Method rescaleValueAxis

src/qt/qcustomplot.cpp:11036–11067

! Rescales the value axis of the plottable so the whole plottable is visible. If \a inKeyRange is set to true, only the data points which are in the currently visible key axis range are considered. Returns true if the axis was actually scaled. This might not be the case if this plottable has an invalid range, e.g. because it has no data points. See \ref rescaleAxes for detailed behav

  See \ref rescaleAxes for detailed behaviour.
*/
void QCPAbstractPlottable::rescaleValueAxis(bool onlyEnlarge, bool inKeyRange) const
{
  QCPAxis *keyAxis = mKeyAxis.data();
  QCPAxis *valueAxis = mValueAxis.data();
  if (!keyAxis || !valueAxis) { qDebug() << Q_FUNC_INFO << "invalid key or value axis"; return; }
  
  QCP::SignDomain signDomain = QCP::sdBoth;
  if (valueAxis->scaleType() == QCPAxis::stLogarithmic)
    signDomain = (valueAxis->range().upper < 0 ? QCP::sdNegative : QCP::sdPositive);
  
  bool foundRange;
  QCPRange newRange = getValueRange(foundRange, signDomain, inKeyRange ? keyAxis->range() : QCPRange());
  if (foundRange)
  {
    if (onlyEnlarge)
      newRange.expand(valueAxis->range());
    if (!QCPRange::validRange(newRange)) // likely due to range being zero (plottable has only constant data in this axis dimension), shift current range to at least center the plottable
    {
      double center = (newRange.lower+newRange.upper)*0.5; // upper and lower should be equal anyway, but just to make sure, incase validRange returned false for other reason
      if (valueAxis->scaleType() == QCPAxis::stLinear)
      {
        newRange.lower = center-valueAxis->range().size()/2.0;
        newRange.upper = center+valueAxis->range().size()/2.0;
      } else // scaleType() == stLogarithmic
      {
        newRange.lower = center/qSqrt(valueAxis->range().upper/valueAxis->range().lower);
        newRange.upper = center*qSqrt(valueAxis->range().upper/valueAxis->range().lower);
      }
    }
    valueAxis->setRange(newRange);
  }
}

/*! \overload