private Task NextStepAsync(CancellationToken ct = default(CancellationToken))
{
return(Task.Run(() =>
{
SimulationEventArgs args = new SimulationEventArgs();
_environment.IncreaseYear();
args.CurrentYear = _environment.Year;
//new population size
int peopleCount = (int)Math.Round(_settings.PopulationSize * Math.Pow(_populationFactor, _environment.Year));
var newPopulation = new Person[peopleCount];
//main loop
int currentPopulationSize = 0;
foreach (var person in _persons)
{
ct.ThrowIfCancellationRequested();
++currentPopulationSize;
if (currentPopulationSize > peopleCount)
{
break;
}
if (person == null)
{
continue;
}
Person child;
if (!Process(person, args, out child))
{
continue;
}
PutPerson(person, newPopulation);
if (child != null)
{
++currentPopulationSize;
if (currentPopulationSize > peopleCount)
{
break;
}
PutPerson(child, newPopulation);
}
}
_persons = newPopulation;
SimulationEvent(this, args);
}, ct));
}
private bool Process(Person person, SimulationEventArgs args, out Person child)
{
child = null;
//if too old
if (person.Age >= _settings.LifeLimit)
{
++args.NaturalDeathCount;
return(false);
}
//if man
if (person.Sex == Sex.Man)
{
return(true);
}
//if not pregnant
var pregoInfo = _settings.GetPregoInfo(person.Age);
if (pregoInfo == null)
{
return(true);
}
//get father
var father = SearchNubilityMan();
//get child
BornInfo bornInfo;
if (!args.BornInfos.TryGetValue(pregoInfo.Order, out bornInfo))
{
bornInfo = new BornInfo
{
Order = pregoInfo.Order,
MotherAge = person.Age
};
args.BornInfos.Add(bornInfo.Order, bornInfo);
}
child = GenerateChild(father, person, pregoInfo.Factor);
if (child == null)
{
++bornInfo.DeathCount;
return(false);
}
++bornInfo.BornCount;
return(true);
}