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#include <gudhi/Alpha_complex_3d.h>
// to construct a simplex_tree from alpha complex
#include <gudhi/Simplex_tree.h>
#include <iostream>
#include <string>
#include <vector>
#include <limits> // for numeric limits
using Alpha_complex_3d = Gudhi::alpha_complex::Alpha_complex_3d<Gudhi::alpha_complex::complexity::SAFE, false, false>;
using Point = Alpha_complex_3d::Point_3;
using Vector_of_points = std::vector<Point>;
int main(int argc, char **argv) {
if (argc != 1) {
std::cerr << "Error: Number of arguments (" << argc << ") is not correct\n";
std::cerr << "Usage: " << (argv[0] - 1) << " \n";
exit(-1); // ----- >>
}
// ----------------------------------------------------------------------------
// Init of a list of points from a small molecule
// ----------------------------------------------------------------------------
Vector_of_points points;
points.push_back(Point(1, -1, -1));
points.push_back(Point(-1, 1, -1));
points.push_back(Point(-1, -1, 1));
points.push_back(Point(1, 1, 1));
points.push_back(Point(2, 2, 2));
// ----------------------------------------------------------------------------
// Init of an alpha complex from the list of points
// ----------------------------------------------------------------------------
Alpha_complex_3d alpha_complex_from_points(points);
Gudhi::Simplex_tree<> simplex;
if (alpha_complex_from_points.create_complex(simplex)) {
// ----------------------------------------------------------------------------
// Display information about the alpha complex
// ----------------------------------------------------------------------------
std::cout << "Alpha complex is of dimension " << simplex.dimension() << " - " << simplex.num_simplices()
<< " simplices - " << simplex.num_vertices() << " vertices." << std::endl;
std::cout << "Iterator on alpha complex simplices in the filtration order, with [filtration value]:" << std::endl;
for (auto f_simplex : simplex.filtration_simplex_range()) {
std::cout << " ( ";
for (auto vertex : simplex.simplex_vertex_range(f_simplex)) {
std::cout << vertex << " ";
}
std::cout << ") -> "
<< "[" << simplex.filtration(f_simplex) << "] ";
std::cout << std::endl;
}
}
return 0;
}
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