[vtkusers] Overriding QVTKWidget interactor style

[Elvis Stansvik]

2017-02-21 16:13 GMT+01:00 Mwoua <david.levy at leddartech.com>:
> Hello,
> im new to VTK and I can't find a way to override the interactor style to
> remap keyboard event. I'm using the point cloud library viewer, but I think
> my issue is related to the QVTKWidget.
>
> Here is my code :
>
>     boost::shared_ptr<pcl::visualization::PCLVisualizer> mViewer;
>     QVTKWidget *mVTKWidget;
>
>     // Set up the QVTK window
>     mViewer =
> boost::make_shared<pcl::visualization::PCLVisualizer>("viewer", false);
>     mVTKWidget->SetRenderWindow (mViewer->getRenderWindow ());
>     auto lInteractor = mVTKWidget->GetInteractor ();
>     auto lInteractorStyle = CustomInteractor::New();
>     lInteractor->SetInteractorStyle(lInteractorStyle);
>     mViewer->setupInteractor (lInteractor, mVTKWidget->GetRenderWindow ());

^ this line will reset the interactor to the default style, so it'll
overwrite what you set earlier. Use this overload instead [2]:

void pcl::visualization::PCLVisualizer::setupInteractor (
vtkRenderWindowInteractor *  iren, vtkRenderWindow *  win,
vtkInteractorStyle *  style  )

E.g:

    mViewer->setupInteractor (lInteractor, mVTKWidget->GetRenderWindow
(), lInteractorStyle);

With that, I don't think you need to do
lInteractor->SetInteractorStyle(lInteractorStyle). It will be done for
you by setupInteractor [3].

Hope that helps,
Elvis

[1] http://docs.pointclouds.org/trunk/classpcl_1_1visualization_1_1_p_c_l_visualizer.html#a9f2ab0047663bcd23e48cf39b74145de
[2] http://docs.pointclouds.org/trunk/classpcl_1_1visualization_1_1_p_c_l_visualizer.html#a26b785bcbdf1aaec1db1e1cfa15aa5f4
[3] https://github.com/PointCloudLibrary/pcl/blob/master/visualization/src/pcl_visualizer.cpp#L377

>
>     mVTKWidget->update ();
>
> And my custom interactor just to try things :
> class CustomInteractor : public
> pcl::visualization::PCLVisualizerInteractorStyle
> {
>     void OnChar() override {}
>     void OnKeyDown ()override {}
>     void OnKeyUp ()override {}
> };
>
>
> PCLVisualizerInteractorStyle inherits from vtkInteractorStyleRubberBandPick.
>
> I might be missing something easy, but im out of idea.
>
> Thanks
>
>
>
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