static public List <Card> GetRandomCards(int numCards)
{
// optimized way of getting a full deck
if (numCards == 52)
{
return(GetRandomDeck());
}
string suits = "HSCD";
string ranks = "23456789TJQKA";
List <Card> cards = new List <Card>(numCards);
string suit, rank;
while (cards.Count < numCards)
{
// Generate a card and make sure we don't already have it
do
{
suit = suits[Randomizer.IntLessThan(4)].ToString();
rank = ranks[Randomizer.IntLessThan(13)].ToString();
} while (cards.Any(c => c.Rank == rank && c.Suit == suit));
cards.Add(new Card(rank, suit));
}
return(cards);
}
static public List <Card> GetRandomDeck()
{
// initially populate
List <Card> deck = new List <Card>(52);
foreach (Card.Ranks rank in Enum.GetValues(typeof(Card.Ranks)))
{
foreach (Card.Suits suit in Enum.GetValues(typeof(Card.Suits)))
{
var card = new Card(rank, suit);
deck.Add(card);
}
}
// then shuffle using Fisher-Yates: one pass through, swapping the current card with a random one below it
for (int i = 51; i > 1; i--)
{
int swapWith = Randomizer.IntLessThan(i);
Card hold = deck[i];
deck[i] = deck[swapWith];
deck[swapWith] = hold;
}
return(deck);
}
public void Shuffle()
{
// then shuffle using Fisher-Yates: one pass through, swapping the current card with a random one below it
int start = Cards.Count - 1;
var randomizer = new Randomizer();
for (int i = start; i > 1; i--)
{
int swapWith = randomizer.IntLessThan(i);
Card hold = Cards[i];
Cards[i] = Cards[swapWith];
Cards[swapWith] = hold;
}
currentCard = 0;
}
// Selection Routines -----------------------------------------------
private Strategy TournamentSelectParent()
{
var randomizer = new Randomizer(); // thread-specific version
Strategy result = null;
float bestFitness = float.MinValue;
for (int i = 0; i < currentEngineParams.TourneySize; i++)
{
int index = randomizer.IntLessThan(currentEngineParams.PopulationSize);
var randomCandidate = currentGeneration[index];
var fitness = randomCandidate.Fitness;
bool isFitnessBetter = fitness > bestFitness;
if (isFitnessBetter)
{
result = randomCandidate;
bestFitness = fitness;
}
}
return(result);
}
private int GetRandomRankIndex()
{
return(randomizer.IntLessThan(Card.HighestRankIndex));
}
