public void CanSelectLocation_WithoutCurrentSelection_WrongPieceColour()
{
var location = new BoardLocation(ChessColour.Black, new Pawn(ChessColour.Black));
Assert.IsFalse(CanSelect(location));
model.CurrentPlayerColour = ChessColour.Black;
location.Piece = new Pawn(ChessColour.White);
Assert.IsFalse(CanSelect(location));
}
public void CanSelectLocation_WithCurrentSelection_WithPiece_WrongColour()
{
var location = new BoardLocation(ChessColour.Black, new Pawn(ChessColour.Black)) { IsTargeted = false };
model.SelectedBoardLocation = new BoardLocation(ChessColour.Black);
Assert.IsFalse(CanSelect(location));
location.IsTargeted = true;
Assert.IsTrue(CanSelect(location));
}
public void CanSelectLocation_WithoutCurrentSelection_NoPiece()
{
var location = new BoardLocation(ChessColour.Black);
Assert.IsFalse(CanSelect(location));
}
private void Select(BoardLocation location)
{
model.ExecuteCommand(ChessboardViewModel.SelectLocationCommand, location, out handled);
}
public void CanSelectLocation_WithCurrentSelection_WithPiece_RightColour()
{
var location = new BoardLocation(ChessColour.Black, new Pawn(ChessColour.White));
model.SelectedBoardLocation = new BoardLocation(ChessColour.White);
Assert.IsTrue(CanSelect(location));
}
private void MakeMove(BoardLocation from, int fromIndex, BoardLocation to, int toIndex)
{
if (fromIndex < 0 || fromIndex >= Chessboard.NumLocations)
{
throw new ArgumentOutOfRangeException("fromIndex");
}
if (toIndex < 0 || toIndex >= Chessboard.NumLocations)
{
throw new ArgumentOutOfRangeException("toIndex");
}
var oldBlackLocations = this.BlackLocations;
var oldWhiteLocations = this.WhiteLocations;
if (from.PieceColour == ChessColour.Black)
{
oldBlackLocations[fromIndex] = false;
oldBlackLocations[toIndex] = true;
// if a piece of the other player is being taken
if (to.HasPiece)
{
oldWhiteLocations[toIndex] = false;
}
}
else
{
oldWhiteLocations[fromIndex] = false;
oldWhiteLocations[toIndex] = true;
if (to.HasPiece)
{
oldBlackLocations[toIndex] = false;
}
}
BlackLocations = oldBlackLocations;
WhiteLocations = oldWhiteLocations;
to.Piece = from.Piece;
from.Piece = null;
}
private bool CanSelect(BoardLocation location)
{
return model.CanExecuteCommand(ChessboardViewModel.SelectLocationCommand, location, out handled);
}
public void MakeMove(BoardLocation from, BoardLocation to)
{
if (from == null)
{
throw new ArgumentNullException("from");
}
if (to == null)
{
throw new ArgumentNullException("to");
}
this.MakeMove(from, Locations.IndexOf(from), to, Locations.IndexOf(to));
}
public BitArray GetRay(BoardLocation location)
{
if (location == null)
{
throw new ArgumentNullException("location");
}
var piece = location.Piece;
if (piece == null)
{
throw new ArgumentException("Expected location to have a piece but it doesn't");
}
var index = this.Locations.IndexOf(location);
var ray = piece.GetCorrectedRay(index, this.WhiteLocations, this.BlackLocations);
return this.GetCheckPreventionRay(ray, index, piece.Colour);
}
private void TargetLocations(BoardLocation location)
{
if (location == null)
{
return;
}
ChessPiece piece = location.Piece;
var ray = board.GetRay(location);
for (int i = 0; i < ray.Count; i++)
{
if (ray[i])
{
this.Locations[i].IsTargeted = true;
}
}
}
private void SelectLocation(BoardLocation location)
{
UntargetAllLocations();
if (this.SelectedBoardLocation == null)
{
//nothing is currently selected
this.SelectedBoardLocation = location;
}
else
{
if (location == this.SelectedBoardLocation)
{
//deselect the current selection
this.SelectedBoardLocation = null;
}
else if (location.HasPiece && !location.IsTargeted && location.PieceColour == this.CurrentPlayerColour)
{
// select another location of the player
this.SelectedBoardLocation.IsSelected = false;
this.SelectedBoardLocation = location;
}
else
{
// move piece. Can only be moved to a location that is targeted.
board.MakeMove(this.SelectedBoardLocation, location);
this.ToggleCurrentPlayerColour();
this.SelectedBoardLocation.IsSelected = false;
location.IsSelected = false;
this.SelectedBoardLocation = null;
}
}
TargetLocations(this.SelectedBoardLocation);
DetectCheck();
DetectCheckmate();
DetectStalemate();
if(CurrentPlayerColour == ChessColour.Black)
{
var move = engine.FindBestAlphaBetaMove(board, CurrentPlayerColour);
board.MakeMove(move.FromIndex, move.ToIndex);
this.ToggleCurrentPlayerColour();
DetectCheck();
DetectCheckmate();
DetectStalemate();
this.BranchCount = engine.recursiveCount;
}
}
private bool CanSelectLocation(BoardLocation location)
{
//any piece of the current player can be selected
if (location.HasPiece && location.PieceColour == this.CurrentPlayerColour)
{
return true;
}
//if a piece is already selected, then any location without a piece can be selected
else if (this.SelectedBoardLocation != null && location.IsTargeted)
{
return true;
}
else
{
return false;
}
}