openlayers/examples/osm-vector-tiles.js

goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.format.TopoJSON');
goog.require('ol.layer.VectorTile');
goog.require('ol.proj');
goog.require('ol.source.VectorTile');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');

var key = 'vector-tiles-5eJz6JX';

var roadStyleCache = {};
var roadColor = {
  'major_road': '#776',
  'minor_road': '#ccb',
  'highway': '#f39'
};
var buildingStyle = new ol.style.Style({
  fill: new ol.style.Fill({
    color: '#666',
    opacity: 0.4
  }),
  stroke: new ol.style.Stroke({
    color: '#444',
    width: 1
  })
});
var waterStyle = new ol.style.Style({
  fill: new ol.style.Fill({
    color: '#9db9e8'
  })
});
var roadStyle = function(feature) {
  var kind = feature.get('kind');
  var railway = feature.get('railway');
  var sort_key = feature.get('sort_key');
  var styleKey = kind + '/' + railway + '/' + sort_key;
  var style = roadStyleCache[styleKey];
  if (!style) {
    var color, width;
    if (railway) {
      color = '#7de';
      width = 1;
    } else {
      color = roadColor[kind];
      width = kind == 'highway' ? 1.5 : 1;
    }
    style = new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: color,
        width: width
      }),
      zIndex: sort_key
    });
    roadStyleCache[styleKey] = style;
  }
  return style;
};

var map = new ol.Map({
  layers: [
    new ol.layer.VectorTile({
      source: new ol.source.VectorTile({
        attributions: '© OpenStreetMap contributors, Who’s On First, ' +
            'Natural Earth, and openstreetmapdata.com',
        format: new ol.format.TopoJSON({
          layerName: 'layer',
          layers: ['water', 'roads', 'buildings']
        }),
        maxZoom: 19,
        url: 'https://tile.mapzen.com/mapzen/vector/v1/all/{z}/{x}/{y}.topojson?api_key=' + key
      }),
      style: function(feature, resolution) {
        switch (feature.get('layer')) {
          case 'water': return waterStyle;
          case 'roads': return roadStyle(feature);
          case 'buildings': return (resolution < 10) ? buildingStyle : null;
          default: return null;
        }
      }
    })
  ],
  target: 'map',
  view: new ol.View({
    center: ol.proj.fromLonLat([-74.0064, 40.7142]),
    maxZoom: 19,
    zoom: 15
  })
});