CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

You mixed up declaration from  two different packages.

Have a look here for example:

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Straight_skeleton_2/Chapter_main.html#Subsection_23.3.4

Sebastien.

On 02/23/2012 11:11 PM, J_Young wrote:
> But I got compiling error when I try to pass in a General_polygon_2 object.
>
> 1>------ Build started: Project: TestApp1, Configuration: Release Win32
> ------
> 1>   TestApp1.cpp
> 1>C:\Program Files\CGAL-3.9\include\CGAL/create_offset_polygons_2.h(304):
> error C2039: 'Traits' : is not a member of
> 'CGAL::General_polygon_2<Arr_traits>'
> 1>           with
> 1>           [
> 1>               Arr_traits=CGAL::Arr_circle_segment_traits_2<Kernel,true>
> 1>           ]
> 1>           TestApp1.cpp(122) : see reference to function template
> instantiation 'std::vector<_Ty,_Ax>
> CGAL::create_interior_skeleton_and_offset_polygons_2<int,Polygon_2>(const FT
> &,const Polygon&)' being compiled
> 1>           with
> 1>           [
> 1>               _Ty=boost::shared_ptr<Polygon_2>,
> 1>               _Ax=std::allocator<boost::shared_ptr&lt;Polygon_2>>,
> 1>               FT=int,
> 1>               Polygon=Polygon_2
> 1>           ]
> 1>C:\Program Files\CGAL-3.9\include\CGAL/create_offset_polygons_2.h(304):
> error C3861: 'Traits': identifier not found
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
>
>
> Below is the code snippet.
>
> #include<CGAL/Exact_predicates_exact_constructions_kernel.h>
> #include<CGAL/Gps_circle_segment_traits_2.h>
> #include<CGAL/create_offset_polygons_2.h>
>
> typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
> typedef Kernel::Point_2                                   Point_2;
> typedef CGAL::Gps_circle_segment_traits_2<Kernel>          Traits_2;
> typedef Traits_2::General_polygon_2                       Polygon_2;
> typedef Traits_2::General_polygon_with_holes_2
> Polygon_with_holes_2;
> typedef Traits_2::X_monotone_curve_2
> X_monotone_curve_2;
>
> Polygon_2 construct_polygon (const Point_2&  p1, const Point_2&  p2,
>                               const Point_2&  p3, const Point_2&  p4)
> {
>    Polygon_2 pgn;
>    X_monotone_curve_2 s1(p1, p2);    pgn.push_back(s1);
>    X_monotone_curve_2 s2(p2, p3);    pgn.push_back(s2);
>    X_monotone_curve_2 s3(p3, p4);    pgn.push_back(s3);
>    X_monotone_curve_2 s4(p4, p1);    pgn.push_back(s4);
>    return pgn;
> }
>
> int main()
> {
>         Polygon_2 rect1;
>         rect1 = construct_polygon(Point_2(1, 0), Point_2(5, 0),
>                                                         Point_2(5, 2), 
> Point_2(1, 2));
>
>         CGAL::create_interior_skeleton_and_offset_polygons_2(1, rect1);
>         return 0;
> }
>
>
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/How-to-offset-inset-a-general-polygon-by-a-certain-values-tp4414852p4415432.html
> Sent from the cgal-discuss mailing list archive at Nabble.com.