Learn how to find a route and directions with the route service .
Routing is the process of finding the path from an origin to a destination in a street network. You can use the Routing service to find routes , get driving directions, calculate drive times, and solve complicated, multiple vehicle routing problems. To create a route, you typically define a set of stops (origin and one or more destinations) and use the service to find a route with directions. You can also use a number of additional parameters such as barriers and mode of travel to refine the results.
In this tutorial, you define an origin and destination by clicking on the map. These values are used to get a route and directions from the route service. The directions are also displayed on the map.
Prerequisites The following are required for this tutorial:
An ArcGIS account to access API keys . If you don't have an account, sign up for free . Your system meets the system requirements . The ArcGIS Maps SDK for Qt , version 200.0.0 or later is installed. ArcGIS Maps SDK for Qt version 200.0.0 and later requires Qt 6. The Qt 6 software development framework is installed. Steps Open the project in Qt Creator To start this tutorial, complete the Display a map tutorial or download
and unzip the solution.
Open the display_a_map project in Qt Creator.
If you downloaded the Display a map solution, set your API key.
More info An API Key enables access to services , web maps , and web scenes hosted in ArcGIS Online .
Go to your developer dashboard to get your API key .
For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.
In the Projects window, in the Sources folder, open the main.cpp file.
Modify the code to set the API key. Paste the API key, acquired from your dashboard, between the quotes. Then save and close the file.
main.cpp
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// 2. API key: A permanent key that gives your application access to Esri
// location services. Create a new API key or access existing API keys from
// your ArcGIS for Developers dashboard (https://links.esri.com/arcgis-api-keys).
const QString apiKey = QString ( "" );
Declare classes, functions, variables, enumerations and signals 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 ;
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 ;
}
enum RouteBuilderStatus
{
NotStarted,
SelectedStart,
SelectedStartAndEnd,
};
Add these #include
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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" )
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)
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public :
explicit Display_a_map(QObject* parent = nullptr );
~ Display_a_map () override ;
signals:
void mapViewChanged () ;
void directionsChanged () ;
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 () ;
Declare and initialize the following pointers, object, and enumeration. Then save and close the file.
Display_a_map.h
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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;
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 "TaskWatcher.h"
# 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 "SymbolStyle.h"
# include "SymbolTypes.h"
# include <QGeoPositionInfoSource>
# include <QList>
# include <QUrl>
# include <QUuid>
Update the constructor Update the constructor as shown. Set BasemapStyle
to ArcGISStreets
and initialize the Route Builder Status
enumeration.
Display_a_map.cpp
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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)
Call the setup Route Task()
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 In setup Viewpoint()
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 Add a connect
statement to setup Viewpoint()
to detect user mouse clicks, set and display point graphics, respond to the first and second click (using the switch
statement), and call find Route
on the second mouse click.
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const Point center ( -118.24532 , 34.05398 , SpatialReference::wgs84()) ;
const Viewpoint viewpoint (center, 144447.638572 ) ;
m_mapView-> setViewpoint (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 Add code to setup Viewpoint()
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 Simple Marker Symbol
, 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 Simple Markersymbol
, 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 Route Task
class to access a routing service .
Create a Route Task
with a string URL to reference the routing service .
Begin implementing the set Route Task()
method. Point the Route Task
to an online service. Then connect
to create Default Parameters Completed
and store the resulting 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 );
// Connect to createDefaultParametersCompleted signal.
connect (m_routeTask, &RouteTask::createDefaultParametersCompleted, this , [ this ]( const QUuid&, const RouteParameters& routeParameters)
{
// Store the resulting route parameters.
m_routeParameters = routeParameters;
});
Connect to solve Route Completed
. With the route completed, set the route graphic's Geometry
and reset Route Builder Status
to prepare for a new route task. Then display the route directions. Outside of connect
, configure the Route Task
with default parameters.
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// Connect to createDefaultParametersCompleted signal.
connect (m_routeTask, &RouteTask::createDefaultParametersCompleted, this , [ this ]( const QUuid&, const RouteParameters& routeParameters)
{
// Store the resulting route parameters.
m_routeParameters = routeParameters;
});
// Connect to solveRouteCompleted signal.
connect (m_routeTask, &RouteTask::solveRouteCompleted, this , [ this ]( const QUuid&, 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 default parameters which will load the route task implicitly.
m_routeTask-> createDefaultParameters ();
}
Create 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
. Finally, call solve Route()
, passing in RouteParameters
.
Display_a_map.cpp
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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-> solveRoute (m_routeParameters);
}
Create the resetState() method This method resets all graphics and directions, and the Route Builder Status
enumeration. This happens at the beginning of every new route task.
Reset all graphics with empty Point
objects, set m_ directions
to nullptr
, and reset Route Builder Status
. Then save the file.
Display_a_map.cpp
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Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line.
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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;
}
Create the GUI 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.
display_a_mapForm.qml
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import QtQuick
import QtQuick.Controls
import Esri.Display_a_map
import QtQuick.Shapes
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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