CGAL users discussion list

[Efi Fogel <>]

You can use your own observer (derived from
CGAL::Arr_observer<Arrangement_2>). Look at face_extension.cpp to see
how it's done for faces.

Wang Weiwei wrote:

>Hi all,
>
>I'm using the Arrangement_2 module of CGAL.
>
>I want to attach some user information to the vertices of the arrangement. 
>I've found some example code in the example folder of the CGAL lib (such as
>ex_dcel_extension.C). 
>
>Unfortunately, in this example, the user data are attached to the vertices, 
>halfedges and faces after the arrangement was built. What I want to know is 
>how I can attach these user data to the vertices during the construction of 
>the arrangement. For those vertices newly created during the intersection of 
>the curves, a pre-specified default value will be ok.
>
>Thanks in advance for any help.
>
>Sorry for the previous message with the subject not correct.
>
>Max
>  
>
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