public static Relation FirstRelationSince(PlanetId SuperiorId, PlanetId InferiorId, Double sinceJulian)
{
reorder(ref SuperiorId, ref InferiorId);
double orbToNext, speed, step = 100.0, time = sinceJulian;
Position superiorPos, inferiorPos;
int tries = 0;
Angle angle;
Aspects next = null;
do
{
superiorPos = Ephemeris.Geocentric[time, SuperiorId];
inferiorPos = Ephemeris.Geocentric[time, InferiorId];
angle = inferiorPos.Longitude - superiorPos.Longitude;
speed = inferiorPos.LongitudeVelocity - superiorPos.LongitudeVelocity;
if (next == null)
{
next = Aspects.NextAspect(angle, speed > 0);
double temp = next.OrbOf(angle);
step = -temp / speed;
if (time + step < sinceJulian)
{
next = Aspects.NextAspect(angle, speed < 0);
}
}
orbToNext = next.OrbOf(angle);
if (Math.Abs(orbToNext) < Negligible)
{
return(new Relation(Ephemeris.UtcFromJulianDay(time), superiorPos, inferiorPos));
}
step = -orbToNext / speed;
if (step > MaxStep)
{
step = MaxStep;
}
else if (step < -MaxStep)
{
step = -MaxStep;
}
time += step;
tries++;
} while (tries < maxTry);
return(null);
}
//public RelationFinder(DateTimeOffset time, PlanetId one, PlanetId another, MatchingMode mode)
//{
// SuperiorId = (one < another) ? one : another;
// InferiorId = (one < another) ? another : one;
// ReferenceTime = time;
// DateTime theDate = time.UtcDateTime.Date;
// switch(mode)
// {
// case MatchingMode.AroundTheDay:
// {
// DateTime previous = theDate - DefaultDayPeriod;
// DateTime endOfNext = theDate.AddDays(1) + DefaultDayPeriod;
// startJulianUtc = Utilities.ToJulianDay(new DateTimeOffset(previous, TimeSpan.Zero));
// endJulianUtc = Utilities.ToJulianDay(new DateTimeOffset(endOfNext, TimeSpan.Zero));
// if (previous.DayOfWeek == DayOfWeek.Saturday || previous.DayOfWeek == DayOfWeek.Sunday)
// {
// int dif = (previous.DayOfWeek + 7 - DayOfWeek.Friday) % 7;
// startJulianUtc -= dif;
// }
// if (endOfNext.DayOfWeek == DayOfWeek.Sunday || endOfNext.DayOfWeek == DayOfWeek.Monday)
// {
// int dif = (8 + DayOfWeek.Monday - endOfNext.DayOfWeek) % 7;
// endJulianUtc += dif;
// }
// break;
// }
// case MatchingMode.WithinTheDay:
// {
// startJulianUtc = Utilities.ToJulianDay(new DateTimeOffset(theDate, TimeSpan.Zero));
// endJulianUtc = startJulianUtc + DefaultDayPeriod.TotalDays;
// break;
// }
// case MatchingMode.WithinTheWeek:
// {
// int daysToLastSaturday = (7 + theDate.DayOfWeek - DayOfWeek.Saturday) % 7;
// startJulianUtc = Utilities.ToJulianDay(new DateTimeOffset(theDate, TimeSpan.Zero)) - daysToLastSaturday;
// //int daysToNextSaturday = (7 + DayOfWeek.Monday - theDate.DayOfWeek) % 7;
// //endJulianUtc = referedJulianUtc + daysToNextSaturday + DefaultDayPeriod;
// endJulianUtc = startJulianUtc + 7 + DefaultDayPeriod.TotalDays;
// break;
// }
// case MatchingMode.WithinTheMonth:
// {
// DateTimeOffset firstOfMonth = new DateTimeOffset(theDate.Year, theDate.Month, 1, 0, 0, 0, TimeSpan.Zero);
// startJulianUtc = Utilities.ToJulianDay(firstOfMonth) - DefaultDayPeriod.TotalDays;
// DateTimeOffset firstOfNextMonth = new DateTimeOffset(theDate.Year, theDate.Month + 1, 1, 0, 0, 0, TimeSpan.Zero);
// endJulianUtc = Utilities.ToJulianDay(firstOfNextMonth) + DefaultDayPeriod.TotalDays;
// break;
// }
// case MatchingMode.WithinTheYear:
// {
// DateTimeOffset firstOfYear = new DateTimeOffset(theDate.Year, 1, 1, 0, 0, 0, TimeSpan.Zero);
// startJulianUtc = Utilities.ToJulianDay(firstOfYear) - DefaultDayPeriod.TotalDays;
// DateTimeOffset firstOfNextYear = new DateTimeOffset(theDate.Year + 1, 1, 1, 0, 0, 0, TimeSpan.Zero);
// endJulianUtc = Utilities.ToJulianDay(firstOfNextYear) + DefaultDayPeriod.TotalDays;
// break;
// }
// case MatchingMode.WithinTheDecade:
// {
// int year = theDate.Year - theDate.Year % 100;
// DateTimeOffset firstOfCenturay = new DateTimeOffset(year, 1, 1, 0, 0, 0, TimeSpan.Zero);
// startJulianUtc = Utilities.ToJulianDay(firstOfCenturay);
// DateTimeOffset firstOfNextCentuary = new DateTimeOffset(year + 100, 1, 1, 0, 0, 0, TimeSpan.Zero);
// endJulianUtc = Utilities.ToJulianDay(firstOfNextCentuary);
// break;
// }
// default:
// throw new NotImplementedException();
// }
// Position superiorStart = Utilities.PositionOf(startJulianUtc, SuperiorId, SeFlg.DEFAULT);
// Position inferiorStart = Utilities.PositionOf(startJulianUtc, InferiorId, SeFlg.DEFAULT);
// CachedPositions = new SortedDictionary<double, PositionPair>(new JulianUtComparer());
// CachedPositions.Add(startJulianUtc, new PositionPair(superiorStart, inferiorStart));
//}
#endregion
//private Aspects nextAspect(Angle angle, Double velocity)
//{
// Aspects temp = (velocity > 0) ? Aspects.NextAspectOf(angle) : Aspects.PreviousAspectOf(angle);
// if (Math.Abs(temp.OrbOf(angle)) > 0.001)
// return temp;
// else
// return (velocity > 0) ? Aspects.NextAspectOf(temp) : Aspects.PreviousAspectOf(temp);
//}
//private Aspects previousAspect(Angle angle, Double velocity)
//{
// Aspects temp = (velocity <= 0) ? Aspects.NextAspectOf(angle) : Aspects.PreviousAspectOf(angle);
// if (Math.Abs(temp.OrbOf(angle)) > 0.001)
// return temp;
// else
// return (velocity > 0) ? Aspects.PreviousAspectOf(temp) : Aspects.NextAspectOf(temp);
//}
private Relation nextRelation(Double sinceJulian)
{
double orbNext, speed, step = 100.0, time;
//KeyValuePair<double, PositionPair> last = CachedPositions.Last();
time = sinceJulian;
Position superiorPos = Utilities.PositionOf(time, SuperiorId, SeFlg.DEFAULT);
Position inferiorPos = Utilities.PositionOf(time, InferiorId, SeFlg.DEFAULT);
Angle angle = inferiorPos.Longitude - superiorPos.Longitude;
speed = inferiorPos.LongitudeVelocity - superiorPos.LongitudeVelocity;
Aspects next = Aspects.NextAspect(angle, speed > 0);
orbNext = next.OrbOf(angle);
for (int tryCount = 0; tryCount < maxTry; tryCount++)
{
if (Math.Abs(orbNext) < Relation.Negligible)
{
CachedPositions.Add(time, new PositionPair(superiorPos, inferiorPos));
//return true;
return(new Relation(Utilities.UtcFromJulianDay(time), superiorPos, inferiorPos));
}
step = -orbNext / speed;
if (time + step < sinceJulian)
{
return(null);
}
time += step;
if (time > During.EndJulianUtc)
{
return(null);
}
superiorPos = Utilities.PositionOf(time, SuperiorId, SeFlg.SEFLG_SPEED);
inferiorPos = Utilities.PositionOf(time, InferiorId, SeFlg.SEFLG_SPEED);
angle = inferiorPos.Longitude - superiorPos.Longitude;
speed = inferiorPos.LongitudeVelocity - superiorPos.LongitudeVelocity;
orbNext = next.OrbOf(angle);
}
return(null);
}
