vtkAngleWidget set label to a fixed size does not work

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1

Dear all,

I want to set the text size of the angle arc to a size but it does not work. The size is very small and it is not visible. I have tried several options but only the sace waorks and i want a fixed size as the distancewidget does:

   //OPTION 1:

vtkNew<vtkAngleWidget>angleWidget;
angleWidget->SetInteractor(windows_interactor);

vtkSmartPointer<vtkAngleRepresentation2D> angle_rep =
	vtkAngleRepresentation2D::SafeDownCast(
		angleWidget->GetRepresentation());

angle_rep->SetLabelFormat("%-#6.3g grad");
angle_rep->GetArc()->GetLabelTextProperty()->SetFontSize(15);
angle_rep->GetArc()->SetLabelFactor(3.0);
angleWidget->Modified();

    //option 2
  	    vtkNew<vtkAngleWidget>angleWidget;
	angleWidget->SetInteractor(windows_interactor);
	vtkSmartPointer<vtkAngleRepresentation3D> node1 =
		 vtkSmartPointer<vtkAngleRepresentation3D>::New();
	//double scale[3] = { 0.09, 0.09, 0.09 };
	 //node1->SetTextActorScale(scale);
	 node1->GetRay1()->GetProperty()->SetColor(1, 1, 1);
	 node1->GetRay2()->GetProperty()->SetColor(1, 1, 1);
	 node1->GetArc()->GetProperty()->SetColor(1, 1, 1);
	 node1->GetTextActor()->GetProperty()->SetColor(1, 1, 1);
	 node1->GetTextActor()->GetProperty()->SetPointSize(15.0);
	 node1->GetTextActor()->GetProperty()->SetPointSize(15);
	 angleWidget->SetRepresentation(node1);
	angleWidget->CreateDefaultRepresentation();
	  
            vtkAngleRepresentation::SafeDownCast(angleWidget->GetRepresentation())
            ->SetLabelFormat("%-#6.3g grad");
	angleWidget->On();
	angleWidgets_.push_back(angleWidget);

However, the distancewidget is allowed to set a text:

    vtkNew<vtkDistanceWidget> distanceWidget;
	distanceWidget->SetInteractor(windows_interactor);
	distanceWidget->CreateDefaultRepresentation();
	vtkSmartPointer<vtkDistanceRepresentation2D> distance_rep =
		vtkDistanceRepresentation2D::SafeDownCast(
			distanceWidget->GetRepresentation());

	distance_rep->GetAxisProperty()->SetColor(1, 1, 1);
	distance_rep->GetAxis()->SetLabelFactor(3.0);
	distance_rep->SetLabelFormat("%-#6.3g mm");
	distanceWidget->On();

	//Define the size of the text label
	vtkSmartPointer<vtkAxisActor2D> axis = distance_rep->GetAxis();
	axis->UseFontSizeFromPropertyOn();
	axis->GetTitleTextProperty()->SetFontSize(15);