pythonfield.C

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/*
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifdef _USE_NANOBIND
    #include<nanobind/nanobind.h>
    // must include converters here so that compiler can pickup template specialization for arrays
    #include"../../bindings/python/oofemarray-nanobind.h"
    namespace nb = nanobind;
#else
    #include <pybind11/embed.h>
    namespace py = pybind11;
#endif
 
 
#include "field.h"
#include "pythonfield.h"
#include "floatarray.h"
#include "timestep.h"
 
 
 
namespace oofem {
// REGISTER_Material(PythonField);
 

PythonField :: PythonField(void) : Field(FieldType::FT_Unknown)
{
    //pybind11::print("Hello, World!"); // use the Python API
}
 
void PythonField :: setFunctionName(std::string functionName){
    this->functionName = functionName;
}
 
 
void PythonField :: setModuleName(std::string moduleName){
    this->moduleName = moduleName;
    //this->moduleName.resize(this->moduleName.size()); //remove trailing quotes
}
 
int PythonField :: evaluateAt(FloatArray &answer, const FloatArray &coords, ValueModeType mode, TimeStep *tStep)
{
    // Do not use the raw CPython API functions Py_Initialize and Py_Finalize as these do not properly handle the lifetime of pybind11’s internal data.
    // https://pybind11.readthedocs.io/en/stable/advanced/embedding.html
    
    // py::scoped_interpreter guard{}; // start the interpreter and keep it alive
    
//     py::initialize_interpreter();
    #ifdef _USE_NANOBIND
        nb::module_ calc = nb::module_::import_(moduleName.c_str());
        nb::object result = calc.attr(functionName.c_str())(nb::cast(coords), nb::cast(mode), nb::cast(tStep));
        answer = nb::cast<FloatArray>(result);
    #else
        py::module calc = py::module::import(moduleName.c_str());
        py::object result = calc.attr(functionName.c_str())(coords, mode, tStep);
        answer = result.cast<FloatArray>();
    #endif
 
 
//     py::finalize_interpreter();
    
    return 0;
}
 
int PythonField :: evaluateAt(FloatArray &answer, DofManager *dman, ValueModeType mode, TimeStep *tStep)
{
    OOFEM_ERROR("Not implemented");
    return 1;
}
 
 
 
} // end namespace oofem