public void Neighbor_TryGetNeighbor_Self()
{
FastIndex hex = Indexes.A1;
hex.TryGetNeighbor(HexNeighborDirection.Up, out hex);
Assert.AreEqual(Indexes.A2, hex);
}
static IEnumerable <FastIndex> GenerateAllPossibleKingMoves(FastIndex start)
{
foreach (var direction in AllDirections)
{
if (start.TryGetNeighbor(direction, out var neighbor))
{
yield return(neighbor);
}
}
}
public static void AddAllPossiblePawnMoves(List <FastMove> moves, FastIndex start, Team team, FastBoardNode boardNode, bool generateQuiet = true)
{
Team enemy = team.Enemy();
HexNeighborDirection leftAttackDir = HexNeighborDirection.UpLeft;
HexNeighborDirection leftPassantDir = HexNeighborDirection.DownLeft;
HexNeighborDirection rightAttackDir = HexNeighborDirection.UpRight;
HexNeighborDirection rightPassantDir = HexNeighborDirection.DownRight;
HexNeighborDirection forwardDir = HexNeighborDirection.Up;
if (team != Team.White)
{
leftAttackDir = HexNeighborDirection.DownLeft;
leftPassantDir = HexNeighborDirection.UpLeft;
rightAttackDir = HexNeighborDirection.DownRight;
rightPassantDir = HexNeighborDirection.UpRight;
forwardDir = HexNeighborDirection.Down;
}
if (start.TryGetNeighbor(leftAttackDir, out var leftAttack))
{
var leftVictim = boardNode[leftAttack];
if (leftVictim.team == enemy)
{
moves.Add(new FastMove(start, leftAttack, MoveType.Attack));
}
if (leftVictim.team == Team.None)
{
if (start.TryGetNeighbor(leftPassantDir, out var leftPassant) && boardNode.PassantableIndex == leftPassant)
{
moves.Add(new FastMove(start, leftAttack, MoveType.EnPassant));
}
}
}
if (start.TryGetNeighbor(rightAttackDir, out var rightAttack))
{
var rightVictim = boardNode[rightAttack];
if (rightVictim.team == enemy)
{
moves.Add(new FastMove(start, rightAttack, MoveType.Attack));
}
if (rightVictim.team == Team.None)
{
if (start.TryGetNeighbor(rightPassantDir, out var rightPassant) && boardNode.PassantableIndex == rightPassant)
{
moves.Add(new FastMove(start, rightAttack, MoveType.EnPassant));
}
}
}
if (!generateQuiet)
{
return;
}
// One forward
bool hasForward = start.TryGetNeighbor(forwardDir, out var forward);
if (hasForward && !boardNode.IsOccupied(forward))
{
if (forward.TryGetNeighbor(forwardDir, out var twoForward))
{
moves.Add(new FastMove(start, forward, MoveType.Move));
// Two forward on 1st move
if (PawnIsAtStart(team, (Index)start) && !boardNode.IsOccupied(twoForward))
{
moves.Add(new FastMove(start, twoForward, MoveType.Move));
}
}
else
{
// if two squares forward doesn't exist, that means we're on the last rank for this pawn.
moves.Add(new FastMove(start, forward, MoveType.Move, FastPiece.Queen));
moves.Add(new FastMove(start, forward, MoveType.Move, FastPiece.Rook));
moves.Add(new FastMove(start, forward, MoveType.Move, FastPiece.Knight));
moves.Add(new FastMove(start, forward, MoveType.Move, FastPiece.Squire));
}
}
}