TournamentPair* RoundRobinTournament::nextPair(int gameNumber)
{
if (gameNumber >= finalGameCount())
return 0;
if (gameNumber % gamesPerEncounter() != 0)
return currentPair();
if (m_pairNumber >= m_topHalf.size())
{
m_pairNumber = 0;
setCurrentRound(currentRound() + 1);
m_topHalf.insert(1, m_bottomHalf.takeFirst());
m_bottomHalf.append(m_topHalf.takeLast());
}
int white = m_topHalf.at(m_pairNumber);
int black = m_bottomHalf.at(m_pairNumber);
m_pairNumber++;
// If 'white' or 'black' equals 'playerCount()' it means
// that it's a "bye" player, that is an empty player that
// makes the pairings easier to organize. In that case
// no game is played and we skip to the next pair.
if (white < playerCount() && black < playerCount())
return pair(white, black);
else
return nextPair(gameNumber);
}
void basicFourWayExpander::getSuccessors(int a_currentPosition, int a_parent, int a_finalPosition, map& a_map, Direction* a_direction, std::vector<std::pair<int, Direction> >& a_successors)
{
const int* oneStepMove = a_map.getOneStepMove();
for (int j = 0; j < 4; j++)
{
int nextPos = a_currentPosition + oneStepMove[j];
Direction nextDir = a_direction[j];
std::pair<int, Direction> nextPair(nextPos, nextDir);
a_successors.push_back(nextPair);
}
}
std::pair<int,int> CellList::nextPair()
{
//if we are looking in the same cell for neighbors
if (_same_cell) {
//if j exceeds the number of objects in cell c
if (!(_j < _cell[_c].getNumberOfObjects())) {
//reset j to zero for next time it enters
_j = 0;
//reset neighbor cell number and neighbor number to zero
_n = 0;
_k = 0;
_same_cell = false;
nextPair();
return _current_pair;
}
else {
//otherwise skip objects w / >= sequencer
if (_cell[_c].getContents()[_j] >= _current_pair.first) {
_j++;
nextPair();
return _current_pair;
}
else {
_current_pair.second = _cell[_c].getContents()[_j];
_j++;
return _current_pair;
}
}
}
else {
//if k exceeds the number of objects in cell c neighbor n
if(!(_k<_cell[_cell[_c].getNeighbors()[_n]].getNumberOfObjects())) {
_n++; //move on to the next neighbor
_k = 0; //reset k to zero
//if n exceeds the number of neighboring cells
if(!(_n < _cell[_c].getNumberOfNeighbors())) {
_i++; //move on to the next object
//if the next object does not exist
if(!(_i < (int)_tag.size())) {
_end = true;
return _current_pair;
}
//otherwise move on to the next cell
_current_pair.first = _tag[_i];
_same_cell = true;
_c = _cell_containing[_current_pair.first];
}
nextPair();
return _current_pair;
}
else {
//get the next object in the cell
_current_pair.second =
_cell[_cell[_c].getNeighbors()[_n]].getContents()[_k++];
return _current_pair;
}
}
}
// vanilla 8 direction search
int aStarSearch::eightDirectionSearch(const int a_startX, const int a_startY, const int a_targetX, const int a_targetY, const int a_mapWidth, const int a_mapHeight, map& a_map, int* a_outBuffer, const int a_outBufferSize)
{
// create open set, priority queue returns the greater of the two compared elements, so tell it to use > instead of < to compare
// the pair to be put in queue is the (f cost, position)
std::priority_queue<std::pair<double,int>, std::vector<std::pair<double,int> >, std::greater<std::pair<double,int> > > openSet;
std::unordered_map<int,int> cameFrom;
std::unordered_map<int,double> costSoFar;
// keep track of who is visited, the bool is sort of pointless..
std::unordered_map<int,bool> visited;
// get heuristic
octileHeuristic heuristic;
int startPosition = a_startX + a_startY * a_mapWidth;
int finalPosition = a_targetX + a_targetY * a_mapWidth;
// start with initial condition and put it in queue
std::pair<double,int> startPair(0,startPosition);
cameFrom[startPosition] = startPosition;
openSet.push(startPair);
// one step in order: N S E W NE NW SE SW
const int* oneStepMove = a_map.getOneStepMove();
while (!openSet.empty())
{
// get best position so far
int currentPosition = openSet.top().second;
openSet.pop();
// never visited
if (!visited.count(currentPosition))
{
// put it in visited
visited[currentPosition] = true;
if (currentPosition == finalPosition)
{
return reconstructPath(startPosition, currentPosition, a_map, cameFrom, a_outBuffer, a_outBufferSize);
}
// consider the 8 possible moves
double cost;
for (int successor = 0; successor < 8; successor++)
{
int nextPos = currentPosition + oneStepMove[successor];
// check if move is possible
if (a_map[nextPos])
{
// for visualization purposes
a_map[nextPos] = 2;
// straight moves cost 1, diagonal moves cost sqrt(2)
if (successor < 4)
{
cost = costSoFar[currentPosition] + 1;
}
else
{
cost = costSoFar[currentPosition] + sqrt(2);
}
// if the neighbor is not in open set or cost from this node is better
if (!costSoFar.count(nextPos) || cost < costSoFar[nextPos])
{
costSoFar[nextPos] = cost;
double priority = cost + heuristic.estimateCost(nextPos, a_targetX, a_targetY, a_mapWidth);
std::pair<double,int> nextPair(priority,nextPos);
openSet.push(nextPair);
cameFrom[nextPos] = currentPosition;
}
}
}
}
}
// couldn't find a solution
return -1;
}
// vanilla jps
int aStarSearch::jumpPointSearch(const int a_startX, const int a_startY, const int a_targetX, const int a_targetY, const int a_mapWidth, const int a_mapHeight, map& a_map, int* a_outBuffer, const int a_outBufferSize)
{
// compute start and final positions
int startPosition = a_startX + a_startY * a_mapWidth;
int finalPosition = a_targetX + a_targetY * a_mapWidth;
// create open set, priority queue returns the greater of the two compared elements, so tell it to use > instead of < to compare
// the pair to be put in queue is the (f cost, position)
std::priority_queue<std::pair<double,int>, std::vector<std::pair<double,int> >, std::greater<std::pair<double,int> > > openSet;
std::unordered_map<int,int> cameFrom;
std::unordered_map<int,double> costSoFar;
// keep track of who is visited, the bool is sort of pointless..
std::unordered_map<int,bool> visited;
// get heuristic
octileHeuristic heuristic;
double priority, cost;
// get jump point finder
jumpPointTools jpTools;
/*
// get dead end detector and detect deadend
deadendDetector deDetector;
std::vector<int> relevantZones(a_map.getNumZones()+1,0);
deDetector.deadendSearch(a_map.getZone(startPosition), a_map.getZone(finalPosition), a_map.getZoneConnections(), relevantZones);
*/
cameFrom[startPosition] = startPosition;
// one step in order: N S E W NE NW SE SW
const int* oneStepMove = a_map.getOneStepMove();
Direction directions [] = { Direction::N,
Direction::S,
Direction::E,
Direction::W,
Direction::NE,
Direction::NW,
Direction::SE,
Direction::SW};
// start problem off by moving one step in every direction from starting position
visited[startPosition] = true;
for (int successor = 0; successor < 8; successor++)
{
int nextPos = startPosition + oneStepMove[successor];
// check if move is possible
if (a_map[nextPos])
{
// for visualization purposes
a_map[nextPos] = 2;
// straight moves cost 1, diagonal moves cost sqrt(2)
if (successor < 4)
{
cost = costSoFar[startPosition] + 1;
}
else
{
cost = costSoFar[startPosition] + sqrt(2);
}
costSoFar[nextPos] = cost;
priority = cost + heuristic.estimateCost(nextPos, a_targetX, a_targetY, a_mapWidth);
std::pair<double,int> nextPair(priority,nextPos);
openSet.push(nextPair);
cameFrom[nextPos] = startPosition;
}
}
// look at open set
while (!openSet.empty())
{
// get best position so far
int currentPosition = openSet.top().second;
openSet.pop();
// haven't visited this node yet
if (!visited.count(currentPosition))
{
visited[currentPosition] = true;
// check end condition
if (currentPosition == finalPosition)
{
return reconstructPath(startPosition, currentPosition, a_map, cameFrom, a_outBuffer, a_outBufferSize);
}
// find out how parent got here, currentPosition = parent + parentDirection
Direction parentDirection = jpTools.findParentDirection(currentPosition, cameFrom[currentPosition], oneStepMove, directions);
// find successors!
std::vector<std::pair<int, Direction> > successors;
jpTools.findJumpPoints(currentPosition, a_map, parentDirection, finalPosition, oneStepMove, successors);
for (int j = 0; j < successors.size(); j++)
{
// what is successor and what direction to get there
int nextPos = successors[j].first;
Direction nextDir = successors[j].second;
// check if move is possible
if (a_map[nextPos])
{
// for visualization purposes
a_map[nextPos] = 2;
// find out how many jumps it took to get here
int numOfJumps = 0;
int temp = currentPosition;
while (temp != nextPos)
{
numOfJumps++;
temp += oneStepMove[nextDir];
}
// straight moves cost 1, diagonal moves cost sqrt(2)
if (nextDir < 4)
{
cost = costSoFar[currentPosition] + numOfJumps;
}
else
{
cost = costSoFar[currentPosition] + numOfJumps*sqrt(2);
}
// if the neighbor is not in open set or cost from this node is better
if (!costSoFar.count(nextPos) || cost < costSoFar[nextPos])
{
priority = cost + heuristic.estimateCost(nextPos, a_targetX, a_targetY, a_mapWidth);
std::pair<double,int> nextPair(priority,nextPos);
openSet.push(nextPair);
// update entire path to the jump point for cost and came from
for (int j = 1; j <= numOfJumps; j++)
{
int updatePos = currentPosition + j*oneStepMove[nextDir];
a_map[updatePos] = 2;
if (nextDir < 4)
{
costSoFar[updatePos] = costSoFar[currentPosition] + j;
}
else
{
costSoFar[updatePos] = costSoFar[currentPosition] + j * sqrt(2);
}
cameFrom[updatePos] = updatePos - oneStepMove[nextDir];
}
}
}
}
}
}
// couldn't find a solution
return -1;
}
