[vtkusers] Draw a 2D line?

[chasank]

Use the following code block;

    vtkPoints *points = vtkPoints::New();
    points->SetNumberOfPoints(2);
    points->Allocate(2);

    points->InsertPoint(0, x_0, y_0, z_0);
    points->InsertPoint(1, x_1, y_1, z_1);

    vtkCellArray *cells = vtkCellArray::New();
    cells->Initialize();

    vtkLine *line = vtkLine::New();
    line->GetPointIds()->SetId(0, 0);
    line->GetPointIds()->SetId(1, 1);

    cells->InsertNextCell(line);

    vtkPolyData *poly = vtkPolyData::New();
    poly->Initialize();
    poly->SetPoints(points);
    poly->SetLines(cells);
    poly->Modified();

    vtkCoordinate *coordinate = vtkCoordinate::New();
    coordinate->SetCoordinateSystemToWorld();

    vtkPolyDataMapper2D *mapper = vtkPolyDataMapper2D::New();
    mapper->SetInputData(poly);
    mapper->SetTransformCoordinate(coordinate);
    mapper->ScalarVisibilityOn();
    mapper->SetScalarModeToUsePointData();
    mapper->Update();

    vtkActor2D *actor = vtkActor2D::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetLineWidth(2.0); // Line Width

    vtkRenderer *renderer = vtkRenderer::New();
    renderer->AddViewProp(this->distanceActor);



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