[vtkusers] Integrating Qt (Carsten Kuebler) and VTK

[Erica Sullivan]

I am using Carsten Kuebler's package to integrate Qt (v3.2) w/ VTK (v4.2).  
I know that the following line has to be included in the main function - 
vtkQtObjectFactory::RegisterObjectFactory().  Is it possible, though, to 
include the pipeline in another function?  I have included main.cpp and the 
function in MainGUI.cpp that contains the pipeline.

If I comment out all of Kuebler's code in the function, the pipeline works 
correctly (i.e. a vtkImage Viewer object is created that displays the file 
selected).  If I try to use Kuebler's code nothing happens after I select 
the file to open.  I am guessing that this has something to do with the fact 
that the pipeline is in a seperate function from RegisterObjectFactory.

Thanks, Erica

#include <qapplication.h>
#include <vtkQtObjectFactory.h>
#include "MainGUI.h"

int main(int argc, char *argv[])
{
	vtkQtObjectFactory::RegisterObjectFactory();

	QApplication app(argc, argv);

                //Basics for the QT-Event loop
	app.setMainWidget(dialog);
	dialog->show();
	return app.exec();

	return 0;
}

This is the function call in MainGUI.cpp.  This function is tied to the slot 
for a QtPushButton.

void MainGUI::open()
{
	QString fileFilters = tr("JPEG (*.jpg)\n" "Bitmap (*.bmp)\n" "GIF 
(*.gif)\n" "TIFF (*.tif)\n" "PNG (*.png)" );
	filename = QFileDialog:: getOpenFileName(".", fileFilters, this);

	typedef unsigned char PixelType;
	const unsigned int Dimension = 2;
	typedef itk::Image< PixelType, Dimension > ImageType;
	typedef itk::ImageFileReader< ImageType > ReaderType;
	typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;

	ReaderType::Pointer reader = ReaderType::New();
	ConnectorType::Pointer connector = ConnectorType::New();

	reader->SetFileName((const char*)filename);
	connector->SetInput(reader->GetOutput());

	vtkImageViewer *viewer = vtkImageViewer::New();
	vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
	viewer->SetupInteractor(iren);
	viewer->SetInput(connector->GetOutput());
	viewer->SetColorWindow(255);
	viewer->SetColorLevel(128);

	vtkQtObjectFactory::SetQtBase(filSV->viewport(), NULL);
	viewer->GetRenderWindow()->Start();

	QWidget *tmpWidget = 
vtkQtObjectFactory::QtWidget(viewer->GetRenderWindow());

    if (tmpWidget != NULL)
    {
        // Works as well without the vtkqt object factory support
        filSV->addChild(tmpWidget);
    }


	viewer->GetRenderWindow()->SetSize(512,512);

	//This starts the event loop and as a side effect causes an initial render.
    if (tmpWidget == NULL)
	{
		viewer->Render();

		iren->Start();
	}

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