vtk事件，Qt槽
vtkEventQtSlotConnect* _connections = vtkEventQtSlotConnect::New(); // update coords as we mouse pressed through the window
_connections->Connect(_qvtkWidget->GetRenderWindow()->GetInteractor(),vtkCommand::RightButtonPressEvent, this,SLOT(slot_updateCoords(vtkObject*)));
实现槽函数即可
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