Don’t use overview_path for the polyline, it doesn’t include all the points, grab the points out of all the legs and use them to create the polyline.
var polyline = new google.maps.Polyline({
path: [],
strokeColor: '#FF0000',
strokeWeight: 3
});
var bounds = new google.maps.LatLngBounds();
var legs = response.routes[0].legs;
for (i=0;i<legs.length;i++) {
var steps = legs[i].steps;
for (j=0;j<steps.length;j++) {
var nextSegment = steps[j].path;
for (k=0;k<nextSegment.length;k++) {
polyline.getPath().push(nextSegment[k]);
bounds.extend(nextSegment[k]);
}
}
}
polyline.setMap(map);
map.fitBounds(bounds);
example
code snippet:
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(51.276092, 1.028938),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var directionsService = new google.maps.DirectionsService();
var directionsDisplay = new google.maps.DirectionsRenderer({
map: map,
preserveViewport: true
});
directionsService.route({
origin: new google.maps.LatLng(51.269776, 1.061326),
destination: new google.maps.LatLng(51.30118, 0.926486),
waypoints: [{
stopover: false,
location: new google.maps.LatLng(51.263439, 1.03489)
}],
travelMode: google.maps.TravelMode.DRIVING
}, function(response, status) {
if (status === google.maps.DirectionsStatus.OK) {
// directionsDisplay.setDirections(response);
var polyline = new google.maps.Polyline({
path: [],
strokeColor: '#0000FF',
strokeWeight: 3
});
var bounds = new google.maps.LatLngBounds();
var legs = response.routes[0].legs;
for (i = 0; i < legs.length; i++) {
var steps = legs[i].steps;
for (j = 0; j < steps.length; j++) {
var nextSegment = steps[j].path;
for (k = 0; k < nextSegment.length; k++) {
polyline.getPath().push(nextSegment[k]);
bounds.extend(nextSegment[k]);
}
}
}
polyline.setMap(map);
} else {
window.alert('Directions request failed due to ' + status);
}
});
}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map_canvas {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map_canvas"></div>