[vtkusers] Region of Interest

[Javier González González-Zabaleta]

Hi, my name´s Javier González. I'm trying to select one o more regions into
an 2D image to make some operations with their pixels. Now I'm using the
contour widget, but I don't know how put the imagen and obtain the
information.

My firt code is

vtkMFCWindow *pvtkMFCWindow;
    vtkRenderer *pvtkRenderer;
    vtkActor2D *pvtkActor2D;
    vtkTextMapper *pvtkTextMapper;
    vtkImageMapper *pvtkImageMapper;
    ConnectorType::Pointer connector;

this->connector->SetInput( InputImage );
    this->connector->Update();
    this->pvtkImageMapper->SetInput(this->connector->GetOutput());
    this->pvtkImageMapper->SetColorWindow(1000);
    this->pvtkImageMapper->SetColorLevel(500);
    this->pvtkActor2D->SetPosition(this->coorX,this->coorY);
    this->pvtkActor2D->SetMapper(this->pvtkImageMapper);
    this->pvtkRenderer->AddActor(this->pvtkActor2D);
    this->pvtkRenderer->ResetCamera();

this->pvtkMFCWindow = new vtkMFCWindow(nID);
    this->pvtkMFCWindow->GetRenderWindow()->AddRenderer(this->pvtkRenderer);

    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow( this->pvtkMFCWindow->GetRenderWindow() );

    vtkContourWidget *contourWidget = vtkContourWidget::New();
    contourWidget->SetInteractor( iren );

    vtkOrientedGlyphContourRepresentation *rep =
vtkOrientedGlyphContourRepresentation::New();
    contourWidget->SetRepresentation( rep );
    rep->GetLinesProperty()->SetColor(1, 0.2, 0);
    rep->GetProperty()->SetColor(0, 0.2, 1);
    rep->GetLinesProperty()->SetLineWidth( 3 );

    contourWidget->On();

    vtkPolyData * pd = vtkPolyData::New();

    vtkPoints    *points      = vtkPoints::New();
    vtkCellArray *lines       = vtkCellArray::New();
    vtkIdType    *lineIndices = new vtkIdType[21];
    for (int i = 0; i< 20; i++)
        {
        const double angle = 2.0*vtkMath::Pi()*i/20.0;
        points->InsertPoint(static_cast<vtkIdType>(i), 0.1*cos(angle),
                            0.1*sin(angle), 0.0 );
        lineIndices[i] = static_cast<vtkIdType>(i);
        }

    lineIndices[20] = 0;
    lines->InsertNextCell(21,lineIndices);
    delete [] lineIndices;
    pd->SetPoints(points);
    pd->SetLines(lines);
    points->Delete();
    lines->Delete();

    contourWidget->Initialize(pd);
    contourWidget->Render();

    this->pvtkRenderer->SetBackground(1.0,1.0,1.0);
    this->pvtkRenderer->AddActor(this->pvtkActor2D);
    this->pvtkRenderer->ResetCamera();

    this->pvtkMFCWindow->GetRenderWindow()->Render();

    iren->Initialize();

If I charge the image I lose the contour and I don't know how obtain the
information of the pixel into the contour.

I'm in the rigth way o should I change the method? Is there ahother widget
better to this operation?

Thanks
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