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/*
* Skeleton_blockers_triangles_iterators.h
*
* Created on: Aug 25, 2014
* Author: dsalinas
*/
#ifndef GUDHI_SKELETON_BLOCKERS_TRIANGLES_ITERATORS_H_
#define GUDHI_SKELETON_BLOCKERS_TRIANGLES_ITERATORS_H_
#include "boost/iterator/iterator_facade.hpp"
#include <memory>
namespace Gudhi{
namespace skbl {
//////////////////////////////////////////////////////////////////////
/**
* \brief Iterator over the triangles that are
* adjacent to a vertex of the simplicial complex.
* \remark Will be removed soon -> dont look
*/
template<typename Complex,typename LinkType>
class Triangle_around_vertex_iterator : public boost::iterator_facade
< Triangle_around_vertex_iterator <Complex,LinkType>
, typename Complex::Simplex_handle const
, boost::forward_traversal_tag
, typename Complex::Simplex_handle const
>
{
friend class boost::iterator_core_access;
template<typename T> friend class Triangle_iterator;
private:
typedef typename LinkType::Vertex_handle Vertex_handle;
typedef typename LinkType::Root_vertex_handle Root_vertex_handle;
typedef typename LinkType::Simplex_handle Simplex_handle;
typedef Complex_edge_iterator<Complex> Complex_edge_iterator_;
const Complex* complex_;
Vertex_handle v_;
std::shared_ptr<LinkType> link_;
Complex_edge_iterator_ current_edge_;
bool is_end_;
public:
Triangle_around_vertex_iterator(const Complex* complex,Vertex_handle v):
complex_(complex),v_(v),link_(new LinkType(*complex,v_)),
current_edge_(link_->edge_range().begin()),
is_end_(current_edge_ == link_->edge_range().end()){
}
/**
* @brief ugly hack to get an iterator to the end
*/
Triangle_around_vertex_iterator(const Complex* complex,Vertex_handle v,bool is_end):
complex_(complex),v_(v),link_(0),is_end_(true){
}
/**
* @brief ugly hack to get an iterator to the end
*/
Triangle_around_vertex_iterator():
complex_(0),v_(-1),link_(0),is_end_(true){
}
Triangle_around_vertex_iterator(const Triangle_around_vertex_iterator& other){
v_ = other.v_;
complex_ = other.complex_;
is_end_ = other.is_end_;
if(!is_end_){
link_ = other.link_;
current_edge_= other.current_edge_;
}
}
bool equal(const Triangle_around_vertex_iterator& other) const{
return (complex_==other.complex_) && ((finished() &&other.finished()) || current_edge_ == other.current_edge_);
}
Simplex_handle dereference() const{
Root_vertex_handle v1 = (*link_)[*current_edge_].first();
Root_vertex_handle v2 = (*link_)[*current_edge_].second();
return Simplex_handle(v_,*(complex_->get_address(v1)),*(complex_->get_address(v2)));
}
void increment(){
++current_edge_;
}
private:
bool finished() const{
return is_end_ || (current_edge_ == link_->edge_range().end());
}
};
/**
* \brief Iterator over the triangles of the
* simplicial complex.
* \remark Will be removed soon -> dont look
*
*/
template<typename SkeletonBlockerComplex>
class Triangle_iterator :
public boost::iterator_facade<
Triangle_iterator <SkeletonBlockerComplex>,
typename SkeletonBlockerComplex::Simplex_handle const
, boost::forward_traversal_tag
, typename SkeletonBlockerComplex::Simplex_handle const
>
{
friend class boost::iterator_core_access;
private:
typedef typename SkeletonBlockerComplex::Vertex_handle Vertex_handle;
typedef typename SkeletonBlockerComplex::Root_vertex_handle Root_vertex_handle;
typedef typename SkeletonBlockerComplex::Simplex_handle Simplex_handle;
typedef typename SkeletonBlockerComplex::Superior_triangle_around_vertex_iterator STAVI;
const SkeletonBlockerComplex* complex_;
Complex_vertex_iterator<SkeletonBlockerComplex> current_vertex_;
STAVI current_triangle_;
bool is_end_;
public:
/*
* @remark assume that the complex is non-empty
*/
Triangle_iterator(const SkeletonBlockerComplex* complex):
complex_(complex),
current_vertex_(complex->vertex_range().begin()),
current_triangle_(complex,*current_vertex_), // xxx this line is problematic is the complex is empty
is_end_(false){
assert(!complex->empty());
gotoFirstTriangle();
}
private:
//goto to the first triangle or to the end if none
void gotoFirstTriangle(){
if(!is_finished() && current_triangle_.finished()){
goto_next_vertex();
}
}
public:
/**
* @brief ugly hack to get an iterator to the end
* @remark assume that the complex is non-empty
*/
Triangle_iterator(const SkeletonBlockerComplex* complex,bool is_end):
complex_(complex),
current_vertex_(complex->vertex_range().end()),
current_triangle_(), // xxx this line is problematic is the complex is empty
is_end_(true){
}
Triangle_iterator& operator=(const Triangle_iterator & other){
complex_ = other.complex_;
Complex_vertex_iterator<SkeletonBlockerComplex> current_vertex_;
STAVI current_triangle_;
return *this;
}
bool equal(const Triangle_iterator& other) const{
bool both_are_finished = is_finished() && other.is_finished();
bool both_arent_finished = !is_finished() && !other.is_finished();
// if the two iterators are not finished, they must have the same state
return (complex_==other.complex_) &&
(both_are_finished ||
( (both_arent_finished) && current_vertex_ == other.current_vertex_ && current_triangle_ == other.current_triangle_));
}
Simplex_handle dereference() const{
return *current_triangle_;
}
private:
// goto the next vertex that has a triangle pending or the
// end vertex iterator if none exists
void goto_next_vertex(){
assert(current_triangle_.finished()); //we mush have consume all triangles passing through the vertex
assert(!is_finished()); // we must not be done
++current_vertex_;
if(!is_finished()){
current_triangle_ = STAVI(complex_, *current_vertex_);
if(current_triangle_.finished())
goto_next_vertex();
}
}
public:
void increment(){
if(!current_triangle_.finished()){
++current_triangle_; // problem here
if(current_triangle_.finished())
goto_next_vertex();
}
else{
assert(!is_finished());
goto_next_vertex();
}
}
private:
bool is_finished() const{
return is_end_ || current_vertex_ == complex_->vertex_range().end();
}
};
}
} // namespace GUDHI
#endif /* GUDHI_SKELETON_BLOCKERS_TRIANGLES_ITERATORS_H_ */
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