I am developing a system to trace route using Google Maps API.

I have the points of origin and destination and between these points there are some points of interest. When plotting the Route Google returns me the best route and mark these points on the map. I display the route data in a div.

My function that calculates the route, the part that returns the data looks like this:

directionsService.route(request, $.proxy(function(response, status){

  if (status == google.maps.DirectionsStatus.OK) {

    directionsDisplay.setDirections(response);
    var orders = response.routes[0].waypoint_order; 
    var route = response.routes[0];
    var total_distance = 0;
    var displayRoute = $('#detail-route');

    for (i = 0; i < route.legs.length; i++){

      var routeSegment = i + 1,
      from_address = route.legs[i].start_address.split(','),
      to_address = route.legs[i].end_address.split(',');
      total_distance += Math.floor(route.legs[i].distance.value / 1000);

      displayRoute.append('<b>Trecho ' + routeSegment + ': </b><br/>');
      displayRoute.append('<b>Saindo de: </b>' + from_address[0] + '<br/>');
      displayRoute.append('<b>Indo para: </b>' + to_address[0] + '<br/>');
      displayRoute.append('<b>Distância: </b>' + route.legs[i].distance.text);
    }

    displayRoute.prepend('total:' + this.format(total_distance) + ' km' + '<br/><br/>');

function format() it's my function to format km.

O problem is that on some routes waypoint_order shows a different order.

For example:

For a given route, the route.legs[i] returns Order:

waypoint 0, 1 waypoint, waypoint 3, waypoint 2

But returns waypoint_orderattribute [3, 0, 2, 1, 3].

Question

Is this the expected behavior, or is something missing?