public int calculateStepToPerformSwap() {
double pedestrianDensity = calculatePerceivedDensity();
double delay_seconds =
Math.pow(pedestrianDensity * .61, 1.45) * 0.4; // Math.pow(pedestrianDensity*.61,1.43)*0.39;
double delay = delay_seconds / Constants.STEP_DURATION;
int result = (int) delay; // Constants.STEP_FOR_BIDIRECTIONAL_SWAPPING;
double probability = delay - result;
if (Lottery.simpleExtraction(probability)) result++;
return result;
}
protected ArrayList<WeightedCell> evaluate() {
double myPositionValue = getStaticFFValue(position);
double neighbourValue;
double occupation = 0.0;
double probabilitySum = 0.0;
Neighbourhood neighbourhood = getNeighbourhood();
ArrayList<WeightedCell> probabilityValues = new ArrayList<WeightedCell>();
for (int index = 0; index < neighbourhood.size(); index++) {
GridPoint neighbour = neighbourhood.get(index);
neighbourValue = getStaticFFValue(neighbour);
occupation = 0.0;
if ((!neighbour.equals(position)) && checkOccupancy(neighbour)) occupation = 1.0;
double p = utilityFunction(myPositionValue, neighbourValue, occupation);
probabilitySum += p;
probabilityValues.add(new WeightedCell(neighbour, p));
}
Lottery.normalizeProbabilities(probabilityValues, probabilitySum);
return probabilityValues;
}
protected void choose(ArrayList<WeightedCell> probabilityValues) {
WeightedCell winningCell = Lottery.pickWinner(probabilityValues);
if (winningCell == null) nextpos = position;
else nextpos = new GridPoint(winningCell.x, winningCell.y);
}
