475 lines
13 KiB
C++
475 lines
13 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/geometry/boost_adapters.hpp>
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/geometry/multi_point.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/coord.hpp>
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#include <mapnik/util/is_clockwise.hpp>
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#include <mapnik/util/trim.hpp>
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// boost
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#include <boost/geometry/algorithms/envelope.hpp>
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#ifdef MAPNIK_USE_PROJ
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// proj
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#include <proj.h>
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#endif
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// stl
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#include <vector>
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#include <stdexcept>
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namespace mapnik {
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namespace { // (local)
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// Returns points in clockwise order. This allows us to do anti-meridian checks.
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template <typename T>
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auto envelope_points(box2d<T> const& env, std::size_t num_points)
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-> geometry::multi_point<T>
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{
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auto width = env.width();
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auto height = env.height();
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geometry::multi_point<T> coords;
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coords.reserve(num_points);
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// top side: left >>> right
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// gets extra point if (num_points % 4 >= 1)
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for (std::size_t i = 0, n = (num_points + 3) / 4; i < n; ++i)
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{
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auto x = env.minx() + (i * width) / n;
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coords.emplace_back(x, env.maxy());
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}
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// right side: top >>> bottom
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// gets extra point if (num_points % 4 >= 3)
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for (std::size_t i = 0, n = (num_points + 1) / 4; i < n; ++i)
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{
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auto y = env.maxy() - (i * height) / n;
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coords.emplace_back(env.maxx(), y);
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}
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// bottom side: right >>> left
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// gets extra point if (num_points % 4 >= 2)
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for (std::size_t i = 0, n = (num_points + 2) / 4; i < n; ++i)
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{
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auto x = env.maxx() - (i * width) / n;
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coords.emplace_back(x, env.miny());
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}
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// left side: bottom >>> top
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// never gets extra point
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for (std::size_t i = 0, n = (num_points + 0) / 4; i < n; ++i)
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{
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auto y = env.miny() + (i * height) / n;
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coords.emplace_back(env.minx(), y);
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}
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return coords;
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}
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} // namespace mapnik::(local)
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proj_transform::proj_transform(projection const& source,
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projection const& dest)
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: is_source_longlat_(false),
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is_dest_longlat_(false),
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is_source_equal_dest_(false),
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wgs84_to_merc_(false),
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merc_to_wgs84_(false)
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{
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is_source_equal_dest_ = (source == dest);
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if (!is_source_equal_dest_)
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{
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is_source_longlat_ = source.is_geographic();
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is_dest_longlat_ = dest.is_geographic();
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boost::optional<well_known_srs_e> src_k = source.well_known();
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boost::optional<well_known_srs_e> dest_k = dest.well_known();
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bool known_trans = false;
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if (src_k && dest_k)
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{
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if (*src_k == WGS_84 && *dest_k == WEB_MERC)
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{
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wgs84_to_merc_ = true;
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known_trans = true;
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}
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else if (*src_k == WEB_MERC && *dest_k == WGS_84)
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{
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merc_to_wgs84_ = true;
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known_trans = true;
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}
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}
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if (!known_trans)
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{
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#ifdef MAPNIK_USE_PROJ
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ctx_ = proj_context_create();
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transform_ = proj_create_crs_to_crs(ctx_,
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source.params().c_str(),
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dest.params().c_str(), nullptr);
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if (transform_ == nullptr)
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{
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throw std::runtime_error(std::string("Cannot initialize proj_transform for given projections: '") + source.params() + "'->'" + dest.params() + "'");
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}
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PJ* transform_gis = proj_normalize_for_visualization(ctx_, transform_);
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if (transform_gis == nullptr)
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{
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throw std::runtime_error(std::string("Cannot initialize proj_transform for given projections: '") + source.params() + "'->'" + dest.params() + "'");
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}
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proj_destroy(transform_);
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transform_ = transform_gis;
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#else
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throw std::runtime_error(std::string("Cannot initialize proj_transform for given projections without proj support (-DMAPNIK_USE_PROJ): '") + source.params() + "'->'" + dest.params() + "'");
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#endif
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}
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}
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}
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proj_transform::~proj_transform()
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{
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#ifdef MAPNIK_USE_PROJ
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if (transform_)
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{
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proj_destroy(transform_);
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transform_ = nullptr;
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}
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if (ctx_)
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{
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proj_context_destroy(ctx_);
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ctx_ = nullptr;
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}
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#endif
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}
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bool proj_transform::equal() const
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{
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return is_source_equal_dest_;
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}
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bool proj_transform::is_known() const
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{
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return merc_to_wgs84_ || wgs84_to_merc_;
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}
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bool proj_transform::forward (double & x, double & y , double & z) const
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{
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return forward(&x, &y, &z, 1);
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}
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bool proj_transform::forward (geometry::point<double> & p) const
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{
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double z = 0;
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return forward(&(p.x), &(p.y), &z, 1);
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}
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unsigned int proj_transform::forward (std::vector<geometry::point<double>> & ls) const
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{
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std::size_t size = ls.size();
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if (size == 0) return 0;
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if (is_source_equal_dest_)
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return 0;
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if (wgs84_to_merc_)
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{
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lonlat2merc(ls);
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return 0;
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}
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else if (merc_to_wgs84_)
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{
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merc2lonlat(ls);
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return 0;
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}
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geometry::point<double> * ptr = ls.data();
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double * x = reinterpret_cast<double*>(ptr);
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double * y = x + 1;
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double * z = nullptr;
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if(!forward(x, y, z, size, 2))
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{
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return size;
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}
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return 0;
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}
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bool proj_transform::forward (double * x, double * y , double * z, std::size_t point_count, std::size_t offset) const
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{
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if (is_source_equal_dest_)
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return true;
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if (wgs84_to_merc_)
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{
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return lonlat2merc(x, y, point_count, offset);
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}
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else if (merc_to_wgs84_)
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{
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return merc2lonlat(x, y, point_count, offset);
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}
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#ifdef MAPNIK_USE_PROJ
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if (proj_trans_generic(transform_, PJ_FWD,
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x, offset * sizeof(double), point_count,
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y, offset * sizeof(double), point_count,
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z, offset * sizeof(double), point_count,
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0, 0, 0) != point_count)
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return false;
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#endif
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return true;
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}
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bool proj_transform::backward (double * x, double * y , double * z, std::size_t point_count, std::size_t offset) const
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{
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if (is_source_equal_dest_)
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return true;
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if (wgs84_to_merc_)
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{
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return merc2lonlat(x, y, point_count, offset);
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}
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else if (merc_to_wgs84_)
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{
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return lonlat2merc(x, y, point_count, offset);
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}
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#ifdef MAPNIK_USE_PROJ
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if (proj_trans_generic(transform_, PJ_INV,
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x, offset * sizeof(double), point_count,
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y, offset * sizeof(double), point_count,
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z, offset * sizeof(double), point_count,
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0, 0, 0) != point_count)
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return false;
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#endif
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return true;
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}
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bool proj_transform::backward (double & x, double & y , double & z) const
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{
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return backward(&x, &y, &z, 1);
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}
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bool proj_transform::backward (geometry::point<double> & p) const
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{
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double z = 0;
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return backward(&(p.x), &(p.y), &z, 1);
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}
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unsigned int proj_transform::backward (std::vector<geometry::point<double>> & ls) const
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{
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std::size_t size = ls.size();
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if (size == 0) return 0;
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if (is_source_equal_dest_)
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return 0;
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if (wgs84_to_merc_)
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{
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merc2lonlat(ls);
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return 0;
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}
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else if (merc_to_wgs84_)
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{
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lonlat2merc(ls);
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return 0;
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}
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geometry::point<double> * ptr = ls.data();
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double * x = reinterpret_cast<double*>(ptr);
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double * y = x + 1;
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double * z = nullptr;
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if (!backward(x, y, z, size, 2))
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{
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return size;
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}
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return 0;
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}
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bool proj_transform::forward (box2d<double> & box) const
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{
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if (is_source_equal_dest_)
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return true;
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double llx = box.minx();
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double ulx = box.minx();
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double lly = box.miny();
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double lry = box.miny();
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double lrx = box.maxx();
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double urx = box.maxx();
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double uly = box.maxy();
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double ury = box.maxy();
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double z = 0.0;
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if (!forward(llx,lly,z))
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return false;
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if (!forward(lrx,lry,z))
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return false;
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if (!forward(ulx,uly,z))
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return false;
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if (!forward(urx,ury,z))
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return false;
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double minx = std::min(ulx, llx);
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double miny = std::min(lly, lry);
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double maxx = std::max(urx, lrx);
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double maxy = std::max(ury, uly);
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box.init(minx,
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miny,
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maxx,
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maxy);
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return true;
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}
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bool proj_transform::backward (box2d<double> & box) const
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{
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if (is_source_equal_dest_)
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return true;
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double x[4], y[4];
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x[0] = box.minx(); // llx 0
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y[0] = box.miny(); // lly 1
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x[1] = box.maxx(); // lrx 2
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y[1] = box.miny(); // lry 3
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x[2] = box.minx(); // ulx 4
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y[2] = box.maxy(); // uly 5
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x[3] = box.maxx(); // urx 6
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y[3] = box.maxy(); // ury 7
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if (!backward(x, y, nullptr, 4, 1))
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return false;
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double minx = std::min(x[0], x[2]);
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double miny = std::min(y[0], y[1]);
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double maxx = std::max(x[1], x[3]);
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double maxy = std::max(y[2], y[3]);
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box.init(minx, miny, maxx, maxy);
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return true;
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}
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// More robust, but expensive, bbox transform
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// in the face of proj4 out of bounds conditions.
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// Can result in 20 -> 10 r/s performance hit.
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// Alternative is to provide proper clipping box
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// in the target srs by setting map 'maximum-extent'
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bool proj_transform::backward(box2d<double>& env, std::size_t points) const
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{
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if (is_source_equal_dest_)
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return true;
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if (wgs84_to_merc_ || merc_to_wgs84_)
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{
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return backward(env);
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}
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auto coords = envelope_points(env, points); // this is always clockwise
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for (auto & p : coords)
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{
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double z = 0;
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if (!backward(p.x, p.y, z))
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return false;
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}
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box2d<double> result;
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boost::geometry::envelope(coords, result);
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if (is_source_longlat_ && !util::is_clockwise(coords))
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{
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// we've gone to a geographic CS, and our clockwise envelope has
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// changed into an anticlockwise one. This means we've crossed the antimeridian, and
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// need to expand the X direction to +/-180 to include all the data. Once we can deal
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// with multiple bboxes in queries we can improve.
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double miny = result.miny();
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result.expand_to_include(-180.0, miny);
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result.expand_to_include(180.0, miny);
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}
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env.re_center(result.center().x, result.center().y);
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env.height(result.height());
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env.width(result.width());
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return true;
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}
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bool proj_transform::forward(box2d<double>& env, std::size_t points) const
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{
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if (is_source_equal_dest_)
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return true;
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if (wgs84_to_merc_ || merc_to_wgs84_)
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{
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return forward(env);
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}
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auto coords = envelope_points(env, points); // this is always clockwise
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for (auto & p : coords)
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{
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double z = 0;
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if (!forward(p.x, p.y, z))
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return false;
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}
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box2d<double> result;
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boost::geometry::envelope(coords, result);
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if (is_dest_longlat_ && !util::is_clockwise(coords))
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{
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// we've gone to a geographic CS, and our clockwise envelope has
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// changed into an anticlockwise one. This means we've crossed the antimeridian, and
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// need to expand the X direction to +/-180 to include all the data. Once we can deal
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// with multiple bboxes in queries we can improve.
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double miny = result.miny();
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result.expand_to_include(-180.0, miny);
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result.expand_to_include(180.0, miny);
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}
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env.re_center(result.center().x, result.center().y);
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env.height(result.height());
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env.width(result.width());
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return true;
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}
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std::string proj_transform::definition() const
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{
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#ifdef MAPNIK_USE_PROJ
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if (transform_)
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{
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PJ_PROJ_INFO info = proj_pj_info(transform_);
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return mapnik::util::trim_copy(info.definition);
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}
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else
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#endif
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if (wgs84_to_merc_)
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{
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return "wgs84 => merc";
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}
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else if (merc_to_wgs84_)
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{
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return "merc => wgs84";
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}
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return "unknown";
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}
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}
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