WIP: Add Polygon(s) in C++ (2)

src/lib/include/xtgeo/xyz.hpp

@@ -0,0 +1,39 @@
+#ifndef XTGEO_XYZ_HPP
+#define XTGEO_XYZ_HPP
+
+#include <pybind11/pybind11.h>
+#include <xtgeo/types.hpp>
+
+namespace py = pybind11;
+
+namespace xtgeo {
+namespace xyz {
+
+inline void
+init(py::module &m)
+{
+    auto m_points =
+      m.def_submodule("points", "Internal functions for operations on point(s).");
+
+    py::class_<Point>(m_points, "Point")
+      .def(py::init<>())
+      .def(py::init<double, double>())          // Constructor with 2 arguments
+      .def(py::init<double, double, double>())  // Constructor with 3 arguments
+
+      .def_readwrite("x", &Point::x)
+      .def_readwrite("y", &Point::y)
+      .def_readwrite("z", &Point::z);
+
+    py::class_<Polygon>(m, "Polygon")
+      .def(py::init<>())
+      .def(py::init<const std::vector<xtgeo::xyz::Point> &>())
+      .def(py::init<const py::array_t<double> &>())
+      .def("add_point", &xtgeo::xyz::Polygon::add_point)
+      .def("size", &xtgeo::xyz::Polygon::size)
+      .def_readwrite("points", &xtgeo::xyz::Polygon::points);
+}
+
+}  // namespace xyz
+}  // namespace xtgeo
+
+#endif  // XTGEO_XYZ_HPP