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/*****************************************************************************
 * This file is part of Mapnik (c++ mapping toolkit)
 * Copyright (C) 2024 Artem Pavlenko
 * 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 library 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *****************************************************************************/
#include <mapnik/config.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/coord.hpp>
#include <mapnik/geometry/box2d.hpp>
#include <stdexcept>
#include <pybind11/pybind11.h>
namespace py = pybind11;
using mapnik::proj_transform;
using mapnik::projection;
namespace  {
mapnik::coord2d forward_transform_c(mapnik::proj_transform& t, mapnik::coord2d const& c)
    double x = c.x;
    double y = c.y;
    double z = 0.0;
    if (!t.forward(x,y,z)) {
        std::ostringstream s;
        s << "Failed to forward project "
          << t.definition();
        throw std::runtime_error(s.str());
    return mapnik::coord2d(x,y);
mapnik::coord2d backward_transform_c(mapnik::proj_transform& t, mapnik::coord2d const& c)
    double x = c.x;
    double y = c.y;
    double z = 0.0;
    if (!t.backward(x,y,z)) {
        std::ostringstream s;
        s << "Failed to back project "
         << t.definition();
        throw std::runtime_error(s.str());
    return mapnik::coord2d(x,y);
mapnik::box2d<double> forward_transform_env(mapnik::proj_transform& t, mapnik::box2d<double> const & box)
    mapnik::box2d<double> new_box = box;
    if (!t.forward(new_box)) {
        std::ostringstream s;
        s << "Failed to forward project "
          << t.definition();
        throw std::runtime_error(s.str());
    return new_box;
mapnik::box2d<double> backward_transform_env(mapnik::proj_transform& t, mapnik::box2d<double> const & box)
    mapnik::box2d<double> new_box = box;
    if (!t.backward(new_box)){
        std::ostringstream s;
        s << "Failed to back project "
          << t.definition();
        throw std::runtime_error(s.str());
    return new_box;
mapnik::box2d<double> forward_transform_env_p(mapnik::proj_transform& t, mapnik::box2d<double> const & box, unsigned int points)
    mapnik::box2d<double> new_box = box;
    if (!t.forward(new_box,points)) {
        std::ostringstream s;
        s << "Failed to forward project "
          << t.definition();
        throw std::runtime_error(s.str());
    return new_box;
mapnik::box2d<double> backward_transform_env_p(mapnik::proj_transform& t, mapnik::box2d<double> const & box, unsigned int points)
    mapnik::box2d<double> new_box = box;
    if (!t.backward(new_box,points)){
        std::ostringstream s;
        s << "Failed to back project "
          <<  t.definition();
        throw std::runtime_error(s.str());
    return new_box;
void export_proj_transform (py::module const& m)
    py::class_<proj_transform>(m, "ProjTransform")
        .def(py::init<projection const&, projection const&>(),
             "Constructs ProjTransform object")
        .def("forward", forward_transform_c)
        .def("backward",backward_transform_c)
        .def("forward", forward_transform_env)
        .def("backward",backward_transform_env)
        .def("forward", forward_transform_env_p)
        .def("backward",backward_transform_env_p)
        .def("definition",&proj_transform::definition)
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