vtk图片显示¶

 qDebug();
    if (this->vmtk_renderer_ == nullptr) {
        qWarning() << "renderer is null";
        return false;
    }
    if (this->actor_ == nullptr) {
        this->actor_ = vtkSmartPointer<vtkImageActor>::New();
    }
    this->actor_->SetInputData(this->image_);
    this->vmtk_renderer_->GetRenderer()->AddActor(this->actor_);
    if (this->scale_actor_ == nullptr) {
        this->scale_actor_ = vtkSmartPointer<vtkLegendScaleActor>::New();
    }
    this->scale_actor_->SetLabelMode(1);
    this->scale_actor_->TopAxisVisibilityOff();
    this->scale_actor_->LeftAxisVisibilityOn();
    this->scale_actor_->BottomAxisVisibilityOff();
    this->scale_actor_->RightAxisVisibilityOff();
    this->scale_actor_->LegendVisibilityOff();
    this->scale_actor_->SetLeftBorderOffset(90);
    this->scale_actor_->SetBottomBorderOffset(35);
    this->scale_actor_->SetTopBorderOffset(35);
    this->scale_actor_->GetLeftAxis()->SetNumberOfLabels(5);
    this->scale_actor_->GetLeftAxis()->SetAdjustLabels(true);
    this->scale_actor_->GetLeftAxis()->SetFontFactor(1);
    this->vmtk_renderer_->GetRenderer()->AddActor(this->scale_actor_);
    double origin[3];
    double spacing[3];
    int extent[6];
    this->image_->GetOrigin(origin);
    this->image_->GetSpacing(spacing);
    this->image_->GetExtent(extent);
    vtkSmartPointer<vtkCamera> camera =
        this->vmtk_renderer_->GetRenderer()->GetActiveCamera();
    camera->ParallelProjectionOn();
    double xc = origin[0] + 0.5 * (extent[0] + extent[1]) * spacing[0];
    double yc = origin[1] + 0.5 * (extent[2] + extent[3]) * spacing[1];
    double xd = (extent[1] - extent[0] + 1) * spacing[0];
    double yd = (extent[3] - extent[2] + 1) * spacing[1];
    double d = camera->GetDistance();
    Q_UNUSED(xd)
    camera->SetFocalPoint(xc, yc, 0.0);
    camera->SetPosition(xc, yc, d);
    camera->SetParallelScale(0.5 * (yd - 1));
    this->vmtk_renderer_->Render();