/// <summary>
/// Calculate time for midnight.
/// </summary>
private static double ComputeMidnightTime(Midnight method, double fajr, double sunrise, double sunset)
{
var duration = method == Midnight.Jafari ? DateTimeMath.ComputeDuration(fajr, sunset) : DateTimeMath.ComputeDuration(sunrise, sunset);
var midnightTime = sunset + (duration / 2.0);
return(midnightTime);
}
/// <summary>
/// Estimates the duration of a transaction based on its segments.
/// </summary>
/// <returns>An estimate of the duration of a transaction.</returns>
private static TimeSpan GetEstimatedTransactionDuration(IInternalTransaction internalTransaction, Segment lastStartedSegment, Segment lastFinishedSegment)
{
if (lastStartedSegment == null && lastFinishedSegment == null)
{
return(TimeSpan.FromMilliseconds(1));
}
var immutableTransaction = internalTransaction.ConvertToImmutableTransaction();
var lastStartedSegmentEndTime = lastStartedSegment?.CalculatedRelativeEndTime ?? new TimeSpan();
var lastFinishedSegmentEndTime = lastFinishedSegment?.CalculatedRelativeEndTime ?? new TimeSpan();
var maxEndTime = DateTimeMath.Max(lastStartedSegmentEndTime, lastFinishedSegmentEndTime);
return(maxEndTime);
}
/// <summary>
/// Adjust calculated prayer time to high latitude adjustment.
/// </summary>
private static double AdjustForHighLatitude(HighLatitudeAdjustment method, double time, double baseTime, double angle, double diff, Direction direction)
{
// Compute night fraction and duration.
var nightFraction = AstronomyMath.GetNightFraction(method, angle, diff);
var duration = direction == Direction.Clockwise
? DateTimeMath.ComputeDuration(time, baseTime)
: DateTimeMath.ComputeDuration(baseTime, time);
// Copy reference;
var newTime = time;
if (duration > nightFraction)
{
var adjustment = direction == Direction.Clockwise ? nightFraction : -nightFraction;
newTime = baseTime + adjustment;
}
return(newTime);
}
public void TestComputeDurationFrom10To23()
{
Assert.Equal(13.0, DateTimeMath.ComputeDuration(23.0, 10.0), 5);
}
public void TestFixHourPositive27()
{
Assert.Equal(3.0, DateTimeMath.FixHour(27.0), 5);
}
public void TestFixHourPositive10()
{
Assert.Equal(10.0, DateTimeMath.FixHour(10.0), 5);
}
public void TestFixHourNegative10()
{
Assert.Equal(14.0, DateTimeMath.FixHour(-10.0), 5);
}
public void TestFixHourNegative36()
{
Assert.Equal(12.0, DateTimeMath.FixHour(-36.0), 5);
}
