goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.geom.Point');
goog.require('ol.layer.Vector');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');


var count = 20000;
var features = new Array(count);
var e = 18000000;
for (var i = 0; i < count; ++i) {
  features[i] = new ol.Feature({
    'geometry': new ol.geom.Point(
        [2 * e * Math.random() - e, 2 * e * Math.random() - e]),
    'i': i,
    'size': 20
  });
}

var styles = {
  '10': [new ol.style.Style({
    image: new ol.style.Circle({
      radius: 5,
      fill: new ol.style.Fill({color: '#666666'}),
      stroke: new ol.style.Stroke({color: '#bada55', width: 1})
    })
  })],
  '20': [new ol.style.Style({
    image: new ol.style.Circle({
      radius: 10,
      fill: new ol.style.Fill({color: '#666666'}),
      stroke: new ol.style.Stroke({color: '#bada55', width: 1})
    })
  })]
};

var vectorSource = new ol.source.Vector({
  features: features
});
var vector = new ol.layer.Vector({
  source: vectorSource,
  style: function(feature, resolution) {
    return styles[feature.get('size')];
  }
});

var map = new ol.Map({
  renderer: exampleNS.getRendererFromQueryString(),
  layers: [vector],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

$(map.getViewport()).on('mousemove', function(e) {
  var pixel = map.getEventPixel(e.originalEvent);

  var hit = map.forEachFeatureAtPixel(pixel, function(feature, layer) {
    return true;
  });

  if (hit) {
    map.getTarget().style.cursor = 'pointer';
  } else {
    map.getTarget().style.cursor = '';
  }
});