private InternalRow BuildDataItem(int pieceIndex, RotatedPiece rotatedPiece, Coords coords)
{
var numColumns = _pieces.Length + _board.BoardSize * _board.BoardSize;
var matrixRow = new bool[numColumns];
matrixRow[pieceIndex] = true;
var w = rotatedPiece.Width;
var h = rotatedPiece.Height;
for (var pieceX = 0; pieceX < w; pieceX++)
{
for (var pieceY = 0; pieceY < h; pieceY++)
{
if (rotatedPiece.SquareAt(pieceX, pieceY) == null)
{
continue;
}
var boardX = coords.X + pieceX;
var boardY = coords.Y + pieceY;
var boardLocationColumnIndex = _pieces.Length + (_board.BoardSize * boardX) + boardY;
matrixRow[boardLocationColumnIndex] = true;
}
}
return(new InternalRow(matrixRow, new PiecePlacement(rotatedPiece, coords)));
}
private void AddDataItemsForPieceWithSpecificOrientation(int pieceIndex, Piece piece, Orientation orientation)
{
var rotatedPiece = new RotatedPiece(piece, orientation);
for (var x = 0; x < _board.BoardSize; x++)
{
for (var y = 0; y < _board.BoardSize; y++)
{
if (!_board.CanPlacePieceAt(rotatedPiece, x, y))
{
continue;
}
var dataItem = BuildDataItem(pieceIndex, rotatedPiece, new Coords(x, y));
_data.Add(dataItem);
}
}
}
public bool CanPlacePieceAt(RotatedPiece rotatedPiece, int x, int y)
{
if (x < 0 || x >= BoardSize)
{
throw new ArgumentOutOfRangeException("x");
}
if (y < 0 || y >= BoardSize)
{
throw new ArgumentOutOfRangeException("y");
}
if (x + rotatedPiece.Width > BoardSize)
{
return(false);
}
if (y + rotatedPiece.Height > BoardSize)
{
return(false);
}
// Check that each square of the piece to be placed has
// the appropriate colour for its intended board position.
for (var pieceX = 0; pieceX < rotatedPiece.Width; pieceX++)
{
for (var pieceY = 0; pieceY < rotatedPiece.Height; pieceY++)
{
var square = rotatedPiece.SquareAt(pieceX, pieceY);
if (square != null)
{
var boardX = x + pieceX;
var boardY = y + pieceY;
var expectedColour = ColourOfSquareZeroZero.RelativeColour(boardX, boardY);
if (square.Colour != expectedColour)
{
return(false);
}
}
}
}
return(true);
}