From 9899ae167f281d10b1684dfcd02c6838c5bf28df Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspreemann@gmail.com>
Date: Fri, 2 Feb 2018 13:51:45 +0100
Subject: GUDHI 2.1.0 as released by upstream in a tarball.

---
 example/Nerve_GIC/FuncGIC.cpp | 94 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 example/Nerve_GIC/FuncGIC.cpp

(limited to 'example/Nerve_GIC/FuncGIC.cpp')

diff --git a/example/Nerve_GIC/FuncGIC.cpp b/example/Nerve_GIC/FuncGIC.cpp
new file mode 100644
index 00000000..cb0f0d63
--- /dev/null
+++ b/example/Nerve_GIC/FuncGIC.cpp
@@ -0,0 +1,94 @@
+/*    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
+ *
+ *    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>
+
+#include <string>
+#include <vector>
+
+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::cover_complex::Cover_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_type("GIC");
+
+    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();
+    GIC.set_gain();
+    GIC.set_cover_from_function();
+
+    GIC.find_simplices();
+
+    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;
+}
-- 
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