Find a route and directions

Before starting this tutorial:

1. You need an ArcGIS Location Platform or ArcGIS Online account.

2. Your system meets the system requirements.

3. The ArcGIS Maps SDK for Qt, version 200.7.0 or later is installed.

4. The Qt 6.8.2 software development framework is installed.

Option 1: Develop the code

To start the tutorial, complete the Display a map tutorial. This creates a map to display the Santa Monica Mountains in California using the topographic basemap from the ArcGIS basemap styles service.

Open a Qt Creator project

1. Open the project you created by completing the Display a map tutorial.
2. Continue with the following instructions to find a route and directions with the ArcGIS routing service.

Set developer credentials

To allow your app users to access ArcGIS location services, use the developer credentials that you created in the Set up authentication step to authenticate requests for resources.

Declare classes, functions, variables, enumerations and signals

1. In the Display_a_map project, double click on Headers > Display_a_map.h to open the file. Add the four class declarations shown.

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   namespace Esri::ArcGISRuntime {
   
   class Map;
   class MapQuickView;
   
   class Graphic;
   class GraphicsOverlay;
   class PictureMarkerSymbol;
   class RouteTask;
   

2. Create an enum to monitor user route selections and maintain the route builder status. This will be initialized in Display_a_map.cpp in a later step.

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   class Graphic;
   class GraphicsOverlay;
   class PictureMarkerSymbol;
   class RouteTask;
   
   }  // namespace Esri::ArcGISRuntime
   
   enum RouteBuilderStatus
   {
     NotStarted,
     SelectedStart,
     SelectedStartAndEnd,
   };
   

3. Add an #include statement, class declaration, and a Meta Object Compiler (MOC) to add an include that exposes the QAbstractListModel.

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   enum RouteBuilderStatus
   {
     NotStarted,
     SelectedStart,
     SelectedStartAndEnd,
   };
   
   #include <QObject>
   
   #include "RouteParameters.h"
   class QAbstractListModel;
   Q_MOC_INCLUDE("QAbstractListModel")
   
   Q_MOC_INCLUDE("MapQuickView.h")
   

4. Use Q_PROPERTY to create a member variable m_directions.

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   class Display_a_map : public QObject
   {
       Q_OBJECT
       Q_PROPERTY(Esri::ArcGISRuntime::MapQuickView* mapView READ mapView WRITE setMapView NOTIFY mapViewChanged)
   
       Q_PROPERTY(QAbstractListModel* directions MEMBER m_directions NOTIFY directionsChanged)
   

5. Add the following signal declaration; this will be used to prompt updates to route directions.

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   public:
       explicit Display_a_map(QObject* parent = nullptr);
       ~Display_a_map() override;
   
   signals:
       void mapViewChanged();
   
        void directionsChanged();
   

6. Declare the following private methods.

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   private:
       Esri::ArcGISRuntime::MapQuickView* mapView() const;
       void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);
       void setupViewpoint();
   
       void setupRouteTask();
       void findRoute();
       void resetState();
   

7. Declare and initialize the following pointers, object, and enumeration. Then save and close the file.

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       void setupRouteTask();
       void findRoute();
       void resetState();
   
       Esri::ArcGISRuntime::Map* m_map = nullptr;
       Esri::ArcGISRuntime::MapQuickView* m_mapView = nullptr;
   
       Esri::ArcGISRuntime::GraphicsOverlay* m_graphicsOverlay = nullptr;
       Esri::ArcGISRuntime::RouteTask* m_routeTask = nullptr;
       Esri::ArcGISRuntime::Graphic* m_startGraphic = nullptr;
       Esri::ArcGISRuntime::Graphic* m_endGraphic = nullptr;
       Esri::ArcGISRuntime::Graphic* m_lineGraphic = nullptr;
       QAbstractListModel* m_directions = nullptr;
       Esri::ArcGISRuntime::RouteParameters m_routeParameters;
       RouteBuilderStatus m_currentState;
   

   Expand

Include header files to access needed classes

1. In the display_a_map project, double click on Sources > Display_a_map.cpp to open the file. Add #include statements for the classes shown.

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   #include "Display_a_map.h"
   #include "Map.h"
   #include "MapTypes.h"
   #include "MapQuickView.h"
   #include "Point.h"
   #include "Viewpoint.h"
   #include "SpatialReference.h"
   #include <QFuture>
   
   
   #include "DirectionManeuverListModel.h"
   #include "Graphic.h"
   #include "GraphicListModel.h"
   #include "GraphicsOverlay.h"
   #include "GraphicsOverlayListModel.h"
   #include "Polyline.h"
   #include "RouteTask.h"
   #include "RouteResult.h"
   #include "RouteParameters.h"
   #include "Route.h"
   #include "SimpleLineSymbol.h"
   #include "SimpleMarkerSymbol.h"
   #include "Stop.h"
   #include "Symbol.h"
   #include "SymbolTypes.h"
   #include <QGeoPositionInfoSource>
   #include <QList>
   #include <QUrl>
   #include <QUuid>
   

Update the constructor

1. Update the constructor as shown. Set BasemapStyle to ArcGISStreets and initialize the RouteBuilderStatus enumeration.

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   Display_a_map::Display_a_map(QObject* parent /* = nullptr */):
       QObject(parent),
   
       m_map(new Map(BasemapStyle::ArcGISStreets, this)),
   
       m_currentState(RouteBuilderStatus::NotStarted)
   

2. Call the setupRouteTask() method within the constructor. This will be populated in a later step.

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   Display_a_map::Display_a_map(QObject* parent /* = nullptr */):
       QObject(parent),
   
       m_map(new Map(BasemapStyle::ArcGISStreets, this)),
   
       m_currentState(RouteBuilderStatus::NotStarted)
   
   {
   
       setupRouteTask();
   

Change the map's view point

1. In setupViewpoint() change the map's Point and Viewpoint to place the map over over downtown Los Angeles.

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   MapQuickView* Display_a_map::mapView() const
   {
       return m_mapView;
   }
   
   
   void Display_a_map::setupViewpoint()
   {
   
       const Point center(-118.24532, 34.05398, SpatialReference::wgs84());
       const Viewpoint viewpoint(center, 144447.638572);
   

Change setupViewpoint() to respond to mouse clicks and find the route

1. Add a connect statement to setupViewpoint() to detect user mouse clicks, set and display point graphics, respond to the first and second click (using the switch statement), and call findRoute on the second mouse click.

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   void Display_a_map::setupViewpoint()
   {
   
       const Point center(-118.24532, 34.05398, SpatialReference::wgs84());
       const Viewpoint viewpoint(center, 144447.638572);
   
       m_mapView->setViewpointAsync(viewpoint);
   
       connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& mouse)
       {
           const Point mapPoint = m_mapView->screenToLocation(mouse.position().x(), mouse.position().y());
           switch (m_currentState)
           {
           case RouteBuilderStatus::NotStarted:
               resetState();
               m_currentState = RouteBuilderStatus::SelectedStart;
               m_startGraphic->setGeometry(mapPoint);
               break;
           case RouteBuilderStatus::SelectedStart:
               m_currentState = RouteBuilderStatus::SelectedStartAndEnd;
               m_endGraphic->setGeometry(mapPoint);
               findRoute();
               break;
   
           case RouteBuilderStatus::SelectedStartAndEnd:
               // Ignore touches while routing is in progress
               break;
           }
       });
   

Create route graphics

1. Add code to setupViewpoint() to create the route's starting point Graphic, determined by the user's first mouse click. This consists of a SimpleLineSymbol, color blue, size 2, that outlines a SimpleMarkerSymbol, diamond shaped and orange in color. Create the route's ending point Graphic, determined by the user's second mouse click. This consists of a SimpleLineSymbol, color red, size 2, that outlines a SimpleMarkerSymbol, square shaped and green in color. Create a line Graphic connecting the route's starting and ending points using a SimpleLineSymbol, color blue, size 4. Then append the starting point graphic, ending point graphic, and route line graphic to a GraphicsOverlay.

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           case RouteBuilderStatus::SelectedStartAndEnd:
               // Ignore touches while routing is in progress
               break;
           }
       });
   
       m_graphicsOverlay = new GraphicsOverlay(this);
       m_mapView->graphicsOverlays()->append(m_graphicsOverlay);
   
       SimpleLineSymbol* startOutlineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 2/*width*/, this);
       SimpleMarkerSymbol* startSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Diamond, QColor("orange"), 12/*width*/, this);
       startSymbol->setOutline(startOutlineSymbol);
       m_startGraphic = new Graphic(this);
       m_startGraphic->setSymbol(startSymbol);
   
       SimpleLineSymbol* endOutlineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("red"), 2/*width*/, this);
       SimpleMarkerSymbol* endSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Square, QColor("green"), 12/*width*/, this);
       endSymbol->setOutline(endOutlineSymbol);
       m_endGraphic = new Graphic(this);
       m_endGraphic->setSymbol(endSymbol);
   
       SimpleLineSymbol* lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 4/*width*/, this);
       m_lineGraphic = new Graphic(this);
       m_lineGraphic->setSymbol(lineSymbol);
   
       m_graphicsOverlay->graphics()->append(QList<Graphic*> {m_startGraphic, m_endGraphic, m_lineGraphic});
   
   }
   

Create the setRouteTask() method

A task makes a request to a service and returns the results. Use the RouteTask class to access a routing service. Create a RouteTask with a string URL to reference the routing service.

1. Begin implementing the setRouteTask() method. Point the RouteTask to an online service. Call the create default parameters async method obtain the route parameters.

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   void Display_a_map::setupRouteTask()
   {
       // create the route task pointing to an online service
       m_routeTask = new RouteTask(QUrl("https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"), this);
   
       // Create the default parameters which will load the route task implicitly.
       m_routeTask->createDefaultParametersAsync().then(this,[this](const RouteParameters& routeParameters)
       {
           // Store the resulting route parameters.
           m_routeParameters = routeParameters;
       });
   }
   

Create the findRoute() method

1. Begin implementing the findRoute() method. Add code to first confirm that RouteTask has loaded and RouteParameters is not empty. Then set RouteParameters to return directions, and clear stops from previous routes. Then create Stop objects for the route from the geometries of the start and end graphics, and pass those to RouteParameters. Call solveRouteAsync(), passing in RouteParameters. With the route completed, set the route graphic's geometry and reset RouteBuilderStatus to prepare for a new route task. Then display the route directions.

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   void Display_a_map::findRoute()
   {
       if (m_routeTask->loadStatus() != LoadStatus::Loaded || m_routeParameters.isEmpty())
           return;
   
       // Set parameters to return directions.
       m_routeParameters.setReturnDirections(true);
   
       // Clear previous stops from the parameters.
       m_routeParameters.clearStops();
   
       // Set the stops to the parameters.
       const Stop stop1(Point(m_startGraphic->geometry()));
       const Stop stop2(Point(m_endGraphic->geometry()));
       m_routeParameters.setStops(QList<Stop> { stop1, stop2 });
   
       // Solve the route with the parameters.
       m_routeTask->solveRouteAsync(m_routeParameters).then(this,[this](const RouteResult& routeResult)
       {
           // Add the route graphic once the solve completes.
           const Route generatedRoute = routeResult.routes().at(0);
           m_lineGraphic->setGeometry(generatedRoute.routeGeometry());
           m_currentState = RouteBuilderStatus::NotStarted;
   
           // Set the direction maneuver list model.
           m_directions = generatedRoute.directionManeuvers(this);
           emit directionsChanged();
       });
   }
   

Create the resetState() method

This method resets all graphics and directions, and the RouteBuilderStatus enumeration. This happens at the beginning of every new route task.

1. Reset all graphics with empty Point objects, set m_directions to nullptr, and reset RouteBuilderStatus. Then save the file.

   Display_a_map.cpp

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   void Display_a_map::resetState()
   {
       m_startGraphic->setGeometry(Point());
       m_endGraphic->setGeometry(Point());
       m_lineGraphic->setGeometry(Point());
       m_directions = nullptr;
       m_currentState = RouteBuilderStatus::NotStarted;
   }
   

   Expand

Create the GUI

1. In the display_a_map project, double click on Resources > qml\qml.qrc > /qml > Display_a_mapForm.qml to open the file. Add the following import.

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   import QtQuick
   import QtQuick.Controls
   import Esri.Display_a_map
   
   import QtQuick.Shapes
   

2. Add the code highlighted below. This builds out the application GUI and displays the route and route directions.

   display_a_mapForm.qml

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       // Declare the C++ instance which creates the map etc. and supply the view.
       Display_a_map {
           id: model
           mapView: view
       }
   
       // Create window for displaying the route directions.
       Rectangle {
           id: directionWindow
           anchors {
               right: parent.right
               top: parent.top
               margins: 5
           }
   
           radius: 5
           visible: model.directions
           width: Qt.platform.os === "ios" || Qt.platform.os === "android" ? 250 : 350
           height: parent.height / 2
           color: "#FBFBFB"
           clip: true
   
           ListView {
               id: directionsView
               anchors {
                   fill: parent
                   margins: 5
               }
               header: Component {
                   Text {
                       height: 40
                       text: "Directions:"
                       font.pixelSize: 22
                   }
               }
   
               // Set the model to the DirectionManeuverListModel returned from the route.
               model: model.directions
               delegate: directionDelegate
           }
       }
   
       Component {
           id: directionDelegate
           Rectangle {
               id: rect
               width: parent.width
               height: textDirections.height
               color: directionWindow.color
   
               // separator for directions
               Shape {
                   height: 2
                   ShapePath {
                       strokeWidth: 1
                       strokeColor: "darkgrey"
                       strokeStyle: ShapePath.SolidLine
                       startX: 20; startY: 0
                       PathLine { x: parent.width - 20 ; y: 0 }
                   }
               }
   
               Text {
                   id: textDirections
                   text: qsTr("%1 (%2 miles)".arg(directionText).arg((length * 0.00062137).toFixed(2)))
                   wrapMode: Text.WordWrap
                   anchors {
                       leftMargin: 5
                       left: parent.left
                       right: parent.right
                   }
               }
           }
       }
   

   Expand

3. Press Ctrl + R to run the app.

The map should support two clicks to create an origin and destination point and then use the route service to display the resulting route and turn-by-turn directions.

Option 2: Download the solution

1. Click the Download solution link under Solution and unzip the file to a location on your machine.

2. Open the project in Qt Creator.

Since the downloaded solution does not contain authentication credentials, you must add the developer credentials that you created in the Set up authentication section.

Set developer credentials in the solution

To allow your app users to access ArcGIS location services, use the developer credentials that you created in the Set up authentication step to authenticate requests for resources.

Run the app

Press Ctrl + R to run the app.

The map should support two clicks to create an origin and destination point and then use the route service to display the resulting route and turn-by-turn directions.