private void DisplayNextPiece(TetrisPiece oldPiece, TetrisPiece newPiece)
{
DisplayNextPieceText();
bool arePiecesDifferent =
(oldPiece == null && newPiece != null) ||
(oldPiece != null && newPiece == null) ||
(oldPiece != null && newPiece != null && !oldPiece.Equals(newPiece));
if (arePiecesDifferent && oldPiece != null)
{
DeleteNextPiece(oldPiece);
}
if (arePiecesDifferent && newPiece != null)
{
Coordinates coord = new Coordinates(NextPieceLine, NextPieceText.Length);
PieceRender.Display(newPiece, coord);
}
}