/// <summary>
/// Filters the specified timed points.
/// </summary>
/// <param name="timedPoints">The timed points.</param>
/// <returns>
/// An average of the last N points (as long as they fall within a given timespan from <see cref="DateTime.Now" />).
/// </returns>
public override Point?Filter(TimedPoints timedPoints)
{
if (timedPoints == null)
{
return(null);
}
var withinTimeSpan = timedPoints.Where(pair => DateTime.Now - pair.Key <= this.timeSpan).ToList();
if (withinTimeSpan.Count < this.numberOfPoints)
{
return(null);
}
var pointsToAverage = withinTimeSpan.OrderByDescending(pair => pair.Key).Take(this.numberOfPoints).ToList();
var averageX = pointsToAverage.Select(pair => pair.Value.X).Average();
var averageY = pointsToAverage.Select(pair => pair.Value.Y).Average();
return(new Point(averageX, averageY));
}
