Add of hyper sphere and cube generator of OFF files.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/alphashapes@473 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 894167c2f2ab6e9f209b35adb8d362b09c6eeec5

3 files changed, 176 insertions, 0 deletions

diff --git a/data/points/generator/CMakeLists.txt b/data/points/generator/CMakeLists.txt
new file mode 100644
index 00000000..42f3e3ee
--- /dev/null
+++ b/data/points/generator/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 2.6)
+project(GUDHIPointsGenerator)
+
+if(CGAL_FOUND)
+  include( ${CGAL_USE_FILE} )
+
+  find_package(Eigen3 3.1.0)
+  if (EIGEN3_FOUND)
+    include( ${EIGEN3_USE_FILE} )
+    include_directories (BEFORE "../../include")
+
+    add_executable ( hypergenerator hypergenerator.cpp )
+    add_test(hypergenerator_on_sphere_3000_10_5.0 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator on sphere onSphere.off 3000 10 5.0)
+    add_test(hypergenerator_on_sphere_10000_3 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator on sphere onSphere.off 10000 3)
+    add_test(hypergenerator_in_sphere_7000_12_10.8 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator in sphere inSphere.off 7000 12 10.8)
+    add_test(hypergenerator_in_sphere_50000_2 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator in sphere inSphere.off 50000 2)
+    # on cube is not available in CGAL
+    add_test(hypergenerator_in_cube_7000_12_10.8 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator in cube inCube.off 7000 12 10.8)
+    add_test(hypergenerator_in_cube_50000_2 ${CMAKE_CURRENT_BINARY_DIR}/hypergenerator in cube inCube.off 50000 2)
+  endif()
+endif()
diff --git a/data/points/generator/README b/data/points/generator/README
new file mode 100644
index 00000000..e6b28eb0
--- /dev/null
+++ b/data/points/generator/README
@@ -0,0 +1,26 @@
+To build the example, run in a Terminal:
+
+cd /path-to-gudhi/
+cmake .
+cd /path-to-data-generator/
+make
+
+
+Example of use :
+
+*** Hyper sphere|cube generator
+
+./hypergenerator on sphere onSphere.off 1000 3 15.2
+
+ => generates a onSphere.off file with 1000 points randomized on a sphere of dimension 3 and radius 15.2
+
+./hypergenerator in sphere inSphere.off 100 2
+
+ => generates a inSphere.off file with 100 points randomized in a sphere of dimension 2 (circle) and radius 1.0 (default)
+
+./hypergenerator in cube inCube.off 10000 3 5.8
+
+ => generates a inCube.off file with 10000 points randomized in a cube of dimension 3 and side 5.8
+
+!! Warning: hypegenerator on cube is not available !!
+
diff --git a/data/points/generator/hypergenerator.cpp b/data/points/generator/hypergenerator.cpp
new file mode 100644
index 00000000..f4ea6b07
--- /dev/null
+++ b/data/points/generator/hypergenerator.cpp
@@ -0,0 +1,129 @@
+/*    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/>.
+ */
+
+#include <CGAL/Epick_d.h>
+#include <CGAL/point_generators_d.h>
+#include <CGAL/algorithm.h>
+#include <CGAL/assertions.h>
+
+#include <iostream>
+#include <iterator>
+#include <vector>
+#include <fstream>  // for std::ofstream
+
+
+typedef CGAL::Epick_d< CGAL::Dynamic_dimension_tag > K;
+typedef K::Point_d Point;
+
+void usage(char * const progName) {
+  std::cerr << "Usage: " << progName << " in|on sphere|cube off_file_name points_number[integer > 0] dimension[integer > 1] radius[double > 0.0 | default = 1.0]" << std::endl;
+  exit(-1); // ----- >>
+}
+
+int main(int argc, char **argv) {
+  // program args management
+  if ((argc != 6) && (argc != 7)) {
+    std::cerr << "Error: Number of arguments (" << argc << ") is not correct" << std::endl;
+    usage(argv[0]);
+  }
+
+  int points_number = 0;
+  int returnedScanValue = sscanf(argv[4], "%d", &points_number);
+  if ((returnedScanValue == EOF) || (points_number <= 0)) {
+    std::cerr << "Error: " << argv[4] << " is not correct" << std::endl;
+    usage(argv[0]);
+  }
+
+  int dimension = 0;
+  returnedScanValue = sscanf(argv[5], "%d", &dimension);
+  if ((returnedScanValue == EOF) || (dimension <= 0)) {
+    std::cerr << "Error: " << argv[5] << " is not correct" << std::endl;
+    usage(argv[0]);
+  }
+
+  double radius = 1.0;
+  if (argc == 7) {
+    returnedScanValue = sscanf(argv[6], "%lf", &radius);
+    if ((returnedScanValue == EOF) || (radius <= 0.0)) {
+      std::cerr << "Error: " << argv[6] << " is not correct" << std::endl;
+      usage(argv[0]);
+    }
+  }
+
+  bool in = false;
+  if (strcmp(argv[1], "in") == 0) {
+    in = true;
+  } else if (strcmp(argv[1], "on") != 0) {
+      std::cerr << "Error: " << argv[1] << " is not correct" << std::endl;
+      usage(argv[0]);
+  }
+
+  bool sphere = false;
+  if (memcmp(argv[2], "sphere", sizeof("sphere")) == 0) {
+    sphere = true;
+  } else if (memcmp(argv[2], "cube", sizeof("cube")) != 0) {
+      std::cerr << "Error: " << argv[2] << " is not correct" << std::endl;
+      usage(argv[0]);
+  }
+
+  std::ofstream diagram_out(argv[3]);
+  diagram_out << "OFF" << std::endl;
+  diagram_out << points_number << " 0 0" << std::endl;
+
+  if (diagram_out.is_open()) {
+    // Instanciate a random point generator
+    CGAL::Random rng(0);
+    // Generate "points_number" random points in a vector
+    std::vector<Point> points;
+    if (in) {
+      if (sphere) {
+        CGAL::Random_points_in_ball_d<Point> rand_it(dimension, radius, rng);
+        CGAL::cpp11::copy_n(rand_it, points_number, std::back_inserter(points));
+      } else {
+        CGAL::Random_points_in_cube_d<Point> rand_it(dimension, radius, rng);
+        CGAL::cpp11::copy_n(rand_it, points_number, std::back_inserter(points));
+      }
+    } else {  // means "on"
+      if (sphere) {
+        CGAL::Random_points_on_sphere_d<Point> rand_it(dimension, radius, rng);
+        CGAL::cpp11::copy_n(rand_it, points_number, std::back_inserter(points));
+      } else {
+        std::cerr << "Sorry: on cube is not available" << std::endl;
+        usage(argv[0]);
+      }
+    }
+
+    for (auto thePoint : points) {
+      int i = 0;
+      for (;i < dimension - 1; i++) {
+        diagram_out << thePoint[i] << " ";
+      }
+      diagram_out << thePoint[i] << std::endl;  // last point + Carriage Return
+    }
+  } else {
+    std::cerr << "Error: " << argv[3] << " cannot be opened" << std::endl;
+    usage(argv[0]);
+  }
+
+  return 0;
+}
+