Method MapControlPointsToLogSpace

Remoting/Views/vtkSMTransferFunctionProxy.cxx:730–768

----------------------------------------------------------------------------

//----------------------------------------------------------------------------
bool vtkSMTransferFunctionProxy::MapControlPointsToLogSpace(bool inverse /*=false*/)
{
  vtkSMProperty* controlPointsProperty = GetControlPointsProperty(this);
  if (!controlPointsProperty)
  {
    return false;
  }

  SM_SCOPED_TRACE(CallMethod)
    .arg(this)
    .arg(inverse ? "MapControlPointsToLinearSpace" : "MapControlPointsToLogSpace")
    .arg("comment", inverse ? "convert from log to linear" : "convert to log space");

  vtkSMPropertyHelper cntrlPoints(controlPointsProperty);
  unsigned int num_elements = cntrlPoints.GetNumberOfElements();
  if (num_elements == 0 || num_elements == 4)
  {
    // nothing to do, but not an error, so return true.
    return true;
  }

  std::vector<vtkTuple<double, 4>> points;
  points.resize(num_elements / 4);
  cntrlPoints.Get(points[0].GetData(), num_elements);

  vtkTuple<double, 2> range;
  vtkNormalize(points, inverse, &range); // if inverse==true, we're in log-space currently.
  if (range[0] >= range[1])
  {
    vtkWarningMacro("Empty range! Cannot map control points.");
    return false;
  }
  vtkRescaleNormalizedControlPoints(points, range[0], range[1], !inverse);
  this->LastRange[0] = range[0];
  this->LastRange[1] = range[1];
  cntrlPoints.Set(points[0].GetData(), num_elements);
  this->UpdateVTKObjects();
  return true;
}

//----------------------------------------------------------------------------
bool vtkSMTransferFunctionProxy::ApplyColorMap(const char* text)