VTK/Examples/Cxx/Interaction/DoubleClick

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VTK Examples Baseline Interaction TestDoubleClick.png

DoubleClick.cxx

#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkSmartPointer.h>
#include <vtkPointPicker.h>
#include <vtkCamera.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h>
  
// Define interaction style
class MouseInteractorStyleDoubleClick : public vtkInteractorStyleTrackballCamera
{
  public:
     
    static MouseInteractorStyleDoubleClick* New();
    vtkTypeMacro(MouseInteractorStyleDoubleClick, vtkInteractorStyleTrackballCamera);
 
    MouseInteractorStyleDoubleClick() : NumberOfClicks(0), ResetPixelDistance(5) 
    { 
      this->PreviousPosition[0] = 0;
      this->PreviousPosition[1] = 0;
    }
    
    virtual void OnLeftButtonDown() 
    {
      //std::cout << "Pressed left mouse button." << std::endl;
      this->NumberOfClicks++;
      //std::cout << "NumberOfClicks = " << this->NumberOfClicks << std::endl;
      int pickPosition[2];
      this->GetInteractor()->GetEventPosition(pickPosition);

      int xdist = pickPosition[0] - this->PreviousPosition[0];
      int ydist = pickPosition[1] - this->PreviousPosition[1];

      this->PreviousPosition[0] = pickPosition[0];
      this->PreviousPosition[1] = pickPosition[1];

      int moveDistance = (int)sqrt((double)(xdist*xdist + ydist*ydist));

      // Reset numClicks - If mouse moved further than resetPixelDistance
      if(moveDistance > this->ResetPixelDistance)
        { 
        this->NumberOfClicks = 1;
        }
        
      
      if(this->NumberOfClicks == 2)
        {
        std::cout << "Double clicked." << std::endl;
        this->NumberOfClicks = 0;
        }
      // forward events
      vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
    }
 
  private:
    unsigned int NumberOfClicks;
    int PreviousPosition[2];
    int ResetPixelDistance;
};
vtkStandardNewMacro(MouseInteractorStyleDoubleClick);
 
int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetCenter(0.0, 0.0, 0.0);
  sphereSource->SetRadius(5.0);
  sphereSource->Update();
 
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());
 
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
 
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  renderer->SetBackground(1,1,1); // Background color white
  renderer->AddActor(actor);
 
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow ( renderWindow );
 
  vtkSmartPointer<MouseInteractorStyleDoubleClick> style =
    vtkSmartPointer<MouseInteractorStyleDoubleClick>::New();
  renderWindowInteractor->SetInteractorStyle( style );
 
  renderWindowInteractor->Initialize();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(DoubleClick)

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

add_executable(DoubleClick MACOSX_BUNDLE DoubleClick.cxx)

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

Download and Build DoubleClick

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

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

cd DoubleClick/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:

./DoubleClick

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.

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