[vtkusers] vtkGraphToTable

[Jason BELLONE]

In case this subject is eventually interesting to anyone else, below is 
basic GraphToTable function.  (Thanks Jeff/Brian for your inputs)

vtkTable *createTableFromGraph(vtkGraph *graph)
{
        vtkTable *myTable = vtkTable::New();
        //Create a column named "NodeId"
        vtkStringArray *colNodeId = vtkStringArray::New();
        colNodeId->SetName("NodeId");
        myTable->AddColumn(colNodeId);
        //Create columns named "X", "Y" and "Z"
        vtkFloatArray *colX = vtkFloatArray::New();
        colX->SetName("X");
        myTable->AddColumn(colX);
        vtkFloatArray *colY = vtkFloatArray::New();
        colY->SetName("Y");
        myTable->AddColumn(colY);
        vtkFloatArray *colZ = vtkFloatArray::New();
        colZ->SetName("Z");
        myTable->AddColumn(colZ);

        //Fill the table with data from the graph vertices
        vtkVertexListIterator *vertices = vtkVertexListIterator::New();
        graph->GetVertices(vertices);
        double position[3] = {0.0, 0.0, 0.0};
        vtkIdType i = 0;
        while (vertices->HasNext())
        {
                vertices->Next();
                //Add the vertex ID to the "NodeId" column
                char vertexId[10];
                sprintf(vertexId, "%d",i); //Convert the vertex ID to a 
string
                colNodeId->InsertNextValue( vertexId );
                //Add the position values to columns "X", "Y" and "Z"
                graph->GetPoint(i, position);
                colX->InsertNextValue( position[0] );
                colY->InsertNextValue( position[1] );
                colZ->InsertNextValue( position[2] );
                ++i;
        }
        return myTable;
}

Cheers,

JB



From:
Jeff Baumes <jeff.baumes at kitware.com>
To:
Jason BELLONE <JBELLONE at unog.ch>
Cc:
vtkusers at vtk.org
Date:
19/04/2010 16:47
Subject:
Re: [vtkusers] vtkGraphToTable



You are right that vtkDataObjectToTable will not transfer points to
the table, because points are treated as a special array outside the
point (or vertex) data. It would be great to see a "TransferPoints"
option to vtkDataObjectToTable to take care of this case.

Jeff

On Fri, Apr 16, 2010 at 1:14 PM, Jason BELLONE <JBELLONE at unog.ch> wrote:
> Thanks Brian,
>
> I really appreciate your suggestions! Please forgive my ignorance, but 
I'm a
> bit unclear on parameterizing vtkDataObjectToTable. Using the
> 
vtkRandomGraphSource->vtkGraphLayout->vtkDataObjectToTable->vtkTableWriter
> pipeline, I get only a list of vertexIds (with SetFieldType(3)) - but no
> coordinates (posX, posY, posZ).
>
> P.S. I'm using VisTrails to simulate which doesn't have
> vtkDelimitedTextWriter
>
> For some background, the reason we're following this approach is to use 
vtk
> to produce graph data models as vtkTables. The table is used as source 
for a
> 3d game engine (OGRE) where the id, x, y, z records are used to generate
> null 3d points. Game assets are then attached to these points.
>
> Thank you very much for the assistance,
>
> JB
>
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