id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6958	boost::geometry::intersection on two polygons creates self-intersecting polygon	anonymous	Barend Gehrels	"This program intersects two non-self-intersecting polygons and receives a self-intersecting polygon as output.  The expected result was a polygon that does not intersect itself.  I tested this on SVN revision 78784, and it failed with:

A
B
terminate called after throwing an instance of 'boost::geometry::overlay_invalid_input_exception'
  what():  Boost.Geometry Overlay invalid input exception
Aborted

Thanks!
Craig

{{{
#include <cstdio>
#include <vector>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/geometries/register/point.hpp>
#include <boost/geometry/geometries/register/ring.hpp>
#include <boost/geometry/io/wkt/wkt.hpp>
#include <boost/geometry/multi/geometries/multi_polygon.hpp>

typedef boost::geometry::model::d2::point_xy<double> pt;
typedef boost::geometry::model::polygon<pt> polygon;
typedef boost::geometry::model::multi_polygon<polygon> multi_polygon;

int main()
{
    polygon green, blue;
    multi_polygon output;

    boost::geometry::read_wkt(
        ""POLYGON((0.63872330997599124913 0.25963790394761232516 ,""
        "" 0.51901482278481125832 0.36860892060212790966 ,""
        "" 0.24443514109589159489 0.62663296470418572426 ,""
        "" 0.41175117865081167778 0.47178476291601745274 ,""
        "" 0.63872330997599124913 0.25963790394761232516))"", green);

    boost::geometry::read_wkt(
        ""POLYGON((0.52364358028948876367 0.36823021165656988352 ,""
        "" 0.7762673462275415659 0.13443113025277850237 ,""
        "" 0.59446187055393329146 0.29992923303868185281 ,""
        "" 0.52364358028948876367 0.36823021165656988352))"",blue);

    boost::geometry::correct(green);
    boost::geometry::correct(blue);
    boost::geometry::detail::overlay::has_self_intersections(green);
    boost::geometry::detail::overlay::has_self_intersections(blue);

    printf(""A\n"");
    boost::geometry::intersection(green,blue,output);
    printf(""B\n"");
    boost::geometry::detail::overlay::has_self_intersections(output);
    printf(""C\n"");

    return 0;
}
}}}"	Bugs	closed	Boost 1.55.0	geometry	Boost Development Trunk	Problem	fixed		snubdodecahedron@…