Method rescale

src/qt/qcustomplot.cpp:8506–8550

! Changes the axis range such that all plottables associated with this axis are fully visible in that dimension. \see QCPAbstractPlottable::rescaleAxes, QCustomPlot::rescaleAxes */

  \see QCPAbstractPlottable::rescaleAxes, QCustomPlot::rescaleAxes
*/
void QCPAxis::rescale(bool onlyVisiblePlottables)
{
  QList<QCPAbstractPlottable*> p = plottables();
  QCPRange newRange;
  bool haveRange = false;
  for (int i=0; i<p.size(); ++i)
  {
    if (!p.at(i)->realVisibility() && onlyVisiblePlottables)
      continue;
    QCPRange plottableRange;
    bool currentFoundRange;
    QCP::SignDomain signDomain = QCP::sdBoth;
    if (mScaleType == stLogarithmic)
      signDomain = (mRange.upper < 0 ? QCP::sdNegative : QCP::sdPositive);
    if (p.at(i)->keyAxis() == this)
      plottableRange = p.at(i)->getKeyRange(currentFoundRange, signDomain);
    else
      plottableRange = p.at(i)->getValueRange(currentFoundRange, signDomain);
    if (currentFoundRange)
    {
      if (!haveRange)
        newRange = plottableRange;
      else
        newRange.expand(plottableRange);
      haveRange = true;
    }
  }
  if (haveRange)
  {
    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 (mScaleType == stLinear)
      {
        newRange.lower = center-mRange.size()/2.0;
        newRange.upper = center+mRange.size()/2.0;
      } else // mScaleType == stLogarithmic
      {
        newRange.lower = center/qSqrt(mRange.upper/mRange.lower);
        newRange.upper = center*qSqrt(mRange.upper/mRange.lower);
      }
    }
    setRange(newRange);
  }
}

/*!
  Transforms \a value, in pixel coordinates of the QCustomPlot widget, to axis coordinates.