Click two or more points on the map to draw polylines.
Read the documentation.
// 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 initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 7,
center: {lat: 41.879, lng: -87.624} // Center the map on Chicago, USA.
});
poly = new google.maps.Polyline({
strokeColor: '#000000',
strokeOpacity: 1.0,
strokeWeight: 3
});
poly.setMap(map);
// Add a listener for the click event
map.addListener('click', addLatLng);
}
// Handles click events on a map, and adds a new point to the Polyline.
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
});
}
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 425px;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
<!-- Replace the value of the key parameter with your own API key. --> <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"> </script>
Try it yourself
You can experiment with this code in JSFiddle by clicking the <> icon in the
top-right corner of the code window.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Complex Polylines</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 425px;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<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 initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 7,
center: {lat: 41.879, lng: -87.624} // Center the map on Chicago, USA.
});
poly = new google.maps.Polyline({
strokeColor: '#000000',
strokeOpacity: 1.0,
strokeWeight: 3
});
poly.setMap(map);
// Add a listener for the click event
map.addListener('click', addLatLng);
}
// Handles click events on a map, and adds a new point to the Polyline.
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
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
</html>
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