如何在Google Maps API上的标记周围添加圆圈

Question

这是我用来在Google地图的多个位置上显示标记的代码。 我要添加一个标记，并在标记周围添加一个5公里的圆圈。

我尝试添加此代码块而没有运气：

var circle = new google.maps.Circle({
center:position, 
radius: radius, 
fillColor: "#0000FF", 
fillOpacity: 0.1, 
map: map, 
strokeColor: "#FFFFFF", 
strokeOpacity: 0.1, 
strokeWeight: 2 
});

这是下面的完整代码，这是一个jsfiddle供参考

var center = "Vilnius, Lithuania";
var locations = [
  ['Tuskulėnų g. 20, Vilnius 09211, Lithuania', "some info"],
  ['Stumbrų g. 21, Vilnius 08101, Lithuania', "more information"],
  ['Kalvarijų g. 55, Vilnius 09317, Lithuania', "blah, blah"],
  ['Birželio 23-iosios g. 6, Vilnius 03204, Lithuania', "other information"],
  ['Teatro g. 6, Vilnius 03107, Lithuania', "to be determined"]
];


var geocoder;
var map;
var infoWin = new google.maps.InfoWindow();

function initialize() {
  geocoder = new google.maps.Geocoder();
  map = new google.maps.Map(
    document.getElementById("map_canvas"));
  // center and zoom map on "center" address
  geocoder.geocode({
    address: center
  }, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
      map.fitBounds(results[0].geometry.bounds);
    } else {
      alert("Geocode was not successful for the following reason: " + status);
    }
  });
  for (var i = 0; i < locations.length; i++) {
    codeAddress(locations[i], i);
  }

}

function codeAddress(location, i) {
  geocoder.geocode({
    'address': location[0]
  }, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
      map.setCenter(results[0].geometry.location);
      var marker = new google.maps.Marker({
        map: map,
        title: "marker " + i,
        position: results[0].geometry.location
      });
      google.maps.event.addListener(marker, 'click', function(evt) {
        infoWin.setContent(location[0] + "<br>" + location[1]);
        infoWin.open(map, this);
      })


//i added this block
var circle = new google.maps.Circle({
center:position, 
radius: radius, 
fillColor: "#0000FF", 
fillOpacity: 0.1, 
map: map, 
strokeColor: "#FFFFFF", 
strokeOpacity: 0.1, 
strokeWeight: 2 
});
//end of block addition

    } else {
      alert("Geocode was not successful for the following reason: " + status);
    }
  });
}

google.maps.event.addDomListener(window, "load", initialize);

更新

这是我从控制台得到的

radius is not defined

Answer 1

您只需定义radius和position变量，例如：

var radius = 1000;
var position = marker.getPosition();

为了实现缩放，您可以使用map.setZoom(); ，将其添加到setCenter之后，例如：

map.setCenter(results[0].geometry.location);
map.setZoom(5);

工作提琴 。

---

代码段：

 var center = "Vilnius, Lithuania"; var locations = [ ['Tuskulėnų g. 20, Vilnius 09211, Lithuania', "some info"], ['Stumbrų g. 21, Vilnius 08101, Lithuania', "more information"], ['Kalvarijų g. 55, Vilnius 09317, Lithuania', "blah, blah"], ['Birželio 23-iosios g. 6, Vilnius 03204, Lithuania', "other information"], ['Teatro g. 6, Vilnius 03107, Lithuania', "to be determined"] ]; var geocoder; var map; var infoWin = new google.maps.InfoWindow(); function codeAddress(location, i) { geocoder.geocode({ 'address': location[0] }, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { map.setCenter(results[0].geometry.location); map.setZoom(5); var marker = new google.maps.Marker({ map: map, title: "marker " + i, position: results[0].geometry.location }); google.maps.event.addListener(marker, 'click', function(evt) { infoWin.setContent(location[0] + "<br>" + location[1]); infoWin.open(map, this); }) var radius = 1000; var position = marker.getPosition(); var circle = new google.maps.Circle({ center: position, radius: radius, fillColor: "#0000FF", fillOpacity: 0.1, map: map, strokeColor: "#FFFFFF", strokeOpacity: 0.1, strokeWeight: 2 }); } else { alert("Geocode was not successful for the following reason: " + status); } }); } google.maps.event.addDomListener(window, "load", function() { geocoder = new google.maps.Geocoder(); map = new google.maps.Map( document.getElementById("map_canvas")); // center and zoom map on "center" address geocoder.geocode({ address: center }, function(results, status) { if (status == google.maps.GeocoderStatus.OK) { google.maps.event.addListenerOnce(map, 'bounds_changed', function() { map.setZoom(map.getZoom() + 3); }); map.fitBounds(results[0].geometry.bounds); } else { alert("Geocode was not successful for the following reason: " + status); } }); for (var i = 0; i < locations.length; i++) { codeAddress(locations[i], i); } }); 

 html, body, #map_canvas { height: 100%; width: 100%; } 

 <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js"></script> <div id="map_canvas"></div>