[GRASSLIST:303] distance to raster line

[Thomas Hoffmann]

Hi,
once again. I do have a line raster map (e.g. a raster map of roads), 
and I need to generate a raster layer, where every pixel has the same ID 
as the closest line (of the line raster). I am not sure if a combination 
of the r.cost and r.drain commands can help. At least I dont see how to 
do it.

Does anybody have an idea.
Thanks
Thomas H.