Google Map Javascript: How to show infowindow only on boundry of geojson city layer

Question

Currently, InfoWindow display on entire layer, but i need InfoWindow display only when I hover on boundry of city layer as displayed in image enter image description here

var cityLayer = new google.maps.Data();
cityLayer.loadGeoJson('laughlin.json');
cityLayer.setStyle({  fillColor: "#f6b234",  fillOpacity:0.4,  strokeColor: "#f6b234",  strokeOpacity:0.8,  strokeWeight: 4,});
cityLayer.setMap(regionMap);
google.maps.event.addListener(cityLayer, 'mouseover', function(eve) {
infowindow.setContent('<div><strong>Laughlin</strong></div>');
if (google.maps.geometry.poly.isLocationOnEdge(eve.latLng, cityLayer, 10e-4)) {    infowindow.setPosition(eve.latLng);
infowindow.open(regionMap, this); }
});

//laughlin.json file content {"type": "FeatureCollection","crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::4269" } },"features": [{ "type": "Feature", "properties": { "STATEFP": "32", "PLACEFP": "41000", "PLACENS": "02408587", "GEOID": "3241000", "NAME": "Laughlin","NAMELSAD": "Laughlin CDP", "LSAD": "57", "CLASSFP": "U1", "PCICBSA": "N", "PCINECTA": "N", "MTFCC": "G4210", "FUNCSTAT": "S", "ALAND": 228081857.000000, "AWATER": 3503460.000000, "INTPTLAT": "+35.1485812", "INTPTLON": "-114.7375884" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -114.853371, 35.192431 ], [ -114.852957, 35.192482 ], [ -114.852547, 35.192491 ], [ -114.852039, 35.192457 ], [ -114.851455, 35.192353 ], [ -114.848023, 35.191709 ], [ -114.84182, 35.19068 ], [ -114.838766, 35.190057 ], [ -114.831753, 35.188686 ], [ -114.82954, 35.188218 ], [ -114.826735, 35.187345 ], [ -114.814049, 35.183106 ], [ -114.808265, 35.180993 ], [ -114.803165, 35.179287 ], [ -114.801703, 35.178798 ], [ -11 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Answer 1

You can use the isLocationOnEdge function provided by Google Maps API.

It has the following syntax :

isLocationOnEdge(point:LatLng, poly:Polygon|Polyline, tolerance?:number)

You can change the tolerance level as per your requirements.

JS fiddle : https://jsfiddle.net/joysonds/dr1m7xvb/

function initMap() {
      map = new google.maps.Map(document.getElementById('map'), {
          center: {lat: 25.774, lng: -80.190},
         zoom: 12
     });


   // Define the LatLng coordinates for the polygon's path.
      var triangleCoords = [
        {lat: 25.774, lng: -80.190},
        {lat: 18.466, lng: -66.118},
        {lat: 32.321, lng: -64.757},
        {lat: 25.774, lng: -80.190}
      ];

      // Construct the polygon.
      var bermudaTriangle = new google.maps.Polygon({
        paths: triangleCoords,
        strokeColor: '#FF0000',
        strokeOpacity: 0.8,
        strokeWeight: 2,
        fillColor: '#FF0000',
        fillOpacity: 0.35
      });
      bermudaTriangle.setMap(map);

    var infowindow = new google.maps.InfoWindow({content:"Test", maxWidth:200, disableAutoPan:true });

     google.maps.event.addListener(bermudaTriangle, 'click', function(event) {
          if (google.maps.geometry.poly.isLocationOnEdge(event.latLng, bermudaTriangle, 10e-4)) {
                infowindow.setPosition(event.latLng);infowindow.open(map);
          }
     });
 }