Adding an example with WMTS tiles from IGN Geoportail

examples/wmts-ign.html

@@ -0,0 +1,18 @@
+---
+template: example.html
+title: IGN WMTS example
+shortdesc: Demonstrates displaying IGN (France) WMTS layers.
+docs: >
+    In this example an IGN WMTS layer is displayed.
+    For more information on IGN's WMTS service see the
+    <a href="http://professionnels.ign.fr/api-sig">IGN Géoportail API web page
+    </a> and
+    <a href="http://www.geoportail.gouv.fr/depot/api/cgu/DT_APIGeoportail.pdf">
+    Descriptif technique des web services du Géoportail</a> (french).
+tags: "french, ign, geoportail, wmts"
+---
+<div class="row-fluid">
+  <div class="span12">
+    <div id="map" class="map"></div>
+  </div>
+</div>

examples/wmts-ign.js

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+goog.require('ol.Attribution');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.control');
+goog.require('ol.extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.proj');
+goog.require('ol.source.WMTS');
+goog.require('ol.tilegrid.WMTS');
+
+
+var map = new ol.Map({
+  target: 'map',
+  renderer: 'dom',
+  controls: ol.control.defaults({
+    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
+      collapsible: false
+    })
+  }),
+  view: new ol.View({
+    zoom: 5,
+    center: ol.proj.transform([5, 45], 'EPSG:4326', 'EPSG:3857')
+  })
+});
+
+var resolutions = [];
+var matrixIds = [];
+var proj3857 = ol.proj.get('EPSG:3857');
+var maxResolution = ol.extent.getWidth(proj3857.getExtent()) / 256;
+
+for (var i = 0; i < 18; i++) {
+  matrixIds[i] = i.toString();
+  resolutions[i] = maxResolution / Math.pow(2, i);
+}
+
+var tileGrid = new ol.tilegrid.WMTS({
+  origin: [-20037508, 20037508],
+  resolutions: resolutions,
+  matrixIds: matrixIds
+});
+
+// API key valid for 'openlayers.org' and 'localhost'.
+// Expiration date is 06/29/2018.
+var key = '2mqbg0z6cx7ube8gsou10nrt';
+
+var ign_source = new ol.source.WMTS({
+  url: 'http://wxs.ign.fr/' + key + '/wmts',
+  layer: 'GEOGRAPHICALGRIDSYSTEMS.MAPS',
+  matrixSet: 'PM',
+  format: 'image/jpeg',
+  projection: 'EPSG:3857',
+  tileGrid: tileGrid,
+  style: 'normal',
+  attributions: [new ol.Attribution({
+    html: '<a href="http://www.geoportail.fr/" target="_blank">' +
+        '<img src="http://api.ign.fr/geoportail/api/js/latest/' +
+        'theme/geoportal/img/logo_gp.gif"></a>'
+  })]
+});
+
+var ign = new ol.layer.Tile({
+  source: ign_source
+});
+
+map.addLayer(ign);