AnalysisDataPointSetRef::AnalysisDataPointSetRef(
const AnalysisDataPointSetRef &points, int firstColumn, int columnCount)
: header_(points.header()), dataSetIndex_(points.dataSetIndex()),
firstColumn_(0)
{
GMX_ASSERT(firstColumn >= 0, "Invalid first column");
GMX_ASSERT(columnCount >= 0, "Invalid column count");
if (points.lastColumn() < firstColumn
|| points.firstColumn() >= firstColumn + columnCount
|| columnCount == 0)
{
return;
}
AnalysisDataValuesRef::const_iterator begin = points.values().begin();
int pointsOffset = firstColumn - points.firstColumn();
if (pointsOffset > 0)
{
// Offset pointer if the first column is not the first in points.
begin += pointsOffset;
}
else
{
// Take into account if first column is before the first in points.
firstColumn_ = -pointsOffset;
columnCount -= -pointsOffset;
}
// Decrease column count if there are not enough columns in points.
AnalysisDataValuesRef::const_iterator end = begin + columnCount;
if (pointsOffset + columnCount > points.columnCount())
{
end = points.values().end();
}
values_ = AnalysisDataValuesRef(begin, end);
}
