[vtkusers] Emulate vtkIdFilter

[Gheorghe Postelnicu]

Hi Mathieu,

Thanks for the quick reply! Looking at vtkIdFilter, here's the
solution that worked for me.

# declare points where to set labels
    vtkPoints pts

# populate pts object with data
    vtkPolyData pdata
    [line2 GetRepresentation] GetPolyData pdata
    eval pts InsertNextPoint [pdata GetPoint 0]

# populate label array data -> 1-2-1 corr. with added points
# need an array to hold it....
    vtkIntArray lblArray
    lblArray InsertNextValue 1

    vtkPointData labels
    labels AddArray lblArray

# final polydata object
    vtkPolyData newData
    newData SetPoints pts
    newData SetFieldData labels

    vtkLabeledDataMapper ldm
    ldm SetInput newData
    ldm SetLabelFormat "%g"

    vtkActor2D pointLabels
    pointLabels SetMapper ldm

    ren1 AddActor2D pointLabels
    renWin Render

On 8/3/06, Mathieu Malaterre <mathieu.malaterre at kitware.com> wrote:
> Gheorghe Postelnicu wrote:
> > Hi,
> >
> > I have a collection 3d points and some labels. What is the most
> > natural way to display the labels as a 2d actor?
>
> Hi Gheorghe,
>
>         Have a look at:
> http://www.vtk.org/doc/nightly/html/classvtkLabeledDataMapper.html
>
>         There are a couple of tests/examples that shows you how to use it. You
> may also want to have a look at vtkSelectVisiblePoints.
>
> HTH
> Mathieu
>


-- 
Gheorghe Postelnicu, PhD
MGH, Harvard Medical School