private Distance GetDistanceToPlayerOrDefault(Thing t)
{
if (t == null)
{
return(null);
}
LocationVector lv = t.VectorFromPlayer;
if (lv == null || lv.Distance == null)
{
return(null);
}
return(lv.Distance);
}
/// <summary>
/// Raises the appearing event.
/// </summary>
public override void OnAppearing()
{
base.OnAppearing();
App.GPS.PositionChanged += HandlePositionChanged;
App.GPS.HeadingChanged += HandleHeadingChanged;
if (this.activeObject != null)
{
this.activeObject.PropertyChanged += HandlePropertyChanged;
}
vecDirection = null;
NotifyPropertyChanged(NamePropertyName);
#if __HTML__
NotifyPropertyChanged(HtmlSourcePropertyName);
#else
NotifyPropertyChanged(DescriptionPropertyName);
NotifyPropertyChanged(HasDescriptionPropertyName);
NotifyPropertyChanged(HasImagePropertyName);
NotifyPropertyChanged(ImageSourcePropertyName);
#endif
NotifyPropertyChanged(HasDirectionPropertyName);
UpdateHasDirection();
UpdateDirection(true);
}
/// <summary>
/// Update direction for active object
/// </summary>
/// <param name="updateDirection">Flag, if the direction should be calculated new.</param>
private void UpdateDirection(bool updateDirection)
{
if (this.activeObject == null)
{
return;
}
if (Position == null)
{
Direction = double.NegativeInfinity;
Distance = double.NegativeInfinity;
return;
}
// Do it only for zones, where we are inside
if (this.activeObject is Zone && ((Zone)this.activeObject).State == PlayerZoneState.Inside)
{
Direction = double.PositiveInfinity;
Distance = double.PositiveInfinity;
return;
}
double heading = 0;
if (Position.Heading != null)
{
// Show always to north
heading = 360.0 - (double)Position.Heading;
}
// Do it only for entries with ObjectLocation
if (this.activeObject is Zone || this.activeObject.ObjectLocation != null)
{
if (updateDirection || vecDirection == null)
{
// Calculate values for this thing
vecDirection = this.geoMathHelper.VectorToPoint(new ZonePoint(Position.Latitude, Position.Longitude, 0), this.activeObject.ObjectLocation);
}
// Set values
Direction = (double)((vecDirection.Bearing + heading) % 360);
Distance = vecDirection.Distance.Value;
}
}
private void RefreshFromVector(LocationVector v)
{
if (v == null)
{
// No distance to show.
bool distanceChanged = Distance != null;
Distance = null;
RefreshBearing(bearingFromNorth: 0);
if (!distanceChanged)
{
RefreshFromDistance(null);
}
}
else
{
// A distance to show!
Distance = v.Distance;
RefreshBearing(bearingFromNorth: v.Bearing);
}
}
