public ChessPiece this[BoardLocation boardLocation]
{
get
{
return(_board[boardLocation.ToByte()]);
}
set
{
_board[boardLocation.ToByte()] = value;
}
}
public static bool IsPawnStartingLocation(this BoardLocation boardLocation, Player player)
{
if (player == Player.White)
{
return(boardLocation.ToByte() % 8 == 1);
}
else
{
return(boardLocation.ToByte() % 8 == 6);
}
}
public static BoardLocation?South(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 1;
//if we hop columns we are out of bounds
if (val / 8 != currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?North(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() + 1;
//if we hop columns we are out of bounds
if (val / 8 != currentLocation.Column())
{
return(null);
}
return((val < Constants.BoardSize) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?SouthEast(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() + 7;
//if we are not the next column this is invalid
if ((val / 8) == currentLocation.Column())
{
return(null);
}
return((val < Constants.BoardSize) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?SouthWest(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 9;
//if we are not the next column this is invalid
if ((val / 8) + 1 != currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?NorthWest(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 7;
//if we DONT hop columns we are out of bounds
if (val / 8 == currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static bool IsNorthWestFrom(this BoardLocation source, BoardLocation target)
{
//PGN format for the board
// A B C D E F G H
//8:| 7|15|23|31|39|47|55|63|
//7:| 6|14|22|30|38|46|54|62|
//6:| 5|13|21|29|37|45|53|61|
//5:| 4|12|20|28|36|44|52|60|
//4:| 3|11|19|27|35|43|51|59|
//3:| 2|10|18|26|34|42|50|58|
//2:| 1| 9|17|25|33|41|49|57|
//1:| 0| 8|16|24|32|40|48|56|
return((source.ToByte() < target.ToByte()) &&
source.IsOnSameSlopeAs(target));
}
public static bool IsSouthEastFrom(this BoardLocation source, BoardLocation target)
{
return((source.ToByte() > target.ToByte()) &&
source.IsOnSameSlopeAs(target));
}
public static bool IsSouthWestFrom(this BoardLocation source, BoardLocation target)
{
return((source.ToByte() < target.ToByte()) &&
source.IsOnSameGradeAs(target));
}
public static bool IsNorthFrom(this BoardLocation source, BoardLocation target)
{
return((source.ToByte() > target.ToByte()) &&
source.IsOnSameColumnAs(target));
}
public static BoardLocationColor Color(this BoardLocation boardLocation)
{
return(((boardLocation.ToByte() + boardLocation.Column() % 2) % 2 == 0) ? BoardLocationColor.Dark : BoardLocationColor.Light);
}
public static BoardLocation?West(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - Constants.BoardWidth;
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?East(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() + Constants.BoardWidth;
return((val < Constants.BoardSize) ? (BoardLocation)val : default(BoardLocation?));
}
private void AddKnightThreats(
Board board,
Player player,
BoardLocation playerKingLocation,
BoardLocation opposingPieceBoardLocation,
ThreatMatrix threatMatrix)
{
//PGN format for the board
// A B C D E F G H
//8:| 7|15|23|31|39|47|55|63|
//7:| 6| |22| |38|46|54|62|
//6:| |13|21|29| |45|53|61|
//5:| 4|12|20|28|36|44|52|60|
//4:| |11|19|27| |43|51|59|
//3:| 2| |18| |34|42|50|58|
//2:| 1| 9|17|25|33|41|49|57|
//1:| 0| 8|16|24|32|40|48|56|
//A knights move from postion 20.
//-17
//-15
//-10
//-6
//+17
//+15
//+10
//+6
List <BoardLocation> possibleMoves = new List <BoardLocation>();
var knightLocation = opposingPieceBoardLocation.ToByte();
//same column
var leftDown = knightLocation - 17;
var leftUp = knightLocation - 15;
//same row
var upLeft = knightLocation - 6;
var upRight = knightLocation + 10;
//same column
var rightUp = knightLocation + 17;
var rightDown = knightLocation + 15;
//same row
var downLeft = knightLocation - 10;
var downRight = knightLocation + 6;
if ((leftDown >= 0) &&
((knightLocation / 8) - (leftDown / 8) == 2))
{
possibleMoves.Add((BoardLocation)leftDown);
}
if ((leftUp >= 0) &&
((knightLocation / 8) - (leftUp / 8) == 2))
{
possibleMoves.Add((BoardLocation)leftUp);
}
if ((upLeft >= 0) &&
((knightLocation / 8) - (upLeft / 8) == 1))
{
possibleMoves.Add((BoardLocation)upLeft);
}
if ((downLeft >= 0) &&
((knightLocation / 8) - (downLeft / 8) == 1))
{
possibleMoves.Add((BoardLocation)downLeft);
}
if ((upRight < Constants.BoardSize) &&
((knightLocation / 8) - (upRight / 8) == -1))
{
possibleMoves.Add((BoardLocation)upRight);
}
if ((downRight < Constants.BoardSize) &&
((knightLocation / 8) - (downRight / 8) == -1))
{
possibleMoves.Add((BoardLocation)downRight);
}
if ((rightUp < Constants.BoardSize) &&
((knightLocation / 8) - (rightUp / 8) == -2))
{
possibleMoves.Add((BoardLocation)rightUp);
}
if ((rightDown < Constants.BoardSize) &&
((knightLocation / 8) - (rightDown / 8) == -2))
{
possibleMoves.Add((BoardLocation)rightDown);
}
possibleMoves
.ForEach(a => AddThreat(threatMatrix, playerKingLocation, opposingPieceBoardLocation, a, ThreatDirection.Direct));
}