/// <inheritdoc/>
public IEnumerable <Path> GetPaths(Point start, Piece piece, IPieceEnumerationProvider squares)
{
return(piece.Type == PieceType.Pawn
? new[]
{
piece.Edge.RotateCounterClockwise(3),
piece.Edge.Opposite(),
piece.Edge.RotateClockwise(3)
}
.Where(direction => squares.EnumerateStraightLine(start, direction).Any())
.Select(direction =>
{
var isMove = direction == piece.Edge.Opposite();
var moves = squares.EnumerateStraightLine(start, direction).Take(2).ToList();
return new Path
{
AllowMove = isMove,
AllowTake = !isMove,
Direction = direction,
Start = start,
Piece = piece,
OppositeEdge = !squares.EnumerateStraightLine(start, piece.Edge.Opposite()).Skip(1).Any(),
Squares = moves.Take(piece.HasMoved || !isMove ? 1 : 2)
};
})
: Enumerable.Empty <Path>());
}
/// <inheritdoc/>
public IEnumerable <Path> GetPaths(Point start, Piece piece, IPieceEnumerationProvider squares)
=> piece.Type == PieceType.Knight
? squares.EnumerateKnight(start).Select(sq => new Path
{
AllowMove = true,
AllowTake = true,
Start = start,
Piece = piece,
Direction = Direction.None,
Squares = new[] { sq }
})
: Enumerable.Empty <Path>();
/// <inheritdoc/>
public IEnumerable <Path> GetPaths(Point start, Piece piece, IPieceEnumerationProvider squares)
=> piece.Type == PieceType.Bishop || piece.Type == PieceType.Queen
? Directions.Diagonals
.Where(direction => squares.EnumerateStraightLine(start, direction).Any())
.Select(direction => new Path
{
AllowMove = true,
AllowTake = true,
Direction = direction,
Start = start,
Piece = piece,
Squares = squares.EnumerateStraightLine(start, direction)
})
: Enumerable.Empty <Path>();
