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#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <boost/graph/kruskal_min_spanning_tree.hpp>
#include <iostream>
#include <fstream>
#include <list>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
typedef CGAL::Surface_mesh<Point> Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<Mesh>::vertex_iterator vertex_iterator;
typedef boost::graph_traits<Mesh>::edge_descriptor edge_descriptor;
void kruskal(const Mesh& sm)
{
// We use the default edge weight which is the squared length of the edge
std::list<edge_descriptor> mst;
boost::kruskal_minimum_spanning_tree(sm,
std::back_inserter(mst));
std::cout << "#VRML V2.0 utf8\n"
"Shape {\n"
" appearance Appearance {\n"
" material Material { emissiveColor 1 0 0}}\n"
" geometry\n"
" IndexedLineSet {\n"
" coord Coordinate {\n"
" point [ \n";
vertex_iterator vb,ve;
for(std::tie(vb, ve) = vertices(sm); vb!=ve; ++vb){
std::cout << " " << sm.point(*vb) << "\n";
}
std::cout << " ]\n"
" }\n"
" coordIndex [\n";
for(std::list<edge_descriptor>::iterator it = mst.begin(); it != mst.end(); ++it)
{
edge_descriptor e = *it ;
vertex_descriptor s = source(e,sm);
vertex_descriptor t = target(e,sm);
std::cout << " " << s << ", " << t << ", -1\n";
}
std::cout << "]\n"
" }#IndexedLineSet\n"
"}# Shape\n";
}
int main(int argc, char** argv)
{
Mesh sm;
std::string fname = argc==1?CGAL::data_file_path("meshes/knot1.off"):argv[1];
if(!CGAL::IO::read_polygon_mesh(fname, sm))
{
std::cerr << "Invalid input file." << std::endl;
return EXIT_FAILURE;
}
kruskal(sm);
return 0;
}
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