swapNodeCoordinateAxes.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#include <tclap/CmdLine.h>
 
#include <array>
#include <memory>
#include <string>
 
#include "BaseLib/Logging.h"
#include "BaseLib/MPI.h"
#include "BaseLib/TCLAPArguments.h"
#include "InfoLib/GitInfo.h"
#include "MeshLib/IO/readMeshFromFile.h"
#include "MeshLib/IO/writeMeshToFile.h"
#include "MeshLib/Mesh.h"
#include "MeshLib/Node.h"
 
static void swapNodeCoordinateAxes(MeshLib::Mesh const& mesh,
                                   std::array<int, 3> const& new_axes_indices)
{
    double new_coords[3] = {};
    for (MeshLib::Node* node : mesh.getNodes())
    {
        for (int i = 0; i < 3; i++)
        {
            new_coords[i] = (*node)[new_axes_indices[i]];
        }
        for (int i = 0; i < 3; i++)
        {
            (*node)[i] = new_coords[i];
        }
    }
}
 
static bool parseNewOrder(std::string const& str_order,
                          std::array<int, 3>& new_axes_indices)
{
    if (str_order.length() != 3)
    {
        ERR("Invalid argument for the new order. The argument should contain "
            "three characters.");
        return false;
    }
 
    new_axes_indices.fill(-1);
 
    for (int i = 0; i < 3; i++)
    {
        if (str_order[i] == 'x')
        {
            new_axes_indices[i] = 0;
        }
        else if (str_order[i] == 'y')
        {
            new_axes_indices[i] = 1;
        }
        else if (str_order[i] == 'z')
        {
            new_axes_indices[i] = 2;
        }
        else
        {
            ERR("Invalid argument for the new order. The  given argument "
                "contains a character other than 'x', 'y', 'z'.");
            return false;
        }
    }
 
    bool isAxisSet[3] = {false};
    for (int new_axes_indice : new_axes_indices)
    {
        if (isAxisSet[new_axes_indice])
        {
            ERR("Invalid argument for the new order. The argument contains "
                "some character used more than once.");
            return false;
        }
        isAxisSet[new_axes_indice] = true;
    }
 
    return true;
}
 
int main(int argc, char* argv[])
{
    TCLAP::CmdLine cmd(
        "Swap node coordinate values.\n\n"
        "OpenGeoSys-6 software, version " +
            GitInfoLib::GitInfo::ogs_version +
            ".\n"
            "Copyright (c) 2012-2026, OpenGeoSys Community "
            "(http://www.opengeosys.org)",
        ' ', GitInfoLib::GitInfo::ogs_version);
    TCLAP::ValueArg<std::string> input_arg("i", "input-mesh-file",
                                           "Input (.vtu) mesh file", true, "",
                                           "INPUT_FILE");
    cmd.add(input_arg);
    TCLAP::ValueArg<std::string> output_arg("o", "output-mesh-file",
                                            "Output (.vtu) mesh file", true, "",
                                            "OUTPUT_FILE");
    cmd.add(output_arg);
    TCLAP::ValueArg<std::string> new_order_arg(
        "n", "new-order",
        "the new order of swapped coordinate values (e.g. 'xzy' for converting "
        "XYZ values to XZY values)",
        true, "", "NEW_ORDER");
    cmd.add(new_order_arg);
    auto log_level_arg = BaseLib::makeLogLevelArg();
    cmd.add(log_level_arg);
    cmd.parse(argc, argv);
 
    BaseLib::MPI::Setup mpi_setup(argc, argv);
    BaseLib::initOGSLogger(log_level_arg.getValue());
 
    const std::string str_order = new_order_arg.getValue();
    std::array<int, 3> new_order = {{}};
    if (!parseNewOrder(str_order, new_order))
    {
        return EXIT_FAILURE;
    }
 
    std::unique_ptr<MeshLib::Mesh> mesh(
        MeshLib::IO::readMeshFromFile(input_arg.getValue()));
    if (!mesh)
    {
        return EXIT_FAILURE;
    }
 
    if (mesh->getDimension() == 3)
    {
        WARN(
            "Swapping coordinate values of 3D elements can result in incorrect "
            "node-ordering.");
    }
 
    INFO("Exchange node coordinates from xyz to {:s}",
         new_order_arg.getValue().data());
    swapNodeCoordinateAxes(*mesh, new_order);
 
    INFO("Save the new mesh into a file");
    MeshLib::IO::writeMeshToFile(*mesh, output_arg.getValue());
 
    return EXIT_SUCCESS;
}