Subject: CGAL users discussion list
List archive
- From: Graviton <>
- To:
- Subject: [cgal-discuss] Bug with do_intersect?
- Date: Tue, 13 Nov 2012 19:11:21 -0800 (PST)
I think that there is a bug with the method do_intersect.
Test this sample:
/*! \file do_intersect.cpp
* Determining whether two triangles intersect.
*/
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Boolean_set_operations_2.h>
typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef Kernel::Point_2 Point_2;
typedef CGAL::Polygon_2<Kernel> Polygon_2;
#include "print_utils.h"
int main ()
{
Polygon_2 P;
//P.push_back (Point_2 (-1,1));
//P.push_back (Point_2 (0,-1));
//P.push_back (Point_2 (1,1));
P.push_back (Point_2 (13371696.6813195, -23135667.773556));
P.push_back (Point_2 (13368240.604, -23133412.8));
P.push_back (Point_2 (13364140.624, -23133192.28));
P.push_back (Point_2 (13368823.9405681, -23134726.6078103));
std::cout << "P = "; print_polygon (P);
Polygon_2 Q;
//Q.push_back(Point_2 (-1,-1));
//Q.push_back(Point_2 (1,-1));
//Q.push_back(Point_2 (0,1));
Q.push_back(Point_2 (13375139.672, -23136795.756));
Q.push_back(Point_2 (13371696.6813195, -23135667.773556));
Q.push_back(Point_2 (13371696.682, -23135667.774));
Q.push_back(Point_2 (13368823.9405681, -23134726.6078103));
Q.push_back(Point_2 (13298835.453, -23111797.193));
Q.push_back(Point_2 (13374018.867, -23140216.837));
std::cout << "Q = "; print_polygon (Q);
if ((CGAL::do_intersect (P, Q)))
std::cout << "The two polygons intersect in their interior." <<
std::endl;
else
std::cout << "The two polygons do not intersect." << std::endl;
return 0;
}
If you notice carefully, the P and Q are not intersecting each other ( two
points of P and Q are the same, and the other two points of P are located on
the RHS of Q).
But from the above program, the CGAL:do_intersect returns a true. It should
return a false.
--
View this message in context:
http://cgal-discuss.949826.n4.nabble.com/Bug-with-do-intersect-tp4656236.html
Sent from the cgal-discuss mailing list archive at Nabble.com.
- [cgal-discuss] Bug with do_intersect?, Graviton, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Ophir Setter, 11/14/2012
- [cgal-discuss] Re: Bug with do_intersect?, goshhukha, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Stefan Schirra, 11/14/2012
- [cgal-discuss] Re: Bug with do_intersect?, goshhukha, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Ophir Setter, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Stefan Schirra, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Efi Fogel, 11/15/2012
- Re: [cgal-discuss] Bug with do_intersect?, Stefan Schirra, 11/14/2012
- [cgal-discuss] Re: Bug with do_intersect?, goshhukha, 11/14/2012
- Re: [cgal-discuss] Bug with do_intersect?, Ophir Setter, 11/14/2012
Archive powered by MHonArc 2.6.18.