public List <Field> GetAccessibleFields(BoardController bc)
{
var fields = new List <Field>();
switch (Piece.FenChar)
{
case 'k':
case 'K':
fields.AddRange(MoveHelper.GetAccessibleFieldsKing(bc, Piece));
break;
case 'q':
case 'Q':
fields.AddRange(MoveHelper.GetAccessibleFieldsBishop(bc, Piece));
fields.AddRange(MoveHelper.GetAccessibleFieldsRook(bc, Piece));
break;
case 'r':
case 'R':
fields.AddRange(MoveHelper.GetAccessibleFieldsRook(bc, Piece));
break;
case 'b':
case 'B':
fields.AddRange(MoveHelper.GetAccessibleFieldsBishop(bc, Piece));
break;
case 'n':
case 'N':
fields.AddRange(MoveHelper.GetAccessibleFieldsKnight(bc, Piece));
break;
case 'p':
case 'P':
var dY = Piece.PlayerAffiliation == PlayerAffiliation.White ? 1 : -1;
fields.AddRange(MoveHelper.GetAccessibleFieldsPawn(bc, Piece, dY));
break;
}
return(fields);
}
public static List <Field> GetAccessibleFieldsKnight(BoardController boardController, Piece piece)
{
var list = new List <Field>();
var field = piece.Field;
var affiliation = piece.PlayerAffiliation;
var board = boardController.Board;
var fields = board.Fields;
var x = field.X;
var y = field.Y;
var dX = new[] { 1, 2, 2, 1, -1, -2, -2, -1 };
var dY = new[] { -2, -1, 1, 2, 2, 1, -1, -2 };
for (var i = 0; i < 8; i++)
{
var nX = x + dX[i];
var nY = y + dY[i];
if (nX < 0 || nY < 0 || nX >= board.Width || nY >= board.Height)
{
continue;
}
var nField = fields[nX, nY];
var nPiece = nField.Piece;
if (nPiece == null || nPiece.PlayerAffiliation != affiliation)
{
list.Add(nField);
}
}
return(list);
}
public static List <Field> GetAccessibleFieldsRook(BoardController boardController, Piece piece)
{
var list = new List <Field>();
var field = piece.Field;
var affiliation = piece.PlayerAffiliation;
var board = boardController.Board;
var fields = board.Fields;
var x = field.X;
var y = field.Y;
for (var i = x + 1; i < board.Width; i++)
{
var nField = fields[i, y];
var nPiece = nField.Piece;
if (nPiece == null)
{
list.Add(nField);
continue;
}
if (nPiece.PlayerAffiliation != affiliation)
{
list.Add(nField);
}
break;
}
for (var i = x - 1; i >= 0; i--)
{
var nField = fields[i, y];
var nPiece = nField.Piece;
if (nPiece == null)
{
list.Add(nField);
continue;
}
if (nPiece.PlayerAffiliation != affiliation)
{
list.Add(nField);
}
break;
}
for (var i = y + 1; i < board.Height; i++)
{
var nField = fields[x, i];
var nPiece = nField.Piece;
if (nPiece == null)
{
list.Add(nField);
continue;
}
if (nPiece.PlayerAffiliation != affiliation)
{
list.Add(nField);
}
break;
}
for (var i = y - 1; i >= 0; i--)
{
var nField = fields[x, i];
var nPiece = nField.Piece;
if (nPiece == null)
{
list.Add(nField);
continue;
}
if (nPiece.PlayerAffiliation != affiliation)
{
list.Add(nField);
}
break;
}
return(list);
}
public static List <Field> GetAccessibleFieldsKing(BoardController boardController, Piece piece)
{
var list = new List <Field>();
var player = piece.Player;
var field = piece.Field;
var affiliation = piece.PlayerAffiliation;
var board = boardController.Board;
var fields = board.Fields;
var x = field.X;
var y = field.Y;
var dX = new[] { 0, -1, -1, -1, 0, 1, 1, 1 };
var dY = new[] { 1, 1, 0, -1, -1, -1, 0, 1 };
var attackedFields = BoardController.GetAttackedFields(player, true);
for (var i = 0; i < 8; i++)
{
var nX = x + dX[i];
var nY = y + dY[i];
if (nX < 0 || nY < 0 || nX >= board.Width || nY >= board.Height)
{
continue;
}
var nField = fields[nX, nY];
var nPiece = nField.Piece;
if (nPiece == null || nPiece.PlayerAffiliation != affiliation)
{
if (attackedFields.Contains(nField))
{
continue;
}
list.Add(nField);
}
}
if (player.MayCastleLong)
{
var field1 = field;
var field2 = fields[x - 1, y];
var field3 = fields[x - 2, y];
if (!(attackedFields.Contains(field1) ||
attackedFields.Contains(field2) ||
attackedFields.Contains(field3)))
{
if (field2.Piece == null && field3.Piece == null)
{
list.Add(field3);
}
}
}
if (player.MayCastleShort)
{
var field1 = field;
var field2 = fields[x + 1, y];
var field3 = fields[x + 2, y];
if (!(attackedFields.Contains(field1) ||
attackedFields.Contains(field2) ||
attackedFields.Contains(field3)))
{
if (field2.Piece == null && field3.Piece == null)
{
list.Add(field3);
}
}
}
return(list);
}