72 lines
2.4 KiB
JavaScript
72 lines
2.4 KiB
JavaScript
goog.require('ol.Attribution');
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.format.MVT');
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goog.require('ol.layer.VectorTile');
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goog.require('ol.proj');
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goog.require('ol.source.VectorTile');
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goog.require('ol.style.Fill');
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goog.require('ol.style.Icon');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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goog.require('ol.style.Text');
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goog.require('ol.tilegrid.TileGrid');
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var key = 'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiRk1kMWZaSSJ9.E5BkluenyWQMsBLsuByrmg';
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// For how many zoom levels do we want to use the same vector tiles?
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// 1 means "use tiles from all zoom levels". 2 means "use the same tiles for 2
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// subsequent zoom levels".
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var reuseZoomLevels = 2;
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// Offset of loaded tiles from web mercator zoom level 0.
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// 0 means "At map zoom level 0, use tiles from zoom level 0". 1 means "At map
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// zoom level 0, use tiles from zoom level 1".
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var zoomOffset = 1;
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// Calculation of tile urls
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var resolutions = [];
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for (var z = zoomOffset / reuseZoomLevels; z <= 22 / reuseZoomLevels; ++z) {
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resolutions.push(156543.03392804097 / Math.pow(2, z * reuseZoomLevels));
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}
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function tileUrlFunction(tileCoord) {
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return ('http://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/' +
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'{z}/{x}/{y}.vector.pbf?access_token=' + key)
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.replace('{z}', String(tileCoord[0] * reuseZoomLevels + zoomOffset))
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.replace('{x}', String(tileCoord[1]))
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.replace('{y}', String(-tileCoord[2] - 1))
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.replace('{a-d}', 'abcd'.substr(
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((tileCoord[1] << tileCoord[0]) + tileCoord[2]) % 4, 1));
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}
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var map = new ol.Map({
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layers: [
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new ol.layer.VectorTile({
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preload: Infinity,
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source: new ol.source.VectorTile({
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attributions: '© <a href="https://www.mapbox.com/map-feedback/">Mapbox</a> ' +
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'© <a href="http://www.openstreetmap.org/copyright">' +
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'OpenStreetMap contributors</a>',
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format: new ol.format.MVT(),
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tileGrid: new ol.tilegrid.TileGrid({
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extent: ol.proj.get('EPSG:3857').getExtent(),
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resolutions: resolutions
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}),
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tilePixelRatio: 16,
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tileUrlFunction: tileUrlFunction
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}),
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style: createMapboxStreetsV6Style()
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})
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],
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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minZoom: 1,
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zoom: 2
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})
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});
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// ol.style.Fill, ol.style.Icon, ol.style.Stroke, ol.style.Style and
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// ol.style.Text are required for createMapboxStreetsV6Style()
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