[Boost-bugs] [Boost C++ Libraries] #12663: geometry::equals fails when points differ by small value

Subject: [Boost-bugs] [Boost C++ Libraries] #12663: geometry::equals fails when points differ by small value
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-12-08 20:21:07

#12663: geometry::equals fails when points differ by small value
------------------------------+---------------------------
 Reporter:  anonymous         |      Owner:  barendgehrels
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  geometry
  Version:  Boost 1.61.0      |   Severity:  Problem
 Keywords:  equals            |
------------------------------+---------------------------
 It seems the geometry::equals function is very strict when dealing w/
 floating point precision.  I have 2 polygons that are the same except for
 one point (15.0, 10.0) vs (14.9999999999, 10.0), but geometry::equals
 returns false.  I don't know if this is a bug or the expected behavior.
 What is the tolerance and is there a way to specify it?

 bg_polygon  polygon1;
 boost::geometry::read_wkt("POLYGON((10.0 10.0,  10.0 20.0, 15.0 20.0,
 14.9999999999 10.0, 10.0 10.0))", polygon1);

 bg_polygon  polygon2;
 boost::geometry::read_wkt("POLYGON((10.0 10.0,  10.0 20.0, 15.0 20.0, 15.0
 10.0, 10.0 10.0))", polygon2);

 boost::geometry::equals(polygon1, polygon2);  --> returns false

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12663>
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