# DisplayCoordinateAxes

VTKExamples/Cxx/Visualization/DisplayCoordinateAxes

### Description

This example shows how to display the coordinate axes in the render window.

Seealso

Axes.

Other Languages

See (Python)

### Code

DisplayCoordinateAxes.cxx

    #include <vtkActor.h>
    #include <vtkAxesActor.h>
    #include <vtkCamera.h>
    #include <vtkNamedColors.h>
    #include <vtkOrientationMarkerWidget.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkPropAssembly.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>

    int main (int, char *[])
    {
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetCenter(0.0, 0.0, 0.0);
      sphereSource->SetRadius(1.0);
      sphereSource->Update();

      vtkPolyData* polydata = sphereSource->GetOutput();

      // Create a mapper
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputData(polydata);

      // Create an actor
      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // A renderer and render window
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->SetWindowName("Display Coordinate Axes");
      renderWindow->AddRenderer(renderer);

      // An interactor
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Add the actors to the scene
      renderer->AddActor(actor);
      renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

      vtkSmartPointer<vtkAxesActor> axes =
        vtkSmartPointer<vtkAxesActor>::New();

      vtkSmartPointer<vtkOrientationMarkerWidget> widget =
        vtkSmartPointer<vtkOrientationMarkerWidget>::New();
      double rgba[4]{0.0, 0.0, 0.0, 0.0};
      colors->GetColor("Carrot",rgba);
      widget->SetOutlineColor(rgba[0], rgba[1], rgba[2]);
      widget->SetOrientationMarker( axes );
      widget->SetInteractor( renderWindowInteractor );
      widget->SetViewport( 0.0, 0.0, 0.4, 0.4 );
      widget->SetEnabled( 1 );
      widget->InteractiveOn();

      renderer->GetActiveCamera()->Azimuth(50);
      renderer->GetActiveCamera()->Elevation(-30);

      renderer->ResetCamera();
      renderWindow->Render();

      // Begin mouse interaction
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(DisplayCoordinateAxes)

    find_package(VTK COMPONENTS
      vtkCommonColor
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersSources
      vtkInteractionStyle
      vtkInteractionWidgets
      vtkRenderingAnnotation
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping DisplayCoordinateAxes: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(DisplayCoordinateAxes MACOSX_BUNDLE DisplayCoordinateAxes.cxx )
      target_link_libraries(DisplayCoordinateAxes PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(DisplayCoordinateAxes MACOSX_BUNDLE DisplayCoordinateAxes.cxx )
      target_link_libraries(DisplayCoordinateAxes PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS DisplayCoordinateAxes
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build DisplayCoordinateAxes

Click here to download DisplayCoordinateAxes and its CMakeLists.txt file. Once the tarball DisplayCoordinateAxes.tar has been downloaded and extracted,

    cd DisplayCoordinateAxes/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./DisplayCoordinateAxes

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.