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# SplineWidget

VTKEx/Cxx/Widgets/SplineWidget

### Description

Note

This original source code for this example is here.

Other languages

See (Java)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### Code

SplineWidget.cxx

    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSmartPointer.h>
    #include <vtkSplineWidget2.h>

    int main(int, char *[])
    {
      // A renderer and render window
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

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

      vtkSmartPointer<vtkSplineWidget2> splineWidget =
        vtkSmartPointer<vtkSplineWidget2>::New();
      splineWidget->SetInteractor(renderWindowInteractor);

      renderWindowInteractor->Initialize();
      renderWindow->Render();
      splineWidget->On();
      renderer->ResetCamera();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(SplineWidget)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkInteractionStyle
      vtkInteractionWidgets
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping SplineWidget: ${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(SplineWidget MACOSX_BUNDLE SplineWidget.cxx )
      target_link_libraries(SplineWidget PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(SplineWidget MACOSX_BUNDLE SplineWidget.cxx )
      target_link_libraries(SplineWidget PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS SplineWidget
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build SplineWidget

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

    cd SplineWidget/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:

    ./SplineWidget

WINDOWS USERS

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