public void ApplyGravity()
{
CheckGameState();
var nextPiece = activePiece.MoveDown();
if (Field.CanPlace(nextPiece))
{
activePiece = nextPiece;
}
else if (!Field.Contains(activePiece))
{
// Note that this is not a Tetris Guideline compatible "lock out" condition.
// In our case, the game ends even if the piece is partially visible.
// See https://tetris.wiki/Top_out
IsOver = true;
}
else
{
Field.Place(activePiece);
var numClearedLines = Field.ClearLines();
if (numClearedLines > 0)
{
Stats.Clear(numClearedLines);
}
nextPiece = NewPiece();
if (Field.CanPlace(nextPiece))
{
activePiece = nextPiece;
}
else
{
// The "block out" condition.
IsOver = true;
}
}
}
