It's the 15th anniversary of Google Maps Platform - Check out the latest news and announcements

Circles

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

Read the documentation.

TypeScript

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

// First, create an object containing LatLng and population for each city.

interface City {
  center: google.maps.LatLngLiteral;
  population: number;
}

const citymap: Record<string, City> = {
  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(): void {
  // Create the map.
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      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 (const city in citymap) {
    // Add the circle for this city to the map.
    const cityCircle = new google.maps.Circle({
      strokeColor: "#FF0000",
      strokeOpacity: 0.8,
      strokeWeight: 2,
      fillColor: "#FF0000",
      fillOpacity: 0.35,
      map,
      center: citymap[city].center,
      radius: Math.sqrt(citymap[city].population) * 100
    });
  }
}

JavaScript

const 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.
  const 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 (const city in citymap) {
    // Add the circle for this city to the map.
    const cityCircle = new google.maps.Circle({
      strokeColor: "#FF0000",
      strokeOpacity: 0.8,
      strokeWeight: 2,
      fillColor: "#FF0000",
      fillOpacity: 0.35,
      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>
      "use strict";

      const 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.
        const 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 (const city in citymap) {
          // Add the circle for this city to the map.
          const cityCircle = new google.maps.Circle({
            strokeColor: "#FF0000",
            strokeOpacity: 0.8,
            strokeWeight: 2,
            fillColor: "#FF0000",
            fillOpacity: 0.35,
            map,
            center: citymap[city].center,
            radius: Math.sqrt(citymap[city].population) * 100
          });
        }
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
"use strict"; const 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. const 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 (const city in citymap) { // Add the circle for this city to the map. const cityCircle = new google.maps.Circle({ strokeColor: "#FF0000", strokeOpacity: 0.8, strokeWeight: 2, fillColor: "#FF0000", fillOpacity: 0.35, map, center: citymap[city].center, radius: Math.sqrt(citymap[city].population) * 100 }); } }
/* 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=AIzaSyCb1xprYSpXd0q_yDsJ1W2UGhfl9_YGKU0&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>