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204 lines (169 loc) · 5.67 KB
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/**
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This file is part of osm2pgsql (https://osm2pgsql.org/).
*
* Copyright (C) 2006-2021 by the osm2pgsql developer community.
* For a full list of authors see the git log.
*/
#include <cassert>
#include <vector>
#include <osmium/area/geom_assembler.hpp>
#include "geom.hpp"
#include "osmium-builder.hpp"
namespace geom {
void osmium_builder_t::wrap_in_multipolygon(
osmium_builder_t::wkbs_t *geometries)
{
assert(!geometries->empty());
m_writer.multipolygon_start();
for (auto const &p : *geometries) {
m_writer.add_sub_geometry(p);
}
(*geometries)[0] = m_writer.multipolygon_finish(geometries->size());
geometries->resize(1);
}
void osmium_builder_t::wrap_in_multipolygon(osmium_builder_t::wkb_t *geometry)
{
m_writer.multipolygon_start();
m_writer.add_sub_geometry(*geometry);
*geometry = m_writer.multipolygon_finish(1);
}
osmium_builder_t::wkb_t
osmium_builder_t::get_wkb_node(osmium::Location const &loc) const
{
return m_writer.make_point(m_proj->reproject(loc));
}
osmium_builder_t::wkbs_t
osmium_builder_t::get_wkb_line(osmium::WayNodeList const &nodes,
double split_at)
{
std::vector<linestring_t> linestrings;
geom::make_line(linestring_t{nodes, *m_proj}, split_at, &linestrings);
wkbs_t ret;
for (auto const &line : linestrings) {
m_writer.linestring_start();
for (auto const &coord : line) {
m_writer.add_location(coord);
}
ret.push_back(m_writer.linestring_finish(line.size()));
}
return ret;
}
osmium_builder_t::wkb_t
osmium_builder_t::get_wkb_polygon(osmium::Way const &way)
{
osmium::area::AssemblerConfig area_config;
area_config.ignore_invalid_locations = true;
osmium::area::GeomAssembler assembler{area_config};
m_buffer.clear();
if (!assembler(way, m_buffer)) {
return wkb_t();
}
auto const wkbs = create_polygons(m_buffer.get<osmium::Area>(0));
return wkbs.empty() ? wkb_t{} : wkbs[0];
}
osmium_builder_t::wkbs_t
osmium_builder_t::get_wkb_multipolygon(osmium::Relation const &rel,
osmium::memory::Buffer const &ways,
bool build_multigeoms, bool wrap_multi)
{
osmium::area::AssemblerConfig area_config;
area_config.ignore_invalid_locations = true;
osmium::area::GeomAssembler assembler{area_config};
m_buffer.clear();
wkbs_t ret;
if (assembler(rel, ways, m_buffer)) {
auto const &area = m_buffer.get<osmium::Area>(0);
// This returns a vector of one or more polygons
ret = create_polygons(area);
assert(!ret.empty());
if (build_multigeoms) {
if (ret.size() > 1 || wrap_multi) {
wrap_in_multipolygon(&ret);
}
} else {
if (wrap_multi) {
for (auto &wkb : ret) {
// wrap each polygon into its own multipolygon
wrap_in_multipolygon(&wkb);
}
}
}
}
return ret;
}
osmium_builder_t::wkbs_t
osmium_builder_t::get_wkb_multiline(osmium::memory::Buffer const &ways,
double split_at)
{
std::vector<linestring_t> linestrings;
make_multiline(ways, split_at, *m_proj, &linestrings);
wkbs_t ret;
for (auto const &line : linestrings) {
m_writer.linestring_start();
for (auto const &coord : line) {
m_writer.add_location(coord);
}
ret.push_back(m_writer.linestring_finish(line.size()));
}
if (split_at <= 0.0 && !ret.empty()) {
auto const num_lines = ret.size();
m_writer.multilinestring_start();
for (auto const &line : ret) {
m_writer.add_sub_geometry(line);
}
ret.clear();
ret.push_back(m_writer.multilinestring_finish(num_lines));
}
return ret;
}
size_t osmium_builder_t::add_mp_points(osmium::NodeRefList const &nodes)
{
size_t num_points = 0;
osmium::Location last_location;
for (auto const &node_ref : nodes) {
if (node_ref.location().valid() &&
last_location != node_ref.location()) {
last_location = node_ref.location();
m_writer.add_location(m_proj->reproject(last_location));
++num_points;
}
}
return num_points;
}
osmium_builder_t::wkbs_t
osmium_builder_t::create_polygons(osmium::Area const &area)
{
wkbs_t ret;
try {
size_t num_rings = 0;
for (auto const &item : area) {
if (item.type() == osmium::item_type::outer_ring) {
auto const &ring = static_cast<osmium::OuterRing const &>(item);
if (num_rings > 0) {
ret.push_back(m_writer.polygon_finish(num_rings));
num_rings = 0;
}
m_writer.polygon_start();
m_writer.polygon_ring_start();
auto const num_points = add_mp_points(ring);
m_writer.polygon_ring_finish(num_points);
++num_rings;
} else if (item.type() == osmium::item_type::inner_ring) {
auto const &ring = static_cast<osmium::InnerRing const &>(item);
m_writer.polygon_ring_start();
auto const num_points = add_mp_points(ring);
m_writer.polygon_ring_finish(num_points);
++num_rings;
}
}
auto const wkb = m_writer.polygon_finish(num_rings);
if (num_rings > 0) {
ret.push_back(wkb);
}
} catch (osmium::geometry_error const &) { /* ignored */
}
return ret;
}
} // namespace geom