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/*
* Vertex_collapsor.h
*
* Created on: Sep 25, 2014
* Author: dsalinas
*/
#ifndef VERTEX_COLLAPSOR_H_
#define VERTEX_COLLAPSOR_H_
#include "utils/Edge_contractor.h"
#include "utils/Furthest_point_epsilon_net.h"
#include "utils/UI_utils.h"
/**
* Iteratively puts every vertex at the center of its neighbors
*/
template<typename SkBlComplex> class Vertex_collapsor{
private:
SkBlComplex& complex_;
size_t num_collapses_;
public:
typedef typename SkBlComplex::Vertex_handle Vertex_handle;
typedef typename SkBlComplex::Edge_handle Edge_handle;
/**
* @brief Modify complex to be the expansion of the k-nearest neighbor
* symetric graph.
*/
Vertex_collapsor(SkBlComplex& complex, size_t num_collapses) :
complex_(complex),num_collapses_(num_collapses)
{
// std::list<Vertex_handle> vertices;
// vertices.insert(vertices.begin(),complex_.vertex_range().begin(),complex_.vertex_range().end());
// UIDBG("Collapse vertices");
// collapse_vertices(vertices);
std::list<Vertex_handle> vertices;
UIDBG("Compute eps net");
Furthest_point_epsilon_net<Complex> eps_net(complex_);
for(auto vh : eps_net.net_filtration_)
vertices.push_back(vh.vertex_handle);
UIDBG("Collapse vertices");
collapse_vertices(vertices);
}
private:
void collapse_vertices(std::list<Vertex_handle>& vertices){
while(!vertices.empty() && num_collapses_--){
Vertex_handle current_vertex = vertices.front();
vertices.pop_front();
if(is_link_reducible(current_vertex))
complex_.remove_vertex(current_vertex);
}
}
bool is_link_reducible(Vertex_handle v){
auto link = complex_.link(v);
if(link.empty()) return false;
if(link.is_cone()) return true;
if(link.num_connected_components()>1) return false;
Edge_contractor<Complex> contractor(link,link.num_vertices()-1);
return (link.num_vertices()==1);
}
};
#endif /* VERTEX_COLLAPSOR_H_ */
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