private Vector<Integer> getCompleteLineYIndices() {
		Vector<Integer> indexY = new Vector<Integer>();
		boolean completeLine = true;
		for (int y = boardSizeY; y >= 0; y--) {
			for (int x = 0; x <= boardSizeX - 1; x++) {
				if (tetrisMap[x][y] == 0) {
					completeLine = false;
				}
			}
			if (completeLine) {
				indexY.add(y);
			}
			completeLine = true;
		}

		return indexY;
	}