HERE MAP API - Part3 Basic Routing

var platform = new H.service.Platform({
		app_id: '[YOUR APP ID HERE]',
		app_code: '[YOUR APP CODE HERE]'
});

var router = platform.getRoutingService();

// build a function to take the map and platform objects as parameters
function HERERoute (map, platform, routeOptions) {
// access the routing service by calling getRoutingService()
    var router = platform.getRoutingService();
// error handling    
    var onSuccess = function(result) {
      console.log('Route found!', result);
    };
    var onError = function(error) {
      console.error('Oh no! There was some communication error!', error);
    }
  
    router.calculateRoute(routeOptions, onSuccess, onError);
  }

var onSuccess = function (result) {
    
        // Option_1 Simply put the response to the console log
        console.log('Route found!', result);

        // Option_2 Furtherly draw the response to the map
        var route,
            routeShape,
            startPoint,
            endPoint,
            lineString;

        if (result.response.route) {
            
            // Just take the first Route in the array
            route = result.response.route[0];
            routeShape = route.shape;

            // H.geo.LineString is recommended, instead of H.geo.Strip in the offical demo code
            lineString = new H.geo.LineString();
            routeShape.forEach(function (point) {
                var parts = point.split(',');
                lineString.pushLatLngAlt(parts[0], parts[1]);
            });

            // Utilize H.map.Polyline to draw a blue line
            var routeLine = new H.map.Polyline(lineString, {
                style: {
                    strokeColor: 'blue',
                    lineWidth: 10
                }
            });
            map.addObject(routeLine);

            // update the map bounds to that of our route
            map.setViewBounds(routeLine.getBounds());
        }
    };

// a small helper which converts a location into a waypoint
function locationToWaypointString(coordinates) {
  return 'geo!' + coordinates.lat + ',' + coordinates.lng;
}

// set a flag called RouteRendered
// to ensure that the route is only rendered the first time
var routeRendered = false;

function updatePosition(event) {
  var coordinates = {
    lat: event.coords.latitude,
    lng: event.coords.longitude
  };

  var marker = new H.map.Marker(coordinates);
  map.addObject(marker);

  // If the route has not been rendered yet, 
  // calculate and render it
  if (!routeRendered) {
    var route = new HERERoute(map, platform, {
      mode: 'fastest;car',
      representation: 'display',
      waypoint0: locationToWaypointString(coordinates),
      waypoint1: locationToWaypointString(EndCoordinates)
    });
    routeRendered = true;
  }
}

// request the user's current location
navigator.geolocation.watchPosition(updatePosition);