//method that moves a pawn and checks to make sure move is valid
public void MovePawn(ChessPawn pawn, int verticalMotion, int horizontalMotion)
{
if (pawn.Color.Equals("Black", StringComparison.OrdinalIgnoreCase))
{
verticalMotion = verticalMotion;
}
else
{
verticalMotion = -verticalMotion;
}
Console.WriteLine("Pawn entered");
if (!((ChessPawn)pawn).FirstMoveTaken)
{
if (verticalMotion > 2)
{
throw new System.InvalidOperationException("Pawns cannot move that far vertically, even on the first move.");
}
else if (verticalMotion < 0)
{
throw new System.InvalidOperationException("Pawns cannot move backwards.");
}
else if (horizontalMotion < -1 || horizontalMotion > 1)
{
throw new System.InvalidOperationException("Pawns can never move more than one space horizontally.")
}
else if (horizontalMotion != 0 && !Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied ||
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece != null &&
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece.Color.Equals(pawn.Color))
{
throw new System.InvalidOperationException("Pawns cannot move horizontally without attacking a piece of the opposite color.");
}
else
{
if (Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition +])
/// <summary>
/// Allows a pawn to move
/// </summary>
/// <param name="pawn">Requires an object of the pawn class</param>
/// <param name="verticalMotion">How far a pawn is being moved vertically</param>
/// <param name="horizontalMotion">How far a pawn is being moved horizontally</param>
public void MovePawn(ChessPawn pawn, int verticalMotion, int horizontalMotion)
{
//contains logic if a pawn is taking its first move
if (!((ChessPawn)pawn).FirstMoveTaken)
{
//ensures the pawn does not move more than 2 spaces forward
if (verticalMotion > 2)
{
throw new System.InvalidOperationException("Pawns cannot move that far vertically, even on the first move.");
}
//ensures the pawn does not move backwards
else if (verticalMotion < 0)
{
throw new System.InvalidOperationException("Pawns cannot move backwards.");
}
//makes the game more user friendly, and flips the sign of vertical motion if white pieces are used
if (pawn.Color.Equals("Black", StringComparison.OrdinalIgnoreCase))
{
verticalMotion = verticalMotion;
}
else
{
verticalMotion = -verticalMotion;
}
//ensures the user is not trying to move the pawn too far horizontally
if (horizontalMotion < -1 || horizontalMotion > 1)
{
throw new System.InvalidOperationException("Pawns can never move more than one space horizontally.");
}
//ensures that the user cannot move a pawn diagonally without attacking another piece
else if (horizontalMotion != 0 && !Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied ||
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece != null &&
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece.Color.Equals(pawn.Color))
{
throw new System.InvalidOperationException("Pawns cannot move horizontally without attacking a piece of the opposite color.");
}
//Logic for a successful move/attack
else
{
if (Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied && horizontalMotion == 1 ||
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied && horizontalMotion == -1)
{
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece.Defeat(
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece);
}
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece =
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece;
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece = null;
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].IsOccupied = false;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied = true;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece.HorizontalPosition = pawn.HorizontalPosition + horizontalMotion;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition].ChessPiece.VerticalPosition = pawn.VerticalPosition + verticalMotion;
}
}
///contains logic if a pawn is taking any move after its first
else
{
if (verticalMotion == 2)
{
throw new System.InvalidOperationException("Pawns can only move that far vertically on the first move.");
}
else if (verticalMotion > 1)
{
throw new System.InvalidOperationException("Pawns cannot move that far forward.");
}
if (pawn.Color.Equals("Black", StringComparison.OrdinalIgnoreCase))
{
verticalMotion = verticalMotion;
}
else
{
verticalMotion = -verticalMotion;
}
if (horizontalMotion < -1 || horizontalMotion > 1)
{
throw new System.InvalidOperationException("Pawns can never move more than one space horizontally.");
}
else
{
if (Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied && horizontalMotion == 1 ||
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied && horizontalMotion == -1)
{
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece.Defeat(
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece);
}
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece =
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece;
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].ChessPiece = null;
Chessboard[pawn.VerticalPosition, pawn.HorizontalPosition].IsOccupied = false;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].IsOccupied = true;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition + horizontalMotion].ChessPiece.HorizontalPosition = pawn.HorizontalPosition + horizontalMotion;
Chessboard[pawn.VerticalPosition + verticalMotion, pawn.HorizontalPosition].ChessPiece.VerticalPosition = pawn.VerticalPosition + verticalMotion;
}
}
}