[vtkusers] ImageSlicing Example of vtkImageReslice

[Saira Saleem Pathan]

hi 
My question is ImageSlicing Example:
In the following snipit of code, if i want to see the slice index and then provide that slice index to vtkImagePlaneWidget.
Can u please explain this?

else if (event == vtkCommand::MouseMoveEvent)
      {
      if (this->Slicing)
        {
        vtkImageReslice *reslice = this->ImageReslice;

        // Increment slice position by deltaY of mouse
        int deltaY = lastPos[1] - currPos[1];

        reslice->GetOutput()->UpdateInformation();
        double sliceSpacing = reslice->GetOutput()->GetSpacing()[2];
        vtkMatrix4x4 *matrix = reslice->GetResliceAxes();	
        // move the center point that we are slicing through
        double point[4];
        double center[4];
        point[0] = 0.0;
        point[1] = 0.0;
        point[2] = sliceSpacing * deltaY;
        point[3] = 1.0;
        matrix->MultiplyPoint(point, center);
        matrix->SetElement(0, 3, center[0]);
        matrix->SetElement(1, 3, center[1]);
        matrix->SetElement(2, 3, center[2]);
        interactor->Render();
        }
_________________________________________________________________
News, entertainment and everything you care about at Live.com. Get it now!
http://www.live.com/getstarted.aspx