3 files changed, 73 insertions, 0 deletions
diff --git a/src/common/example/CGAL_points_off_reader.cpp b/src/common/example/CGAL_points_off_reader.cpp
new file mode 100644
index 00000000..45e9f1e6
--- /dev/null
+++ b/src/common/example/CGAL_points_off_reader.cpp
@@ -0,0 +1,44 @@
+#include <gudhi/Points_off_io.h>
+
+// For CGAL points type in dimension d
+// cf. http://doc.cgal.org/latest/Kernel_d/classCGAL_1_1Point__d.html
+#include <CGAL/Epick_d.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+typedef CGAL::Epick_d< CGAL::Dynamic_dimension_tag > Kernel;
+typedef typename Kernel::Point_d Point_d;
+
+void usage(int argc, char * const progName) {
+  std::cerr << "Error: Number of arguments (" << argc << ") is not correct" << std::endl;
+  std::cerr << "Usage: " << progName << " inputFile.off" << std::endl;
+  exit(-1);
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) usage(argc, (argv[0] - 1));
+
+  std::string offInputFile(argv[1]);
+  // Read the OFF file (input file name given as parameter) and triangulate points
+  Gudhi::Points_off_reader<Point_d> off_reader(offInputFile);
+  // Check the read operation was correct
+  if (!off_reader.is_valid()) {
+    std::cerr << "Unable to read file " << offInputFile << std::endl;
+    exit(-1);
+  }
+
+  // Retrieve the triangulation
+  std::vector<Point_d> point_cloud = off_reader.get_point_cloud();
+
+  int n = 0;
+  for (auto point : point_cloud) {
+    std::cout << "Point[" << n << "] = ";
+    for (int i = 0; i < point.dimension(); i++)
+      std::cout << point[i] << " ";
+    std::cout << "\n";
+    ++n;
+  }
+  return 0;
+}
diff --git a/src/common/example/CMakeLists.txt b/src/common/example/CMakeLists.txt
new file mode 100644
index 00000000..5aeaa8c6
--- /dev/null
+++ b/src/common/example/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 2.6)
+project(GUDHIDelaunayTriangulationOffFileReadWrite)
+
+# need CGAL 4.7
+if(CGAL_FOUND)
+  if (NOT CGAL_VERSION VERSION_LESS 4.7.0)
+    find_package(Eigen3 3.1.0)
+    if (EIGEN3_FOUND)
+      message(STATUS "Eigen3 version: ${EIGEN3_VERSION}.")
+      include( ${EIGEN3_USE_FILE} )
+      
+      add_executable ( cgaloffreader CGAL_points_off_reader.cpp )
+      target_link_libraries(cgaloffreader  ${Boost_SYSTEM_LIBRARY} ${CGAL_LIBRARY})
+      add_test(cgaloffreader ${CMAKE_CURRENT_BINARY_DIR}/cgaloffreader ${CMAKE_SOURCE_DIR}/data/points/alphacomplexdoc.off)
+
+    else()
+      message(WARNING "Eigen3 not found. Version 3.1.0 is required for Alpha shapes feature.")
+    endif()
+  else()
+    message(WARNING "CGAL version: ${CGAL_VERSION} is too old to compile Alpha shapes feature. Version 4.6.0 is required.")
+  endif ()
+endif()
diff --git a/src/common/example/cgaloffreader_result.txt b/src/common/example/cgaloffreader_result.txt
new file mode 100644
index 00000000..1deb8dbd
--- /dev/null
+++ b/src/common/example/cgaloffreader_result.txt
@@ -0,0 +1,7 @@
+Point[0] = 1 1 
+Point[1] = 7 0 
+Point[2] = 4 6 
+Point[3] = 9 6 
+Point[4] = 0 14 
+Point[5] = 2 19 
+Point[6] = 9 17