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Circles

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

Read the documentation.

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: 37.09, lng: -95.712 },
    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
    });
  }
}

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Circles</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

All

<!DOCTYPE html>
<html>
  <head>
    <title>Circles</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script>
      (function(exports) {
        "use strict";

        // 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: 37.09,
              lng: -95.712
            },
            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
            });
          }
        }

        exports.citymap = citymap;
        exports.initMap = initMap;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
(function(exports) { "use strict"; // 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: 37.09, lng: -95.712 }, 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 }); } } exports.citymap = citymap; exports.initMap = initMap; })((this.window = this.window || {}));
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Circles</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>