protected AreaPtgBase(AreaReference ar) {
CellReference firstCell = ar.getFirstCell();
CellReference lastCell = ar.getLastCell();
setFirstRow(firstCell.getRow());
setFirstColumn(firstCell.getCol() == -1 ? 0 : firstCell.getCol());
setLastRow(lastCell.getRow());
setLastColumn(lastCell.getCol() == -1 ? 0xFF : lastCell.getCol());
setFirstColRelative(!firstCell.isColAbsolute());
setLastColRelative(!lastCell.isColAbsolute());
setFirstRowRelative(!firstCell.isRowAbsolute());
setLastRowRelative(!lastCell.isRowAbsolute());
}
