Angel Espinoza Angel Espinoza - 8 days ago 4
Javascript Question

How can I detect of which figure(circle, polygon) comes some events when this is overlaid it? google maps api javascript

I have problems with geometry figures in google maps(circles and polygons), example: when i have two circles overlaid and I use the event mouse over or mouseout, google maps is only print the information of the circle more big , because the big figure is put after the small. i have the same problems if i have 7 circles or polygons almost in the same position.

This is a example with two circles, but the problem is in the combination of the figures.



<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Circles</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 80%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>

// This example creates circles on the map, representing populations in North
// America.

// First, create an object containing LatLng and population for each city.
var citymap = {
chicago: {
center: {lat: 41.878, lng: -87.629},
population: 845837
},
chicago1: {
center: {lat: 41.878, lng: -87.629},
population: 2714856
},
losangeles: {
center: {lat: 34.052, lng: -118.243},
population: 3857799
},
vancouver: {
center: {lat: 49.25, lng: -123.1},
population: 603502
}
};

function initMap() {
// Create the map.
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: 37.090, lng: -95.712},
mapTypeId: google.maps.MapTypeId.TERRAIN
});

// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
var cont=0;
for (var city in citymap) {
// Add the circle for this city to the map.
var cityCircle = new google.maps.Circle({
text:'hola'+cont,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
title:'hola'+cont,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
optimized: false,
zIndex:10,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].population) * 100
});
cont++;

google.maps.event.addListener(cityCircle, 'mouseover', function(event) {
var lat = this.getCenter().lat();
var lon = this.getCenter().lng();
var lat2 = event.latLng.lat();
var lon2 = event.latLng.lng();
console.log(lat+lon+"Circulo"+this.text);
console.log(lat2+lon2+"mouse");
console.log(this.zIndex+"index"+this.text);
});

google.maps.event.addListener(cityCircle,'mouseout',function(event){
var lat = this.getCenter().lat();
var lon = this.getCenter().lng();
var lat2 = event.latLng.lat();
var lon2 = event.latLng.lng();
console.log(lat+lon+"Circulo"+this.text);
console.log(lat2+lon2+"mouse");
console.log(this.zIndex+"index"+this.text);
});
}

}

</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBwm19SMHtEZaXzloVeyMeMULkciJuatEo&signed_in=true&callback=initMap"></script>
</script>
</body>
</html>




Answer

You can't use mouseover/mouseout for that. You need to process through all your objects and determine whether the mouseevent is inside the object or not (for a circle the distance from the center is less than the radius, for a polygon the containsLocation method).

Example map mousemove listener:

google.maps.event.addListener(map, 'mousemove', function(event) {
  var lat = event.latLng.lat();
  var lon = event.latLng.lng();
  for (var i = 0; i < areaArray.length; i++) {
    if (areaArray[i].getRadius) {
      // circle
      if (google.maps.geometry.spherical.computeDistanceBetween(areaArray[i].getCenter(), event.latLng) < areaArray[i].getRadius()) {
      console.log("in circle:"+event.latLng.toUrlValue(6) + "Circulo center="+areaArray[i].getCenter().toUrlValue(6)+" radius="+areaArray[i].getRadius()+" meters, " + areaArray[i].text);
      // console.log(lat2 + lon2 + "mouse");
      // console.log(this.zIndex + "index" + this.text);
      }
    }
  }
});

proof of concept fiddle (for the circles in your example)

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