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Why doesn't fTools Line to Polygon work?

Why doesn't fTools Line to Polygon work?


I am working new with QGIS (Version 2.8.2 / Window 8.2) and try to make Polygon from Line (see example picture 1) with the fTool LineToPolygon, but it doesn't work (see picture 2).

I work with complex geological maps and should make PLG from Line like in ArcGIS.


Line to polygon connects the first and the last point of each polyline. It doesn't maintain topology. To solve the task you need a GIS handling topology like GRASS.