<!doctype html>
<html lang="en">
  <head>
    <link rel="stylesheet" href="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" type="text/css">
    <style>
      .map {
        height: 500px;
        width: 100%;
      }
      #map .ol-zoom .ol-zoom-out {
        margin-top: 204px;
      }
      #map .ol-zoomslider {
        background-color: transparent;
        top: 2.3em;
      }

      #map .ol-touch .ol-zoom .ol-zoom-out {
        margin-top: 212px;
      }
      #map .ol-touch .ol-zoomslider {
        top: 2.75em;
      }

      #map .ol-zoom-in.ol-has-tooltip:hover [role=tooltip],
      #map .ol-zoom-in.ol-has-tooltip:focus [role=tooltip] {
        top: 3px;
      }

      #map .ol-zoom-out.ol-has-tooltip:hover [role=tooltip],
      #map .ol-zoom-out.ol-has-tooltip:focus [role=tooltip] {
        top: 232px;
      }
    </style>
    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
    <title>Expo prospecting slippy map</title>
  </head>
  <body>
    <h2>Expo prospecting slippy map</h2>
    <div id="map" class="map"></div>
    <div id="info">&nbsp;</div>
    <script type="text/javascript">
      // import Map from 'ol/Map.js';
      // import View from 'ol/View.js';
      // import GPX from 'ol/format/GPX.js';
      // import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      // import BingMaps from 'ol/source/BingMaps.js';
      // import VectorSource from 'ol/source/Vector.js';
      // import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';
      var lon = 13.8081;
      var lat = 47.6776;
      var zoom = 14;

      var style = {
        'Point': new ol.style.Style({
          image: new ol.style.Circle({
            fill: new ol.style.Fill({
              color: 'rgba(255,255,0,0.4)'
            }),
            radius: 5,
            stroke: new ol.style.Stroke({
              color: '#ff0',
              width: 1
            })
          })
        }),
        'LineString': new ol.style.Style({
          stroke: new ol.style.Stroke({
            color: '#f00',
            width: 3
          })
        }),
        'MultiLineString': new ol.style.Style({
          stroke: new ol.style.Stroke({
            color: '#0f0',
            width: 3
          })
        })
      };

      var vector = new ol.layer.Vector({
        source: new ol.source.Vector({
          url: 'http://expo.survex.com/expofiles/gpslogs/essentials/essentials2019.gpx',
          format: new ol.format.GPX()
        }),
        style: function(feature) {
          return style[feature.getGeometry().getType()];
        }
      });

      var map = new ol.Map({
        //maxExtent: new ol.bounds(-20037508.34,-20037508.34,20037508.34, 20037508.34),
        numZoomLevels: 18,
        maxResolution: 156543,
        units: 'meters',
        //projection: new ol.projection("EPSG:900913"),
        //displayProjection: new ol.projection("EPSG:4326"),

        target: 'map',
        layers: [
          // new ol.layer.Tile({
          //   source: new ol.source.OSM()
          // }),
          new ol.layer.Tile({
            source: new ol.source.OSM({
            })
          }),
          vector
        ],
        view: new ol.View({
          center: ol.proj.fromLonLat([lon, lat]),
          zoom: zoom
        })
      });

      var displayFeatureInfo = function(pixel) {
        var features = [];
        map.forEachFeatureAtPixel(pixel, function(feature) {
          features.push(feature);
        });
        if (features.length > 0) {
          var info = [];
          var i, ii;
          for (i = 0, ii = features.length; i < ii; ++i) {
            info.push(features[i].get('name'));
          }
          document.getElementById('info').innerHTML = info.join(', ') || '(unknown)';
          map.getTarget().style.cursor = 'pointer';
        } else {
          document.getElementById('info').innerHTML = '&nbsp;';
          map.getTarget().style.cursor = '';
        }
      };

      map.on('pointermove', function(evt) {
        if (evt.dragging) {
          return;
        }
        var pixel = map.getEventPixel(evt.originalEvent);
        displayFeatureInfo(pixel);
      });

      map.on('click', function(evt) {
        displayFeatureInfo(evt.pixel);
      });
    </script>
  </body>
</html>