[vtkusers] Information during callback / vtkImplicitPlaneWidget2

[Sebastian Gatzka]

Sorry to bother again. Your code is not working as planned.

It runs, cuts the sphere in half and displays "Hello World".
When interacting with the implicitPlaneWidget (which is possible: 
translation, rotation etc.) nothing happens to the sphere and even the 
counter does not take effect.

When pressing "e" the code crashes with a heap corruption.

Is there something wrong with our compiler, or did you miss to tell me 
anything about using callback functions?
By the way: Is there any kind of tutorial about how to handle a callback 
function correctly?!


Am 12.03.2010 15:42, schrieb David Doria:
>
> On Fri, Mar 12, 2010 at 7:17 AM, Sebastian Gatzka 
> <sebastian.gatzka at stud.tu-darmstadt.de 
> <mailto:sebastian.gatzka at stud.tu-darmstadt.de>> wrote:
>
>     Or can I talk to the textActor like this?
>
>         vtkTextActor *ta = reinterpret_cast<vtkTextActor*>(caller);
>         ta->SetInput("TEST");
>
>     or like this?
>
>        this->TextActor->SetInput("TEST");
>
>     No, does not work either way.
>
>
> Ok, let's close this question - here is an example that updates a 
> counter in the lower left corner of the renderwindow every time an 
> interaction occurs. This should be easy to adapt to do what you want.
>
> #include <sstream>
>
> #include <vtkSmartPointer.h>
> #include <vtkProperty.h>
> #include <vtkTextProperty.h>
>
> #include <vtkXMLPolyDataReader.h>
> #include <vtkSphereSource.h>
> #include <vtkClipPolyData.h>
> #include <vtkPlane.h>
>
> #include <vtkCommand.h>
> #include <vtkImplicitPlaneWidget2.h>
> #include <vtkImplicitPlaneRepresentation.h>
> #include <vtkPolyDataMapper.h>
> #include <vtkProperty.h>
> #include <vtkActor.h>
> #include <vtkTextActor.h>
> #include <vtkRenderWindow.h>
> #include <vtkRenderer.h>
> #include <vtkRenderWindowInteractor.h>
>
> // Callback for the interaction
> // This does the actual work: updates the vtkPlane implicit function.
> // This in turn causes the pipeline to update and clip the object.
> class vtkIPWCallback : public vtkCommand
> {
>   public:
>     static vtkIPWCallback *New()
>     {
>       return new vtkIPWCallback;
>     }
>     virtual void Execute(vtkObject *caller, unsigned long, void*)
>     {
>       vtkImplicitPlaneWidget2 *planeWidget =
>           reinterpret_cast<vtkImplicitPlaneWidget2*>(caller);
>       vtkImplicitPlaneRepresentation *rep =
>          
>  reinterpret_cast<vtkImplicitPlaneRepresentation*>(planeWidget->GetRepresentation());
>       rep->GetPlane(this->Plane);
>       std::stringstream ss;
>       ss << this->counter;
>       this->TextActor->SetInput (ss.str().c_str());
>       this->counter++;
>     }
>     vtkIPWCallback():Plane(0),TextActor(0),counter(0) {}
>     void SetPlane(vtkPlane* plane) { this->Plane = plane;}
>     void SetTextActor(vtkTextActor* textActor) { this->TextActor = 
> textActor;}
>   private:
>     unsigned int counter;
>     vtkPlane* Plane;
>     vtkTextActor* TextActor;
>
> };
>
> int main(int argc, char *argv[])
> {
>   vtkSmartPointer<vtkSphereSource> sphereSource =
>       vtkSmartPointer<vtkSphereSource>::New();
>   sphereSource->SetRadius(10.0);
>
>   vtkSmartPointer<vtkXMLPolyDataReader> reader =
>       vtkSmartPointer<vtkXMLPolyDataReader>::New();
>
>   // Setup a visualization pipeline
>
>   vtkSmartPointer<vtkPlane> plane =
>       vtkSmartPointer<vtkPlane>::New();
>   vtkSmartPointer<vtkClipPolyData> clipper =
>       vtkSmartPointer<vtkClipPolyData>::New();
>   clipper->SetClipFunction(plane);
>   clipper->InsideOutOn();
>   if (argc < 2)
>   {
>     clipper->SetInputConnection(sphereSource->GetOutputPort());
>   }
>   else
>   {
>     reader->SetFileName(argv[1]);
>     clipper->SetInputConnection(reader->GetOutputPort());
>   }
>   //Create a mapper and actor
>   vtkSmartPointer<vtkPolyDataMapper> mapper =
>       vtkSmartPointer<vtkPolyDataMapper>::New();
>   mapper->SetInputConnection(clipper->GetOutputPort());
>   vtkSmartPointer<vtkActor> actor =
>       vtkSmartPointer<vtkActor>::New();
>   actor->SetMapper(mapper);
>
>   vtkSmartPointer<vtkProperty> backFaces =
>       vtkSmartPointer<vtkProperty>::New();
>   backFaces->SetDiffuseColor(.8, .8, .4);
>
>   actor->SetBackfaceProperty(backFaces);
>   // a renderer and render window
>   vtkSmartPointer<vtkRenderer> renderer =
>       vtkSmartPointer<vtkRenderer>::New();
>   vtkSmartPointer<vtkRenderWindow> renderWindow =
>       vtkSmartPointer<vtkRenderWindow>::New();
>   renderWindow->AddRenderer(renderer);
>   renderer->AddActor(actor);
>   // an interactor
>   vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>       vtkSmartPointer<vtkRenderWindowInteractor>::New();
>   renderWindowInteractor->SetRenderWindow(renderWindow);
>   renderWindow->Render();
>
>   // The callback will do the work
>   vtkSmartPointer<vtkIPWCallback> myCallback =
>       vtkSmartPointer<vtkIPWCallback>::New();
>   myCallback->SetPlane(plane);
>   vtkSmartPointer<vtkTextActor> textActor =
>       vtkSmartPointer<vtkTextActor>::New();
>   textActor->SetInput ( "Hello world" );
>   textActor->GetTextProperty()->SetColor ( 1.0,0.0,0.0 );
>   myCallback->SetTextActor(textActor);
>   renderer->AddActor2D ( textActor );
>
>   vtkSmartPointer<vtkImplicitPlaneRepresentation> rep =
>       vtkSmartPointer<vtkImplicitPlaneRepresentation>::New();
>   rep->SetPlaceFactor(1.25); // This must be set prior to placing the 
> widget
>   rep->PlaceWidget(actor->GetBounds());
>   rep->SetNormal(plane->GetNormal());
>   rep->SetOrigin(0,0,50);
>   vtkSmartPointer<vtkImplicitPlaneWidget2> planeWidget =
>       vtkSmartPointer<vtkImplicitPlaneWidget2>::New();
>   planeWidget->SetInteractor(renderWindowInteractor);
>   planeWidget->SetRepresentation(rep);
>   planeWidget->AddObserver(vtkCommand::InteractionEvent,myCallback);
>
>   // render an image (lights and cameras are created automatically)
>   renderWindowInteractor->Initialize();
>   renderWindow->Render();
>   planeWidget->On();
>   // begin mouse interaction
>   renderWindowInteractor->Start();
>   return EXIT_SUCCESS;;
> }
>
> Thanks,
>
> David
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