Add rips complex module and first modification step

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/rips_complex_module@1577 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: fc949570c6cffa4756f84a15c41fadc8c45b2af2

2 files changed, 79 insertions, 0 deletions

diff --git a/src/Rips_complex/example/CMakeLists.txt b/src/Rips_complex/example/CMakeLists.txt
new file mode 100644
index 00000000..6d0deecf
--- /dev/null
+++ b/src/Rips_complex/example/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 2.6)
+project(Rips_complex_examples)
+
+add_executable ( ripsoffreader example_rips_complex_from_off_file.cpp )
+target_link_libraries(ripsoffreader  ${Boost_SYSTEM_LIBRARY})
+if (TBB_FOUND)
+  target_link_libraries(ripsoffreader ${TBB_LIBRARIES})
+endif()
diff --git a/src/Rips_complex/example/example_rips_complex_from_off_file.cpp b/src/Rips_complex/example/example_rips_complex_from_off_file.cpp
new file mode 100644
index 00000000..82baa68e
--- /dev/null
+++ b/src/Rips_complex/example/example_rips_complex_from_off_file.cpp
@@ -0,0 +1,71 @@
+#include <gudhi/Rips_complex.h>
+// to construct Rips_complex from a OFF file of points
+#include <gudhi/Points_off_io.h>
+// to construct a simplex_tree from rips complex
+#include <gudhi/Simplex_tree.h>
+#include <gudhi/distance_functions.h>
+
+#include <iostream>
+#include <string>
+
+void usage(int nbArgs, char * const progName) {
+  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
+  std::cerr << "Usage: " << progName << " filename.off threshold dim_max [ouput_file.txt]\n";
+  std::cerr << "       i.e.: " << progName << " ../../data/points/alphacomplexdoc.off 60.0\n";
+  exit(-1);  // ----- >>
+}
+
+int main(int argc, char **argv) {
+  if ((argc != 4) && (argc != 5)) usage(argc, (argv[0] - 1));
+
+  std::string off_file_name(argv[1]);
+  double threshold = atof(argv[2]);
+  int dim_max = atoi(argv[3]);
+
+  // Type definitions
+  using Point = std::vector<float>;
+  using Simplex_tree = Gudhi::Simplex_tree<>;
+  using Rips_complex = Gudhi::rips_complex::Rips_complex<Simplex_tree::Filtration_value>;
+
+  // ----------------------------------------------------------------------------
+  // Init of a rips complex from an OFF file
+  // ----------------------------------------------------------------------------
+  Gudhi::Points_off_reader<Point> off_reader(off_file_name);
+  Rips_complex rips_complex_from_file(off_reader.get_point_cloud(), threshold,
+                                      euclidean_distance<Point>);
+
+  std::streambuf* streambufffer;
+  std::ofstream ouput_file_stream;
+
+  if (argc == 5) {
+    ouput_file_stream.open(std::string(argv[4]));
+    streambufffer = ouput_file_stream.rdbuf();
+  } else {
+    streambufffer = std::cout.rdbuf();
+  }
+
+  Simplex_tree simplex;
+  if (rips_complex_from_file.create_complex(simplex, dim_max)) {
+    std::ostream output_stream(streambufffer);
+
+    // ----------------------------------------------------------------------------
+    // Display information about the rips complex
+    // ----------------------------------------------------------------------------
+    output_stream << "Rips complex is of dimension " << simplex.dimension() <<
+        " - " << simplex.num_simplices() << " simplices - " <<
+        simplex.num_vertices() << " vertices." << std::endl;
+
+    output_stream << "Iterator on rips complex simplices in the filtration order, with [filtration value]:" <<
+        std::endl;
+    for (auto f_simplex : simplex.filtration_simplex_range()) {
+      output_stream << "   ( ";
+      for (auto vertex : simplex.simplex_vertex_range(f_simplex)) {
+        output_stream << vertex << " ";
+      }
+      output_stream << ") -> " << "[" << simplex.filtration(f_simplex) << "] ";
+      output_stream << std::endl;
+    }
+  }
+  ouput_file_stream.close();
+  return 0;
+}