92 lines
2.2 KiB
JavaScript
92 lines
2.2 KiB
JavaScript
// NOCOMPILE
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.format.GeoJSON');
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goog.require('ol.source.OSM');
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goog.require('ol.source.VectorTile');
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goog.require('ol.layer.Tile');
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goog.require('ol.layer.VectorTile');
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goog.require('ol.tilegrid');
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goog.require('ol.proj.Projection');
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var replacer = function(key, value) {
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if (value.geometry) {
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var type;
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var rawType = value.type;
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var geometry = value.geometry;
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if (rawType === 1) {
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type = geometry.length === 1 ? 'Point' : 'MultiPoint';
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} else if (rawType === 2) {
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type = geometry.length === 1 ? 'LineString' : 'MultiLineString';
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} else if (rawType === 3) {
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type = geometry.length === 1 ? 'Polygon' : 'MultiPolygon';
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}
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return {
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'type': 'Feature',
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'geometry': {
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'type': type,
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'coordinates': geometry.length == 1 ? geometry : [geometry]
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},
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'properties': value.tags
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};
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} else {
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return value;
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}
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};
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var tilePixels = new ol.proj.Projection({
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code: 'TILE_PIXELS',
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units: 'tile-pixels'
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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.Tile({
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source: new ol.source.OSM()
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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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zoom: 2
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})
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});
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var url = 'data/geojson/countries.geojson';
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fetch(url).then(function(response) {
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return response.json();
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}).then(function(json) {
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var tileIndex = geojsonvt(json, {
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extent: 4096,
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debug: 1
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});
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var vectorSource = new ol.source.VectorTile({
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format: new ol.format.GeoJSON(),
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tileGrid: ol.tilegrid.createXYZ(),
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tilePixelRatio: 16,
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tileLoadFunction: function(tile) {
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var format = tile.getFormat();
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var tileCoord = tile.getTileCoord();
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var data = tileIndex.getTile(tileCoord[0], tileCoord[1], -tileCoord[2] - 1);
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var features = format.readFeatures(
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JSON.stringify({
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type: 'FeatureCollection',
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features: data ? data.features : []
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}, replacer));
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tile.setLoader(function() {
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tile.setFeatures(features);
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tile.setProjection(tilePixels);
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});
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},
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url: 'data:' // arbitrary url, we don't use it in the tileLoadFunction
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});
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var vectorLayer = new ol.layer.VectorTile({
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source: vectorSource
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});
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map.addLayer(vectorLayer);
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});
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