QvtkWidget 和 vtkImageViewer2 改变default mouse interactorStyle

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本文介绍了如何重载默认的vtkInteractorStyleTrackballCamera，创建自定义的MouseInteractorStyle，以改变QvtkWidget和vtkImageViewer2的鼠标交互事件，包括左键、中键、右键点击以及滚轮事件。同时，通过vtkEventQtSlotConnect连接VTK事件和Qt槽函数，实现特定的交互响应。在设置过程中，特别强调了SetRenderWindow和SetInteractor的顺序以及优先级设置。

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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<type> name = vtkSmartPointer<type>::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();
}