public static Entity ImportEntity([NotNull] Game game, [NotNull] Stream inputStream, [NotNull] EntityManager manager)
{
if (manager == null)
{
throw new ArgumentNullException(nameof(manager));
}
var protoEntity = new ProtoEntity();
protoEntity = Import(game, inputStream, protoEntity);
//the block of code below is a somewhat hacky way of fixing a problem where an entity has a datablob that refers back to the entity.
//eg a faction entitiy with a NameDB. in such cases the Import above creates an empty entity because of the NameDB's reference.
//then Entity.Create below checks for an exsisting entity guid, finds it, then returns an entity with a new GUID.
//this then gives us two entities, one with the correct guid but with no datablobs, and a second one with a new different guid and all the datablobs.
//checking if the datablob count is 0 is a poor and not guarenteed way of seeing if the entity hasn't been created some other way previously.
//I'm wondering if we shouldn't throw an exception if we try to add an entity with the same guid, instead of just changing the guid.
Entity entity;
if (manager.FindEntityByGuid(protoEntity.Guid, out entity) && entity.DataBlobs.Count == 0)
{
manager.RemoveEntity(entity);
}
entity = Entity.Create(manager, protoEntity);
game.PostGameLoad();
return(entity);
}
/// <summary>
/// This asteroid was destroyed, see if it is big enough for child asteroids to spawn, and if so spawn them.
/// </summary>
/// <param name="Asteroid"></param>
internal static void SpawnSubAsteroids(Entity Asteroid, DateTime atDateTime)
{
Game game = Asteroid.Manager.Game;
MassVolumeDB ADB = Asteroid.GetDataBlob <MassVolumeDB>();
//const double massDefault = 1.5e+12; //150 B tonnes?
const double massThreshold = 1.5e+9; //150 M tonnes?
if (ADB.Mass > massThreshold)
{
//spawn new asteroids. call the asteroid factory?
double newMass = ADB.Mass * 0.4; //add a random factor into this? do we care? will mass be printed to the player?
OrbitDB origOrbit = Asteroid.GetDataBlob <OrbitDB>();
PositionDB pDB = Asteroid.GetDataBlob <PositionDB>();
EntityManager mySystem = Asteroid.Manager;
var origVel = OrbitProcessor.AbsoluteOrbitalVector_AU(origOrbit, atDateTime);
//public static Entity CreateAsteroid(StarSystem starSys, Entity target, DateTime collisionDate, double asteroidMass = -1.0)
//I need the target entity, the collisionDate, and the starSystem. I may have starsystem from guid.
//Ok so this should create the asteroid without having to add the new asteroids to a list. as that is done in the factory.
Entity newAsteroid1 = AsteroidFactory.CreateAsteroid4(pDB.AbsolutePosition_AU, origOrbit, atDateTime, newMass);
//var newOrbit = OrbitDB.FromVector(origOrbit.Parent, )
Entity newAsteroid2 = AsteroidFactory.CreateAsteroid4(pDB.AbsolutePosition_AU, origOrbit, atDateTime, newMass);
mySystem.RemoveEntity(Asteroid);
//Randomize the number of created asteroids?
}
else
{
//delete the existing asteroid.
PositionDB pDB = Asteroid.GetDataBlob <PositionDB>();
StarSystem mySystem;
if (!game.Systems.TryGetValue(pDB.SystemGuid, out mySystem))
{
throw new GuidNotFoundException(pDB.SystemGuid);
}
mySystem.RemoveEntity(Asteroid);
}
}