/// <summary>
/// Starts a new game of Tetris
/// </summary>
public void StartGame()
{
FixedPieces.Clear();
MovingPiece = TetrisPiece.GetRandomPiece();
FuturePiece = TetrisPiece.GetRandomPiece();
Score = 0;
Timer.Start();
}
/// <summary>
/// Moves on to the next piece
/// </summary>
private void NextPiece()
{
PrevPosition.Clear();
FixedPieces.Add(MovingPiece);
MovingPiece = FuturePiece;
FuturePiece = TetrisPiece.GetRandomPiece();
CheckFilledRows();
}
/// <summary>
/// Shifts the moving piece 1 square right, if possible
/// </summary>
private void MovePieceRight()
{
List <Square> squares = MovingPiece.OccupiedSquares;
// Can't move out of bounds
if (squares.Any(ms => ms.X == Width - 1))
{
return;
}
// Can't move into an already occupied square
else if (FixedPieces.Any(fp => fp.OccupiedSquares.Any(fs => squares.Any(ms => ms.X + 1 == fs.X && ms.Y == fs.Y))))
{
return;
}
MovingPiece.MoveRight();
}
/// <summary>
/// Finds all rows that are completely filled and removes them
/// </summary>
private void CheckFilledRows()
{
for (int y = 0; y < Height; y++)
{
int filled = FixedPieces.Sum(fp => fp.OccupiedSquares.Where(fs => fs.Y == y).Count());
if (filled == Width)
{
// Clear row
foreach (TetrisPiece piece in FixedPieces)
{
piece.EraseRow(y);
}
ErasedRows.Add(y);
Score++;
}
}
}
/// <summary>
/// Rotates the moving piece
/// </summary>
private void RotatePiece()
{
List <Square> afterRotation = MovingPiece.SimulateRotation();
// Can't move out of bounds
if (afterRotation.Any(ms => ms.X < 0) || afterRotation.Any(ms => ms.X >= Width) ||
afterRotation.Any(ms => ms.Y < 0) || afterRotation.Any(ms => ms.Y >= Height))
{
return;
}
// Can't move into an already occupied square
if (FixedPieces.Any(fp => fp.OccupiedSquares.Any(fs => afterRotation.Any(rs => rs.X == fs.X && rs.Y == fs.Y))))
{
return;
}
MovingPiece.Rotate();
}