Method cleanMantissa

qcustomplot/qcustomplot.cpp:5829–5849

! \internal Returns a number that is close to \a input but has a clean, easier human readable mantissa. How strongly the mantissa is altered, and thus how strong the result deviates from the original \a input, depends on the current tick step strategy (see \ref setTickStepStrategy). */

  input, depends on the current tick step strategy (see \ref setTickStepStrategy).
*/
double QCPAxisTicker::cleanMantissa(double input) const
{
  double magnitude;
  const double mantissa = getMantissa(input, &magnitude);
  switch (mTickStepStrategy)
  {
    case tssReadability:
    {
      return pickClosest(mantissa, QVector<double>() << 1.0 << 2.0 << 2.5 << 5.0 << 10.0)*magnitude;
    }
    case tssMeetTickCount:
    {
      // this gives effectively a mantissa of 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 6.0, 8.0, 10.0
      if (mantissa <= 5.0)
        return (int)(mantissa*2)/2.0*magnitude; // round digit after decimal point to 0.5
      else
        return (int)(mantissa/2.0)*2.0*magnitude; // round to first digit in multiples of 2
    }
  }
  return input;
}
/* end of 'src/axis/axisticker.cpp' */