public static Direction ToDirection(this ThreatDirection threatDirection)
{
switch (threatDirection)
{
case ThreatDirection.East:
return(Direction.East);
case ThreatDirection.North:
return(Direction.North);
case ThreatDirection.NorthEast:
return(Direction.NorthEast);
case ThreatDirection.NorthWest:
return(Direction.NorthWest);
case ThreatDirection.South:
return(Direction.South);
case ThreatDirection.SouthEast:
return(Direction.SouthEast);
case ThreatDirection.SouthWest:
return(Direction.SouthWest);
case ThreatDirection.West:
return(Direction.West);
default:
throw new InvalidOperationException();
}
}
public static bool HasThreats(this ThreatDirection?threatDirection, ThreatDirection threat)
{
if (threatDirection.HasValue)
{
return((threatDirection.Value & threat) > 0);
}
return(false);
}
public void AddPin(ThreatDirection newPin)
{
if (Pin.HasValue)
{
Pin |= newPin;
}
else
{
Pin = newPin;
}
}
public void Add(BoardLocation boardLocation, ThreatDirection threatDirection, ThreatDirection?pin)
{
var threat = new Threat();
threat.AddDirection(threatDirection);
if (pin.HasValue)
{
threat.AddPin(pin.Value);
}
Add(boardLocation, threat);
}
private void AddThreat(
ThreatMatrix threatMatrix,
BoardLocation playerKingLocation,
BoardLocation threateningPieceLocation,
BoardLocation boardLocationBeingThreatening,
ThreatDirection direction,
ThreatDirection?pin = null)
{
if (!threatMatrix.ContainsKey(boardLocationBeingThreatening))
{
threatMatrix.Add(boardLocationBeingThreatening, direction, pin);
}
else
{
//update the threat direction
threatMatrix[boardLocationBeingThreatening].AddDirection(direction);
//can only be pinned in one direction (since there is only one king)
if (pin != null)
{
threatMatrix[boardLocationBeingThreatening].AddPin(pin.Value);
}
}
//if this is a king threat
if (playerKingLocation == boardLocationBeingThreatening)
{
//we set the piece that is threatening the king here. Please note that it is possible more than one piece
//is threatening the king but it is IMPOSSIBLE for a triple check to occur.
var threat = threatMatrix[boardLocationBeingThreatening];
if (threat.FirstPieceThreateningKingBoardLocation.HasValue)
{
threat.SecondPieceThreateningKingBoardLocation = threateningPieceLocation;
}
else
{
threat.FirstPieceThreateningKingBoardLocation = threateningPieceLocation;
}
}
}
public void AddDirection(ThreatDirection newDirection)
{
ThreatDirection |= newDirection;
}
