From d68ddc94bd82c48a4433ae0b3b1b3f10c167ed0b Mon Sep 17 00:00:00 2001
From: Hind <hind.montassif@gmail.com>
Date: Wed, 28 Apr 2021 14:05:03 +0200
Subject: Add points (dataset type) before the underlying model (sphere) as a
 module

---
 .../gudhi/datasets/generators/points/sphere.cc     | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/python/gudhi/datasets/generators/points/sphere.cc

(limited to 'src/python/gudhi/datasets/generators/points/sphere.cc')

diff --git a/src/python/gudhi/datasets/generators/points/sphere.cc b/src/python/gudhi/datasets/generators/points/sphere.cc
new file mode 100644
index 00000000..79392ef0
--- /dev/null
+++ b/src/python/gudhi/datasets/generators/points/sphere.cc
@@ -0,0 +1,61 @@
+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Hind Montassif
+ *
+ *    Copyright (C) 2021 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#include <pybind11/pybind11.h>
+#include <pybind11/numpy.h>
+
+#include <gudhi/random_point_generators.h>
+#include <gudhi/Debug_utils.h>
+
+#include <CGAL/Epick_d.h>
+
+namespace py = pybind11;
+
+
+typedef CGAL::Epick_d< CGAL::Dynamic_dimension_tag > Kern;
+
+py::array_t<double> generate_points_on_sphere(size_t num_points, int dim, double radius) {
+
+    py::array_t<double> points({num_points, (size_t)dim});
+
+    py::buffer_info buf = points.request();
+    double *ptr = static_cast<double *>(buf.ptr);
+
+    GUDHI_CHECK(num_points == buf.shape[0], "Py array first dimension not matching num_points on sphere");
+    GUDHI_CHECK(dim == buf.shape[1], "Py array second dimension not matching the ambient space dimension");
+
+
+    py::gil_scoped_release release;
+    auto points_generated = Gudhi::generate_points_on_sphere_d<Kern>(num_points, dim, radius);
+
+    for (size_t i = 0; i < num_points; i++)
+        for (int j = 0; j < dim; j++)
+            ptr[i*dim+j] = points_generated[i][j];
+
+    return points;
+}
+
+PYBIND11_MODULE(sphere, m) {
+      m.attr("__license__") = "LGPL v3";
+      m.def("generate_random_points", &generate_points_on_sphere,
+          py::arg("num_points"), py::arg("dim"), py::arg("radius") = 1,
+          R"pbdoc(
+    Generate random i.i.d. points uniformly on a (d-1)-sphere in R^d
+
+    :param num_points: The number of points to be generated.
+    :type num_points: unsigned integer
+    :param dim: The dimension.
+    :type dim: integer
+    :param radius: The radius.
+    :type radius: float
+    :rtype: numpy array of float
+    :returns: the generated points on a sphere.
+    )pbdoc");
+}
-- 
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