[vtkusers] Progress event with vtkMetaImageReader

[Wang Zhimin]

Hi, VTKers,

I am looking for a sample code to create a callback function to interact with QT's progress bar. In ITK, I usually do it in this way.

// The call back function
class ShowProgressObject
{
public:
    ShowProgressObject()
        {
            m_Process = NULL;
            m_progressBar = NULL;
            m_accumulatedProgress = 0;
            m_proportion = 1;
        }
    void SetProcessObject( itk::ProcessObject* o ) { m_Process = o; }
    void SetProgressBar( QProgressBar* p ) { m_progressBar = p; }
    void SetAccumulatedProgress( double ap ) { m_accumulatedProgress = ap; }
    void SetProportion( double p ) { m_proportion = p; }
    void ShowProgress()
        {
            if( m_progressBar )
            {
                m_progressBar->setValue( m_accumulatedProgress + m_Process->GetProgress() * 100 * m_proportion );
                qApp->processEvents();
            }
        }
    itk::ProcessObject::Pointer m_Process;
    QProgressBar* m_progressBar;
    double m_accumulatedProgress;
    double m_proportion;
};

// register it with itk filter/io
itk::SimpleMemberCommand<ShowProgressObject>::Pointer command;
    command = itk::SimpleMemberCommand<ShowProgressObject>::New();
	command->SetCallbackFunction(&progress,
                                 &ShowProgressObject::ShowProgress);
	
	itkMetaImageReader->SetFileName( inputFileName.c_str() );
	itkMetaImageReader->AddObserver( itk::ProgressEvent(), command );
    itkMetaImageReader->Update();

May I know how I can implement the above similarly with vtkMetaImageReader in VTK+QT application?

Thank you very much.

Zhimin WANG, Ph.D.
Institute for Infocomm Research 
A-STAR, Singapore
 

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