public OrbitalFrame FrameFor(FreeBody body)
{
if (body == null)
{
return(null);
}
OrbitalFrame frame = new OrbitalFrame();
// Search for cyclic references between bodies (merged frames)
var cyclicBodies =
CelestialBodies.Where(c => c.FrameId == body.Id) // for all celestials orbiting this object
.Where(c => body.CelestialContexts.Any(cc => cc.FrameId == c.Body.Id)) // for all orbiters that have a celestial-context whose frame is this object
.Select(c => c.Body); // select those orbiters
frame.Reference.Add(body);
frame.Reference.AddRange(cyclicBodies);
// Find children of merged frame celestials
var children = CelestialBodies.Where(c => frame.Reference.Any(r => r.Id == c.FrameId));
frame.CelestialBodies.AddRange(children);
frame.CelestialBodies.RemoveAll(c => frame.Reference.Any(r => r.Id == c.BodyId));
frame.CelestialBodies = frame.CelestialBodies.OrderBy(cb => cb.CenterDistance.AsMeters).ToList();
return(frame);
}
public OrbitalFrame(OrbitalFrame source)
{
Reference = new List <FreeBody>(source.Reference);
CelestialBodies = new List <CelestialBody>(source.CelestialBodies);
}