Google Maps JavaScript API v3 / 数据层 / MarkerClusterer

Question

你能帮我用 MarkerClustererPlus 创建标记集群吗？ 我加载数据：

layer = map.data.loadGeoJson('resources/data.geojson');

并且标记是可见的，但我不知道如何创建标记簇。 我是否必须将 data.geojson 文件解析为数组？谢谢。

function initialize() {
map = new google.maps.Map(document.getElementById('map'), mapOptions);
layer = map.data.loadGeoJson('resources/data.geojson');

map.data.setStyle({icon: icon});

map.data.addListener('click', function(event) {
var myHTML = event.feature.getProperty('name');
infobox.setContent("<div style='width:150px; text-align: center;'>"+myHTML+"</div>");
infobox.setPosition(event.feature.getGeometry().get());
infobox.setOptions({pixelOffset: new google.maps.Size(0,0)});
infobox.open(map);
});  

google.maps.event.addListener(map, "click", function(){
infobox.close();
});

map.mapTypes.set('map_style', styledMap);
map.setMapTypeId('map_style');
}
google.maps.event.addDomListener(window, 'load', initialize);

这是我的 GeoJson-File 的一个片段（这个片段和整个文件由 GeoJSONLint 测试。

{
"type": "FeatureCollection",
"icon": "resources/icon.png",
"features": [
{
"type": "Feature","properties": {"name":"Bielefeld"},
"geometry": {"type": "Point","coordinates":[8.528849, 52.030656]}
},
{
"type": "Feature","properties": {"name":"Herford"},
"geometry": {"type": "Point","coordinates":[8.676780, 52.118003]}
},
{
"type": "Feature","properties": {"name":"Guetersloh"},
"geometry": {"type": "Point","coordinates":[8.383353, 51.902917]}
}
]
}

Answer 1

1. 创建一个 MarkerClusterer 来管理标记。

   var markerClusterer = new MarkerClusterer();
   

2. 当数据层触发addfeature 事件时，添加每个标记。

   markerClusterer.addMarker(marker);
   

3. 隐藏数据层标记。

   map.data.setMap(null);
   

working jsfiddle

var markerClusterer = new MarkerClusterer();
function initialize() {
    var mapOptions = {
        center: new google.maps.LatLng(52, 8),
        zoom: 4
    };
    map = new google.maps.Map(document.getElementById('map'), mapOptions);

    markerClusterer.setMap(map);
    google.maps.event.addListener(map.data, 'addfeature', function (e) {
        if (e.feature.getGeometry().getType() === 'Point') {
            var marker = new google.maps.Marker({
                position: e.feature.getGeometry().get(),
                title: e.feature.getProperty('name'),
                map: map
            });
            // open the infoBox when the marker is clicked
            google.maps.event.addListener(marker, 'click', function (marker, e) {
                return function () {

                    var myHTML = e.feature.getProperty('name');
                    boxText.innerHTML = "<div style='text-align: center;'><b>" + myHTML + "</b></div>";
                    infobox.setPosition(e.feature.getGeometry().get());
                    infobox.setOptions({
                        pixelOffset: new google.maps.Size(0, 0)
                    });
                    infobox.open(map);
                };
            }(marker, e));
            markerClusterer.addMarker(marker);
            bounds.extend(e.feature.getGeometry().get());
            map.fitBounds(bounds);
            map.setCenter(e.feature.getGeometry().get());
        }
    });
    layer = map.data.addGeoJson(geoJson);
    map.data.setMap(null);
    google.maps.event.addListener(map, "click", function () {
        infobox.close();
    });
}

代码 sn-p：

var geoJson = {
  "type": "FeatureCollection",
  "features": [{
    "type": "Feature",
    "properties": {
      "name": "Bielefeld"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.528849, 52.030656]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Herford"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.676780, 52.118003]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Guetersloh"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.383353, 51.902917]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Guetersloh2"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.38, 51.9]
    }
  }]
};
var map = null;
var bounds = new google.maps.LatLngBounds();

var boxText = document.createElement("div");
boxText.style.cssText = "border: 1px solid black; margin-top: 8px; background: yellow; padding: 5px;";
var infobox = new InfoBox({
  content: boxText,
  disableAutoPan: false,
  maxWidth: 0,
  pixelOffset: new google.maps.Size(-140, 0),
  zIndex: null,
  boxStyle: {
    background: "url('tipbox.gif') no-repeat",
    opacity: 0.75,
    width: "280px"
  },
  closeBoxMargin: "10px 2px 2px 2px",
  closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif",
  infoBoxClearance: new google.maps.Size(1, 1),
  isHidden: false,
  pane: "floatPane",
  enableEventPropagation: false
});

var markerClusterer = new MarkerClusterer(null, null, {
  imagePath: "https://cdn.rawgit.com/googlemaps/v3-utility-library/master/markerclustererplus/images/m"
});

function initialize() {
  var mapOptions = {
    center: new google.maps.LatLng(52, 8),
    zoom: 4
  };
  map = new google.maps.Map(document.getElementById('map'), mapOptions);

  markerClusterer.setMap(map);
  google.maps.event.addListener(map.data, 'addfeature', function(e) {
    if (e.feature.getGeometry().getType() === 'Point') {
      var marker = new google.maps.Marker({
        position: e.feature.getGeometry().get(),
        title: e.feature.getProperty('name'),
        map: map
      });
      google.maps.event.addListener(marker, 'click', function(marker, e) {
        return function() {

          var myHTML = e.feature.getProperty('name');
          boxText.innerHTML = "<div style='text-align: center;'><b>" + myHTML + "</b></div>";
          infobox.setPosition(e.feature.getGeometry().get());
          infobox.setOptions({
            pixelOffset: new google.maps.Size(0, 0)
          });
          infobox.open(map);
        };
      }(marker, e));
      markerClusterer.addMarker(marker);
      bounds.extend(e.feature.getGeometry().get());
      map.fitBounds(bounds);
      map.setCenter(e.feature.getGeometry().get());
    }
  });
  layer = map.data.addGeoJson(geoJson);
  map.data.setMap(null);
  google.maps.event.addListener(map, "click", function() {
    infobox.close();
  });
}
google.maps.event.addDomListener(window, 'load', initialize);

#map {
  width: 500px;
  height: 500px;
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<script src="https://cdn.rawgit.com/googlemaps/v3-utility-library/master/infobox/src/infobox.js"></script>
<script src="https://cdn.rawgit.com/googlemaps/v3-utility-library/master/markerclustererplus/src/markerclusterer.js"></script>
<div id="map"></div>

Answer 2

相当老的问题，但不再需要绕道添加常规标记并从数据层中清除它们（特别是如果您需要稍后在编辑地图后再次将地图内容作为 GeoJSON 获取）。

您可以使用https://github.com/Connum/data-layer-clusterer，我刚刚对其进行了增强，使其也适用于 LineString 和 Polygon 功能。

这是一个工作示例：

window.initMap = function() {
  map = new google.maps.Map(document.getElementById('map'), {
  center: {lat: 49.0192242, lng: 8.4051448},
  zoom: 13,
  scaleControl: false,
  streetViewControl: false,
  rotateControl: false,
  });

  var s = document.createElement( 'script' );
  s.setAttribute( 'src', 'https://cdn.rawgit.com/Connum/data-layer-clusterer/master/src/datalayerclusterer.js' );
  s.async = false;
  document.head.appendChild( s );
  s.onload = function() {
var cluster = new DataLayerClusterer({
"map": map
  });

  cluster.addGeoJson({
"type": "FeatureCollection",
"features": [
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.404455900017638,
  49.013533476349956
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.401044130150694,
  49.01396272155595
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.400035619561095,
  49.01183053267183
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.40565752965631,
  49.01064125233564
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.402932405297179,
  49.01073977367939
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.403726339165587,
  49.01247793961102
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.404820680443663,
  49.01244275466763
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.404724120919127,
  49.01104237373055
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.403586864296813,
  49.011105708392215
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.409692287095822,
  49.012400532702735
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.411816596635617,
  49.014638247499114
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.409027099260129,
  49.017537275583216
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.398555755265988,
  49.01670698867642
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.396946429857053,
  49.0123160886655
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.39379215205554,
  49.00865670946874
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.411065578111447,
  49.00868485956599
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.413211345323361,
  49.01026123961204
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.400143623002805,
  49.007558843262004
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.400422572740354,
  49.00857225908148
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.403812884935178,
  49.007882575557474
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.407074451097287,
  49.007404014028836
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.407546519883908,
  49.00957157948308
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.407310485490598,
  49.013976795106586
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.40351247752551,
  49.017354332200135
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.404177665361203,
  49.019043014809284
]
  }
},
{
  "type": "Feature",
  "geometry": {
"type": "Point",
"coordinates": [
  8.402332305558957,
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]
  }
},
{
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"type": "Point",
"coordinates": [
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]
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},
{
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]
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},
{
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]
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},
{
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]
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{
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]
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{
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{
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{
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{
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{
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{
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]
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{
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{
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]
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},
{
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},
{
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]
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
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},
{
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{
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<div id="map"></div>

Answer 3

无法通过 API 访问为数据层创建的形状，但您必须具有对标记的引用才能将它们添加到集群器中。

可能的解决方案：

观察数据的addfeature-事件并创建自己的标记。为数据层创建的标记隐藏（通过 visible 样式设置为 false 或在以后不需要访问时完全删除该功能）

例子：

 var mc=new MarkerClusterer(map);

 map.data.addListener('addfeature',function(e){
  var geo=  e.feature.getGeometry();

  if(geo.getType()==='Point'){

    mc.addMarker(new google.maps.Marker({position:geo.get(),
                                         title   :e.feature.getProperty('name')}));
    map.data.remove(e.feature);
  }
 });

演示：http://jsfiddle.net/doktormolle/myuua77p/

当然，这种解决方案会产生一些开销。当 FeatureCollection 中只有点时，您最好自己解析 geoJSON，而不是使用数据层