使用圆点 openlayers 3 显示隐藏标记

Question

如何使用圆点（类似于 point1.distanceTo(point2)）显示隐藏标记（P 图标）

需要显示标记如果标记进入圆内，另一个将其隐藏（当前通过滑块改变圆半径）

// we change this on input change
var radius = 10;
  longitude = 400000;
  latitude = 300000;


var styleFunction = function() {
  return new ol.style.Style({
    image: new ol.style.Circle({
      radius: radius,
      stroke: new ol.style.Stroke({
        color: [51, 51, 51],
        width: 2
      }),
      fill: new ol.style.Fill({
        color: [51, 51, 51, .3]
      })
    })
  });
};

var update = function(value) {
 // $('#range').val() = value;
  radius = value;
  vectorLayer.setStyle(styleFunction);
 // $('#range').val(value)
 // document.getElementById('range').value=value;
}

var feature = new ol.Feature(new ol.geom.Point([longitude, latitude]));
var vectorLayer = new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [feature]
  }),
  style: styleFunction
});
 var rasterLayer = new ol.layer.Tile({
   source: new ol.source.TileJSON({
     url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.json',
     crossOrigin: ''
   })
 });

// icon marker start here

var iconFeature5 = new ol.Feature({
  geometry: new ol.geom.Point([longitude, latitude]),
  name: 'Missing Person',
  population: 4000,
  rainfall: 500
});

var vectorSource5 = new ol.source.Vector({
  features: [iconFeature5]
});

var vectorLayer5 = new ol.layer.Vector({
  source: vectorSource5
});

var iconStyle5 = new ol.style.Style({
  image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
    anchor: [0.5, 46],
    anchorXUnits: 'fraction',
    anchorYUnits: 'pixels',
    
    src: 'https://cloud.githubusercontent.com/assets/41094/2833021/7279fac0-cfcb-11e3-9789-24436486a8b1.png'
  }))
});
iconFeature5.setStyle(iconStyle5);

// 2nd marker

  longitude1 = 100000;
  latitude1 = 100000;
var iconFeature1 = new ol.Feature({
  geometry: new ol.geom.Point([longitude1, latitude1]),
  name: 'Missing Person',
  population: 4000,
  rainfall: 500
});

var vectorSource1 = new ol.source.Vector({
  features: [iconFeature1]
});

var vectorLayer1 = new ol.layer.Vector({
  source: vectorSource1
});

iconFeature1.setStyle(iconStyle5);



var map = new ol.Map({
  layers: [rasterLayer,vectorLayer,vectorLayer5,vectorLayer1],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [400000, 400000],
    zoom: 4
  })
});

html, body, #map {
  height: 100%;
  overflow: hidden;
}
.input {
  margin: 5px 0;
}

<script src="http://openlayers.org/en/v3.16.0/build/ol.js"></script>
<div class="input">
  <input type="range" id="range" min="10" max="50" onchange="update(this.value)">
  <input type="text" id="range" value="10">
</div>
<div id="map" class="map"></div>

Answer 1

由于您使用的是点而不是实际的圆几何，正如您所说的 distanceTo 可能是解决此问题的方法，因此您必须将其添加到更新函数中：

var wgs84Sphere = new ol.Sphere(6378137);

var update = function(value) {
 // $('#range').val() = value;
  radius = value;
  vectorLayer.setStyle(styleFunction);
  if(wgs84Sphere.haversineDistance(feature.getGeometry().getCoordinates(),iconFeature5.getGeometry().getCoordinates())<=radius){
      vectorLayer5.setVisible(true);
  }
  else{
      vectorLayer5.setVisible(false);
  }
  if(wgs84Sphere.haversineDistance(feature.getGeometry().getCoordinates(),iconFeature1.getGeometry().getCoordinates())<=radius){
      vectorLayer1.setVisible(true);
  }
  else{
      vectorLayer1.setVisible(false);
  }
}

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