RouteTrackerLocationDataSource QML Type

A location data source that uses a route tracker and a generic location data source to output locations snapped to a route. More...

• List of all members, including inherited members

Properties

• locationDataSource : AbstractLocationDataSource
• routeTracker : RouteTracker

Signals

• locationDataSourceChanged()
• routeTrackerChanged()

Detailed Description

Setting the RouteTrackerLocationDataSource is optional when desiring to have the location display symbol navigate along a route. Using this object provides the benefit of having the current location snapped to the route polyline during navigation. If the RouteTrackerLocationDataSource is not used, you may notice that the actual GPS location tends to wander off the route polyline due to the accuracy provided by the GPS unit.

No distance tolerance needs to be specified to enable the snapping effect of having the location display symbol follow along the route polyline. An internal algorithm is used by the RouteTrackerLocationDataSource to determine if location is 'on route' or 'off route'. If the location is seen as 'on route' then snapping will occur, otherwise the output location will be the original input GPS location. If it is determined that the tracking along the route is no longer needed the RouteTrackerLocationDataSource's stop method can be called or the LocationDisplay can be reset to a different data source.

To provide some insight on how the RouteTrackerLocationDataSource works, the data source will pass the locations from the this data source's locationChanged locationChanged event to the RouteTracker::trackLocation. The TrackingStatus::displayLocation will then be returned in this data source's locationChanged event.

To control the orientation of the location display symbol as it navigates along a route refer to the MapView::locationDisplay class.

See also AbstractLocationDataSource.

Property Documentation

Signal Documentation