1 files changed, 54 insertions, 0 deletions
diff --git a/example/Cech_complex/cech_complex_example_from_points.cpp b/example/Cech_complex/cech_complex_example_from_points.cpp
new file mode 100644
index 00000000..3cc5a4df
--- /dev/null
+++ b/example/Cech_complex/cech_complex_example_from_points.cpp
@@ -0,0 +1,54 @@
+#include <gudhi/Cech_complex.h>
+#include <gudhi/Simplex_tree.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <array>
+
+int main() {
+  // Type definitions
+  using Point_cloud = std::vector<std::array<double, 2>>;
+  using Simplex_tree = Gudhi::Simplex_tree<Gudhi::Simplex_tree_options_fast_persistence>;
+  using Filtration_value = Simplex_tree::Filtration_value;
+  using Cech_complex = Gudhi::cech_complex::Cech_complex<Simplex_tree, Point_cloud>;
+
+  Point_cloud points;
+  points.push_back({1., 0.});                  // 0
+  points.push_back({0., 1.});                  // 1
+  points.push_back({2., 1.});                  // 2
+  points.push_back({3., 2.});                  // 3
+  points.push_back({0., 3.});                  // 4
+  points.push_back({3. + std::sqrt(3.), 3.});  // 5
+  points.push_back({1., 4.});                  // 6
+  points.push_back({3., 4.});                  // 7
+  points.push_back({2., 4. + std::sqrt(3.)});  // 8
+  points.push_back({0., 4.});                  // 9
+  points.push_back({-0.5, 2.});                // 10
+
+  // ----------------------------------------------------------------------------
+  // Init of a Cech complex from points
+  // ----------------------------------------------------------------------------
+  Filtration_value max_radius = 1.;
+  Cech_complex cech_complex_from_points(points, max_radius);
+
+  Simplex_tree stree;
+  cech_complex_from_points.create_complex(stree, 2);
+  // ----------------------------------------------------------------------------
+  // Display information about the one skeleton Cech complex
+  // ----------------------------------------------------------------------------
+  std::cout << "Cech complex is of dimension " << stree.dimension() << " - " << stree.num_simplices() << " simplices - "
+            << stree.num_vertices() << " vertices." << std::endl;
+
+  std::cout << "Iterator on Cech complex simplices in the filtration order, with [filtration value]:" << std::endl;
+  for (auto f_simplex : stree.filtration_simplex_range()) {
+    std::cout << "   ( ";
+    for (auto vertex : stree.simplex_vertex_range(f_simplex)) {
+      std::cout << vertex << " ";
+    }
+    std::cout << ") -> "
+              << "[" << stree.filtration(f_simplex) << "] ";
+    std::cout << std::endl;
+  }
+  return 0;
+}