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SphereWidget

vtk-examples/Cxx/Widgets/SphereWidget


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Question

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Code

SphereWidget.cxx

#include <vtkActor.h>
#include <vtkCommand.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereRepresentation.h>
#include <vtkSphereSource.h>
#include <vtkSphereWidget.h>

namespace {
class SphereCallback : public vtkCommand
{
public:
  static SphereCallback* New()
  {
    return new SphereCallback;
  }
  SphereCallback()
  {
  }

  virtual void Execute(vtkObject* caller, unsigned long, void*)
  {

    vtkSphereWidget* sphereWidget = reinterpret_cast<vtkSphereWidget*>(caller);

    double center[3];
    sphereWidget->GetCenter(center);
    std::cout << "Center: " << center[0] << " " << center[1] << " " << center[2]
              << std::endl;
  }
};
} // namespace

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // A renderer and render window
  vtkNew<vtkRenderer> renderer;
  renderer->SetBackground(colors->GetColor3d("MidnightBlue").GetData());

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("SphereWidget");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  vtkNew<vtkSphereWidget> sphereWidget;
  sphereWidget->SetInteractor(renderWindowInteractor);
  sphereWidget->SetRepresentationToSurface();
  sphereWidget->GetSphereProperty()->SetColor(
      colors->GetColor3d("BurlyWood").GetData());

  vtkNew<SphereCallback> sphereCallback;

  sphereWidget->AddObserver(vtkCommand::InteractionEvent, sphereCallback);

  renderWindow->Render();
  renderWindowInteractor->Initialize();
  renderWindow->Render();
  sphereWidget->On();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(SphereWidget)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkInteractionWidgets
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping SphereWidget: ${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(SphereWidget MACOSX_BUNDLE SphereWidget.cxx )
  target_link_libraries(SphereWidget PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(SphereWidget MACOSX_BUNDLE SphereWidget.cxx )
  target_link_libraries(SphereWidget PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS SphereWidget
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build SphereWidget

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

cd SphereWidget/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:

./SphereWidget

WINDOWS USERS

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