circle-simple

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2026 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Circles</title>

    <script>
      // prettier-ignore
      (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
            });
    </script>
  </head>
  <body>
    <gmp-map
      center="34.98956821576194, 135.74239981260283"
      zoom="15"
      map-id="DEMO_MAP_ID">
      <div id="control-panel" slot="control-inline-start-block-start">
        <input id="short-walk" type="radio" name="radius" value="400" checked />
        <label for="short-walk">Short Walk (~5 minutes)</label><br />
        <input id="medium-walk" type="radio" name="radius" value="800" />
        <label for="medium-walk">Medium Walk (~15 minutes)</label><br />
        <input id="long-walk" type="radio" name="radius" value="1600" />
        <label for="long-walk">Long Walk (~30 minutes) </label>
      </div>
    </gmp-map>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

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

#control-panel {
  display: none; /* Set to 'display: block' after the map loads. */
  background-color: #fff;
  border: 2px solid #fff;
  border-radius: 3px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  font-family: 'Roboto', sans-serif;
  font-size: medium;
  margin: 10px;
  padding: 10px;
}

JavaScript

'use strict';
/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

const mapElement = document.querySelector('gmp-map');
let innerMap;

async function init() {
  // Request needed libraries.
  const [{ Circle }, { AdvancedMarkerElement }, { event }] = await Promise.all([
    google.maps.importLibrary('maps'),
    google.maps.importLibrary('marker'),
    google.maps.importLibrary('core'),
  ]);

  // Set the initial map center point.
  const initialCenter = { lat: 34.98956821576194, lng: 135.74239981260283 }; // Hotel Emion, Kyoto, Japan

  // Get the inner map.
  innerMap = mapElement.innerMap;

  // Get the buttons.
  const buttons = document.querySelectorAll('input[name="radius"]');

  // Create the circle.
  const walkingCircle = new Circle({
    strokeColor: '#ffdd00ff',
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: '#ffdd00ff',
    fillOpacity: 0.35,
    map: innerMap,
    center: initialCenter,
    radius: 400,
    draggable: true,
    editable: false,
  });

  // Define a "Crosshair" vector icon
  const parser = new DOMParser();
  const svgString = `<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="-6 -6 12 12"><path d="M -6,0 L 6,0 M 0,-6 L 0,6" stroke="black" stroke-width="1"/></svg>`;

  const pinSvg = parser.parseFromString(
    svgString,
    'image/svg+xml'
  ).documentElement;

  const centerMarker = new AdvancedMarkerElement({
    position: initialCenter,
    title: 'A marker using a custom SVG image.',
    anchorLeft: '-50%',
    anchorTop: '-50%',
  });
  centerMarker.append(pinSvg);
  mapElement.append(centerMarker);

  // Wait for the map to finish drawing its tiles.
  event.addListenerOnce(innerMap, 'tilesloaded', () => {
    // Get the controls div
    const controls = document.getElementById('control-panel');

    // Display controls once map is loaded.
    if (controls) {
      controls.style.display = 'block';
    }
  });

  // Add event listener...