'],
  'stroke-color': ['get', 'strokeColor'],
  'stroke-width': ['get', 'strokeWidth'],
  'circle-radius': 4,
  'circle-fill-color': '#777',
});

class WebGLVectorTileLayer extends VectorTile {
  createRenderer() {
    return new WebGLVectorTileLayerRenderer(this, {
      style: {
        builder: result.builder,
        attributes: {
          fillColor: {
            size: 2,
            callback: (feature) => {
              const style = this.getStyle()(feature, 1)[0];
              const color = asArray(style?.getFill()?.getColor() || '#eee');
              return packColor(color);
            },
          },
          strokeColor: {
            size: 2,
            callback: (feature) => {
              const style = this.getStyle()(feature, 1)[0];
              const color = asArray(style?.getStroke()?.getColor() || '#eee');
              return packColor(color);
            },
          },
          strokeWidth: {
            size: 1,
            callback: (feature) => {
              const style = this.getStyle()(feature, 1)[0];
              return style?.getStroke()?.getWidth() || 0;
            },
          },
        },
      },
    });
  }
}

const map = new Map({
  layers: [
    new WebGLVectorTileLayer({
      source: new VectorTileSource({
        attributions:
          '© <a href="https://www.mapbox.com/map-feedback/">Mapbox</a> ' +
          '© <a href="https://www.openstreetmap.org/copyright">' +
          'OpenStreetMap contributors</a>',
        format: new MVT(),
        url:
          'https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/' +
          '{z}/{x}/{y}.vector.pbf?access_token=' +
          key,
      }),
      style: createMapboxStreetsV6Style(Style, Fill, Stroke, Icon, Text),
    }),
  ],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});
index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>WebGL Vector Tiles Layer</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>

    <script src="https://openlayers.org/en/v9.2.2/examples/resources/mapbox-streets-v6-style.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>
package.json
{
  "name": "webgl-vector-tiles",
  "dependencies": {
    "ol": "9.2.2"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}