//kreiranje nove generacije od selektovanih jedinki
public static List <SpaceShip> CreateGeneration(List <SpaceShip> selectedPopulation)
{
int generationSize = 0;
List <SpaceShip> newGeneration = new List <SpaceShip>();
Random r = new Random(Guid.NewGuid().GetHashCode());
while (generationSize < GenerationSize - ElitePopulation)
{
List <SpaceShip> parents = selectedPopulation.OrderBy(x => r.Next()).Take(2).ToList();
SpaceShip p1 = parents[0]; SpaceShip p2 = parents[1];
//dobijaju se deca ukrstanjem
List <SpaceShip> children = new List <SpaceShip>();
if (CrossoverMethod == "onepoint")
{
children = CrossoverOnePoint(p1, p2);
}
else if (CrossoverMethod == "twopoints")
{
children = CrossoverTwoPoints(p1, p2);
}
SpaceShip c1 = children[0]; SpaceShip c2 = children[1];
//deca mutiraju
c1 = Mutate(c1); c2 = Mutate(c2);
//dodaju se u generaciju
newGeneration.Add(c1); newGeneration.Add(c2);
generationSize += 2;
}
return(newGeneration);
}
//Mutacija treba da spreci da jedinke iz populacije postanu suvise slicne i da pomogne u obnavljanju genetskog materijala
//ukoliko u jednoj generaciji sve jedinke imaju istu vrednost jednog gena, onda taj gen samo ukrstanjem nikada ne bi mogao da se promeni
//omogucavaju razmatranje novih delova prostrora pretrage u nadi da ce se naici na globalni ekstremum
//Ukoliko je verovatnoca mutacije velika, onda usmeravanje pretrage postaje preslabo i ona pocinje da lici na slucajnu pretragu
public static SpaceShip Mutate(SpaceShip ship)
{
Random r = new Random(Guid.NewGuid().GetHashCode());
double randomValue = r.NextDouble();
if (randomValue < MutationRate)
{
int randomIndex = r.Next(SpaceShip.ChromosomeSize);
//Console.WriteLine(randomIndex);
int actionR = r.Next(4);
//Console.WriteLine("akcija" + actionR);
if (actionR == 0)
{
Tuple <string, int> newRun = new Tuple <string, int>("NT", r.Next(100, 400));
ship.run[randomIndex] = newRun;
}
if (actionR == 1)
{
Tuple <string, int> newRun = new Tuple <string, int>("RL", r.Next(10, 25));
ship.run[randomIndex] = newRun;
}
if (actionR == 2)
{
Tuple <string, int> newRun = new Tuple <string, int>("RR", r.Next(10, 25));
ship.run[randomIndex] = newRun;
}
if (actionR == 3)
{
Tuple <string, int> newRun = new Tuple <string, int>("TH", r.Next(10, 25));
ship.run[randomIndex] = newRun;
}
}
return(ship);
}
public int CompareTo(object obj)
{
if (obj == null)
{
return(1);
}
SpaceShip sp = obj as SpaceShip;
return(GAFitnessFunction.CompareTo(GAFitnessFunction));
}
//jednopoziciono ukrstanje sa nasumicnom tackom
public static List <SpaceShip> CrossoverOnePoint(SpaceShip parent1, SpaceShip parent2)
{
//public List<Tuple<string, int>> run
List <SpaceShip> children = new List <SpaceShip>(2);
Random r = new Random(Guid.NewGuid().GetHashCode());
int breakPoint = r.Next(1, SpaceShip.ChromosomeSize - 1);
List <Tuple <string, int> > child1Run = parent1.run.Take(breakPoint).ToList().Concat(parent2.run.Skip(breakPoint).ToList()).ToList();
List <Tuple <string, int> > child2Run = parent2.run.Take(breakPoint).ToList().Concat(parent1.run.Skip(breakPoint).ToList()).ToList();
SpaceShip child1 = new SpaceShip(child1Run, GeneticAlgorithm.MapStartX, GeneticAlgorithm.MapStartY);
SpaceShip child2 = new SpaceShip(child2Run, GeneticAlgorithm.MapStartX, GeneticAlgorithm.MapStartY);
children.Add(child1);
children.Add(child2);
return(children);
}
//jednopoziciono ukrstanje sa nasumicnom tackom
public static List <SpaceShip> CrossoverTwoPoints(SpaceShip parent1, SpaceShip parent2)
{
//public List<Tuple<string, int>> run
List <SpaceShip> children = new List <SpaceShip>(2);
List <int> breakPoints = GetNRandomIntegers(2, SpaceShip.ChromosomeSize - 1, 1);
breakPoints.Sort();
List <Tuple <string, int> > child1Run = parent1.run.Take(breakPoints[0]).ToList().Concat(parent2.run.Skip(breakPoints[0]).Take(breakPoints[1] - breakPoints[0]).ToList()).ToList().Concat(parent1.run.Skip(breakPoints[1]).ToList()).ToList();
List <Tuple <string, int> > child2Run = parent2.run.Take(breakPoints[0]).ToList().Concat(parent1.run.Skip(breakPoints[0]).Take(breakPoints[1] - breakPoints[0]).ToList()).ToList().Concat(parent2.run.Skip(breakPoints[1]).ToList()).ToList();
SpaceShip child1 = new SpaceShip(child1Run, GeneticAlgorithm.MapStartX, GeneticAlgorithm.MapStartY);
SpaceShip child2 = new SpaceShip(child2Run, GeneticAlgorithm.MapStartX, GeneticAlgorithm.MapStartY);
children.Add(child1);
children.Add(child2);
return(children);
}
