internal override void ActionCommand(Game game)
{
if (!IsRunning)
{
Entity parentEntity = EntityCommanding.GetDataBlob <OrbitDB>().Parent;
Vector2 newVector = OrbitProcessor.InstantaneousOrbitalVelocityVector(EntityCommanding.GetDataBlob <OrbitDB>(), _db.ActionOnDateTime);
newVector += _db.DeltaVToExpend_AU;
var spdmps = Distance.AuToMt(newVector.Length());
Vector3 newVector3d = new Vector3(newVector.X, newVector.Y, 0);
OrbitDB newOrbit = OrbitDB.FromVector(parentEntity, EntityCommanding, newVector3d, _db.ActionOnDateTime);
/*
* if (newOrbit.Periapsis > targetSOI)
* {
* //TODO: find who's SOI we're currently in and create an orbit for that;
* }
* if (newOrbit.Apoapsis > targetSOI)
* {
* //TODO: change orbit to new parent at SOI change
* }
*/
EntityCommanding.SetDataBlob(newOrbit);
newOrbit.SetParent(parentEntity);
}
}
/// <summary>
/// This was designed so that fast moving objects will get interpolated a lot more than slow moving objects
/// so fast moving objects shouldn't loose positional acuracy when close to a planet,
/// and slow moving objects won't have processor time wasted on them by calulcating too often.
/// However this seems to be unstable and looses energy, unsure why. currently set it to just itterate/interpolate every second.
/// so currently will be using more time to get through this than neccisary.
/// </summary>
/// <param name="entity">Entity.</param>
/// <param name="deltaSeconds">Delta seconds.</param>
public static void NewtonMove(Entity entity, int deltaSeconds)
{
NewtonMoveDB newtonMoveDB = entity.GetDataBlob <NewtonMoveDB>();
PositionDB positionDB = entity.GetDataBlob <PositionDB>();
double Mass_Kg = entity.GetDataBlob <MassVolumeDB>().Mass;
double ParentMass_kg = newtonMoveDB.ParentMass;
var manager = entity.Manager;
DateTime dateTimeFrom = newtonMoveDB.LastProcessDateTime;
DateTime dateTimeNow = manager.ManagerSubpulses.StarSysDateTime;
DateTime dateTimeFuture = dateTimeNow + TimeSpan.FromSeconds(deltaSeconds);
double deltaT = (dateTimeFuture - dateTimeFrom).TotalSeconds;
double secondsToItterate = deltaT;
while (secondsToItterate > 0)
{
double speed_kms = newtonMoveDB.CurrentVector_kms.Length();
//double timeStep = Math.Max(secondsToItterate / speed_kms, 1);
//timeStep = Math.Min(timeStep, secondsToItterate);
double timeStep = 1;//because the above seems unstable and looses energy.
double distanceToParent_m = Distance.AuToMt(positionDB.GetDistanceTo(newtonMoveDB.SOIParent.GetDataBlob <PositionDB>()));
distanceToParent_m = Math.Max(distanceToParent_m, 0.1); //don't let the distance be 0 (once collision is in this will likely never happen anyway)
double gravForce = GameConstants.Science.GravitationalConstant * (Mass_Kg * ParentMass_kg / Math.Pow(distanceToParent_m, 2));
Vector3 gravForceVector = gravForce * -Vector3.Normalise(positionDB.RelativePosition_AU);
double distance = Distance.AuToKm(positionDB.RelativePosition_AU).Length();
Vector3 totalForce = gravForceVector + newtonMoveDB.ThrustVector;
Vector3 acceleration_mps = totalForce / Mass_Kg;
Vector3 newVelocity = (acceleration_mps * timeStep * 0.001) + newtonMoveDB.CurrentVector_kms;
newtonMoveDB.CurrentVector_kms = newVelocity;
Vector3 deltaPos = (newtonMoveDB.CurrentVector_kms + newVelocity) / 2 * timeStep;
//Vector4 deltaPos = newtonMoveDB.CurrentVector_kms * timeStep;
positionDB.RelativePosition_AU += Distance.KmToAU(deltaPos);
double sOIRadius_AU = OrbitProcessor.GetSOI(newtonMoveDB.SOIParent);
if (positionDB.RelativePosition_AU.Length() >= sOIRadius_AU)
{
Entity newParent;
Vector3 parentRalitiveVector;
//if our parent is a regular kepler object (normaly this is the case)
if (newtonMoveDB.SOIParent.HasDataBlob <OrbitDB>())
{
var orbitDB = newtonMoveDB.SOIParent.GetDataBlob <OrbitDB>();
newParent = orbitDB.Parent;
var parentVelocity = OrbitProcessor.InstantaneousOrbitalVelocityVector(orbitDB, entity.Manager.ManagerSubpulses.StarSysDateTime);
parentRalitiveVector = Distance.KmToAU(newtonMoveDB.CurrentVector_kms) + parentVelocity;
var pvlen = Distance.AuToKm(parentVelocity.Length());
var vlen = newtonMoveDB.CurrentVector_kms.Length();
var rvlen = Distance.AuToKm(parentRalitiveVector.Length());
}
else //if (newtonMoveDB.SOIParent.HasDataBlob<NewtonMoveDB>())
{ //this will pretty much never happen.
newParent = newtonMoveDB.SOIParent.GetDataBlob <NewtonMoveDB>().SOIParent;
var parentVelocity = newtonMoveDB.SOIParent.GetDataBlob <NewtonMoveDB>().CurrentVector_kms;
parentRalitiveVector = Distance.KmToAU(newtonMoveDB.CurrentVector_kms + parentVelocity);
}
double newParentMass = newParent.GetDataBlob <MassVolumeDB>().Mass;
double sgp = GameConstants.Science.GravitationalConstant * (newParentMass + Mass_Kg) / 3.347928976e33;
Vector3 posRalitiveToNewParent = positionDB.AbsolutePosition_AU - newParent.GetDataBlob <PositionDB>().AbsolutePosition_AU;
var dateTime = dateTimeNow + TimeSpan.FromSeconds(deltaSeconds - secondsToItterate);
var kE = OrbitMath.KeplerFromPositionAndVelocity(sgp, posRalitiveToNewParent, parentRalitiveVector, dateTime);
if (kE.Eccentricity < 1) //if we're going to end up in a regular orbit around our new parent
{
/*
* var newOrbit = OrbitDB.FromKeplerElements(
* newParent,
* newParentMass,
* Mass_Kg,
* kE,
* dateTime);
*/
var newOrbit = OrbitDB.FromVector(newParent, entity, parentRalitiveVector, dateTime);
entity.RemoveDataBlob <NewtonMoveDB>();
entity.SetDataBlob(newOrbit);
positionDB.SetParent(newParent);
var currentPos = Distance.AuToKm(positionDB.RelativePosition_AU);
var newPos = OrbitProcessor.GetPosition_AU(newOrbit, dateTime);
var newPosKM = Distance.AuToKm(newPos);
positionDB.RelativePosition_AU = newPos;
break;
}
else //else we're in a hyperbolic trajectory around our new parent, so just coninue the newtonion move.
{
positionDB.SetParent(newParent);
newtonMoveDB.ParentMass = newParentMass;
newtonMoveDB.SOIParent = newParent;
}
}
secondsToItterate -= timeStep;
}
newtonMoveDB.LastProcessDateTime = dateTimeFuture;
}