如何打印Delaunay图的边？
如何打印Delaunay图的边？
提问于 2016-05-25 13:33:59
下面是：How to print the faces of a Voronoi diagram?，我现在有：
#include <iostream>
#include <fstream>
#include <cassert>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Segment_Delaunay_graph_2.h>
#include <CGAL/Segment_Delaunay_graph_adaptation_policies_2.h>
#include <CGAL/Segment_Delaunay_graph_traits_2.h>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Segment_Delaunay_graph_traits_2<K> Gt;
typedef CGAL::Segment_Delaunay_graph_2<Gt> DT;
int main() {
std::ifstream ifs("data.cin");
assert( ifs );
DT vd;
DT::Site_2 site;
// read the sites from the stream and insert them in the diagram
while ( ifs >> site ) { vd.insert( site ); }
ifs.close();
// validate the diagram
assert( vd.is_valid(true, 1) );
std::cout << std::endl << std::endl;
// Iterate over edges
DT::Finite_edges_iterator eit = vd.finite_edges_begin();
for (int k = 1; eit != vd.finite_edges_end(); ++eit, ++k) {
DT::Edge e = *eit;
//std::cout << e << std::endl;
}
}但是，不能(使用cout)简单地打印边缘。该怎么做呢？
下面是另一次尝试中的错误：
/home/gsamaras/CGAL-4.7/code/DelaunayTOvoronoi/delTovor.cpp:30:27: error: ‘CGAL::Triangulation_ds_edge_iterator_2<CGAL::Triangulation_data_structure_2<CGAL::Segment_Delaunay_graph_vertex_base_2<CGAL::Segment_Delaunay_graph_storage_traits_2<CGAL::Segment_Delaunay_graph_traits_2<CGAL::Epick> >, CGAL::Triangulation_ds_vertex_base_2<void> >, CGAL::Segment_Delaunay_graph_face_base_2<CGAL::Segment_Delaunay_graph_traits_2<CGAL::Epick>, CGAL::Triangulation_ds_face_base_2<void> > >, true>::Edge’ has no member named ‘site’
std::cout << eit->site() << std::endl;
^回答 1
Stack Overflow用户
回答已采纳
发布于 2016-05-25 16:31:16
您可以像这样打印形成边缘的站点：
for (int k = 1; eit != vd.finite_edges_end(); ++eit, ++k) {
DT::Edge e = *eit;
std::cout << "k = " << k << std::endl;
if ( vd.is_infinite(e.first->vertex( vd.ccw(e.second) )) )
std::cout << "infinite\n";
else
std::cout << e.first->vertex( vd.ccw(e.second) )->site() << std::endl;
if ( vd.is_infinite(e.first->vertex( vd.cw(e.second) )) )
std::cout << "infinite\n";
else
std::cout << e.first->vertex( vd.cw(e.second) )->site() << std::endl;
if ( vd.is_infinite(e.first->vertex( e.second )) )
std::cout << "infinite\n";
else
std::cout << e.first->vertex( e.second )->site() << std::endl;
if ( vd.is_infinite(vd.tds().mirror_vertex(e.first, e.second) ) )
std::cout << "infinite\n";
else
std::cout << vd.tds().mirror_vertex(e.first, e.second)->site() << std::endl;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37447998
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