// Remove all groups that are marked dead
public override void DeleteDead()
{
foreach (int groupId in _markedGroups)
{
AbGroup groupToDelete = _groups[groupId];
State opponentColor = groupToDelete.GetColor();
switch (opponentColor)
{
case State.Black:
Capture(groupToDelete, State.White);
break;
case State.White:
Capture(groupToDelete, State.Black);
break;
case State.None:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
_markedGroups.RemoveWhere(c => _markedGroups.Contains(c));
}
/**
* This method Updates the state of the board with the addition of the new stone
*/
private void UpdateBoard(Coord coord, State color, State opponent)
{
_gridStones[coord.Column, coord.Row] = color; //Place the stone
HashSet <Coord> neigh = GetNeighbours(coord); // Get the neighboouring coords.
var g = new Group(GetNextGroupId(), coord, color, GetColoredNeighbour(neigh, State.None),
GetColoredNeighbour(neigh, opponent)); //Create the group
_groups.Add(g.GetId(), g); // Add the group to the board
_gridGroups[coord.Column, coord.Row] = g.GetId(); //Add group to grid
foreach (Coord pos in neigh) //Merge adjacent groups of same color into this group.
{
int groupId = _gridGroups[pos.Column, pos.Row];
if (!_groups.ContainsKey(groupId) || groupId == g.GetId()) // If there is no group of the ID do nothing
{
continue;
}
AbGroup ng = _groups[_gridGroups[pos.Column, pos.Row]];
if (ng?.GetColor() == color) // If the group is of the same collor merge the groups
{
MergeGroupGrid(g, ng);
MergeGroup(g, ng);
g.AddStone(coord);
}
else if (ng?.GetColor() == opponent) // If the gorup is of the opponent
{
ng.AddStone(coord);
if (ng.GetLiberties().Count == 0) // If we removed the last liberty capture the group
{
Capture(ng, color);
}
}
}
// These methods prints the board and some debugg information in the output.
WriteGroupBoard();
WriteGroupLiberties();
}