CGAL users discussion list

[Mahmood NT <>]

>There is a global function left_vertex_2(Polygon_2)
>and a member function Polygon_2::left_vertex

sorry but I didn't understand...
you mean:
        xMin = left_vertex_2( pgn );  ??
or:
      xMin = pgn.left_vertex();   ??

for the first I get:
VVc_demo.cpp: In function `bool read_polygons(const char*, Polygons_list_2&, 
   Bbox_2&)':
VVc_demo.cpp:623: error: no matching function for call to `left_vertex_2(
   Rat_polygon_2&)'

and for the latter I get:
VVc_demo.cpp: In function `bool read_polygons(const char*, Polygons_list_2&, 
   Bbox_2&)':
VVc_demo.cpp:623: error: cannot convert `
   
__gnu_cxx::__normal_iterator<CGAL::Point_2<CGAL::Simple_cartesian<Rational> 
   >*, std::vector<CGAL::Point_2<CGAL::Simple_cartesian<Rational> >, 
   std::allocator<CGAL::Point_2<CGAL::Simple_cartesian<Rational> > > > >' to `


I forgot to say that pgn is defined like this:
    typedef VVc_diagram_2::Rat_polygon_2                Rat_polygon_2;
    Rat_polygon_2                                                     pgn 
(vertices.begin(), vertices.end());

and in VVc_diagram_2 class I have:
    typedef Partial_polygon_Voronoi_diagram_2<Traits_2>                
Partial_pvd_2;
    typedef typename Partial_pvd_2::Rat_polygon_2                         
Rat_polygon_2;


and in Partial_polygon_Voronoi_diagram_2 class I have:
    typedef Traits_                                            Traits_2;
    typedef typename Traits_2::Rat_kernel          Rat_kernel;
    typedef Polygon_2<Rat_kernel>                   Rat_polygon_2;


So what should I do?
Mahmood NT




----- Original Message ----
From: Andreas Fabri 
<>
To: 

Sent: Saturday, December 22, 2007 4:05:57 PM
Subject: Re: [cgal-discuss] "left_vertex_2" undeclared... error


There is a global function left_vertex_2(Polygon_2)
and a member function Polygon_2::left_vertex



Mahmood NT wrote:
> Hello,
> I have wrote a code using polygon:
> 
>    if (! pgn.is_simple())
> 
>    {
> 
>      std::cerr << "Error - Polygon no. " << i + 1
> 
>                << " is not simple." << std::endl;
> 
>      return (false);
> 
>    }
> 
>    // for first polygon (domain) we have to extract boundary point 
>    // so that generated random milestones have to fit in domain
>    if ( domainFlag ) {
> 
>        xMin = pgn.left_vertex_2();
>        xMax = pgn.right_vertex_2();
>        yMin = pgn.bottom_vertex_2();
>        yMax = pgn.top_vertex_2();
>        if (fout.is_open()) {
>            fout << xMin << xMax << yMin << yMax;
> 
>          }
>        domainFlag = false;        // for other polygons, we do not need it
>    }
> 
> 
> during the compilation there is no error at "pgn.is_simple()", but at 
> "left_vertex_2()" and others it says:
> VVc_demo.cpp: In function `bool read_polygons(const char*, Polygons_list_2&,
>    Bbox_2&)':
> VVc_demo.cpp:671: error: `left_vertex_2' undeclared (first use this 
> function)
> VVc_demo.cpp:671: error: (Each undeclared identifier is reported only once 
> for
>    each function it appears in.)
> VVc_demo.cpp:672: error: `right_vertex_2' undeclared (first use this 
> function)
> VVc_demo.cpp:673: error: `bottom_vertex_2' undeclared (first use this 
> function)
> VVc_demo.cpp:674: error: `top_vertex_2' undeclared (first use this function)
> 
> Why is_simple() does not have problem but others have??
> 
> Thanks, Mahmood NT
> 
> 
> 
> 
> 
> 
>      
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