Complex Polylines

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JavaScript

// This example creates an interactive map which constructs a
// polyline based on user clicks. Note that the polyline only appears
// once its path property contains two LatLng coordinates.

var poly;
var map;

function initialize() {
  var mapOptions = {
    zoom: 7,
    // Center the map on Chicago, USA.
    center: new google.maps.LatLng(41.879535, -87.624333)
  };

  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var polyOptions = {
    strokeColor: '#000000',
    strokeOpacity: 1.0,
    strokeWeight: 3
  };
  poly = new google.maps.Polyline(polyOptions);
  poly.setMap(map);

  // Add a listener for the click event
  google.maps.event.addListener(map, 'click', addLatLng);
}

/**
 * Handles click events on a map, and adds a new point to the Polyline.
 * @param {google.maps.MouseEvent} event
 */
function addLatLng(event) {

  var path = poly.getPath();

  // Because path is an MVCArray, we can simply append a new coordinate
  // and it will automatically appear.
  path.push(event.latLng);

  // Add a new marker at the new plotted point on the polyline.
  var marker = new google.maps.Marker({
    position: event.latLng,
    title: '#' + path.getLength(),
    map: map
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

JavaScript + HTML

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Complex Polylines</title>
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
    <script>
// This example creates an interactive map which constructs a
// polyline based on user clicks. Note that the polyline only appears
// once its path property contains two LatLng coordinates.

var poly;
var map;

function initialize() {
  var mapOptions = {
    zoom: 7,
    // Center the map on Chicago, USA.
    center: new google.maps.LatLng(41.879535, -87.624333)
  };

  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var polyOptions = {
    strokeColor: '#000000',
    strokeOpacity: 1.0,
    strokeWeight: 3
  };
  poly = new google.maps.Polyline(polyOptions);
  poly.setMap(map);

  // Add a listener for the click event
  google.maps.event.addListener(map, 'click', addLatLng);
}

/**
 * Handles click events on a map, and adds a new point to the Polyline.
 * @param {google.maps.MouseEvent} event
 */
function addLatLng(event) {

  var path = poly.getPath();

  // Because path is an MVCArray, we can simply append a new coordinate
  // and it will automatically appear.
  path.push(event.latLng);

  // Add a new marker at the new plotted point on the polyline.
  var marker = new google.maps.Marker({
    position: event.latLng,
    title: '#' + path.getLength(),
    map: map
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>