[Boost-bugs] [Boost C++ Libraries] #13179: geometry::covered_by and geometry::within not working for certain values

Subject: [Boost-bugs] [Boost C++ Libraries] #13179: geometry::covered_by and geometry::within not working for certain values
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-08-25 21:04:11

#13179: geometry::covered_by and geometry::within not working for certain values
------------------------------------------+----------------------------
 Reporter:  Stanley <stanley.foerster@…>  |      Owner:  Barend Gehrels
     Type:  Bugs                          |     Status:  new
Milestone:  To Be Determined              |  Component:  geometry
  Version:  Boost 1.65.0                  |   Severity:  Problem
 Keywords:                                |
------------------------------------------+----------------------------
 ''covered_by'' and ''within'' return false even if the point is obviously
 located within the polygon, as the following code demonstrates:

 {{{
 #!c++
 #include <iostream>

 #include <boost/version.hpp>

 #include <boost/geometry.hpp>
 #include <boost/geometry/geometries/point_xy.hpp>
 #include <boost/geometry/geometries/polygon.hpp>

 typedef boost::geometry::model::d2::point_xy<double> Point;
 typedef boost::geometry::model::polygon<Point> Polygon;

 int main() {
     std::cout << "Running Boost in version " << BOOST_VERSION <<
 std::endl;

     Polygon polygon;
     std::vector<Point> points;

     points.emplace_back(Point(68.3, 35.5));
     points.emplace_back(Point(68.3, 35.6));
     points.emplace_back(Point(70.3, 35.9));
     points.emplace_back(Point(70.3, 35.8));
     Point point(69.2, 35.7);

     boost::geometry::assign_points(polygon, points);

     std::cout << "Point is covered by polygon: " <<
 boost::geometry::covered_by(point, polygon) << std::endl;
     std::cout << "Point is within by polygon: " <<
 boost::geometry::within(point, polygon) << std::endl;

     return 0;
 }
 }}}

 which gives:

 {{{
 Running Boost in version 106500
 Point is covered by polygon: 0
 Point is within by polygon: 0
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13179>
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