[vtkusers] Graph vertex coloring not working

[Jeff Baumes]

You need to specify the array to color by with

  graphLayoutView->SetVertexColorArrayName("color");

The default is to color by vertex degree, which is why there were two
of each color (degree 1 and 2).

Jeff

On Tue, Mar 30, 2010 at 10:30 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
>>> I did what you said (using a vtkViewTheme) and it still seems to have
>>> the problem of 2 vertices get colored one color (red) and two another
>>> (green).
>>
>> You are close. You only set 2 table values, so all scalars will be
>> mapped to one or the other. If you add intermediate table values you
>> would be ok.
>>
>> Jeff
>>
>
> I tried using a vtkLookupTable instead:
> http://www.vtk.org/Wiki/VTK/Examples/Graphs/ColorVertices
>
> Both of these:
> http://www.vtk.org/Wiki/VTK/Examples/ColorTransferFunction
> http://www.vtk.org/Wiki/VTK/Examples/ColorLookupTable
>
> can definitely interpolate colors - why would it not work for vertex coloring?
>
> Also, I tried setting 3 low values and 1 high value:
>  vertexColors->InsertNextValue(1);
>  vertexColors->InsertNextValue(3);
>  vertexColors->InsertNextValue(2);
>  vertexColors->InsertNextValue(10);
>
> expecting to see 3 of one color and 1 of the other (if they are
> clamping like you said), but I still see 2 blue and 2 red.
>
> Thanks,
>
> David
>