[vtkusers] error when rendering treemapview in minimal example code

[David]

Hi,

I want to use the vtkTreeMapView for an infovis application I am working
on. When I compile and run the very minimal code below, I get the following
error messages during the call to view->GetRenderWindow()->Render();:

ERROR: In
C:\temp\source\VTK-6.1.0\Common\ExecutionModel\vtkDemandDrivenPipeline.cxx,
line 715
vtkCompositeDataPipeline (0000007D7D15F3A0): Input port 0 of algorithm
vtkTreeLevelsFilter(0000007D7AAD5DB0) has 0 connections but is not optional.

ERROR: In C:\temp\source\VTK-6.1.0\Common\ExecutionModel\vtkAlgorithm.cxx,
line 538
vtkPointSetToLabelHierarchy (0000007D7CF19840): Attempt to get vertex or
edge data from a non-graph


I'm not really sure what the problem is. Does somebody here know what I am
doing wrong in my minimal example? Any ideas what the problem could be that
produces these error messages?

After the call to render I get a treemap visualization, but further use of
the treemapview becomes very unstable and eventually crashes my
application. I assume this related to the problem indicated by the error
messages.

I tried playing with all kinds of things including additional vertex data
etc. without success.


Here is the minimal code which I used together with vtk6.1.0 and qt4.8.5:
#include <QApplication>
#include <vtkMutableDirectedGraph.h>
#include <vtkTree.h>
#include <QVTKWidget.h>
#include <vtkRenderWindow.h>
#include <vtkTreeMapView.h>

int main( int argc, char** argv )
{
    QApplication app(argc, argv);

    // create graph and propagate it with vertices and edges ----
    vtkMutableDirectedGraph* graph = vtkMutableDirectedGraph::New();

    // add vertices/edges
    vtkIdType rootNode = graph->AddVertex();
    vtkIdType childNode1 = graph->AddChild(rootNode);

    // convert graph to tree ----
    vtkTree* tree = vtkTree::New();

    bool result = tree->CheckedShallowCopy(graph);
    if(!result)
    {
        std::cerr << "conversion failed!\n";
        return -1;
    }

    // setup treeview and qt widget ---
    vtkTreeMapView* view = vtkTreeMapView::New();
    view->SetRepresentationFromInput(tree);
    view->GetRenderWindow()->Render();

    QVTKWidget widget;
    widget.resize(256,256);
    widget.SetRenderWindow(view->GetRenderWindow());
    widget.show();

    return app.exec();
}

Any help or hint is much appreciated. Thanks.
David
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