QvtkWidget 和 vtkImageViewer2 改变default mouse interactorStyle

重载的vtkInteractorStyleTrackballCamera 也可以是子类 vtkInteractorImage. 同时要注意qvtk 与vtkImageViewer的 RenderWindow与Interactor的共享, 多以qvtk为准. SetInteractor 一定要在 SetRenderWindow之前, 以避免error出现.

"viewer.h"

// Overwrite default interaction style

class MouseInteractorStyle : public vtkInteractorStyleTrackballCamera

{

  public:

    static MouseInteractorStyle* New();

    vtkTypeMacro(MouseInteractorStyle, vtkInteractorStyleTrackballCamera);

    virtual void OnLeftButtonDown()

    {

      std::cout << "Pressed left mouse button." << std::endl;

      // Forward events

      // vtkInteractorStyleTrackballCamera::OnLeftButtonDown();

    }

    virtual void OnMiddleButtonDown()

    {

      std::cout << "Pressed middle mouse button." << std::endl;

      // Forward events

      // vtkInteractorStyleTrackballCamera::OnMiddleButtonDown();

    }

    virtual void OnRightButtonDown()

    {

      std::cout << "Pressed right mouse button." << std::endl;

      // Forward events

      // vtkInteractorStyleTrackballCamera::OnRightButtonDown();

    }

    virtual void OnMouseWheelForward()

    {

        std::cout << "Forward scroll mouse wheel." << std::endl;

        // Forward events

        // vtkInteractorStyleTrackballCamera::OnMouseWheelForward();

    }

    virtual void OnMouseWheelBackward()

    {

        std::cout << "Forward scroll mouse wheel." << std::endl;

        // Forward events

        // vtkInteractorStyleTrackballCamera::OnMouseWheelBackward();

    }

};

"viewer.cpp"

#define VTK_CREATE(type, name) \

  vtkSmartPointer name = vtkSmartPointer::New()

vtkStandardNewMacro(MouseInteractorStyle);

// QVtk objects

    this->render1 = vtkSmartPointer<vtkRenderer>::New();

    this->viewerAxial = vtkSmartPointer<vtkImageViewer2>::New();

 // Enable connections between VTK event and Qt slots

    //    VTK_CREATE(vtkEventQtSlotConnect, connection);

    connection = vtkSmartPointer<vtkEventQtSlotConnect>::New();

    // Setup mouse event, called before default vtkinteractor

    connection->Connect(this->ui->qvtkWidget_1->GetInteractor(),

                        vtkCommand::MouseWheelForwardEvent,

                        this,

                        SLOT(mouseWheelForwardCallback(vtkObject*,ulong,void*,void*,vtkCommand*)),

                        NULL,1.0);   // set priority

    connection->Connect(this->ui->qvtkWidget_1->GetInteractor(),

                        vtkCommand::MouseWheelBackwardEvent,

                        this,

                        SLOT(mouseWheelBackwardCallback(vtkObject*,ulong,void*,void*,vtkCommand*)),

                        NULL,1.0);   // set priority

    connection->Connect(this->ui->qvtkWidget_1->GetRenderWindow()->GetInteractor(),

                        vtkCommand::MouseMoveEvent,

                        this,

                        SLOT(animateSlider(vtkObject*)));

    connection->Connect(this->ui->qvtkWidget_1->GetInteractor(),

                        vtkCommand::LeftButtonPressEvent,

                        this,

                        SLOT(animateSlider(vtkObject*)));

    connection->PrintSelf(std::cout, vtkIndent());

//  Declare vtk renderwindow

    this->viewerAxial->SetInput(reader->GetOutput());

    this->viewerAxial->UpdateDisplayExtent();

    this->viewerAxial->SetupInteractor(this->ui->qvtkWidget_1->GetRenderWindow()->GetInteractor());

    //    this->viewerAxial->SetRenderWindow(this->ui->qvtkWidget_1->GetRenderWindow());

    this->ui->qvtkWidget_1->SetRenderWindow(this->viewerAxial->GetRenderWindow());

    // Disable deafult style

    this->ui->qvtkWidget_1->GetInteractor()->GetInteractorStyle()->EnabledOff();

    this->ui->qvtkWidget_1->GetInteractor()->Disable();

    VTK_CREATE(MouseInteractorStyle, interactorStyle);

    this->ui->qvtkWidget_1->GetInteractor()->SetInteractorStyle(interactorStyle);

    this->ui->qvtkWidget_1->GetInteractor()->Initialize();

    //    this->ui->qvtkWidget_1->GetInteractor()->Start();

    //    this->viewerAxial->SetRenderer(render1);

    this->viewerAxial->GetRenderer()->ResetCamera();

    //  Filp y axis

    this->viewerAxial->GetRenderer()->GetActiveCamera()->SetRoll(180.0);

    this->viewerAxial->SetSlice(10);

    this->viewerAxial->Render();

void Viewer::mouseWheelForwardCallback(vtkObject * obj, unsigned long,

                                       void * client_data, void *,

                                       vtkCommand * command)

{

    this->ui->verticalSlider_1->setValue(this->ui->verticalSlider_1->value()+1);

    UpdateWidget();

}

void Viewer::mouseWheelBackwardCallback(vtkObject * obj, unsigned long,

                                        void * client_data, void *,

                                        vtkCommand * command)

{

    this->ui->verticalSlider_1->setValue(this->ui->verticalSlider_1->value()-1);

    UpdateWidget();

}