Documentation/Labs/ViewInfrastructureImprovements
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Revision as of 20:44, 1 December 2015 by Alexis.girault (talk | contribs)
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Contents
Goals
- Update Slicer code base to listen to interactor instead of interactor style
- Add support for interactor style switch per view
- Allow access to vtkRenderWindow from vtkMRMLViewNode
Motivation
- We would like to conveniently be able to change the interactor style without having to reset all observer for the displayable managers.
- Accessing the vtkRenderWindow would allow us to do (for example) screenshots given a specific viewNode.
InteractorStyle management
Workaround
Access 3D View
- Created a new Action menu in qSlicerMouseModeToolBar following this method.
- Accessed all qMRMLThreeDView through the layoutManager :
void qSlicerMouseModeToolBar::switchToTrackBallInteractorStyle() { qMRMLLayoutManager *layoutManager = qSlicerApplication::application()->layoutManager(); // loop through all existing threeDViews vtkNew<vtkThreeDViewInteractorStyle> interactorStyle; for (int i=0; i < layoutManager->threeDViewCount(); ++i) { qMRMLThreeDView* view = layoutManager->threeDWidget(i)->threeDView(); // Update Interactor style this->SetInteractorStyle(view, interactorStyle.GetPointer()); // Reset focal point view->resetFocalPoint(); } // Update icon Q_D(qSlicerMouseModeToolBar); d->InteractorStyleToolButton->setIcon(QIcon(":/Icons/TrackBall.png")); }
- Issue : not setting the interactor per view but for all views
- Possible solution : adding the switch in each 3D View Qt controller
Update InteractorStyle
- Set the interactorStyle to the qMRMLThreeDView interactor :
void qSlicerMouseModeToolBar::SetInteractorStyle(qMRMLThreeDView* view, vtkInteractorStyle* interactorStyle) { // Set InteractorStyle on renderview view->interactor()->SetInteractorStyle(interactorStyle); // Get DMs vtkNew<vtkCollection> collection; view->getDisplayableManagers(collection.GetPointer()); int numManagers = collection->GetNumberOfItems(); // Set and Observe InteractorStyle for cameraDM for (int i = 0; i < numManagers; ++i) { vtkMRMLCameraDisplayableManager *cameraDM = vtkMRMLCameraDisplayableManager::SafeDownCast(collection->GetItemAsObject(i)); if (cameraDM) { cameraDM->SetCameraToInteractor(); } } collection->RemoveAllItems(); }
- Issues :
- Should need to update the observations for all the DM using SetAndObserveInteractorStyle(), but this crashes Slicer.
- The camera was not set anymore after a change of interactor styles in the vtkMRMLCameraDisplayableManager, so we had to use SetCameraToInteractor() and define it as a public method.
- Possible solution : updating Slicer core so that it listen only to the interactor instead of the interactorStyle.
Design & implementation
TODO
vtkRenderWindow mapping
Workaround
- Created a method that accessed the renderWindow through the layout manager MRMLViewFactory :
vtkRenderWindow* getMRMLViewRenderWindow(vtkMRMLViewNode* viewNode) { qSlicerLayoutManager *layoutManager = qSlicerApplication::application()->layoutManager(); qMRMLThreeDWidget* threeDWidget = qobject_cast<qMRMLThreeDWidget*>(layoutManager->mrmlViewFactory("vtkMRMLViewNode")->viewWidget(viewNode)); vtkRenderWindow *renderWindow = threeDWidget->threeDView()->renderWindow(); return renderWindow; }
- Issue : calls to qMRML while we would prefer to stay with vtkMRML only
- Possible solution : map the vtkRenderWindow to the vtkMRMLViewNode in the view factory when creating the widget
Design & implementation
TODO