[Boost-bugs] [Boost C++ Libraries] #13014: buffer returns invalid geometries when used with asymmetric distances on the same side

Subject: [Boost-bugs] [Boost C++ Libraries] #13014: buffer returns invalid geometries when used with asymmetric distances on the same side
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-05-08 09:20:46

#13014: buffer returns invalid geometries when used with asymmetric distances on
the same side
------------------------------+---------------------------
 Reporter:  andre.meyer@…     |      Owner:  barendgehrels
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  geometry
  Version:  Boost 1.62.0      |   Severity:  Problem
 Keywords:                    |
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 Using buffer with distances (2/-1) or (-1/2) should generate a polygon
 that lies beside the original linestring.

 But, since the direction is only determined for both sides (in
 buffer_inserter, checking negative() for the distance strategy, which
 returns only true if both sides are negative), the inner of both sides is
 calculated wrong.

 Maybe buffer_inserter could check nageative() for each side separately,
 and only reverse one side before stitching both sides together?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/13014>
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