Google Maps for AngularJS Directions Service Draggable(v2.4.1)

AngularJS : 1.6.5
Google Maps for AngularJS : 2.4.1
include file

Route{{route.title}}
From：{{route.start}}
To：{{route.end}}
Distance：{{route.distance}}

Total Distance：{{map.total}}

<div ng-controller="MyCtrl">
  <div class="row">
    <div class="col-sm-6">
      <ui-gmap-google-map 
        id="map-canvas"
        center="map.center"
        zoom="map.zoom"
        draggable="true"
        options="map.options"
        control="map.control"
      >
      </ui-gmap-google-map>
    </div>
    <div class="col-sm-6">
      <form class="form-horizontal" role="form">
        <div class="form-group">
          <label class="col-sm-4 control-label">Start</label>
          <div class="col-sm-8">
            <select class="form-control" ng-model="routePoints.start" 
                    ng-options="route.name for route in map.routes.start">
            </select>
          </div>
        </div>
<i>(Ctrl-Click for multiple selection)</i> <br>
        <div class="form-group">
          <label class="col-sm-4 control-label">WayPoints</label>
          <div class="col-sm-8">
            <select multiple class="form-control" ng-model="routePoints.ways" 
                    ng-options="route.name for route in map.routes.ways">
            </select>
          </div>
        </div>
        <div class="form-group">
          <label class="col-sm-4 control-label">End</label>
          <div class="col-sm-8">
            <select class="form-control" ng-model="routePoints.end" 
                    ng-options="route.name for route in map.routes.end">
            </select>
          </div>
        </div>
        <button ng-click="calcRoute(routePoints)" type="submit" class="btn btn-default">Submit</button>
      </form>
      <li ng-repeat="route in routesDisplay">
      Route{{route.title}}<br />From：{{route.start}}<br />To：{{route.end}}<br />Distance：{{route.distance}}<br /><br />
      </li>
      <li>Total Distance：{{map.total}}</li>
    </div>
  </div>
</div>

var mapApp = angular.module('googleMapApp', ['uiGmapgoogle-maps']);

mapApp.config(
    ['uiGmapGoogleMapApiProvider', function(GoogleMapApiProviders) {
        GoogleMapApiProviders.configure({
          key: 'your Google Map api key',
          v: '3', //defaults to latest 3.X anyhow
          libraries: 'weather,geometry,visualization'
        });
    }]
);

mapApp.controller("MyCtrl",['$scope', 'uiGmapGoogleMapApi', function ($scope,uiGmapGoogleMapApi) {
  angular.extend($scope, {
    map: {
      center: {
        latitude: 35.6813,
        longitude: 139.7660
      },
      options: {
        maxZoom: 20,
        minZoom: 3
      },
      zoom: 15,
      control: {},
      total: {},
      routes: {
        start: [
          {name:'Tokyo Station', latlng:'35.6813,139.7660'},
          {name:'Ootemathi Station', latlng:'35.6842,139.7629'}
        ],
        ways: [
          {name:'Ootemon', latlng:'35.6856,139.7612'},
          {name:'Nijyubashi', latlng:'35.6794,139.7577'},
          {name:'Tokyo Tower', latlng:'日本, 東京都港区芝公園４-２-８'},
          {name:'Hama-rikyu Gardens', latlng:'日本, 東京都中央区浜離宮庭園１-1'}
        ],
        end: [
          {name:'Tokyo Station', latlng:'35.6813,139.7660'},
          {name:'Ootemathi Station', latlng:'35.6842,139.7629'}
        ]
      }
    },
    routePoints: {
      start: {},
      end: {}
    },
    routesDisplay: []
  });
  $scope.routePoints.start = $scope.map.routes.start[0];
  $scope.routePoints.end = $scope.map.routes.end[1];

  var rendererOptions = {
    draggable: true
  };

  uiGmapGoogleMapApi.then(function(maps) {
    var directionsDisplay = new maps.DirectionsRenderer(rendererOptions);

    function computeTotalDistance(result) {
      var total = 0;
      var myroutesDisplay = [];
      var myroute = result.routes[0];
      for (var i = 0; i < myroute.legs.length; i++) {
        var myrouteid = i + 1;
        total += myroute.legs[i].distance.value;
        myroutesDisplay.push({
          title: myrouteid,
          start: myroute.legs[i].start_address,
          end: myroute.legs[i].end_address,
          distance: myroute.legs[i].distance.text
        });
      }
      total = total / 1000.0;
      $scope.map.total = total + ' km';
      $scope.routesDisplay = myroutesDisplay;
      $scope.$apply();
    }

    $scope.calcRoute = function (routePoints) {
      var ways = [];
      for (var i = 0; i < routePoints.ways.length; i++) {
        ways.push({
          location:routePoints.ways[i].latlng,
          stopover:true
        });
      };
      var directionsService = new maps.DirectionsService();
      directionsDisplay.setMap($scope.map.control.getGMap());
      maps.event.addListener(directionsDisplay, 'directions_changed', function() {
        computeTotalDistance(directionsDisplay.getDirections());
      });
      var start = routePoints.start.latlng;
      var end = routePoints.end.latlng;
      var request = {
        origin: start,
        destination: end,
        waypoints: ways,
        optimizeWaypoints: true,
        travelMode: maps.TravelMode.WALKING
      };
      var routesDisplay = [];
      directionsService.route(request, function(response, status) {
        if (status == maps.DirectionsStatus.OK) {
          directionsDisplay.setDirections(response);
          var route = response.routes[0];
          for (var i = 0; i < route.legs.length; i++) {
            var routeid = i + 1;
            routesDisplay.push({
              title: routeid,
              start: route.legs[i].start_address,
              end: route.legs[i].end_address,
              distance: route.legs[i].distance.text
            });
          }
        }
      });
      $scope.routesDisplay = routesDisplay;
      return;
    };
  });
}]);

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