如何在Google地图上显示圈子？

Question

I know that this question is asked frequently, but I have a problem to show circles on my Google Map.

Actually, I get markers on my maps.

 import htmlTemplate from './activityDetails.html'; export default { template: htmlTemplate, require: { parent: '^main' }, bindings: { activity: '<' }, controller: function controller(MapsService, GeolocationService, NgMap, $log) { 'ngInject'; this.$onInit = () => { // Load Google Maps API script MapsService.loadGoogleApi().then(() => { this.loaded = true; NgMap.getMap().then((map) => { this.map = map; $log.info('activityDetails component init'); this.activity.lat = this.activity.location.coordinates[0]; this.activity.lng = this.activity.location.coordinates[1]; // Save each marker in its user object to facilitate hover this.createMarkers(); // Set geolocation notification hook this.setGeolocationHook(); }); }); }; } }; 

 <div class="block-map col m6"> <ng-map class="map" center="{{$ctrl.activity.lat}}, {{$ctrl.activity.lng}}" zoom="16"> <marker position="{{$ctrl.activity.lat}}, {{$ctrl.activity.lng}}"></marker> </ng-map> </div> 

My question is: How to replace my markers by circles?

Thanks a lot !

Answer 1

You can add "Circles" to your map as described in the official API documentation.

https://developers.google.com/maps/documentation/javascript/examples/circle-simple

Important is this part:

var cityCircle = new google.maps.Circle({
  strokeColor: '#FF0000',
  strokeOpacity: 0.8,
  strokeWeight: 2,
  fillColor: '#FF0000',
  fillOpacity: 0.35,
  map: map,
  center: citymap[city].center,
  radius: Math.sqrt(citymap[city].population) * 100
});

It's pretty straight forward.

Instead of citymap[city].center you need to pass your lat/lang object, for example {lat: 41.878, lng: -87.629} .

For the radius you can pass any number value. In the maps demo they used the population.

For NG-Map:

<shape name="circle" ng-repeat="circle in vm.circles" no-watcher="true"
  stroke-color="#FF0000"
  stroke-opacity="0.8"
  stroke-weight="2"
  fill-color="#FF0000"
  fill-opacity="0.35"
  center="{{circle.position}}"
  radius="{{circle.radius}}">
</shape>