CGAL users discussion list

[Andreas Fabri <>]

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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