[vtkusers] Information during callback / vtkImplicitPlaneWidget2

[David Doria]

On Fri, Mar 12, 2010 at 7:17 AM, Sebastian Gatzka <
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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