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Circles

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JavaScript
// 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: 2714856
  },
  newyork: {
    center: {lat: 40.714, lng: -74.005},
    population: 8405837
  },
  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.
  for (var city in citymap) {
    // Add the circle for this city to the map.
    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
    });
  }
}
JavaScript + HTML
<!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: 100%;
      }
    </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: 2714856
  },
  newyork: {
    center: {lat: 40.714, lng: -74.005},
    population: 8405837
  },
  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.
  for (var city in citymap) {
    // Add the circle for this city to the map.
    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
    });
  }
}

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

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