CGAL users discussion list

[gp <>]

How would a custom OverlayTraits model do this? The OverlayTraits concept
doesn't seem to directly involve the internal curve-to-halfedge mapping
information specific to arrangements with history. The closest it offers are
the three create_edges methods invoked whenever elements in arrangement A
intersect elements in arrangement B. But these will not necessarily be
called for all the edges in the new arrangement. Say, for instance, that
none of the elements in A or B intersect at all; OverlayTraits will, if I
understand right, never have any input.

Should I abandon arrangements with history and imitate them by managing the
curve-handle-to-halfedge mapping manually through halfedge metadata (the
HalfedgeData of Arr_extended_dcel)? If I overlay two arrangements that have
my custom HalfedgeData values assigned to their halfedges, do the
HalfedgeData values get preserved automatically in the new arrangement or do
I need to make a custom OverlayTraits model to ensure that?    



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