public bool LayoutNextPiece(RotatedPiece rotatedPiece)
{
int firstEmptyX;
int firstEmptyY;
var foundAnEmptySquare = FindFirstEmptySquare(out firstEmptyX, out firstEmptyY);
if (!foundAnEmptySquare)
{
throw new InvalidOperationException("The puzzle is already solved!");
}
return(PlacePieceAt(rotatedPiece, firstEmptyX, firstEmptyY));
}
public bool PlacePieceAt(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);
}
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)
{
if (_pieces[x + pieceX, y + pieceY] != null)
{
return(false);
}
}
}
}
Coordinate firstSquare = null;
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)
{
if (firstSquare == null)
{
firstSquare = square;
}
_pieces[x + pieceX, y + pieceY] = new PieceHolder {
RotatedPiece = rotatedPiece, Square = square
};
}
}
}
return(true);
}