private void ComputeStatistics()
{
TrackStatistics trackStatistics = new TrackStatistics();
for (int i = 0; i < Waypoints.Count - 1; i++)
{
Waypoint w1 = Waypoints[i];
Waypoint w2 = Waypoints[i + 1];
double distance = Waypoint.ComputeDistance(w1, w2, out double elevationChange);
if (elevationChange < 0)
{
trackStatistics.AbsoluteDescent -= elevationChange;
}
else
{
trackStatistics.AbsoluteClimb += elevationChange;
}
TimeSpan timeBetween = w2.Time - w1.Time;
w1.Speed = distance / (1000.0 * timeBetween.TotalHours);
if (w1.Speed > motionSpeedThreshold)
{
trackStatistics.TimeInMotion += timeBetween;
}
trackStatistics.Length += distance;
}
trackStatistics.Length /= 1000; // convert to km
TimeSpan duration = Waypoints[Waypoints.Count - 1].Time - Waypoints[0].Time;
trackStatistics.AverageSpeed = trackStatistics.Length / duration.TotalHours;
trackStatistics.AverageSpeedInMotion = trackStatistics.Length / trackStatistics.TimeInMotion.TotalHours;
statisics = trackStatistics;
}
/// <summary>
/// If waypoints are altered manually, previously computed track statistics might become invalid and you need to call this method.
/// </summary>
public void ResetStatistics()
{
this.statisics = null;
}