VTK/Examples/Cxx/Interaction/ShiftAndControl

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VTK Examples Baseline Interaction TestShiftAndControl.png

Some parts of this example are currently broken.

GetAltKey() does not work? The window moves instead.

This example demonstrates how to "control+click" and "shift+click" an actor.

ShiftAndControl.cxx

#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkObjectFactory.h>

class MouseInteractorStyleShiftAndControl : public vtkInteractorStyleTrackballActor
{
  public:
    static MouseInteractorStyleShiftAndControl* New();
 
    virtual void OnLeftButtonDown() 
    {
      if(this->Interactor->GetShiftKey())
        {
        std::cout << "Shift held. ";
        }
        
      if(this->Interactor->GetControlKey())
        {
        std::cout << "Control held. ";
        }
      
        /* this doesn't work ??? */
      if(this->Interactor->GetAltKey())
        {
        std::cout << "Alt held. ";
        }
        
      std::cout << "Pressed left mouse button." << std::endl;
      
      // Forward events
      vtkInteractorStyleTrackballActor::OnLeftButtonDown();
    }
 
};
 
vtkStandardNewMacro(MouseInteractorStyleShiftAndControl);
 
int main (int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  
  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());

  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->AddRenderer(renderer);

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

  // Add the actors to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  // Render
  renderWindow->Render();

  vtkSmartPointer<MouseInteractorStyleShiftAndControl> style = 
    vtkSmartPointer<MouseInteractorStyleShiftAndControl>::New();
  
  renderWindowInteractor->SetInteractorStyle( style );
  
  // Begin mouse interaction
  renderWindowInteractor->Start();
  
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ShiftAndControl)

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

add_executable(ShiftAndControl MACOSX_BUNDLE ShiftAndControl.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(ShiftAndControl ${VTK_LIBRARIES})
else()
  target_link_libraries(ShiftAndControl vtkHybrid vtkWidgets)
endif()

Download and Build ShiftAndControl

Click here to download ShiftAndControl. and its CMakeLists.txt file.

Once the tarball ShiftAndControl.tar has been downloaded and extracted,

cd ShiftAndControl/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:

./ShiftAndControl

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

Color.