Method Initialize

Imaging/Core/vtkAbstractImageInterpolator.cxx:261–303

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//------------------------------------------------------------------------------
void vtkAbstractImageInterpolator::Initialize(vtkDataObject* o)
{
  // free any previous scalars
  this->ReleaseData();

  // check for valid data
  vtkImageData* data = vtkImageData::SafeDownCast(o);
  vtkDataArray* scalars = nullptr;
  if (data)
  {
    scalars = data->GetPointData()->GetScalars();
  }

  if (data == nullptr || scalars == nullptr)
  {
    vtkErrorMacro("Initialize(): no image data to interpolate!");
    return;
  }

  // claim the scalars
  scalars->Register(this);
  this->Scalars = scalars;

  // get the image information
  data->GetSpacing(this->Spacing);
  vtkMatrix3x3* matrix = data->GetDirectionMatrix();
  if (matrix->IsIdentity())
  {
    this->UseDirection = false;
    vtkMatrix3x3::Identity(this->Direction);
  }
  else
  {
    this->UseDirection = true;
    vtkMatrix3x3::DeepCopy(this->Direction, data->GetDirectionMatrix());
    vtkMatrix3x3::Invert(this->Direction, this->InverseDirection);
  }
  data->GetOrigin(this->Origin);
  data->GetExtent(this->Extent);

  // call update
  this->Update();
}

//------------------------------------------------------------------------------
void vtkAbstractImageInterpolator::ReleaseData()