for (int i = 0; i < 64; i++) {
  int cellX = i % 8;
  int cellY = i / 8;
  if (squareTypes[i] == 0)
    g.drawImage(boardSquare, cellX * 32, cellY * 32, this);
  if (squareTypes[i] == 1)
    g.drawImage(whitePiece,  cellX * 32, cellY * 32, this);
  if (squareTypes[i] == 2)
    g.drawImage(blackPiece,  cellX * 32, cellY * 32, this);
}