/// <summary>
/// 遗传变异
/// </summary>
/// <param name="mate"></param>
/// <returns></returns>
public override IPrey Mate(IPrey mate)
{
string childChromosome = string.Empty;
EvoString evoStringMate = mate as EvoString;
if (evoStringMate == null || (this.chromosome.Length != evoStringMate.chromosome.Length))
{
throw new Exception("Cross-species mating is not allowed ... yet!");
}
// 1. Do chromosome cross-over.
// 1. 交叉染色体
childChromosome = GenerateChromosome(this.chromosome, evoStringMate.chromosome);
// 2. Spawn child.
// 2. 生成后代
EvoString child = new EvoString(childChromosome);
// 3. Roll dice to mutate child.
// 3. 后代随机突变
if (Dice.Roll(0, (int)MAX_RAND) > MAX_RAND * MUTATION_RATE)
{
child.Mutate();
}
return(child);
}
private int EvaluateFitness(EvoString preyEvoString)
{
if (preyEvoString == null)
{
throw new Exception("Predator doesn't like this prey!");
}
return(this.target.Compare(preyEvoString));
}
public EvoStringPredator(EvoString target)
{
this.target = target;
}
/// <summary>
/// Compares EvoString genetic heritage.
/// </summary>
/// <param name="lookAlike"></param>
/// <returns>Diff between chromosomes, if chromosomes are different in lenght the delta adds up.</returns>
public int Compare(EvoString lookAlike)
{
//return StringDistanceCalculator.Levenshtein(this.chromosome, lookAlike.chromosome);
return(StringDistanceCalculator.iLevenshtein(this.chromosome, lookAlike.chromosome));
}
