[Qgis-user] centroid

[G. Allegri]

>  is there any autocomplete
> for a line to create polygons from lines to adjacent polygon.

In GRASS you can use:

# v.type in=input_lines out=output_boundary type=line,boundary

and then add centroids to the created boundaries with something like
(I'm going with memory, you should check the command syntax):

# v.centroids input=output_boundary output=output_polygon option=add

Obviously you have to check the topology results at then end. It's up
to you to have a consitent starting line vector (closed arcs, islands,
etc.), otherwise you will have to correct it with the usual commands
(v.clean, vlbuild, etc.)