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bind_py_cell.cc
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bind_py_cell.cc
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/**
* @file bind_py_cell.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 09 Jan 2018
*
* @brief Python bindings for the cell factory function
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "common/common.hh"
#include "common/ccoord_operations.hh"
#include "cell/cell_factory.hh"
#include "cell/cell_base.hh"
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include "pybind11/eigen.h"
#include <sstream>
#include <memory>
using namespace muSpectre;
namespace py=pybind11;
using namespace pybind11::literals;
/**
* the cell factory is only bound for default template parameters
*/
template <Dim_t dim>
void add_cell_factory_helper(py::module & mod) {
using Ccoord = Ccoord_t<dim>;
using Rcoord = Rcoord_t<dim>;
using Form = Formulation;
mod.def
("CellFactory",
[](Ccoord res, Rcoord lens, Form form) {
return make_cell(std::move(res), std::move(lens), std::move(form));
},
"resolutions"_a,
"lengths"_a=CcoordOps::get_cube<dim>(1.),
"formulation"_a=Formulation::finite_strain);
}
void add_cell_factory(py::module & mod) {
add_cell_factory_helper<twoD >(mod);
add_cell_factory_helper<threeD>(mod);
}
/**
* CellBase for which the material and spatial dimension are identical
*/
template <Dim_t dim>
void add_cell_base_helper(py::module & mod) {
std::stringstream name_stream{};
name_stream << "CellBase" << dim << 'd';
const std::string name = name_stream.str();
using sys_t = CellBase<dim, dim>;
py::class_<sys_t>(mod, name.c_str())
.def("__len__", &sys_t::size)
.def("__iter__", [](sys_t & s) {
return py::make_iterator(s.begin(), s.end());
})
.def("initialise", &sys_t::initialise, "flags"_a=FFT_PlanFlags::estimate)
.def("directional_stiffness",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
if (!cell.is_initialised()) {
cell.initialise();
}
const std::string out_name{"temp output for directional stiffness"};
const std::string in_name{"temp input for directional stiffness"};
constexpr bool create_tangent{true};
auto & K = cell.get_tangent(create_tangent);
auto & input = cell.get_managed_field(in_name);
auto & output = cell.get_managed_field(out_name);
input.eigen() = v;
cell.directional_stiffness(K, input, output);
return output.eigen();
},
"δF"_a)
.def("project",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
if (!cell.is_initialised()) {
cell.initialise();
}
const std::string in_name{"temp input for projection"};
auto & input = cell.get_managed_field(in_name);
input.eigen() = v;
cell.project(input);
return input.eigen();
},
"field"_a)
.def("get_strain",[](sys_t & s) {
return Eigen::ArrayXXd(s.get_strain().eigen());
})
.def("get_stress",[](sys_t & s) {
return Eigen::ArrayXXd(s.get_stress().eigen());
})
.def("size", &sys_t::size)
.def("evaluate_stress_tangent",
[](sys_t& cell, py::EigenDRef<Eigen::ArrayXXd>& v ) {
if ((size_t(v.cols()) != cell.size() ||
size_t(v.rows()) != dim*dim)) {
std::stringstream err{};
err << "need array of shape (" << dim*dim << ", "
<< cell.size() << ") but got (" << v.rows() << ", "
<< v.cols() << ").";
throw std::runtime_error(err.str());
}
auto & strain{cell.get_strain()};
strain.eigen() = v;
cell.evaluate_stress_tangent(strain);
},
"strain"_a)
.def("get_G",
&sys_t::get_projection);
}
void add_cell_base(py::module & mod) {
add_cell_base_helper<twoD> (mod);
add_cell_base_helper<threeD>(mod);
}
void add_cell(py::module & mod) {
add_cell_factory(mod);
auto cell{mod.def_submodule("cell")};
cell.doc() = "bindings for cells and cell factories";
cell.def("scale_by_2", [](py::EigenDRef<Eigen::ArrayXXd>& v) {
v *= 2;
});
add_cell_base(cell);
}

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