Method PickFrom2D

Modules/Gizmo/src/mitkGizmoInteractor.cpp:357–395

}

mitk::Gizmo::HandleType mitk::GizmoInteractor::PickFrom2D(const InteractionPositionEvent *positionEvent)
{
  BaseRenderer *renderer = positionEvent->GetSender();

  auto mapper = GetDataNode()->GetMapper(BaseRenderer::Standard2D);
  auto gizmo_mapper = dynamic_cast<GizmoMapper2D *>(mapper);
  auto &picker = m_Picker[renderer];

  if (picker == nullptr)
  {
    picker = vtkSmartPointer<vtkCellPicker>::New();
    picker->SetTolerance(0.005);

    if (gizmo_mapper)
    { // doing this each time is bizarre
      picker->AddPickList(gizmo_mapper->GetVtkProp(renderer));
      picker->PickFromListOn();
    }
  }

  auto displayPosition = positionEvent->GetPointerPositionOnScreen();
  picker->Pick(displayPosition[0], displayPosition[1], 0, positionEvent->GetSender()->GetVtkRenderer());

  vtkIdType pickedPointID = picker->GetPointId();
  if (pickedPointID == -1)
  {
    return Gizmo::NoHandle;
  }

  vtkPolyData *polydata = gizmo_mapper->GetVtkPolyData(renderer);

  if (polydata && polydata->GetPointData() && polydata->GetPointData()->GetScalars())
  {
    double dataValue = polydata->GetPointData()->GetScalars()->GetTuple1(pickedPointID);
    return m_Gizmo->GetHandleFromPointDataValue(dataValue);
  }

  return Gizmo::NoHandle;
}

mitk::Gizmo::HandleType mitk::GizmoInteractor::PickFrom3D(const InteractionPositionEvent *positionEvent)
{