1 | goog.require('ol.Feature');
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2 | goog.require('ol.Map');
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3 | goog.require('ol.View');
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4 | goog.require('ol.geom.Point');
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5 | goog.require('ol.layer.Vector');
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6 | goog.require('ol.source.Vector');
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7 | goog.require('ol.style.Icon');
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8 | goog.require('ol.style.Style');
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9 |
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10 |
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11 | var iconInfo = [{
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12 | offset: [0, 0],
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13 | opacity: 1.0,
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14 | rotateWithView: true,
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15 | rotation: 0.0,
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16 | scale: 1.0,
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17 | size: [55, 55]
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18 | }, {
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19 | offset: [110, 86],
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20 | opacity: 0.75,
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21 | rotateWithView: false,
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22 | rotation: Math.PI / 2.0,
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23 | scale: 1.25,
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24 | size: [55, 55]
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25 | }, {
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26 | offset: [55, 0],
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27 | opacity: 0.5,
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28 | rotateWithView: true,
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29 | rotation: Math.PI / 3.0,
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30 | scale: 1.5,
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31 | size: [55, 86]
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32 | }, {
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33 | offset: [212, 0],
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34 | opacity: 1.0,
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35 | rotateWithView: true,
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36 | rotation: 0.0,
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37 | scale: 1.0,
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38 | size: [44, 44]
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39 | }];
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40 |
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41 | var i;
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42 |
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43 | var iconCount = iconInfo.length;
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44 | var icons = new Array(iconCount);
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45 | for (i = 0; i < iconCount; ++i) {
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46 | var info = iconInfo[i];
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47 | icons[i] = new ol.style.Icon({
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48 | offset: info.offset,
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49 | opacity: info.opacity,
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50 | rotateWithView: info.rotateWithView,
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51 | rotation: info.rotation,
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52 | scale: info.scale,
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53 | size: info.size,
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54 | crossOrigin: 'anonymous',
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55 | src: 'data/Butterfly.png'
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56 | });
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57 | }
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58 |
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59 | var featureCount = 50000;
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60 | var features = new Array(featureCount);
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61 | var feature, geometry;
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62 | var e = 25000000;
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63 | for (i = 0; i < featureCount; ++i) {
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64 | geometry = new ol.geom.Point(
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65 | [2 * e * Math.random() - e, 2 * e * Math.random() - e]);
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66 | feature = new ol.Feature(geometry);
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67 | feature.setStyle(
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68 | new ol.style.Style({
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69 | image: icons[i % (iconCount - 1)]
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70 | })
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71 | );
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72 | features[i] = feature;
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73 | }
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74 |
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75 | var vectorSource = new ol.source.Vector({
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76 | features: features
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77 | });
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78 | var vector = new ol.layer.Vector({
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79 | source: vectorSource
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80 | });
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81 |
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82 | var map = new ol.Map({
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83 | renderer: ('webgl'),
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84 | layers: [vector],
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85 | target: document.getElementById('map'),
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86 | view: new ol.View({
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87 | center: [0, 0],
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88 | zoom: 5
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89 | })
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90 | });
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91 |
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92 | var overlayFeatures = [];
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93 | for (i = 0; i < featureCount; i += 30) {
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94 | var clone = features[i].clone();
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95 | clone.setStyle(null);
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96 | overlayFeatures.push(clone);
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97 | }
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98 |
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99 | new ol.layer.Vector({
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100 | map: map,
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101 | source: new ol.source.Vector({
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102 | features: overlayFeatures
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103 | }),
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104 | style: new ol.style.Style({
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105 | image: icons[iconCount - 1]
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106 | })
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107 | });
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108 |
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109 | map.on('click', function(evt) {
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110 | var info = document.getElementById('info');
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111 | info.innerHTML =
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112 | 'Hold on a second, while I catch those butterflies for you ...';
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113 |
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114 | window.setTimeout(function() {
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115 | var features = [];
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116 | map.forEachFeatureAtPixel(evt.pixel, function(feature) {
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117 | features.push(feature);
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118 | return false;
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119 | });
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120 |
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121 | if (features.length === 1) {
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122 | info.innerHTML = 'Got one butterfly';
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123 | } else if (features.length > 1) {
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124 | info.innerHTML = 'Got ' + features.length + ' butterflies';
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125 | } else {
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126 | info.innerHTML = 'Couldn\'t catch a single butterfly';
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127 | }
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128 | }, 1);
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129 | });
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130 |
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131 | map.on('pointermove', function(evt) {
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132 | if (evt.dragging) {
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133 | return;
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134 | }
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135 | var pixel = map.getEventPixel(evt.originalEvent);
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136 | var hit = map.hasFeatureAtPixel(pixel);
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137 | map.getTarget().style.cursor = hit ? 'pointer' : '';
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138 | });
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