Function AdjustAndSplitRange

Rendering/Annotation/vtkAxisActor2D.cxx:255–299

* Update Range, so outRange can be split into `numberOfTick` * rounded values, including bounds. * * @see SnapTicksToRoundValues */

 * @see SnapTicksToRoundValues
 */
void AdjustAndSplitRange(double inRange[2], int inNumTicks, double outRange[2], int& numberOfTicks)
{
  // Handle the range
  double sRange[2];
  if (inRange[0] < inRange[1])
  {
    sRange[0] = inRange[0];
    sRange[1] = inRange[1];
  }
  else if (inRange[0] > inRange[1])
  {
    sRange[1] = inRange[0];
    sRange[0] = inRange[1];
  }
  else // they're equal, so perturb them by 1 percent
  {
    double perturb = 100.;
    if (inRange[0] == 0.0)
    { // if they are both zero, then just perturb about zero
      sRange[0] = -1 / perturb;
      sRange[1] = 1 / perturb;
    }
    else
    {
      sRange[0] = inRange[0] - inRange[0] / perturb;
      sRange[1] = inRange[0] + inRange[0] / perturb;
    }
  }

  double interval;
  numberOfTicks = details::SnapTicksToRoundValues(sRange, inNumTicks, interval);

  // round range to start on a multiple of Interval.
  outRange[0] = static_cast<int>(sRange[0] / interval) * interval;
  outRange[1] = outRange[0] + (numberOfTicks - 1) * interval;

  // Adjust if necessary
  if (inRange[0] > inRange[1])
  {
    sRange[0] = outRange[1];
    outRange[1] = outRange[0];
    outRange[0] = sRange[0];
    interval = -interval;
  }
}

};