Method ProcessKeyEvents

Interaction/Widgets/vtkLineWidget2.cxx:338–404

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//------------------------------------------------------------------------------
void vtkLineWidget2::ProcessKeyEvents(vtkObject*, unsigned long event, void* clientdata, void*)
{
  vtkLineWidget2* self = static_cast<vtkLineWidget2*>(clientdata);
  vtkLineRepresentation* rep = vtkLineRepresentation::SafeDownCast(self->WidgetRep);
  char* cKeySym = self->Interactor->GetKeySym();
  std::string keySym = cKeySym != nullptr ? cKeySym : "";
  std::transform(keySym.begin(), keySym.end(), keySym.begin(), ::toupper);
  if (event == vtkCommand::KeyPressEvent)
  {
    if (keySym == "X")
    {
      rep->GetPoint1Representation()->SetXTranslationAxisOn();
      rep->GetPoint2Representation()->SetXTranslationAxisOn();
      rep->GetLineHandleRepresentation()->SetXTranslationAxisOn();
      rep->GetPoint1Representation()->SetConstrained(true);
      rep->GetPoint2Representation()->SetConstrained(true);
      rep->GetLineHandleRepresentation()->SetConstrained(true);
    }
    else if (keySym == "Y")
    {
      rep->GetPoint1Representation()->SetYTranslationAxisOn();
      rep->GetPoint2Representation()->SetYTranslationAxisOn();
      rep->GetLineHandleRepresentation()->SetYTranslationAxisOn();
      rep->GetPoint1Representation()->SetConstrained(true);
      rep->GetPoint2Representation()->SetConstrained(true);
      rep->GetLineHandleRepresentation()->SetConstrained(true);
    }
    else if (keySym == "Z")
    {
      rep->GetPoint1Representation()->SetZTranslationAxisOn();
      rep->GetPoint2Representation()->SetZTranslationAxisOn();
      rep->GetLineHandleRepresentation()->SetZTranslationAxisOn();
      rep->GetPoint1Representation()->SetConstrained(true);
      rep->GetPoint2Representation()->SetConstrained(true);
      rep->GetLineHandleRepresentation()->SetConstrained(true);
    }
    else if (keySym == "L")
    {
      double p1[3], p2[3], v[3];
      rep->GetPoint1WorldPosition(p1);
      rep->GetPoint2WorldPosition(p2);
      vtkMath::Subtract(p2, p1, v);
      vtkMath::Normalize(v);
      rep->GetPoint1Representation()->SetCustomTranslationAxisOn();
      rep->GetPoint1Representation()->SetCustomTranslationAxis(v);
      rep->GetPoint2Representation()->SetCustomTranslationAxisOn();
      rep->GetPoint2Representation()->SetCustomTranslationAxis(v);
      rep->GetLineHandleRepresentation()->SetCustomTranslationAxisOn();
      rep->GetLineHandleRepresentation()->SetCustomTranslationAxis(v);
      rep->GetPoint1Representation()->SetConstrained(true);
      rep->GetPoint2Representation()->SetConstrained(true);
      rep->GetLineHandleRepresentation()->SetConstrained(true);
    }
  }
  else if (event == vtkCommand::KeyReleaseEvent)
  {
    if (keySym == "L" || keySym == "X" || keySym == "Y" || keySym == "Z")
    {