60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
import MVT from '../src/ol/format/MVT.js';
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import Map from '../src/ol/Map.js';
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import TileGrid from '../src/ol/tilegrid/TileGrid.js';
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import VectorTileLayer from '../src/ol/layer/VectorTile.js';
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import VectorTileSource from '../src/ol/source/VectorTile.js';
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import View from '../src/ol/View.js';
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import {Fill, Icon, Stroke, Style, Text} from '../src/ol/style.js';
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import {get as getProjection} from '../src/ol/proj.js';
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const key =
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'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2t0cGdwMHVnMGdlbzMxbDhwazBic2xrNSJ9.WbcTL9uj8JPAsnT9mgb7oQ';
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// Calculation of resolutions that match zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
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const resolutions = [];
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for (let i = 0; i <= 8; ++i) {
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resolutions.push(156543.03392804097 / Math.pow(2, i * 2));
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}
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// Calculation of tile urls for zoom levels 1, 3, 5, 7, 9, 11, 13, 15.
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function tileUrlFunction(tileCoord) {
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return (
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'https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/' +
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'{z}/{x}/{y}.vector.pbf?access_token=' +
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key
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)
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.replace('{z}', String(tileCoord[0] * 2 - 1))
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.replace('{x}', String(tileCoord[1]))
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.replace('{y}', String(tileCoord[2]))
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.replace(
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'{a-d}',
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'abcd'.substr(((tileCoord[1] << tileCoord[0]) + tileCoord[2]) % 4, 1)
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);
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}
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const map = new Map({
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layers: [
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new VectorTileLayer({
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source: new VectorTileSource({
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attributions:
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'© <a href="https://www.mapbox.com/map-feedback/">Mapbox</a> ' +
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'© <a href="https://www.openstreetmap.org/copyright">' +
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'OpenStreetMap contributors</a>',
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format: new MVT(),
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tileGrid: new TileGrid({
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extent: getProjection('EPSG:3857').getExtent(),
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resolutions: resolutions,
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tileSize: 512,
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}),
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tileUrlFunction: tileUrlFunction,
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}),
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style: createMapboxStreetsV6Style(Style, Fill, Stroke, Icon, Text),
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}),
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],
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target: 'map',
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view: new 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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