/// <summary>
/// Checks to see if the Pawn can move to the specified location
/// </summary>
/// <param name="square">The Square the Pawn is moving to</param>
/// <returns>True if the move is valid</returns>
public override bool CanMoveTo(Square square)
{
if (square.ColumnLabel == Space.ColumnLabel) //Normal movement
{
int distance = square.RowNumber - Space.RowNumber;
if (distance == 1)
{
return(true);
}
else if (distance == -1 && !white)
{
return(true);
}
else if (distance == 2 && white && !hasMoved)
{
return(true);
}
else if (distance == -2 && !white && !hasMoved)
{
return(true);
}
}
else if (square.Piece != null && IsDiagonalTo(square)) //Taking Pieces
{
if (IsWhite)
{
if (square.Equals(Space.TopLeftOf()))
{
return(true);
}
else if (square.Equals(Space.TopRightOf()))
{
return(true);
}
}
else
{
if (square.Equals(Space.BottomLeftOf()))
{
return(true);
}
else if (square.Equals(Space.BottomRightOf()))
{
return(true);
}
}
}
//En Passant
else if ((Space.RightOf().Piece is Pawn || Space.LeftOf().Piece is Pawn) &&
((Space.RightOf().Piece != null && Space.RightOf().Piece.IsWhite != IsWhite) || (Space.LeftOf().Piece != null && Space.LeftOf().Piece.IsWhite != IsWhite)))
{
if (Program.lastMoved.Space.Equals(Space.RightOf()) || Program.lastMoved.Space.Equals(Space.LeftOf()))
{
if (Math.Abs(Program.lastEndSpace.RowNumber - Program.lastStartSpace.RowNumber) == 2)
{
if (square.Piece == null && IsDiagonalTo(square))
{
if (IsWhite)
{
if (square.RowNumber > Space.RowNumber)
{
return(true);
}
}
else
{
if (square.RowNumber < Space.RowNumber)
{
return(true);
}
}
}
}
}
}
return(false);
}
/// <summary>
/// Checks if there are pieces in the way before moving
/// </summary>
/// <param name="square">The Square that the Piece is moving to</param>
/// <returns>True if there are no other pieces in the way</returns>
public bool PathIsClear(Square square)
{
if (this is Knight)
{
return(true);
}
Square current = Space;
int xDir = Board.colLabels.IndexOf(square.ColumnLabel) - Board.colLabels.IndexOf(current.ColumnLabel);
int yDir = square.RowNumber - current.RowNumber;
while (!current.Equals(square))
{
if (xDir != 0 && yDir == 0) //Moving on just x axis
{
if (xDir > 0) // moving right
{
current = current.RightOf();
}
else //moving left
{
current = current.LeftOf();
}
}
else if (xDir == 0 && yDir != 0) //Moving on just y axis
{
if (yDir > 0) //moving up
{
current = current.TopOf();
}
else //moving down
{
current = current.BottomOf();
}
}
else //Diagonal
{
if (yDir > 0) //moving up
{
if (xDir > 0) //moving right
{
current = current.TopRightOf();
}
else //moving left
{
current = current.TopLeftOf();
}
}
else //moving down
{
if (xDir > 0) //moving right
{
current = current.BottomRightOf();
}
else //moving left
{
current = current.BottomLeftOf();
}
}
}
if (!current.Equals(square) && current.Piece != null)
{
return(false);
}
}
return(true);
}