private static HashSet <int> GetIndicesForDirectionalFileStepping(
Square square,
BoardData board,
DataMoveRuleDirectional rule)
{
HashSet <int> indices = new HashSet <int>();
// North and south
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 1));
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 5));
return(indices);
}
private static HashSet <int> GetIndicesForDirectionalRankStepping(
Square square,
BoardData board,
DataMoveRuleDirectional rule)
{
HashSet <int> indices = new HashSet <int>();
// East and West
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 3));
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 7));
return(indices);
}
private static HashSet <int> GetIndicesForDirectionalDiagonalStepping(
Square square,
BoardData board,
DataMoveRuleDirectional rule)
{
HashSet <int> indices = new HashSet <int>();
// Diagonals
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 0));
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 2));
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 4));
indices.UnionWith(GetNeighborSquareChain(square, board, rule.MaxDistance, 6));
return(indices);
}
private static HashSet <int> GetIndicesForDirectionalStepping(
Square square,
BoardData board,
DataMoveRuleDirectional rule)
{
HashSet <int> indices = new HashSet <int>();
switch (rule.Direction)
{
case MoveDirectionType.File:
indices = GetIndicesForDirectionalFileStepping(square, board, rule);
break;
case MoveDirectionType.Rank:
indices = GetIndicesForDirectionalRankStepping(square, board, rule);
break;
case MoveDirectionType.Diagonal:
indices = GetIndicesForDirectionalDiagonalStepping(square, board, rule);
break;
}
return(indices);
}
