70 lines
1.4 KiB
JavaScript
70 lines
1.4 KiB
JavaScript
goog.require('goog.functions');
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goog.require('ol.Map');
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goog.require('ol.Overlay');
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goog.require('ol.RendererHint');
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goog.require('ol.View2D');
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goog.require('ol.format.GeoJSON');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.Vector');
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goog.require('ol.symbol');
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// build up some GeoJSON features
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var count = 20000;
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var features = new Array(count);
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var e = 18000000;
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for (var i = 0; i < count; ++i) {
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features[i] = {
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type: 'Feature',
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properties: {
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i: i,
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size: i % 2 ? 10 : 20
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},
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geometry: {
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type: 'Point',
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coordinates: [
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2 * e * Math.random() - e, 2 * e * Math.random() - e
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]
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}
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};
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}
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var vectorSource = new ol.source.Vector();
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new ol.format.GeoJSON().readObject({
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type: 'FeatureCollection',
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features: features
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}, vectorSource.addFeature, vectorSource);
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var styleFunction = goog.functions.constant({
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image: ol.symbol.renderCircle(
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5,
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{
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color: '#666666'
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},
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{
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color: '#bada55',
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width: 1
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})
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});
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var vector = new ol.layer.Vector({
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source: vectorSource,
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styleFunction: styleFunction
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});
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var popup = new ol.Overlay({
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element: document.getElementById('popup')
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});
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var map = new ol.Map({
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layers: [vector],
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renderer: ol.RendererHint.CANVAS,
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target: 'map',
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view: new ol.View2D({
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center: [0, 0],
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zoom: 2
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}),
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overlays: [popup]
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});
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