CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 02/28/2012 08:39 PM, J_Young wrote:
> Sebastien,
>
> Yes, the outputs in the example are General_polygon_2, but not the input.
You are right, I parsed the example too fast. Now I remember your
problem is an on-going work at TAU.
In the meantime, something that might work in your case is to
approximate circular arcs by segments (then you'll have a Polygon).

Sebastien.

> I tried the following, but I don't know how to add an arc to the polygon.
>
> #include <CGAL/Exact_circular_kernel_2.h>
> #include <CGAL/approximated_offset_2.h>
>
> typedef CGAL::Exact_circular_kernel_2 Kernel;
> typedef CGAL::Polygon_2<Kernel> Polygon_2;
>
> typedef CGAL::Gps_circle_segment_traits_2<Kernel> Gps_traits_2;
> typedef Gps_traits_2::Polygon_2 Offset_polygon_2;
> typedef Gps_traits_2::Polygon_with_holes_2 Offset_polygon_with_holes_2;
>
> void approximateInset( )
> {
> Polygon_2 P; // how to add an arc into this polygon on the circular kernel?
>
> Kernel::FT radius = 2;
> const double err_bound = 0.00001;
> std::list<Offset_polygon_2> inset_polygons;
> CGAL::approximated_inset_2(P, radius, err_bound,
> std::back_inserter(inset_polygons));
> }
>
>
> ------------------------------------------------------------------------
> *From:* Sebastien Loriot (GeometryFactory) [via cgal-discuss] <[hidden
> email] </user/SendEmail.jtp?type=node&node=4429269&i=0>>
> *To:* J_Young <[hidden email]
> </user/SendEmail.jtp?type=node&node=4429269&i=1>>
> *Sent:* Monday, February 27, 2012 11:26 PM
> *Subject:* Re: How to offset/inset a general polygon by a certain values?
>
> In the first example here:
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Minkowski_sum_2/Chapter_main.html#Subsection_24.3.3
>
> the nested type Gps_traits_2::Polygon_2 is
> General_polygon_2<Arr_circle_segment_traits_2<Kernel> >
>
> Sebastien.
>
> On 02/28/2012 12:16 AM, J_Young wrote:
>
>  > Sebastien,
>  >
>  > The examples in the following chapter does not work either.
>  >
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Minkowski_sum_2/Chapter_main.html
>  >
>  > offset_polygon_2 takes in a Polygon_2 object, not a General_polygon_2
> object
>  > which is what I need.
>  >
>  > Are there other ways?
>  >
>  > Thanks,
>  > Jay
>  >
>  > --
>  > View this message in context:
> http://cgal-discuss.949826.n4.nabble.com/How-to-offset-inset-a-general-polygon-by-a-certain-values-tp4414852p4426420.html
>  > Sent from the cgal-discuss mailing list archive at Nabble.com
> <http://Nabble.com>.
>  >
>
> --
> You are currently subscribed to cgal-discuss.
> To unsubscribe or access the archives, go to
> https://lists-sop.inria.fr/wws/info/cgal-discuss
>
>
>
> ------------------------------------------------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
> http://cgal-discuss.949826.n4.nabble.com/How-to-offset-inset-a-general-polygon-by-a-certain-values-tp4414852p4427297.html
>
> To unsubscribe from How to offset/inset a general polygon by a certain
> values?, click here.
> NAML
> <http://cgal-discuss.949826.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>
>
>
>
> ------------------------------------------------------------------------
> View this message in context: Re: How to offset/inset a general polygon
> by a certain values?
> <http://cgal-discuss.949826.n4.nabble.com/How-to-offset-inset-a-general-polygon-by-a-certain-values-tp4414852p4429269.html>
> Sent from the cgal-discuss mailing list archive
> <http://cgal-discuss.949826.n4.nabble.com/> at Nabble.com.