Merge pull request #10087 from petrsloup/vector-tiles-4326-example

Add example showing vector tiles in EPSG:4326

examples/vector-tiles-4326.html

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+---
+layout: example.html
+title: Vector tiles in EPSG:4326
+shortdesc: Example showing vector tiles in EPSG:4326 (styled using ol-mapbox-style)
+docs: >
+  Example showing vector tiles in EPSG:4326 (styled using `ol-mapbox-style`) loaded from maptiler.com.
+  **Note**: Make sure to get your own API key at https://www.maptiler.com/cloud/ when using this example. No map will be visible when the API key has expired.
+tags: "vector tiles, epsg4326, mapbox style, ol-mapbox-style, maptiler"
+cloak:
+  - key: get_your_own_D6rA4zTHduk6KOKTXzGB
+    value: Get your own API key at https://www.maptiler.com/cloud/
+---
+<div id="map" class="map" style="background:none;"></div>

examples/vector-tiles-4326.js

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+import View from '../src/ol/View.js';
+import MVT from '../src/ol/format/MVT.js';
+import VectorTileSource from '../src/ol/source/VectorTile.js';
+import TileGrid from '../src/ol/tilegrid/TileGrid.js';
+
+import olms from 'ol-mapbox-style';
+import {defaultResolutions} from 'ol-mapbox-style/util.js';
+
+const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
+
+// Match the server resolutions
+const maxResolution = 360 / 512;
+defaultResolutions.length = 14;
+for (let i = 0; i < 14; ++i) {
+  defaultResolutions[i] = maxResolution / Math.pow(2, i + 1);
+}
+
+olms('map', 'https://api.maptiler.com/maps/basic-4326/style.json?key=' + key).then(function(map) {
+
+  // Custom tile grid for the EPSG:4326 projection
+  const tileGrid = new TileGrid({
+    extent: [-180, -90, 180, 90],
+    tileSize: 512,
+    resolutions: defaultResolutions
+  });
+
+  const mapboxStyle = map.get('mapbox-style');
+
+  // Replace the source with a EPSG:4326 projection source for each vector tile layer
+  map.getLayers().forEach(function(layer) {
+    const mapboxSource = layer.get('mapbox-source');
+    if (mapboxSource && mapboxStyle.sources[mapboxSource].type === 'vector') {
+      const source = layer.getSource();
+      layer.setSource(new VectorTileSource({
+        format: new MVT(),
+        projection: 'EPSG:4326',
+        urls: source.getUrls(),
+        tileGrid: tileGrid
+      }));
+    }
+  });
+
+  // Configure the map with a view with EPSG:4326 projection
+  map.setView(new View({
+    projection: 'EPSG:4326',
+    zoom: mapboxStyle.zoom,
+    center: mapboxStyle.center
+  }));
+
+});