[vtkusers] interaction problem

[Rashid Tanweer]

Hi, 
There can be number of solutions for such problem an inefficient one will be to 
have the main QT window as a pointer in this class which is initialized at the 
time the interactor is set and then you can call a QT function which can 
initiate a qt Singnal. Also there is something called void * user_data (last 
argument in the Execute function, you can set the user data as the pointer to 
the QT window. i hope this helps. 


Regards,
Rashid 




________________________________
From: G G <greenlander1986 at gmail.com>
To: Rashid Tanweer <quantum_cook at yahoo.com>
Cc: vtkusers at vtk.org
Sent: Mon, April 25, 2011 9:49:13 PM
Subject: Re: [vtkusers] interaction problem

I have something like this...

void ImageInteraction::Execute(vtkObject *, unsigned long event, void *)
{
    vtkRenderWindowInteractor *interactor = this->GetInteractor();

    int lastPos[2];
    interactor->GetLastEventPosition(lastPos);
    int currPos[2];
    interactor->GetEventPosition(currPos);
    
    if (event == vtkCommand::LeftButtonPressEvent)
      {
      this->Slicing = 1;

       // Pick at the mouse location provided by the interactor
       this->Picker->Pick(interactor->GetEventPosition()[0],
                   interactor->GetEventPosition()[1],
                   interactor->GetEventPosition()[2], this->Renderer);

       double pos[3];
       this->Picker->GetPickPosition(pos);



    // There could be other props assigned to this picker, so 
    // make sure we picked the image actor
    vtkAssemblyPath* path = this->Picker->GetPath();
    bool validPick = false;
 
    if (path)
      {
      vtkCollectionSimpleIterator sit;
      path->InitTraversal(sit);
      vtkAssemblyNode *node;
      for (int i = 0; i < path->GetNumberOfItems() && !validPick; ++i)
        {
        node = path->GetNextNode(sit);
        if (this->Actor == vtkImageActor::SafeDownCast(node->GetViewProp()))
          {
          validPick = true; 
          break;
          }
        }
      }
 
    if (!validPick)
      {
      return;
      }
      }
    else if (event == vtkCommand::LeftButtonReleaseEvent)
      {
      this->Slicing = 0;
      }
    else if (event == vtkCommand::MouseMoveEvent)
      {
      if (this->Slicing)
        { // something
        }
      else
        {
        vtkInteractorStyle *style = 
vtkInteractorStyle::SafeDownCast(interactor->GetInteractorStyle());
        if (style)
          {
          style->OnMouseMove();
          }
        }
      }
}

And I would like to get array pos to my GUI QT. I dont know, how to emit signal 
from this class/method or "return" value to GUI class
Thanks for all answers.



2011/4/25 G G <greenlander1986 at gmail.com>

Do you have some example? or example on the internet, please. I am trying 
something all afternoon but any solution :(
>
>
>2011/4/25 Rashid Tanweer <quantum_cook at yahoo.com>
>
>Hi, 
>>QT and VTK events are different and are generated through seperate pipelines. 
>>Best way is to have them both catch, vtk events in vtkCommand Callback by 
>>registering it through interactor and QT Event by registering a proper slot for 
>>it. 
>>
>>
>>Regards,
>>Rashid 
>>
>>
>>
>>
________________________________
 From: G G <greenlander1986 at gmail.com>
>>To: vtkusers at vtk.org
>>Sent: Mon, April 25, 2011 1:30:35 AM
>>Subject: [vtkusers] interaction  problem
>>
>>
>>Hi, could someone help me, how to connect this code
>>http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/ImageProcessing/Cxx/ImageSlicing.cxx
>>
>>with 
>>vtkEventQtSlotConnect
>>?
>>A dont know how to connect it :( 
>>Thanks a lot
>>
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