Add example

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/subsampling_and_spatialsearching@1351 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 2b99baa9a43854119a46ec8ce11b93f00ef74835

2 files changed, 55 insertions, 0 deletions

diff --git a/src/Spatial_searching/example/CMakeLists.txt b/src/Spatial_searching/example/CMakeLists.txt
new file mode 100644
index 00000000..0846c232
--- /dev/null
+++ b/src/Spatial_searching/example/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 2.6)
+project(Spatial_searching_examples)
+
+if(CGAL_FOUND)
+  if (NOT CGAL_VERSION VERSION_LESS 4.8.0)
+    message(STATUS "CGAL version: ${CGAL_VERSION}.")
+
+    message(STATUS "Eigen3 version: ${EIGEN3_VERSION}.")
+    include( ${EIGEN3_USE_FILE} )
+    include_directories (BEFORE "../../include")
+
+    add_executable( Spatial_searching_example_spatial_searching example_spatial_searching.cpp )
+  else()
+    message(WARNING "CGAL version: ${CGAL_VERSION} is too old to compile Spatial_searching examples. Version 4.8.0 is required.")
+  endif ()
+else()
+  message(WARNING "CGAL not found. It is required for the Spatial_searching examples.")
+endif()
diff --git a/src/Spatial_searching/example/example_spatial_searching.cpp b/src/Spatial_searching/example/example_spatial_searching.cpp
new file mode 100644
index 00000000..ba387b71
--- /dev/null
+++ b/src/Spatial_searching/example/example_spatial_searching.cpp
@@ -0,0 +1,37 @@
+#include <gudhi/Spatial_tree_data_structure.h>
+
+#include <CGAL/Epick_d.h>
+#include <CGAL/Random.h>
+
+#include <array>
+#include <vector>
+
+namespace gss = Gudhi::spatial_searching;
+
+int main (void)
+{
+  typedef CGAL::Epick_d<CGAL::Dimension_tag<4> >      K;
+  typedef typename K::FT                              FT;
+  typedef typename K::Point_d                         Point;
+  typedef std::vector<Point>                          Points;
+
+  typedef gss::Spatial_tree_data_structure<K, Points> Points_ds;
+  typedef typename Points_ds::KNS_range               KNS_range;
+  typedef typename Points_ds::KNS_iterator            KNS_iterator;
+  typedef typename Points_ds::INS_range               INS_range;
+  typedef typename Points_ds::INS_iterator            INS_iterator;
+
+  CGAL::Random rd;
+
+  Points points;
+  for (int i = 0; i < 500; ++i)
+    points.push_back(Point(std::array<FT, 4>({ rd.get_double(-1.,1),rd.get_double(-1.,1),rd.get_double(-1.,1),rd.get_double(-1.,1) })));
+
+  Points_ds points_ds(points);
+
+  auto kns_range = points_ds.query_ANN(points[20], 10, true);
+  for (auto const& nghb : kns_range)
+    std::cout << nghb.first << " (sq. dist. = " << nghb.second << ")\n";
+
+  return 0;
+}