public IParticle ById(ParticleType type, int id)
{
if (id == 0)
{
return(null);
}
switch (type)
{
case ParticleType.Star:
return(Stars.ById(id));
case ParticleType.Ship:
return(Ships.ById(id));
case ParticleType.Missile:
return(Missiles.ById(id));
}
throw new IndexOutOfRangeException("Unknown particle type.");
}
