[Boost-bugs] [Boost C++ Libraries] #11233: User defined spatial predicate within Boost Geometry

Subject: [Boost-bugs] [Boost C++ Libraries] #11233: User defined spatial predicate within Boost Geometry
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-04-24 03:49:05

#11233: User defined spatial predicate within Boost Geometry
-----------------------------------------------+---------------------------
 Reporter:  Frank Hippmann <frank.hippmann@…>  |      Owner:  barendgehrels
     Type:  Feature Requests                   |     Status:  new
Milestone:  To Be Determined                   |  Component:  geometry
  Version:  Boost 1.56.0                       |   Severity:  Problem
 Keywords:  geometry relate                    |
-----------------------------------------------+---------------------------
 I need to determine whether the interiors of two geometries intersect. An
 InteriorsIntersect predicate is not specified by OGC or Boost Geometry but
 is defined by the DE-9IM matrix:

 {{{

 T * *
 * * *
 * * *
 }}}

 I've created my own predicate using the relate function in Boost Geometry.


 {{{
 namespace bgr = boost::geometry::detail::relate;
 using InteriorsIntersectMask =
 bgr::static_mask<'T','*','*','*','*','*','*','*','*'>;

 template<typename Geom1, typename Geom2>
 inline bool interiorsIntersect(const Geom1& geom1, const Geom2& geom2)
 {
     return bgr::relate<InteriorsIntersectMask>(geom1, geom2);
 }
 }}}

 This works great. My only concern is that the relate function and
 static_mask type are not documented as part of the Boost Geometry API and
 are implementation details as far as I can tell. Is it safe to use relate
 in this way? Is there an alternative to achieving the same goal using
 Boost Geometry? Ideally I would like to see relate be an algorithm within
 boost/geometry/algorithms.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11233>
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