private void LocationService_OnPositionEstimateChange(object sender, LocationService.PositionEstimateEventArgs e)
{
WifiSnifferPositioningService.PositionEstimate location = e.PositionEstimate;
//TODO: Insert a check for whether we need to shift building
//location.Building_ID != lastKnownWifiLocation
//The rest is part of an else block
mCurrentEstimatedFloor = (int)location.Altitude; //placed here because we check floor before updating location
//First check if we are even interested in receiving position updates?
if (!IsTrackingPosition)
return;
//Then check whether we need to update floor
//We change floor if this is the very first wifi location or the location is estimated
//at a new floor
bool doChangeFloor = false;
//Beware: If the locationService changes semantics to broadcasting null estimates (in case of error)
//then this null check will not be a valid indicator of a floor change
if (lastKnownWifiLocation == null) //No prior pos: We change floor
{
doChangeFloor = true;
}
else //Check for new floor
{
int prevFloor = (int)lastKnownWifiLocation.Altitude;
if (prevFloor != mCurrentEstimatedFloor)
doChangeFloor = true;
}
lastKnownWifiLocation = location;
if (doChangeFloor)
{
mCurrentSelectedFloor = mCurrentEstimatedFloor;
//Globals.ShowDialog(source, "Changing to new floor...", Globals.DURATION_SHORT);
refreshUI();
}
//the threshold based check for whether to update the location is conducted in updateNewLocation()
//as it applies to gps and wi-fi alike
updateNewLocation(location);
}
void LocationService_OnBuildingIdentificationChange(object sender, LocationService.BuildingIdentificationEventArgs e)
{
if (e.BuildingFound)
{
LocationService.DownloadRadioMap(e.BuildingId);
}
else
{
if (OnNoBuildingFound != null)
OnNoBuildingFound(this, EventArgs.Empty);
}
}
