CGAL - Generalized Maps

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Generalized_map/gmap_3_dynamic_onmerge.cpp
#include <CGAL/Generalized_map.h>
#include <CGAL/Cell_attribute.h>
#include <iostream>
#include <cstdlib>
// My item class: no static functor is associated with Face_attribute.
struct Myitem
{
template<class GMap>
struct Dart_wrapper
{
typedef CGAL::Cell_attribute<GMap, double> Face_attribute; // A weight
typedef std::tuple<void,void,Face_attribute> Attributes;
};
};
// Definition of my generalized map.
typedef CGAL::Generalized_map<3,Myitem> GMap_3;
typedef GMap_3::Dart_descriptor Dart_descriptor;
typedef GMap_3::Attribute_type<2>::type Face_attribute;
// Functor called when two faces are merged.
struct Merge_functor
{
// operator() automatically called before a merge.
void operator()(Face_attribute& ca1, Face_attribute& ca2)
{
ca1.info()=ca1.info()+ca2.info(); // Update can be done incrementally.
std::cout<<"After on merge faces: info of face1="<<ca1.info()
<<", info of face2="<<ca2.info()<<std::endl;
}
};
// Functor called when one face is split in two.
struct Split_functor
{
Split_functor(GMap_3& amap) : mmap(amap)
{}
// operator() automatically called after a split.
void operator()(Face_attribute& ca1, Face_attribute& ca2)
{
// We need to reinitialize the weight of the two faces
GMap_3::size_type nb1=mmap.darts_of_cell<2>(ca1.dart()).size();
GMap_3::size_type nb2=mmap.darts_of_cell<2>(ca2.dart()).size();
mmap.info<2>(ca1.dart())*=(double(nb1)/(nb1+nb2));
mmap.info<2>(ca2.dart())*=(double(nb2)/(nb1+nb2));
std::cout<<"After on split faces: info of face1="<<ca1.info()
<<", info of face2="<<ca2.info()<<std::endl;
}
private:
GMap_3& mmap;
};
// Function allowing to display all the 2-attributes, and the characteristics
// of a given combinatorial map.
void display_map_and_2attributes(GMap_3& gm)
{
for (GMap_3::Attribute_range<2>::type::iterator
it=gm.attributes<2>().begin(), itend=gm.attributes<2>().end();
it!=itend; ++it)
{ std::cout<<gm.info_of_attribute<2>(it)<<"; "; }
std::cout<<std::endl;
gm.display_characteristics(std::cout);
std::cout<<", valid="<<gm.is_valid()<<std::endl;
}
int main()
{
GMap_3 gm;
// 0) Create 2 hexahedra.
Dart_descriptor d1 = gm.make_combinatorial_hexahedron();
Dart_descriptor d2 = gm.make_combinatorial_hexahedron();
// 1) Create and initialize 2-attributes.
for (GMap_3::One_dart_per_cell_range<2>::iterator
it=gm.one_dart_per_cell<2>().begin(),
itend=gm.one_dart_per_cell<2>().end(); it!=itend; ++it)
{
gm.set_attribute<2>(it, gm.create_attribute<2>(1));
}
// 2) Set the onsplit and onmerge functors.
gm.onsplit_functor<2>()=Split_functor(gm);
gm.onmerge_functor<2>()=Merge_functor();
// 3) 3-Sew the two hexahedra along one face. This calls 1 onmerge.
gm.sew<3>(d1, d2);
// 4) Display all the values of 2-attributes.
display_map_and_2attributes(gm);
// 5) Insert a vertex in the face between the two hexahedra.
// This calls 3 onsplit.
Dart_descriptor resdart=gm.insert_cell_0_in_cell_2(d2);
// 6) Display all the values of 2-attributes.
display_map_and_2attributes(gm);
// 7) "Remove" the dynamic onmerge functor.
gm.onmerge_functor<2>()=boost::function<void(Face_attribute&,
Face_attribute&)>();
// 8) Remove one edge: this merges two faces, however no dynamic
// functor is called (because it was removed).
gm.remove_cell<1>(resdart);
// 9) Display all the values of 2-attributes.
display_map_and_2attributes(gm);
return EXIT_SUCCESS;
}
CGAL::Cell_attribute
CGAL::Generalized_map
The class Generalized_map represents a dD generalized map.
Definition: Generalized_map.h:40