# Cursor2D

VTKExamples/Cxx/Visualization/Cursor2D

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See (Java)

### Code

Cursor2D.cxx

    #include <vtkSmartPointer.h>
    #include <vtkCursor2D.h>

    #include <vtkSphereSource.h>
    #include <vtkProperty.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    #include <vtkNamedColors.h>

    int main(int, char *[])
    {
      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetCenter(0.0, 0.0, 0.0);
      sphereSource->SetRadius(5.0);
      sphereSource->Update();

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(sphereSource->GetOutputPort());

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

      // Create a renderer, render window, and interactor
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Add the actor to the scene
      renderer->AddActor(actor);

      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();
      renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

      vtkSmartPointer<vtkCursor2D> cursor =
        vtkSmartPointer<vtkCursor2D>::New();
      cursor->SetModelBounds(-10,10,-10,10,0,0);
      cursor->AllOn();
      cursor->SetFocalPoint (5.0, 5.0, 0.0);
      cursor->OutlineOn();
      cursor->Update();

      vtkSmartPointer<vtkPolyDataMapper> cursorMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      cursorMapper->SetInputConnection(cursor->GetOutputPort());
      vtkSmartPointer<vtkActor> cursorActor =
        vtkSmartPointer<vtkActor>::New();
      cursorActor->GetProperty()->SetColor(1,0,0);
      cursorActor->SetMapper(cursorMapper);
      renderer->AddActor(cursorActor);

      // Render and interact
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(Cursor2D)

    find_package(VTK COMPONENTS
      vtkCommonColor
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersGeneral
      vtkFiltersSources
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping Cursor2D: ${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(Cursor2D MACOSX_BUNDLE Cursor2D.cxx )
      target_link_libraries(Cursor2D PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(Cursor2D MACOSX_BUNDLE Cursor2D.cxx )
      target_link_libraries(Cursor2D PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS Cursor2D
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build Cursor2D

Click here to download Cursor2D and its CMakeLists.txt file. Once the tarball Cursor2D.tar has been downloaded and extracted,

    cd Cursor2D/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:

    ./Cursor2D

WINDOWS USERS

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