Tuesday, 29 March 2016

geos - How to determine if two points are on the same side of a LineString?



I have two points, A and B, and a line string L. A line string is formed by a sequence of points such that consecutive points are joined by a straight line. This is the same as a LineString in Geos - I don't know if CGAL has an equivalent construct.


My question is - what is the most efficient way to determine if A and B lie on the same or different side of the polyline L? I would ideally like to use the Geos::geom library, since my data is in that form, but a CGAL solution would also work.




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