Hi Ticker, sounds great. Please can you add some unit tests to show what it does with holes, points on the split line and one or more line segments on the split line? Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Samstag, 7. Januar 2017 18:36:31 An: mkgmap development Betreff: [mkgmap-dev] New code for splitting polygon Hi Gerd I've written some new code for splitting polygons in an efficient manner. The main interface takes a shape and line of latitude or longitude and returns 2 lists of shapes on either side of the line. There is also a function to clip to rectangle. I've put the code in util/ShapeSplitter but it could go elsewhere if you prefer. So far I've only converted build/MapArea to use it, but I think it can be used throughout eventually. For the moment I've commented out the old code in MapArea, but this can be deleted in a while. Regards Ticker