public override List <Position> GetPossiblePositions(IDirection direction)
{
var possibleOutcomes = new List <Position>();
possibleOutcomes.AddRange(direction.GetEastPositions(CurrentPosition, Constants.ChessBoardUpperLimit));
possibleOutcomes.AddRange(direction.GetWestPositions(CurrentPosition, Constants.ChessBoardUpperLimit));
possibleOutcomes.AddRange(direction.GetNorthPositions(CurrentPosition, Constants.ChessBoardUpperLimit));
possibleOutcomes.AddRange(direction.GetSouthPositions(CurrentPosition, Constants.ChessBoardUpperLimit));
return(possibleOutcomes);
}
/// <summary>
/// Pawn can move only forward by one cell.
/// White pawn can move forward from A to H as per chess boards location.
/// Black pawn can move from H to A as per chess boards default location.
/// </summary>
/// <param name="initialPosition"></param>
/// <returns></returns>
public override List <Position> GetPossiblePositions(IDirection direction)
{
if (Color == PieceColours.White)
{
return(direction.GetNorthPositions(CurrentPosition, 1));
}
else
{
return(direction.GetSouthPositions(CurrentPosition, 1));
}
}
/// <summary>
/// This gives possible movements of King.
/// King can move only 1 step at a time in all 8 directions (horizontal, vertical and diagonal)
/// </summary>
/// <param name="initialPosition"></param>
/// <returns></returns>
public override List <Position> GetPossiblePositions(IDirection direction)
{
var possibleOutcomes = new List <Position>();
possibleOutcomes.AddRange(direction.GetEastPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetWestPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetNorthPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetSouthPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetNorthEastPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetNorthWestPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetSouthEastPositions(CurrentPosition, 1));
possibleOutcomes.AddRange(direction.GetSouthWestPositions(CurrentPosition, 1));
return(possibleOutcomes);
}
/// <summary>
///To calculate the vertical movements of a horse, we need to go 2 cells east and west.
///For the valid horizontal 2 cell movements, we can then go vertical as a half movement.
/// </summary>
/// <param name="initialPosition"></param>
/// <returns></returns>
private List <Position> GetVerticalTwoAndHalfMovements(IDirection direction)
{
var horizontalPositions = new List <Position>();
var eastIndex = CurrentPosition.Column + 2;
if (eastIndex.IsValidMovement() == true)
{
horizontalPositions.Add(new Position(CurrentPosition.Row, eastIndex));
}
var westIndex = CurrentPosition.Column - 2;
if (westIndex.IsValidMovement() == true)
{
horizontalPositions.Add(new Position(CurrentPosition.Row, westIndex));
}
var verticalMovements = new List <Position>();
horizontalPositions.ForEach(x =>
{
verticalMovements.AddRange(direction.GetNorthPositions(x, 1));
verticalMovements.AddRange(direction.GetSouthPositions(x, 1));
});
return(verticalMovements);
}