private void PredictIntersection(SourceIntersections sourceIntersectionsEntry, int segmentIndex, OrbitalBody orbitalBody, Vector2 orbitalPosition, Vector2 orbitalVelocity, float timeToPosition, Trajectory trajectory, Color intersectionColor)
{
// Calculate time of flight of current object to destination
Vector2 worldDestination = sourceIntersectionsEntry.SegmentIntersections[segmentIndex].ClosestPoint;
Vector2 localDestination = (worldDestination - trajectory.ParentGravitySource.Position).RotateVector(-trajectory.ArgumentOfPeriapsis);
float timeOfFlight = timeToPosition + OrbitalMechanics.UniversalVariableMethod.CalculateTimeOfFlight(orbitalPosition, orbitalVelocity, localDestination, trajectory.EccentricityVector, trajectory.ParentGravitySource.Mass);
if (float.IsNaN(timeOfFlight))
{
// timeOfFlight not properly calculated. hide sprites.
sourceIntersectionsEntry.HideIntersectionObjects(segmentIndex);
return;
}
// Plot current object's future position
sourceIntersectionsEntry.InitiateIntersectionSprite(segmentIndex, sourceIntersectionsEntry.SegmentIntersections[segmentIndex].ClosestPoint, intersectionColor, true);
// Plot this source object's position at timeOfFlight
Vector2 predictedWorldPosition = sourceIntersectionsEntry.Source.PredictPosition(timeOfFlight);
sourceIntersectionsEntry.InitiateIntersectionSprite(segmentIndex, predictedWorldPosition, intersectionColor, false);
StartNewIntersectionCoroutine(orbitalBody, timeOfFlight, trajectory, sourceIntersectionsEntry, segmentIndex);
}
private void UpdateNearbySourceIntersections(GravitySource gravitySource)
{
if (gravitySource != currentGravitySource)
{
// Gravity source changed. Re-initialize source intersections
currentGravitySource = gravitySource;
InitializeSourceIntersections();
return;
}
// Update source intersection entries
for (int i = 0; i < sourceIntersections.Count; i++)
{
SourceIntersections thisSourceIntersectionEntry = sourceIntersections[i];
// Hide all intersection sprites
thisSourceIntersectionEntry.HideIntersectionObjects();
// Stop coroutines running for each existing segment intersection
for (int j = 0; j < thisSourceIntersectionEntry.IntersectionCount; j++)
{
IEnumerator thisRoutine = thisSourceIntersectionEntry.intersectionCoroutines[j];
if (thisRoutine == null)
{
continue;
}
StopCoroutine(thisRoutine);
}
// Update this entry with now valid intersection objects
SegmentIntersection[] validIntersections = GetValidSegmentIntersections(thisSourceIntersectionEntry.Source);
thisSourceIntersectionEntry.UpdateSegmentIntersections(validIntersections);
}
}
private void StopIntersectionCoroutines()
{
for (int i = 0; i < sourceIntersections.Count; i++)
{
SourceIntersections thisSourceIntersectionEntry = sourceIntersections[i];
for (int j = 0; j < thisSourceIntersectionEntry.IntersectionCount; j++)
{
StopCoroutine(thisSourceIntersectionEntry.intersectionCoroutines[j]);
}
}
}
public void PlotNearestSourceIntersections(OrbitalBody orbitalBody, Vector2 orbitalPosition, Vector2 orbitalVelocity, float timeToPosition, Trajectory trajectory)
{
// orbitalPosition/Velocity are not necessarily equivalent to orbitalBody.orbitalPosition/Velocity (ManeuverNode predicted trajectories for instance)
// Update sources considered candidates for intersection
UpdateNearbySourceIntersections(trajectory.ParentGravitySource);
for (int i = 0; i < sourceIntersections.Count; i++)
{
Color intersectionColor = sourceIntersectionColors[MathUtilities.IntModulo(i, sourceIntersectionColorCount)];
SourceIntersections sourceIntersectionsEntry = sourceIntersections[i];
for (int j = 0; j < sourceIntersectionsEntry.SegmentIntersections.Length; j++)
{
PredictIntersection(sourceIntersectionsEntry, j, orbitalBody, orbitalPosition, orbitalVelocity, timeToPosition, trajectory, intersectionColor);
}
}
}
private void UpdateIntersectionSprites(OrbitalBody orbitalBody, Trajectory trajectory, SourceIntersections sourceIntersectionsEntry, int segmentIndex)
{
// Calculate time of flight to next closest point -- FIXME: Still needed?????
if (trajectory.TrajectoryType != OrbitalMechanics.Globals.TrajectoryType.Ellipse)
{
sourceIntersectionsEntry.HideIntersectionObjects(segmentIndex);
return;
}
// Use trajectory period as timeOfFlight
float timeOfFlight = trajectory.Period;
Vector2 predictedWorldPosition = sourceIntersectionsEntry.Source.PredictPosition(timeOfFlight);
sourceIntersectionsEntry.InitiateIntersectionSprite(segmentIndex, predictedWorldPosition, false);
StartNewIntersectionCoroutine(orbitalBody, trajectory.Period, trajectory, sourceIntersectionsEntry, segmentIndex);
}
private void StartNewIntersectionCoroutine(OrbitalBody orbitalBody, float timeOfFlight, Trajectory trajectory, SourceIntersections sourceIntersectionsEntry, int segmentIndex)
{
IEnumerator timeOfFlightEnum = TimerToPosition(orbitalBody, timeOfFlight, trajectory, sourceIntersectionsEntry, segmentIndex);
StartCoroutine(timeOfFlightEnum);
// Adding reference to this source intersections entry
sourceIntersectionsEntry.intersectionCoroutines[segmentIndex] = timeOfFlightEnum;
}
private IEnumerator TimerToPosition(OrbitalBody orbitalBody, float time, Trajectory trajectory, SourceIntersections sourceIntersectionsEntry, int segmentIndex)
{
// Waits until interval expires, then sets bool back to false
yield return(new WaitForSeconds(time));
// Recalculate time of flight for orbitalBody to reach orbitalBodyPosition and then source's predicted position
UpdateIntersectionSprites(orbitalBody, trajectory, sourceIntersectionsEntry, segmentIndex);
}
