git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/Nerve_GIC@2771 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: cd87a5b72b67d27b21f765fac822ea69f9496019

1 files changed, 87 insertions, 0 deletions

diff --git a/src/Nerve_GIC/example/FuncGIC.cpp b/src/Nerve_GIC/example/FuncGIC.cpp
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+++ b/src/Nerve_GIC/example/FuncGIC.cpp
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       Mathieu Carrière
+ *
+ *    Copyright (C) 2017  INRIA Saclay (France)
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gudhi/GIC.h>
+
+void usage(int nbArgs, char * const progName) {
+  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
+  std::cerr << "Usage: " << progName << " filename.off function [--v] \n";
+  std::cerr << "       i.e.: " << progName << " ../../../../data/points/COIL_database/lucky_cat.off ../../../../data/points/COIL_database/lucky_cat_PCA1 --v \n";
+  exit(-1);  // ----- >>
+}
+
+int main(int argc, char **argv) {
+  if ((argc != 3) && (argc != 4)) usage(argc, argv[0]);
+
+  using Point = std::vector<float>;
+
+  std::string off_file_name(argv[1]);
+  std::string func_file_name = argv[2];
+  bool verb = 0; if(argc == 4)  verb = 1;
+
+  // -----------------------------------------
+  // Init of a functional GIC from an OFF file
+  // -----------------------------------------
+
+  Gudhi::graph_induced_complex::Graph_induced_complex<Point> GIC;
+  GIC.set_verbose(verb);
+
+  bool check = GIC.read_point_cloud(off_file_name);
+
+  if(!check)  std::cout << "Incorrect OFF file." << std::endl;
+  else{
+
+    GIC.set_color_from_file(func_file_name);
+    GIC.set_function_from_file(func_file_name);
+
+    GIC.set_graph_from_automatic_rips(Gudhi::Euclidean_distance());
+
+    GIC.set_automatic_resolution_for_GIC(); GIC.set_gain();
+    GIC.set_cover_from_function();
+
+    GIC.find_GIC_simplices_with_functional_minimal_cover();
+
+    GIC.plot_DOT();
+
+    Gudhi::Simplex_tree<> stree; GIC.create_complex(stree);
+
+    // --------------------------------------------
+    // Display information about the functional GIC
+    // --------------------------------------------
+
+    if(verb){
+      std::cout << "Functional GIC is of dimension " << stree.dimension() <<
+                     " - " << stree.num_simplices() << " simplices - " <<
+                     stree.num_vertices() << " vertices." << std::endl;
+
+      std::cout << "Iterator on functional GIC simplices" << std::endl;
+      for (auto f_simplex : stree.filtration_simplex_range()) {
+        for (auto vertex : stree.simplex_vertex_range(f_simplex)) {
+          std::cout << vertex << " ";
+        }
+        std::cout << std::endl;
+      }
+    }
+  }
+
+  return 0;
+}