[vtkusers] change size of Axes text

[tony zhang]

I am trying to add axes to a window and have an issue to change font size
of axis test. The partial code is as following:

    cube = vtkSmartPointer<vtkAnnotatedCubeActor>::New();
    cube->SetXPlusFaceText("R");
    cube->SetXMinusFaceText("L");
    cube->SetYPlusFaceText("A");
    cube->SetYMinusFaceText("P");
    cube->SetZPlusFaceText("I");
    cube->SetZMinusFaceText("S");
    cube->SetXFaceTextRotation(180);
    cube->SetYFaceTextRotation(180);
    cube->SetZFaceTextRotation(-90);
    cube->SetFaceTextScale(0.65);

    vtkSmartPointer<vtkProperty> cube_property = cube->GetCubeProperty();
    cube_property->SetColor(0.5, 1, 1);

    cube_property = cube->GetTextEdgesProperty();
    cube_property->SetLineWidth(1);
    cube_property->SetDiffuse(0);
    cube_property->SetAmbient(1);
    cube_property->SetColor(0.18, 0.28, 0.23);

    cube_property = cube->GetXPlusFaceProperty();
    cube_property->SetColor(0,0,1);
    cube_property->SetInterpolationToFlat();

    cube_property = cube->GetXMinusFaceProperty();
    cube_property->SetColor(0,0,1);
    cube_property->SetInterpolationToFlat();

    cube_property = cube->GetYPlusFaceProperty();
    cube_property->SetColor(0,1,0);
    cube_property->SetInterpolationToFlat();

    cube_property = cube->GetYMinusFaceProperty();
    cube_property->SetColor(0,1,0);
    cube_property->SetInterpolationToFlat();

    cube_property = cube->GetZPlusFaceProperty();
    cube_property->SetColor(1,0,0);
    cube_property->SetInterpolationToFlat();

    cube_property = cube->GetZMinusFaceProperty();
    cube_property->SetColor(1,0,0);
    cube_property->SetInterpolationToFlat();

    axes = vtkSmartPointer<vtkAxesActor>::New();
    axes->SetShaftTypeToCylinder();
    axes->SetXAxisLabelText("x");
    axes->SetYAxisLabelText("y");
    axes->SetZAxisLabelText("z");
    axes->SetTotalLength(1.5, 1.5, 1.5);

    vtkSmartPointer<vtkTextProperty> tprop =
vtkSmartPointer<vtkTextProperty>::New();
    tprop->ItalicOn();
    tprop->ShadowOn();
    tprop->SetFontFamilyToTimes();
    std::cout << tprop->GetFontSize();
    tprop->SetFontSize(18);
    axes->GetXAxisCaptionActor2D()->SetCaptionTextProperty(tprop);

    vtkSmartPointer<vtkTextProperty> tprop2 =
vtkSmartPointer<vtkTextProperty>::New();
    tprop2->ShallowCopy(tprop);
    axes->GetYAxisCaptionActor2D()->SetCaptionTextProperty(tprop2);

    vtkSmartPointer<vtkTextProperty> tprop3 =
vtkSmartPointer<vtkTextProperty>::New();
    tprop3->ShallowCopy(tprop);
    axes->GetZAxisCaptionActor2D()->SetCaptionTextProperty(tprop3);

    assembly = vtkSmartPointer<vtkPropAssembly>::New();
    assembly->AddPart(axes);
    assembly->AddPart(cube);

    marker = vtkSmartPointer<vtkOrientationMarkerWidget>::New();
    marker->SetOutlineColor(0.93, 0.57, 0.13);
    marker->SetOrientationMarker(assembly);

    iact = renWinImage->GetInteractor();
    iact_style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
    iact->SetInteractorStyle(iact_style);

    marker->SetInteractor(iact);
    marker->SetEnabled(1);
    marker->InteractiveOff();

    renWinImage->Render();

The font of axes text X, Y and Z looks small. I tried to set up larger font
size ( tprop->SetFontSize(18);) and it seems not working. The "std::cout <<
tprop->GetFontSize();" does not print out the size when the program is
started. It shows default size "12" when I close the program. My questions
are:
(1) is SetFontSize() the right method to change the font size?
(2) if it is the right function to use, what I should pay attention to make
it effective?

Thanks ahead for any help.
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