public static double ProjectedLength(this LapViewModel lap)
{
var geographicLapDataPoints = lap.DataPoints.Where(dp => dp.Latitude.HasValue && dp.Longitude.HasValue);
if (!geographicLapDataPoints.Any())
{
return(0d);
}
GeographyPoint firstGeographyPoint = null;
GeographyPoint lastGeographyPoint = null;
double length = geographicLapDataPoints.Aggregate(Tuple.Create(0d, (GeographyPoint)null), (a, b) =>
{
var currentGeoPoint = b.AsGeographyPoint();
if (firstGeographyPoint == null)
{
firstGeographyPoint = currentGeoPoint;
}
lastGeographyPoint = currentGeoPoint;
double distance = a.Item2 == null || (a.Item2.Latitude == currentGeoPoint.Latitude && a.Item2.Longitude == currentGeoPoint.Longitude)
? a.Item1
: a.Item1 + a.Item2.Distance(currentGeoPoint);
return(Tuple.Create(distance, currentGeoPoint));
}, a => a.Item1);
// Add distance between last and first points to complete circuit
if (lastGeographyPoint != null)
{
length += lastGeographyPoint.Distance(firstGeographyPoint);
}
return(length);
}
public static double GetDistance(GeographyPoint point1, GeographyPoint point2)
{
if (point1 == null)
{
throw new ArgumentNullException("point1");
}
if (point2 == null)
{
throw new ArgumentNullException("point2");
}
return(point1.Distance(point2).Value);
}