C++ Way::nodes方法代码示例

                void way(const osmium::Way& way) {
                    if (m_write_change_ops) {
                        open_close_op_tag(way.visible() ? (way.version() == 1 ? operation::op_create : operation::op_modify) : operation::op_delete);
                    }

                    write_prefix();
                    m_out += "<way";
                    write_meta(way);

                    if (way.tags().empty() && way.nodes().empty()) {
                        m_out += "/>\n";
                        return;
                    }

                    m_out += ">\n";

                    for (const auto& node_ref : way.nodes()) {
                        write_prefix();
                        oprintf(m_out, "  <nd ref=\"%" PRId64 "\"/>\n", node_ref.ref());
                    }

                    write_tags(way.tags());

                    write_prefix();
                    m_out += "</way>\n";
                }

                void way(const osmium::Way& way) {
                    *m_out += 'w';
                    write_meta(way);

                    *m_out += " N";

                    if (!way.nodes().empty()) {
                        auto it = way.nodes().begin();
                        if (m_options.locations_on_ways) {
                            write_field_ref(*it);
                            for (++it; it != way.nodes().end(); ++it) {
                                *m_out += ',';
                                write_field_ref(*it);
                            }
                        } else {
                            write_field_int('n', it->ref());
                            for (++it; it != way.nodes().end(); ++it) {
                                *m_out += ',';
                                write_field_int('n', it->ref());
                            }
                        }
                    }

                    *m_out += '\n';
                }

 /**
  * Extract segments from given way and add them to the list.
  *
  * Segments connecting two nodes with the same location (ie
  * same node or different nodes with same location) are
  * removed after reporting the duplicate node.
  */
 uint32_t extract_segments_from_way(osmium::area::ProblemReporter* problem_reporter, const osmium::Way& way) {
     if (way.nodes().empty()) {
         return 0;
     }
     m_segments.reserve(way.nodes().size() - 1);
     return extract_segments_from_way_impl(problem_reporter, way, role_type::outer);
 }

    inline void parseWay(const osmium::Way& way)
    {
        const auto& tags = way.tags();
        auto it = std::find_if(tags.begin(), tags.end(), highway_filter);
        if (it == tags.end())
        {
            return;
        }

        const osmium::NodeRef& first = way.nodes().front();
        const osmium::NodeRef& last = way.nodes().back();

        // filter out closed ways, generally this will just cause false
        // positives with round-a-abouts
        if (first == last)
        {
            return;
        }

        const char* name = tags.get_value_by_key("name", "");
        const char* ref = tags.get_value_by_key("ref", "");

        unsigned name_id = getStringID(name);
        unsigned ref_id = getStringID(ref);

        // we can't use osmium ids because MultiMap expects unsigned keys
        unsigned long firstID = static_cast<unsigned long>(first.ref());
        unsigned long lastID = static_cast<unsigned long>(last.ref());

        const unsigned wayIdx = parsed_ways->size();
        endpoint_way_map->unsorted_set(firstID, wayIdx);
        endpoint_way_map->unsorted_set(lastID,  wayIdx);

        parsed_ways->emplace_back(way.id(), firstID, lastID, name_id, ref_id);
    }

    void way(const osmium::Way& way) {
        // detect a new way
        if (current_way_id != 0 && current_way_id != way.positive_id()) {
            write_way_extra_nodes();
            current_way_nodes.clear();
        }
        current_way_id = way.positive_id();

        if (debug) {
            std::cerr << "softcut way " << way.positive_id() << " v" << way.version() << "\n";
        }

        for (const auto& node_ref : way.nodes()) {
            current_way_nodes.insert(node_ref.positive_ref());
        }

        for (const auto& extract : info->extracts) {
            for (const auto& node_ref : way.nodes()) {
                if (extract->node_tracker.get(node_ref.positive_ref())) {
                    if (debug) {
                        std::cerr << "way has a node (" << node_ref.positive_ref() << ") inside extract, recording in way_tracker\n";
                    }
                    extract->way_tracker.set(way.positive_id());
                    break;
                }
            }
        }
    }

 /***
  * Insert error node into nodes table: way contains of one
  * coordinate.
  */
 void insert_way_error(const osmium::Way &way) {
     ErrorSum *sum = new ErrorSum();
     sum->set_way_error();
     ds.insert_node_feature(way.nodes().begin()->location(),
                            way.nodes().begin()->ref(), sum);
     delete sum;
 }

 void eway(extract_data& e, const osmium::Way& way) {
     for (const auto& nr : way.nodes()) {
         if (e.node_ids.get(nr.positive_ref())) {
             e.way_ids.set(way.positive_id());
             for (const auto& nr : way.nodes()) {
                 e.extra_node_ids.set(nr.ref());
             }
             return;
         }
     }
 }

            /**
             * Assemble an area from the given way.
             * The resulting area is put into the out_buffer.
             *
             * @returns false if there was some kind of error building the
             *          area, true otherwise.
             */
            bool operator()(const osmium::Way& way, osmium::memory::Buffer& out_buffer) {
                if (!config().create_way_polygons) {
                    return true;
                }

                if (config().problem_reporter) {
                    config().problem_reporter->set_object(osmium::item_type::way, way.id());
                    config().problem_reporter->set_nodes(way.nodes().size());
                }

                // Ignore (but count) ways without segments.
                if (way.nodes().size() < 2) {
                    ++stats().short_ways;
                    return false;
                }

                if (!way.ends_have_same_id()) {
                    ++stats().duplicate_nodes;
                    if (config().problem_reporter) {
                        config().problem_reporter->report_duplicate_node(way.nodes().front().ref(), way.nodes().back().ref(), way.nodes().front().location());
                    }
                }

                ++stats().from_ways;
                stats().invalid_locations = segment_list().extract_segments_from_way(config().problem_reporter,
                                                                                     stats().duplicate_nodes,
                                                                                     way);
                if (!config().ignore_invalid_locations && stats().invalid_locations > 0) {
                    return false;
                }

                if (config().debug_level > 0) {
                    std::cerr << "\nAssembling way " << way.id() << " containing " << segment_list().size() << " nodes\n";
                }

                // Now create the Area object and add the attributes and tags
                // from the way.
                const bool okay = create_area(out_buffer, way);
                if (okay) {
                    out_buffer.commit();
                } else {
                    out_buffer.rollback();
                }

                if (debug()) {
                    std::cerr << "Done: " << stats() << "\n";
                }

                return okay;
            }

                uint32_t extract_segments_from_way_impl(osmium::area::ProblemReporter* problem_reporter, uint64_t& duplicate_nodes, const osmium::Way& way, role_type role) {
                    uint32_t invalid_locations = 0;

                    osmium::NodeRef previous_nr;
                    for (const osmium::NodeRef& nr : way.nodes()) {
                        if (!nr.location().valid()) {
                            ++invalid_locations;
                            if (problem_reporter) {
                                problem_reporter->report_invalid_location(way.id(), nr.ref());
                            }
                            continue;
                        }
                        if (previous_nr.location()) {
                            if (previous_nr.location() != nr.location()) {
                                m_segments.emplace_back(previous_nr, nr, role, &way);
                            } else {
                                ++duplicate_nodes;
                                if (problem_reporter) {
                                    problem_reporter->report_duplicate_node(previous_nr.ref(), nr.ref(), nr.location());
                                }
                            }
                        }
                        previous_nr = nr;
                    }

                    return invalid_locations;
                }

 /***
  * Iterate through all nodes of waterways in pass 3 if way is coastline
  * or riverbank. Otherwise iterate just through the nodes between
  * firstnode and lastnode.
  */
 void way(const osmium::Way& way) {
     if (is_valid(way)) {
         if (check_all_nodes(way)) {
             for (auto node : way.nodes()) {
                 check_node(node);
             }
         } else {
             if (way.nodes().size() > 2) {
                 for (auto node = way.nodes().begin() + 1;
                         node != way.nodes().end() - 1; ++node) {
                     check_node(*node);
                 }
             }
         }
     }
 }

void output_pgsql_t::pgsql_out_way(osmium::Way const &way, taglist_t *tags,
                                   bool polygon, bool roads)
{
    if (polygon && way.is_closed()) {
        auto wkb = m_builder.get_wkb_polygon(way);
        if (!wkb.empty()) {
            expire.from_wkb(wkb.c_str(), way.id());
            if (m_enable_way_area) {
                char tmp[32];
                auto const area =
                    m_options.reproject_area
                        ? ewkb::parser_t(wkb).get_area<reprojection>(
                              m_options.projection.get())
                        : ewkb::parser_t(wkb)
                              .get_area<osmium::geom::IdentityProjection>();
                snprintf(tmp, sizeof(tmp), "%g", area);
                tags->push_override(tag_t("way_area", tmp));
            }
            m_tables[t_poly]->write_row(way.id(), *tags, wkb);
        }
    } else {
        double const split_at = m_options.projection->target_latlon() ? 1 : 100 * 1000;
        for (auto const &wkb : m_builder.get_wkb_line(way.nodes(), split_at)) {
            expire.from_wkb(wkb.c_str(), way.id());
            m_tables[t_line]->write_row(way.id(), *tags, wkb);
            if (roads) {
                m_tables[t_roads]->write_row(way.id(), *tags, wkb);
            }
        }

    }
}

 polygon_type create_polygon(const osmium::Way& way, use_nodes un=use_nodes::unique, direction dir = direction::forward) {
     try {
         return create_polygon(way.nodes(), un, dir);
     } catch (osmium::geometry_error& e) {
         e.set_id("way", way.id());
         throw;
     }
 }

 /**
  * Extract segments from given way and add them to the list.
  *
  * Segments connecting two nodes with the same location (ie same
  * node or different node with same location) are removed.
  *
  * XXX should two nodes with same location be reported?
  */
 void extract_segments_from_way(const osmium::Way& way, const char* role) {
     osmium::NodeRef last_nr;
     for (const osmium::NodeRef& nr : way.nodes()) {
         if (last_nr.location() && last_nr.location() != nr.location()) {
             m_segments.emplace_back(last_nr, nr, role, &way);
         }
         last_nr = nr;
     }
 }

 /**
  * This is called when a way is not in any multipolygon
  * relation.
  */
 void way_not_in_any_relation(const osmium::Way& way) {
     // you need at least 4 nodes to make up a polygon
     if (way.nodes().size() <= 3) {
         return;
     }
     try {
         if (!way.nodes().front().location() || !way.nodes().back().location()) {
             throw osmium::invalid_location{"invalid location"};
         }
         if (way.ends_have_same_location()) {
             // way is closed and has enough nodes, build simple multipolygon
             TAssembler assembler{m_assembler_config};
             assembler(way, this->buffer());
             m_stats += assembler.stats();
         }
     } catch (const osmium::invalid_location&) {
         // XXX ignore
     }
 }

 /**
  * This is called when a way is not in any multipolygon
  * relation.
  *
  * Overwritten from the base class.
  */
 void way_not_in_any_relation(const osmium::Way& way) {
     // you need at least 4 nodes to make up a polygon
     if (way.nodes().size() <= 3) {
         return;
     }
     try {
         if (!way.nodes().front().location() || !way.nodes().back().location()) {
             throw osmium::invalid_location("invalid location");
         }
         if (way.ends_have_same_location()) {
             // way is closed and has enough nodes, build simple multipolygon
             TAssembler assembler(m_assembler_config);
             assembler(way, m_output_buffer);
             possibly_flush_output_buffer();
         }
     } catch (osmium::invalid_location&) {
         // XXX ignore
     }
 }