SphereWidget

VTKExamples/Cxx/Widgets/SphereWidget


Code

SphereWidget.cxx

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

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;
    }

};

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<vtkSphereWidget> sphereWidget = 
    vtkSmartPointer<vtkSphereWidget>::New();
  sphereWidget->SetInteractor(renderWindowInteractor);
  sphereWidget->SetRepresentationToSurface();

  vtkSmartPointer<SphereCallback> sphereCallback = 
    vtkSmartPointer<SphereCallback>::New();

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

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(SphereWidget)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(SphereWidget MACOSX_BUNDLE SphereWidget.cxx )

target_link_libraries(SphereWidget ${VTK_LIBRARIES})

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.