/// <summary>
/// Retrieves all particles in the same cell as the given particle. Does not include the given particle!
/// </summary>
/// <param name="particle">Particle identifying the cell to retrieve from</param>
/// <returns>All partciles in the same cell</returns>
public List<SwarmParticle> GetAdjacentParticlesWithoutGivenParticle(SwarmParticle particle)
{
Tuple<int, int> cellIndices = ParticlePositionToCellIndices(particle.GetPosition());
List<SwarmParticle> neighbourhood = Mesh[cellIndices.Item1, cellIndices.Item2];
neighbourhood.Remove(particle);
return neighbourhood;
}
private void UpdateParticleFitness(SwarmParticle particle)
{
double currentFitness = FitnessStrategy.GetFitness(particle.GetPosition());
double bestFitness = particle.GetOverallBestFitness();
particle.SetCurrentFitness(currentFitness);
if (currentFitness < bestFitness)
{
particle.UpdateFittestValues(currentFitness);
}
}
private void UpdateParticle(SwarmParticle particle, SwarmParticle fittestNeighbour)
{
Vector2d Translation = particle.GetTranslation();
Vector2d BestPosition = particle.GetBestLocation();
Vector2d Position = particle.GetPosition();
Translation.X = Translation.X * InertiaWeight + AccelerationConstant * GaussianRandomHelper.GetRandomValue(Mean, StandardDeviation) * (BestPosition.X - Position.X) + AccelerationConstant * GaussianRandomHelper.GetRandomValue(Mean, StandardDeviation) * (fittestNeighbour.GetPosition().X - Position.X);
Translation.Y = Translation.Y * InertiaWeight + AccelerationConstant * GaussianRandomHelper.GetRandomValue(Mean, StandardDeviation) * (BestPosition.Y - Position.Y) + AccelerationConstant * GaussianRandomHelper.GetRandomValue(Mean, StandardDeviation) * (fittestNeighbour.GetPosition().Y - Position.Y);
particle.SetTranslation(Translation);
particle.updatePosition(Translation);
UpdateParticleFitness(particle);
}
public void AddParticle(SwarmParticle particle)
{
Tuple<int, int> cellIndices = ParticlePositionToCellIndices(particle.GetPosition());
Mesh[cellIndices.Item1, cellIndices.Item2].Add(particle);
ParticleCount++;
}
private void UpdateParticleFitness(SwarmParticle particle)
{
double currentFitness = FitnessStrategy.GetFitness(particle.GetPosition());
if (currentFitness < particle.GetCurrentFitness())
{
particle.SetCurrentLocationAsBest();
}
particle.SetCurrentFitness(currentFitness);
}