Navigate between two points and dynamically recalculate an alternate route when the original route is unavailable.
Use case
While traveling between destinations, field workers use navigation to get live directions based on their locations. In cases where a field worker makes a wrong turn, or if the route suggested is blocked due to a road closure, it is necessary to calculate an alternate route to the original destination.
How to use the sample
Click 'Navigate' to simulate traveling and to receive directions from a preset starting point to a preset destination. Observe how the route is recalculated when the simulation does not follow the suggested route.
How it works
- Create a
RouteTaskusing a local geodatabase. - Generate default
RouteParametersusingcreateDefaultParameters. - Set
returnStopsandreturnDirectionson the parameters to true. - Add
Stops to the parametersstopscollection for each destination. - Solve the route using to get a
RouteResult. - Create a
RouteTrackerusing the route result, and the index of the desired route to take. - Enable rerouting in the route tracker. Use
ReroutingStrategy::toNextWaypointto specify that in the case of a reroute the new route goes from present location to next waypoint or stop. - Track the location of the device and update the route tracking status.
- Add a listener to capture and get the
TrackingStatusand use it to display updated route information. Tracking status includes a variety of information on the route progress, such as the remaining distance, remaining geometry or traversed geometry (represented by aPolyline), or the remaining time (Double), amongst others. - Add a
NewVoiceGuidanceListenerto get theVoiceGuidancewhenever new instructions are available. - You can also query the tracking status for the current
DirectionManeuverindex, retrieve that maneuver from theRouteand get its direction text to display in the GUI. - To establish whether the destination has been reached, get the
DestinationStatusfrom the tracking status. If the destination status isREACHED, and theremainingDestinationCountis 1, you have arrived at the destination and can stop routing. If there are several destinations in your route, and the remaining destination count is greater than 1, switch the route tracker to the next destination.
Relevant API
- DestinationStatus
- DirectionManeuver
- Location
- LocationDataSource
- ReroutingStrategy
- Route
- RouteParameters
- RouteTask
- RouteTracker
- Stop
- VoiceGuidance
Offline data
The data used by this sample is available on ArcGIS Online.
| Link | Local Location |
|---|---|
| Navigate a Route JSON Track | <userhome>/ArcGIS/Runtime/Data/tpkx/san_diego |
About the data
The route taken in this sample goes from the San Diego Convention Center, site of the annual Esri User Conference, to the Fleet Science Center, San Diego.
Additional information
The route tracker will start a rerouting calculation automatically as necessary when the device's location indicates that it is off-route. The route tracker also validates that the device is "on" the transportation network, if it is not (e.g. in a parking lot) rerouting will not occur until the device location indicates that it is back "on" the transportation network.
Tags
directions, maneuver, navigation, route, turn-by-turn, voice
Sample Code
// [WriteFile Name=NavigateRoute, Category=Routing]
// [Legal]
// Copyright 2022 Esri.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]
import QtQuick
import QtQuick.Controls
import Esri.ArcGISRuntime
import QtQuick.Layouts
import QtPositioning
import Esri.ArcGISExtras
import Esri.samples
Rectangle {
id: rootRectangle
clip: true
width: 800
height: 600
readonly property url dataPath: {
Qt.platform.os === "ios" ?
System.writableLocationUrl(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data/tpkx/" :
System.writableLocationUrl(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data/tpkx/"
}
property var directionListModel: null
property Route route: null
property bool navigatingInProgress: false
property string routeText: "Route status:"
MapView {
id: mapView
anchors.fill: parent
Component.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
setViewpointGeometryAndPadding(tourPath.extent, 100);
}
Map {
Basemap {
initStyle: Enums.BasemapStyleArcGISNavigation
}
}
GraphicsOverlay {
id: routeOverlay
Graphic {
id: routeAheadGraphic
SimpleLineSymbol {
style: Enums.SimpleLineSymbolStyleSolid
color: "blue"
width: 5
}
}
Graphic {
id: routeTraveledGraphic
SimpleLineSymbol {
style: Enums.SimpleLineSymbolStyleSolid
color: "cyan"
width: 3
}
}
Graphic {
geometry: stop1.geometry
symbol: stopSymbol
}
Graphic {
geometry: stop2.geometry
symbol: stopSymbol
}
SimpleMarkerSymbol {
id: stopSymbol
style: Enums.SimpleMarkerSymbolStyleDiamond
color: "red"
size: 20
}
}
locationDisplay.onLocationChanged: {
routeTracker.trackRuntimeLocation(locationDisplay.location);
}
}
SimulatedLocationDataSource {
id: simulatedLocationDataSource
}
SimulationParameters {
id: simulationParameters
velocity: 40
}
Polyline {
id: tourPath
json: {
"paths":[[[ -117.160386727066026, 32.706608204740171 ], [ -117.160205336548898, 32.706508733108137 ], [ -117.16002394693011, 32.706409261365152 ], [ -117.159842556412997, 32.706309788755419 ], [ -117.159651667110055, 32.706216667017223 ], [ -117.159454444684357, 32.706127778166461 ], [ -117.159257222258688, 32.706038889227095 ], [ -117.159059999833019, 32.705950000199223 ], [ -117.158902856642044, 32.705835713852132 ], [ -117.158739999267553, 32.705720000231665 ], [ -117.158576363053726, 32.705604545733003 ], [ -117.158417272315205, 32.70549090901352 ], [ -117.158256250198832, 32.705376874547866 ], [ -117.158087499876075, 32.70526125028416 ], [ -117.157918750451643, 32.70514562511471 ], [ -117.1577500001289, 32.705029999795485 ], [ -117.157600000341063, 32.704940000101111 ], [ -117.157425000438906, 32.704823332883613 ], [ -117.157250000536706, 32.704706666269544 ], [ -117.15707875020253, 32.70459250003033 ], [ -117.156909999879787, 32.704480000413547 ], [ -117.156741250455326, 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"spatialReference":{
"wkid":4326,
"latestWkid":4326
}
}
}
Stop {
id: stop1
}
Stop {
id: stop2
}
RouteTask {
id: routeTask
url: dataPath + "san_diego/sandiego.geodatabase"
networkName: "Streets_ND"
Component.onCompleted: {
load();
}
onLoadStatusChanged: {
if (loadStatus === Enums.LoadStatusLoaded) {
createDefaultParameters();
}
}
onCreateDefaultParametersStatusChanged: {
if (createDefaultParametersStatus !== Enums.TaskStatusCompleted)
return;
stop1.geometry = tourPath.parts.part(0).startPoint();
stop2.geometry = tourPath.parts.part(0).endPoint();
createDefaultParametersResult.returnStops = true;
createDefaultParametersResult.returnDirections = true;
createDefaultParametersResult.returnRoutes = true;
createDefaultParametersResult.outputSpatialReference = Factory.SpatialReference.createWgs84();
createDefaultParametersResult.setStops([stop1, stop2]);
reroutingParameters.routeParameters = createDefaultParametersResult;
navigateButton.enabled = true;
}
onSolveRouteStatusChanged: {
if (solveRouteStatus === Enums.TaskStatusCompleted) {
if (solveRouteResult.routes.length > 0) {
routeTracker.routeResult = solveRouteResult;
routeTracker.routeIndex = 0;
// Rerouting can only be enabled after the RouteTracker.routeResult property has been instantiated
routeTracker.enableReroutingWithReroutingParameters(reroutingParameters);
route = solveRouteResult.routes[0];
mapView.setViewpointGeometryAndPadding(route.routeGeometry, 100);
routeAheadGraphic.geometry = route.routeGeometry;
directionListModel = route.directionManeuvers;
// Turn on mapview's navigation mode
recenterMap();
}
}
}
}
ReroutingParameters {
id: reroutingParameters
routeTask: routeTask
strategy: Enums.ReroutingStrategyToNextWaypoint
visitFirstStopOnStart: false
}
RouteTracker {
id: routeTracker
onRerouteCompletedResultChanged: {
routeResult = rerouteCompletedResult.routeResult;
route = routeResult.routes[0];
directionListModel = route.directionManeuvers;
routeAheadGraphic.geometry = route.routeGeometry;
recenterMap();
}
onTrackingStatusResultChanged: {
// Display route information text
routeText = "Route status:"
if (routeTracker.trackingStatusResult.destinationStatus === Enums.DestinationStatusApproaching || routeTracker.trackingStatusResult.destinationStatus === Enums.DestinationStatusNotReached) {
// Ensure simulated location data source starts properly after previously reaching its end point
if (!navigatingInProgress)
navigatingInProgress = true;
// Display distance to destination remaining
routeText += "\nDistance remaining: " + trackingStatusResult.routeProgress.remainingDistance.displayText + " " +
trackingStatusResult.routeProgress.remainingDistance.displayTextUnits.pluralDisplayName;
// Display estimated time to destination
const time = new Date(trackingStatusResult.routeProgress.remainingTime * 60 * 1000);
const hours = time.getUTCHours();
const minutes = time.getUTCMinutes();
const seconds = time.getSeconds();
routeText += "\nTime remaining: " + hours.toString().padStart(2, '0') + ':' + minutes.toString().padStart(2, '0') + ':' +
seconds.toString().padStart(2, '0');
// Display next direction
if (trackingStatusResult.currentManeuverIndex + 1 < directionListModel.count) {
routeText += "\nNext direction: " + directionListModel.get(trackingStatusResult.currentManeuverIndex + 1).directionText;
}
routeTraveledGraphic.geometry = trackingStatusResult.routeProgress.traversedGeometry;
routeAheadGraphic.geometry = trackingStatusResult.routeProgress.remainingGeometry;
} else if (routeTracker.trackingStatusResult.destinationStatus === Enums.DestinationStatusReached) {
routeText += "\nDestination reached"
// Set the route geometries to reflect the completed route
routeTraveledGraphic.geometry = trackingStatusResult.routeProgress.traversedGeometry;
// Navigate to next stop, if available
if (trackingStatusResult.remainingDestinationCount > 1) {
switchToNextDestination();
} else {
// The simulated location data source will start at the most recent location
// this logic ensures that if the simulated location data source starts at the end point, it is not immediately stopped
if (navigatingInProgress) {
navigatingInProgress = false;
simulatedLocationDataSource.stop();
recenterButton.enabled = false;
navigateButton.enabled = true;
}
}
}
}
// Output new voice guidance
onNewVoiceGuidanceResultChanged: {
speaker.textToSpeech(newVoiceGuidanceResult.text);
}
// Set a callback to indicate if the speech engine is ready to speak
speechEngineReadyCallback: function() {
return speaker.textToSpeechEngineReady();
}
}
NavigateRouteSpeaker {
id: speaker
}
function startNavigation() {
// Solve the route with the default parameters
routeTask.solveRoute(routeTask.createDefaultParametersResult);
// Add a data source for the location display
simulatedLocationDataSource.setLocationsWithPolylineAndParameters(tourPath, simulationParameters);
mapView.locationDisplay.dataSource = simulatedLocationDataSource;
simulatedLocationDataSource.start();
recenterButton.enabled = true;
}
function recenterMap() {
mapView.locationDisplay.autoPanMode = Enums.LocationDisplayAutoPanModeNavigation;
}
Rectangle {
id: routeInformationBox
anchors {
top: parent.top
left: parent.left
margins: 20
}
width: buttonRow.width * 1.5
height: 200
color: "#FBFBFB"
border.color: "black"
// Prevent mouse interaction from propagating to the MapView
MouseArea {
anchors.fill: parent
onPressed: mouse => mouse.accepted = true;
onWheel: wheel => wheel.accepted = true;
}
Column {
id: routeStatusTextColumn
anchors {
top: parent.top
left: parent.left
right: parent.right
margins: 10
}
spacing: 10
RowLayout {
id: buttonRow
anchors.horizontalCenter: parent.horizontalCenter
Button {
id: navigateButton
text: "Navigate"
enabled: false
onClicked: {
startNavigation();
enabled = false;
}
}
Button {
id: recenterButton
text: "Recenter"
enabled: false;
onClicked: {
recenterMap();
}
}
}
Text {
id: routeStatusText
anchors {
left: parent.left
right: parent.right
}
text: routeText
font.pixelSize: 12
wrapMode: Text.WordWrap
}
}
}
}