QGeoRoutingManager ¶

概要 ¶

详细描述 ¶

calculateRoute() and updateRoute() methods function QGeoRouteReply objects, which manage these operations and report on the result of the operations and any errors which may have occurred.

calculateRoute() function is used to find a route (or routes) that follows a set of waypoints and matches various other criteria. The QGeoRouteRequest class is used to specify this information.

If supportsRouteUpdates() returns true then the QGeoRoutingManager supports updating route information based on position updates. This will cause the travel time and distance estimates to be updated, and any QGeoRouteSegments already traversed to be removed from the route.

The updates can be triggered with the updateRoute() function, which makes use of the QGeoPositionInfo instances emitted as position updates by QGeoPositionInfoSource .

Instances of QGeoRoutingManager can be accessed with routingManager() .

A small example of the usage of QGeoRoutingManager and QGeoRouteRequests follows:

class MyRouteHandler : public QObject
{
    Q_OBJECT
public:
    MyRouteHandler(QGeoRoutingManager *routingManager,
                   const QGeoCoordinate &origin,
                   const QGeoCoordinate &destination) {
        QGeoRouteRequest request(origin, destination);
        // The request defaults to the fastest route by car, which is
        // equivalent to:
        // request.setTravelMode(QGeoRouteRequest::CarTravel);
        // request.setRouteOptimization(QGeoRouteRequest::FastestRoute);
        request.setAvoidFeatureTypes(QGeoRouteRequest::AvoidTolls);
        request.setAvoidFeatureTypes(QGeoRouteRequest::AvoidMotorPoolLanes);
        QGeoRouteRequest::AvoidFeaturesTypes avoidableFeatures = routingManager->supportedAvoidFeatureTypes();
        if (!(avoidableFeatures & request.avoidFeatureTypes())) {
            // ... inform the user that the routing manager does not
            // provide support for avoiding tolls and/or motor pool lanes ...
            return;
        }
        QGeoRouteReply *reply = routingManager->calculateRoute(request);
        if (reply->isFinished()) {
            if (reply->error() == QGeoRouteReply::NoError) {
                routeCalculated(reply);
            } else {
                routeError(reply, reply->error(), reply->errorString());
            }
            return;
        }
        connect(routingManager,
                SIGNAL(finished(QGeoRouteReply*)),
                this,
                SLOT(routeCalculated(QGeoRouteReply*)));
        connect(routingManager,
                SIGNAL(error(QGeoRouteReply*,QGeoRouteReply::Error,QString)),
                this,
                SLOT(routeError(QGeoRouteReply*,QGeoRouteReply::Error,QString)));
    }
private slots:
    void routeCalculated(QGeoRouteReply *reply)
    {
        // A route request can ask for several alternative routes ...
        if (reply->routes().size() != 0) {
            // ... but by default it will only get a single route
            QGeoRoute route = reply->routes().at(0);
            //... now we have to make use of the route ...
        }
        reply->deleteLater();
    }
    void routeError(QGeoRouteReply *reply, QGeoRouteReply:Error error, const QString &errorString)
    {
        // ... inform the user that an error has occurred ...
        reply->deleteLater();
    }
};
											

PySide2.QtLocation.QGeoRoutingManager. calculateRoute ( request ) ¶

参数

request – QGeoRouteRequest

返回类型

QGeoRouteReply

Begins the calculation of the route specified by request .

A QGeoRouteReply object will be returned, which can be used to manage the routing operation and to return the results of the operation.

This manager and the returned QGeoRouteReply object will emit signals indicating if the operation completes or if errors occur.

Once the operation has completed, routes can be used to retrieve the calculated route or routes.

若 request includes features which are not supported by this manager, as reported by the methods in this manager, then a UnsupportedOptionError will occur.

The user is responsible for deleting the returned reply object, although this can be done in the slot connected to finished() , error() , finished() or error() with deleteLater() .

PySide2.QtLocation.QGeoRoutingManager. error ( reply , error [ , errorString="" ] ) ¶

参数

• reply – QGeoRouteReply

• error – Error

• errorString – unicode

PySide2.QtLocation.QGeoRoutingManager. finished ( reply ) ¶

参数

reply – QGeoRouteReply

PySide2.QtLocation.QGeoRoutingManager. locale ( ) ¶

返回类型

QLocale

Returns the locale used to hint to this routing manager about what language to use for addresses and instructions.

另请参阅

setLocale()

PySide2.QtLocation.QGeoRoutingManager. managerName ( ) ¶

返回类型

unicode

Returns the name of the engine which implements the behaviour of this routing manager.

The combination of and managerVersion() should be unique amongst the plugin implementations.

PySide2.QtLocation.QGeoRoutingManager. managerVersion ( ) ¶

返回类型

int

Returns the version of the engine which implements the behaviour of this routin manager.

The combination of managerName() and should be unique amongst the plugin implementations.

PySide2.QtLocation.QGeoRoutingManager. measurementSystem ( ) ¶

返回类型

MeasurementSystem

Returns the measurement system used by this manager.

若 setMeasurementSystem() has been called then the value returned by this function may be different to that returned by locale() . measurementSystem() . In which case the value returned by this function is what will be used by the manager.

另请参阅

setMeasurementSystem() setLocale()

PySide2.QtLocation.QGeoRoutingManager. setLocale ( locale ) ¶

参数

locale – QLocale

Sets the locale to be used by this manager to locale .

If this routing manager supports returning addresses and instructions in different languages, they will be returned in the language of locale .

The locale used defaults to the system locale if this is not set.

另请参阅

locale()

PySide2.QtLocation.QGeoRoutingManager. setMeasurementSystem ( system ) ¶

参数

system – MeasurementSystem

Sets the measurement system used by this manager to system .

The measurement system can be set independently of the locale. Both setLocale() and this function set the measurement system. The value set by the last function called will be used.

另请参阅

measurementSystem() locale() setLocale()

PySide2.QtLocation.QGeoRoutingManager. supportedFeatureTypes ( ) ¶

返回类型

FeatureTypes

Returns the types of features that this manager can take into account during route planning.

PySide2.QtLocation.QGeoRoutingManager. supportedFeatureWeights ( ) ¶

返回类型

FeatureWeights

Returns the weightings which this manager can apply to different features during route planning.

PySide2.QtLocation.QGeoRoutingManager. supportedManeuverDetails ( ) ¶

返回类型

ManeuverDetails

Returns the levels of detail for navigation maneuvers which can be requested by this manager.

PySide2.QtLocation.QGeoRoutingManager. supportedRouteOptimizations ( ) ¶

返回类型

RouteOptimizations

Returns the route optimizations supported by this manager.

PySide2.QtLocation.QGeoRoutingManager. supportedSegmentDetails ( ) ¶

返回类型

SegmentDetails

Returns the levels of detail for routing segments which can be requested with this manager.

PySide2.QtLocation.QGeoRoutingManager. supportedTravelModes ( ) ¶

返回类型

TravelModes

Returns the travel modes supported by this manager.

PySide2.QtLocation.QGeoRoutingManager. updateRoute ( route , position ) ¶

参数

• route – QGeoRoute

• position – QGeoCoordinate

返回类型

QGeoRouteReply

Begins the process of updating route based on the current position position .

A QGeoRouteReply object will be returned, which can be used to manage the routing operation and to return the results of the operation.

This manager and the returned QGeoRouteReply object will emit signals indicating if the operation completes or if errors occur.

If supportsRouteUpdates() returns false an UnsupportedOptionError will occur.

Once the operation has completed, routes can be used to retrieve the updated route.

The returned route could be entirely different to the original route, especially if position is far away from the initial route. Otherwise the route will be similar, although the remaining time and distance will be updated and any segments of the original route which have been traversed will be removed.

The user is responsible for deleting the returned reply object, although this can be done in the slot connected to finished() , error() , finished() or error() with deleteLater() .