CGAL users discussion list

[Andreas Fabri <>]

Mahmood NT wrote:
> Hi,
> I have the following definitions for a polygon.
> typedef Traits_                                         Traits_2;
>
>  typedef typename Traits_2::Rat_kernel      Rat_kernel;
>
> typedef typename Rat_kernel::Point_2       Rat_point_2;
> typedef Polygon_2<Rat_kernel>                Rat_polygon_2;
> std::list<Rat_point_2>                              vertices;
>
> In a loop I will push back the points like this:
> vertices.push_back (Rat_point_2 (x, y));
>
> Then I define polygon:
> Rat_polygon_2        pgn (vertices.begin(), vertices.end());
>
> Now, when I want to use "CGAL::bounded_side_2" I get compilation error:
> CGAL::bounded_side_2( vertices.begin(), vertices.end(), Rat_point_2 (1, 2), 
> Rat_point_2() );


The fourth argument should be the kernel and not another point

CGAL::bounded_side_2( vertices.begin(), vertices.end(), Rat_point_2 (1, 2), 
Rat_kernel() );

andreas

> Why?  I have to say, I use CGAL 3.2. Does it matter?
> I am looking for something like: "CGAL::bounded_side_2( pgn, Rat_point_2 (1, 2) 
> );" Is it possible?
>
> the error message is:
> include/CGAL/Polygon_2_algorithms.C: In function `CGAL::Bounded_side 
>    CGAL::bounded_side_2(ForwardIterator, ForwardIterator, const Point&, const Traits&) [with ForwardIterator =
>    std::_List_iterator<CGAL::Point_2<CGAL::Simple_cartesian<Rational> >, 
>    CGAL::Point_2<CGAL::Simple_cartesian<Rational> >&, CGAL::Point_2<CGAL::Simple_cartesian<Rational>
>    >*>, Point = Rat_point_2, Traits = Rat_point_2]':
>
> VVc_demo.cpp:607:   instantiated from here
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:300: error: no type
>    named `Compare_x_2' in `class Rat_point_2'
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:301: error: no type
>    named `Compare_y_2' in `class Rat_point_2'
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:302: error: no type
>    named `Orientation_2' in `class Rat_point_2'
> VVc_demo.cpp:607:   instantiated from here
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:304: error: `
>    compare_y_2' undeclared (first use this function)
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:304: error: (Each
>    undeclared identifier is reported only once for each function it appears
>    in.)
> .../CGAL-3.2/include/CGAL/Polygon_2_algorithms.C:317: error: `
>    compare_x_2' undeclared (first use this function)
>
>
> Thanks,
>
> Mahmood NT
>
>
>
>
>
>
>       
> ____________________________________________________________________________________
> Be a better pen pal. 
> Text or chat with friends inside Yahoo! Mail. See how.  http://overview.mail.yahoo.com/