1 | goog.require('ol.Map');
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2 | goog.require('ol.View');
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3 | goog.require('ol.format.GeoJSON');
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4 | goog.require('ol.layer.Image');
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5 | goog.require('ol.layer.Tile');
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6 | goog.require('ol.layer.Vector');
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7 | goog.require('ol.source.ImageVector');
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8 | goog.require('ol.source.OSM');
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9 | goog.require('ol.source.Vector');
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10 | goog.require('ol.style.Fill');
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11 | goog.require('ol.style.Stroke');
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12 | goog.require('ol.style.Style');
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13 |
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14 |
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15 | var map = new ol.Map({
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16 | layers: [
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17 | new ol.layer.Tile({
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18 | source: new ol.source.OSM()
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19 | }),
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20 | new ol.layer.Image({
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21 | source: new ol.source.ImageVector({
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22 | source: new ol.source.Vector({
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23 | url: 'data/geojson/countries.geojson',
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24 | format: new ol.format.GeoJSON()
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25 | }),
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26 | style: new ol.style.Style({
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27 | fill: new ol.style.Fill({
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28 | color: 'rgba(255, 255, 255, 0.6)'
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29 | }),
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30 | stroke: new ol.style.Stroke({
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31 | color: '#319FD3',
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32 | width: 1
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33 | })
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34 | })
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35 | })
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36 | })
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37 | ],
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38 | target: 'map',
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39 | view: new ol.View({
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40 | center: [0, 0],
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41 | zoom: 1
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42 | })
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43 | });
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44 |
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45 | var featureOverlay = new ol.layer.Vector({
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46 | source: new ol.source.Vector(),
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47 | map: map,
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48 | style: new ol.style.Style({
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49 | stroke: new ol.style.Stroke({
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50 | color: '#f00',
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51 | width: 1
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52 | }),
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53 | fill: new ol.style.Fill({
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54 | color: 'rgba(255,0,0,0.1)'
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55 | })
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56 | })
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57 | });
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58 |
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59 | var highlight;
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60 | var displayFeatureInfo = function(pixel) {
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61 |
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62 | var feature = map.forEachFeatureAtPixel(pixel, function(feature) {
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63 | return feature;
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64 | });
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65 |
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66 | var info = document.getElementById('info');
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67 | if (feature) {
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68 | info.innerHTML = feature.getId() + ': ' + feature.get('name');
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69 | } else {
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70 | info.innerHTML = ' ';
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71 | }
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72 |
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73 | if (feature !== highlight) {
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74 | if (highlight) {
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75 | featureOverlay.getSource().removeFeature(highlight);
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76 | }
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77 | if (feature) {
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78 | featureOverlay.getSource().addFeature(feature);
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79 | }
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80 | highlight = feature;
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81 | }
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82 |
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83 | };
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84 |
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85 | map.on('pointermove', function(evt) {
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86 | if (evt.dragging) {
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87 | return;
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88 | }
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89 | var pixel = map.getEventPixel(evt.originalEvent);
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90 | displayFeatureInfo(pixel);
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91 | });
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92 |
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93 | map.on('click', function(evt) {
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94 | displayFeatureInfo(evt.pixel);
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95 | });
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