private IEnumerator MoveTetromino()
{
bool isTetrominoLocked = false;
bool activateDropHard = false;
bool useHoldPiece = false;
while (!isTetrominoLocked && !useHoldPiece) // while current tetromino is not locked or while player has not activated hold piece
{
// if drop hard was activated, we skip tetromino control
if (!activateDropHard)
{
// Control tetromino
yield return(StartCoroutine(ControlTetromino()));
}
// Check if player has clicked the drop hard button while controlling the tetromino
if (_inputController.DropHard)
{
activateDropHard = true;
}
ClearTetromino(_ghostTetromino);
ClearTetromino(_currentTetromino);
if (_inputController.HoldPiece && !_isHoldPiece)
{
useHoldPiece = true;
}
else
{
// Apply gravity
_currentTetromino.CurrentLine += 1;
if (!CanPlaceTetromino(_currentTetromino))
{
// rollback and lock the tetromino
_currentTetromino.CurrentLine -= 1;
isTetrominoLocked = true;
}
UpdateGhostTetromino(_currentTetromino, _ghostTetromino);
DrawGhostTetromino(_ghostTetromino);
DrawTetromino(_currentTetromino);
}
}
if (!useHoldPiece)
{
List <int> clearedLines = GetClearedLines();
if (clearedLines.Count > 0)
{
yield return(StartCoroutine(AnimateClearedLines(clearedLines)));
RemoveClearedLines(clearedLines);
_levelController.AddClearedLines(clearedLines.Count);
}
else
{
_soundController.PlayPlaceTetromino();
// Add a frame to refresh input
yield return(null);
}
if (IsPlayerInDanger())
{
_soundController.SetFastBgMusicPitch();
}
else
{
_soundController.SetDefaultBgMusicPitch();
}
}
yield return(StartCoroutine(SpawnTetromino(useHoldPiece)));
}