Factorization of from functions

Add exact alpha complex 3d example


git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/alpha_3d_fix@2168 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 1c55851fd2ebcf8ec553854baca803c08b6634c4

1 files changed, 76 insertions, 0 deletions

diff --git a/src/Persistent_cohomology/example/alpha_complex_3d_helper.h b/src/Persistent_cohomology/example/alpha_complex_3d_helper.h
new file mode 100644
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--- /dev/null
+++ b/src/Persistent_cohomology/example/alpha_complex_3d_helper.h
@@ -0,0 +1,76 @@
+/*    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):       Vincent Rouvreau
+ *
+ *    Copyright (C) 2014  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/>.
+ */
+
+#ifndef EXAMPLE_PERSISTENT_COHOMOLOGY_ALPHA_COMPLEX_3D_HELPER_H_
+#define EXAMPLE_PERSISTENT_COHOMOLOGY_ALPHA_COMPLEX_3D_HELPER_H_
+
+template<class Vertex_list, class Cell_handle>
+Vertex_list from_cell(const Cell_handle& ch) {
+  Vertex_list the_list;
+  for (auto i = 0; i < 4; i++) {
+#ifdef DEBUG_TRACES
+    std::cout << "from cell[" << i << "]=" << ch->vertex(i)->point() << std::endl;
+#endif  // DEBUG_TRACES
+    the_list.push_back(ch->vertex(i));
+  }
+  return the_list;
+}
+
+template<class Vertex_list, class Facet>
+Vertex_list from_facet(const Facet& fct) {
+  Vertex_list the_list;
+  for (auto i = 0; i < 4; i++) {
+    if (fct.second != i) {
+#ifdef DEBUG_TRACES
+      std::cout << "from facet=[" << i << "]" << fct.first->vertex(i)->point() << std::endl;
+#endif  // DEBUG_TRACES
+      the_list.push_back(fct.first->vertex(i));
+    }
+  }
+  return the_list;
+}
+
+template<class Vertex_list, class Edge_3>
+Vertex_list from_edge(const Edge_3& edg) {
+  Vertex_list the_list;
+  for (auto i = 0; i < 4; i++) {
+    if ((edg.second == i) || (edg.third == i)) {
+#ifdef DEBUG_TRACES
+      std::cout << "from edge[" << i << "]=" << edg.first->vertex(i)->point() << std::endl;
+#endif  // DEBUG_TRACES
+      the_list.push_back(edg.first->vertex(i));
+    }
+  }
+  return the_list;
+}
+
+template<class Vertex_list, class Vertex_handle>
+Vertex_list from_vertex(const Vertex_handle& vh) {
+  Vertex_list the_list;
+#ifdef DEBUG_TRACES
+  std::cout << "from vertex=" << vh->point() << std::endl;
+#endif  // DEBUG_TRACES
+  the_list.push_back(vh);
+  return the_list;
+}
+
+#endif  // EXAMPLE_PERSISTENT_COHOMOLOGY_ALPHA_COMPLEX_3D_HELPER_H_