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for (int row = 0; row < tableWidget->rowCount(); ++row) {
double x = tableWidget->item (row, 0)->text().toDouble();
double y = tableWidget->item (row, 1)->text().toDouble();
tableWidget->item (row, 0)->setText (QString::number (point.x()));
tableWidget->item (row, 1)->setText (QString::number (point.y()));
int rows = model()->rowCount (rootIndex());
int columns = model()->columnCount (rootIndex());