Google Map-获取标记的位置

时间:2019-05-05 08:49:34

标签: javascript google-maps google-maps-markers

我有2个多边形{ "Country": "01", "Location": "09", "City": "156" }{ "Country": "01", "Location": "09", "City": "160" }

我在地图上创建了centerMarker固定中心。当用户拖动或更改地图中心时。我将获得centerMarker的职位。

google.maps.event.addListener(map,'idle', function() {
    console.log(map.getCenter().lat());
    console.log(map.getCenter().lng());
  });
  $('<div/>').addClass('centerMarker').appendTo(map.getDiv())

如何检查位于centerMarker"City": "160"上的"City": "156"

我的完整代码

function initMap() {
    var x = new google.maps.LatLng(11.200845,106.5746263,17);
    var data = 
{  
   "type":"FeatureCollection",
   "name":"gadm36_VNM_3",
   "crs":{  
      "type":"name",
      "properties":{  
         "name":"urn:ogc:def:crs:OGC:1.3:CRS84"
      }
   },
   "features":[  
      {  
         "type":"Feature",
         "properties":{  
            "Country":"01",
            "Location":"09",
            "City":"156"
         },
         "geometry":{  
            "type":"MultiPolygon",
            "coordinates":[  
               [  
                  [  
                     [  
                        106.773910522460994,
                        11.140744209289601
                     ],
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                        106.764717102050994,
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                     ],
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                        106.764862060547003,
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                     ],
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                        106.763977050780994,
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                     ],
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                        106.762413024902003,
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                     ],
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                     ],
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                        106.760833740234006,
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                     ],
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                        106.75707244873,
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                     ],
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                     ],
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            ]
         }
      },
      {  
         "type":"Feature",
         "properties":{  
            "Country":"01",
            "Location":"09",
            "City":"160"
         },
         "geometry":{  
            "type":"MultiPolygon",
            "coordinates":[  
               [  
                  [  
                     [  
                        106.908004760742003,
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                     ],
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                  ]
               ]
            ]
         }
      }

   ]
};
    var map = new google.maps.Map(document.getElementById("map"),{
    center: x,
        zoom: 12,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });
  google.maps.event.addListener(map,'idle', function() {
    console.log(map.getCenter().lat());
    console.log(map.getCenter().lng());
  });
  $('<div/>').addClass('centerMarker').appendTo(map.getDiv())

    map.data.addGeoJson(data);
}

1 个答案:

答案 0 :(得分:1)

为了弄清楚地图的中心是否位于城市的多边形内,可以使用Maps JavaScript API的几何库。几何库提供了方法containsLocation(point, polygon),这可能对您有用。看看文档

https://developers.google.com/maps/documentation/javascript/reference/geometry#poly

首先,您必须在载入了Maps JavaScript API的script标签中包括几何图形库,并在Maps JavaScript API的URL中添加&libraries=geometry。其次,您使用数据层的GeoJSON对象创建城市的多边形,因此必须将数据层的多面体转换为google.maps.Polygons对象,才能使用上述方法containsLocation(point, polygon)

我建议调查文档以了解如何转换这些对象

https://developers.google.com/maps/documentation/javascript/reference/data#Data.MultiPolygon

这里是一个示例代码,该示例代码转换了Multipolygons,并使用containsLocation(point, polygon)检查地图中心是否在城市多边形内

var map;
  function initMap() {
    var x = new google.maps.LatLng(11.200845,106.5746263,17);
    var data = 
{  
   "type":"FeatureCollection",
   "name":"gadm36_VNM_3",
   "crs":{  
      "type":"name",
      "properties":{  
         "name":"urn:ogc:def:crs:OGC:1.3:CRS84"
      }
   },
   "features":[  
      {  
         "type":"Feature",
         "properties":{  
            "Country":"01",
            "Location":"09",
            "City":"156"
         },
         "geometry":{  
            "type":"MultiPolygon",
            "coordinates":[  
               [  
                  [  
                     [  
                        106.773910522460994,
                        11.140744209289601
                     ],
                     [  
                        106.764717102050994,
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                     ],
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                        106.764862060547003,
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                     ],
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                     ],
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                     ],
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                     ],
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      {  
         "type":"Feature",
         "properties":{  
            "Country":"01",
            "Location":"09",
            "City":"160"
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   ]
};
    map = new google.maps.Map(document.getElementById("map"),{
        center: x,
        zoom: 12,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });
    var centerMarker = new google.maps.Marker({
    	position: x,
      map: map
    });
    
    var features = map.data.addGeoJson(data);
    var mapPolies = new Map();
    features.forEach(function(feature) {
    	var city = feature.getProperty("City");
      var geom = feature.getGeometry();
      var polygons = geom.getArray();
      var polys = [];
      polygons.forEach(function(polygon) {
        var paths = [];
        var linearRings = polygon.getArray();
        linearRings.forEach(function(linearRing){
          var coords = linearRing.getArray();
          paths.push(coords);
        });
        var poly = new google.maps.Polygon({
          paths: paths,
          map: null,
          visible: false
        });
        polys.push(poly);
      });
      mapPolies.set(city, polys);
    });
    google.maps.event.addListener(map,'idle', function() {
        //console.log(map.getCenter().lat());
        //console.log(map.getCenter().lng());
        centerMarker.setPosition(map.getCenter());
        
        for (var entry of mapPolies.entries()) {
        	entry[1].forEach(function(polygon) {
          	var inside = google.maps.geometry.poly.containsLocation(map.getCenter(), polygon);
            if (inside) {
              console.log(`Map center inside polygon of ${entry[0]} city`);
            }
          });
        }
    });
}
#map {
  height: 100%;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDztlrk_3CnzGHo7CFvLFqE_2bUKEq1JEU&callback=initMap&libraries=geometry" async defer></script>

我希望这会有所帮助!