Merge the branch graph_expansion_with_blocker_oracle for the Simplex_tree

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/trunk@2759 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: fa4cf79042f8e9b162617a5a571e06a3feb4c191

3 files changed, 117 insertions, 3 deletions

diff --git a/src/Simplex_tree/example/CMakeLists.txt b/src/Simplex_tree/example/CMakeLists.txt
index e22cc92c..8bc4ad53 100644
--- a/src/Simplex_tree/example/CMakeLists.txt
+++ b/src/Simplex_tree/example/CMakeLists.txt
@@ -34,5 +34,12 @@ if(GMP_FOUND AND CGAL_FOUND)
       "${CMAKE_SOURCE_DIR}/data/points/bunny_5000.off")
 
   install(TARGETS Simplex_tree_example_alpha_shapes_3_from_off DESTINATION bin)
+endif()
 
+add_executable ( Simplex_tree_example_graph_expansion_with_blocker graph_expansion_with_blocker.cpp )
+if (TBB_FOUND)
+  target_link_libraries(Simplex_tree_example_graph_expansion_with_blocker ${TBB_LIBRARIES})
 endif()
+add_test(NAME Simplex_tree_example_graph_expansion_with_blocker COMMAND $<TARGET_FILE:Simplex_tree_example_graph_expansion_with_blocker>)
+
+install(TARGETS Simplex_tree_example_graph_expansion_with_blocker DESTINATION bin)
diff --git a/src/Simplex_tree/example/graph_expansion_with_blocker.cpp b/src/Simplex_tree/example/graph_expansion_with_blocker.cpp
new file mode 100644
index 00000000..86bfb8cb
--- /dev/null
+++ b/src/Simplex_tree/example/graph_expansion_with_blocker.cpp
@@ -0,0 +1,79 @@
+/*    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
+ *
+ *    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/Simplex_tree.h>
+
+#include <iostream>
+
+using Simplex_tree = Gudhi::Simplex_tree<>;
+using Simplex_handle = Simplex_tree::Simplex_handle;
+
+int main(int argc, char * const argv[]) {
+
+  // Construct the Simplex Tree with a 1-skeleton graph example
+  Simplex_tree simplexTree;
+
+  simplexTree.insert_simplex({0, 1}, 0.);
+  simplexTree.insert_simplex({0, 2}, 1.);
+  simplexTree.insert_simplex({0, 3}, 2.);
+  simplexTree.insert_simplex({1, 2}, 3.);
+  simplexTree.insert_simplex({1, 3}, 4.);
+  simplexTree.insert_simplex({2, 3}, 5.);
+  simplexTree.insert_simplex({2, 4}, 6.);
+  simplexTree.insert_simplex({3, 6}, 7.);
+  simplexTree.insert_simplex({4, 5}, 8.);
+  simplexTree.insert_simplex({4, 6}, 9.);
+  simplexTree.insert_simplex({5, 6}, 10.);
+  simplexTree.insert_simplex({6}, 10.);
+
+  simplexTree.expansion_with_blockers(3, [&](Simplex_handle sh){
+      bool result = false;
+      std::cout << "Blocker on [";
+      // User can loop on the vertices from the given simplex_handle i.e.
+      for (auto vertex : simplexTree.simplex_vertex_range(sh)) {
+        // We block the expansion, if the vertex '6' is in the given list of vertices
+        if (vertex == 6)
+          result = true;
+        std::cout << vertex << ", ";
+      }
+      std::cout << "] ( " << simplexTree.filtration(sh);
+      // User can re-assign a new filtration value directly in the blocker (default is the maximal value of boudaries)
+      simplexTree.assign_filtration(sh, simplexTree.filtration(sh) + 1.);
+
+      std::cout << " + 1. ) = " << result << std::endl;
+
+      return result;
+    });
+
+  std::cout << "********************************************************************\n";
+  std::cout << "* The complex contains " << simplexTree.num_simplices() << " simplices";
+  std::cout << "   - dimension " << simplexTree.dimension() << "\n";
+  std::cout << "* Iterator on Simplices in the filtration, with [filtration value]:\n";
+  for (auto f_simplex : simplexTree.filtration_simplex_range()) {
+    std::cout << "   " << "[" << simplexTree.filtration(f_simplex) << "] ";
+    for (auto vertex : simplexTree.simplex_vertex_range(f_simplex))
+      std::cout << "(" << vertex << ")";
+    std::cout << std::endl;
+  }
+
+  return 0;
+}
diff --git a/src/Simplex_tree/example/simple_simplex_tree.cpp b/src/Simplex_tree/example/simple_simplex_tree.cpp
index d8318f03..09cda526 100644
--- a/src/Simplex_tree/example/simple_simplex_tree.cpp
+++ b/src/Simplex_tree/example/simple_simplex_tree.cpp
@@ -194,9 +194,8 @@ int main(int argc, char * const argv[]) {
   std::cout << "* Iterator on Simplices in the filtration, with [filtration value]:\n";
   for (auto f_simplex : simplexTree.filtration_simplex_range()) {
     std::cout << "   " << "[" << simplexTree.filtration(f_simplex) << "] ";
-    for (auto vertex : simplexTree.simplex_vertex_range(f_simplex)) {
-      std::cout << static_cast<int>(vertex) << " ";
-    }
+    for (auto vertex : simplexTree.simplex_vertex_range(f_simplex))
+      std::cout << "(" << vertex << ")";
     std::cout << std::endl;
   }
   //   [0.1] 0
@@ -249,5 +248,34 @@ int main(int argc, char * const argv[]) {
     std::cout << "***+ YES IT IS!\n";
   else
     std::cout << "***- NO IT ISN'T\n";
+
+  simplexFound = simplexTree.find({ 0, 1 });
+  std::cout << "**************IS THE SIMPLEX {0,1} IN THE SIMPLEX TREE ?\n";
+  if (simplexFound != simplexTree.null_simplex())
+    std::cout << "***+ YES IT IS!\n";
+  else
+    std::cout << "***- NO IT ISN'T\n";
+
+  std::cout << "**************COFACES OF {0,1} IN CODIMENSION 1 ARE\n";
+  for (auto& simplex : simplexTree.cofaces_simplex_range(simplexTree.find({0,1}), 1)) {
+    for (auto vertex : simplexTree.simplex_vertex_range(simplex))
+      std::cout << "(" << vertex << ")";
+    std::cout << std::endl;
+  }
+
+  std::cout << "**************STARS OF {0,1} ARE\n";
+  for (auto& simplex : simplexTree.star_simplex_range(simplexTree.find({0,1}))) {
+    for (auto vertex : simplexTree.simplex_vertex_range(simplex))
+      std::cout << "(" << vertex << ")";
+    std::cout << std::endl;
+  }
+
+  std::cout << "**************BOUNDARIES OF {0,1,2} ARE\n";
+  for (auto& simplex : simplexTree.boundary_simplex_range(simplexTree.find({0,1,2}))) {
+    for (auto vertex : simplexTree.simplex_vertex_range(simplex))
+      std::cout << "(" << vertex << ")";
+    std::cout << std::endl;
+  }
+
   return 0;
 }