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area.hpp
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#ifndef OSMIUM_OSM_AREA_HPP
#define OSMIUM_OSM_AREA_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <osmium/memory/collection.hpp>
#include <osmium/memory/item.hpp>
#include <osmium/memory/item_iterator.hpp>
#include <osmium/osm/box.hpp>
#include <osmium/osm/item_type.hpp>
#include <osmium/osm/node_ref_list.hpp>
#include <osmium/osm/object.hpp>
#include <osmium/osm/types.hpp>
#include <cassert>
#include <cstdlib>
#include <iterator>
#include <utility>
namespace osmium {
namespace builder {
template <typename TDerived, typename T>
class OSMObjectBuilder;
} // namespace builder
class OuterRing : public NodeRefList {
public:
static constexpr osmium::item_type itemtype = osmium::item_type::outer_ring;
constexpr static bool is_compatible_to(osmium::item_type t) noexcept {
return t == itemtype;
}
OuterRing() :
NodeRefList(itemtype) {
}
}; // class OuterRing
class InnerRing : public NodeRefList {
public:
static constexpr osmium::item_type itemtype = osmium::item_type::inner_ring;
constexpr static bool is_compatible_to(osmium::item_type t) noexcept {
return t == itemtype;
}
InnerRing() :
NodeRefList(itemtype) {
}
}; // class InnerRing
inline osmium::object_id_type object_id_to_area_id(osmium::object_id_type id, osmium::item_type type) noexcept {
osmium::object_id_type area_id = std::abs(id) * 2;
if (type == osmium::item_type::relation) {
++area_id;
}
return id < 0 ? -area_id : area_id;
}
inline osmium::object_id_type area_id_to_object_id(osmium::object_id_type id) noexcept {
return id / 2;
}
class Area : public OSMObject {
template <typename TDerived, typename T>
friend class osmium::builder::OSMObjectBuilder;
Area() :
OSMObject(sizeof(Area), osmium::item_type::area) {
}
public:
static constexpr osmium::item_type itemtype = osmium::item_type::area;
constexpr static bool is_compatible_to(osmium::item_type t) noexcept {
return t == itemtype;
}
bool from_way() const noexcept {
return (positive_id() & 0x1U) == 0;
}
osmium::object_id_type orig_id() const noexcept {
return osmium::area_id_to_object_id(id());
}
std::pair<size_t, size_t> num_rings() const {
std::pair<size_t, size_t> counter{0, 0};
for (const auto& item : *this) {
switch (item.type()) {
case osmium::item_type::outer_ring:
++counter.first;
break;
case osmium::item_type::inner_ring:
++counter.second;
break;
case osmium::item_type::tag_list:
// ignore tags
break;
case osmium::item_type::undefined:
case osmium::item_type::node:
case osmium::item_type::way:
case osmium::item_type::relation:
case osmium::item_type::area:
case osmium::item_type::changeset:
case osmium::item_type::way_node_list:
case osmium::item_type::relation_member_list:
case osmium::item_type::relation_member_list_with_full_members:
case osmium::item_type::changeset_discussion:
assert(false && "Children of Area can only be outer/inner_ring and tag_list.");
break;
}
}
return counter;
}
bool is_multipolygon() const {
return num_rings().first > 1;
}
osmium::memory::ItemIteratorRange<const osmium::OuterRing> outer_rings() const {
return subitems<const osmium::OuterRing>();
}
osmium::memory::ItemIteratorRange<const osmium::InnerRing> inner_rings(const osmium::OuterRing& outer) const {
const osmium::memory::ItemIteratorRange<const osmium::OuterRing> outer_range{outer.data(), next()};
return osmium::memory::ItemIteratorRange<const osmium::InnerRing>{outer_range.cbegin().data(), std::next(outer_range.cbegin()).data()};
}
osmium::Box envelope() const noexcept {
osmium::Box box;
for (const auto& ring : outer_rings()) {
box.extend(ring.envelope());
}
return box;
}
}; // class Area
} // namespace osmium
#endif // OSMIUM_OSM_AREA_HPP
box.hpp
osmium::Area::inner_rings
osmium::memory::ItemIteratorRange< const osmium::InnerRing > inner_rings(const osmium::OuterRing &outer) const
Definition area.hpp:223
osmium::Area::num_rings
std::pair< size_t, size_t > num_rings() const
Definition area.hpp:168
osmium::Area::is_compatible_to
static constexpr bool is_compatible_to(osmium::item_type t) noexcept
Definition area.hpp:138
osmium::Area::from_way
bool from_way() const noexcept
Definition area.hpp:148
osmium::Area::itemtype
static constexpr osmium::item_type itemtype
Definition area.hpp:136
osmium::Area::Area
Area()
Definition area.hpp:130
osmium::Area::outer_rings
osmium::memory::ItemIteratorRange< const osmium::OuterRing > outer_rings() const
Definition area.hpp:213
osmium::Area::envelope
osmium::Box envelope() const noexcept
Definition area.hpp:233
osmium::Area::is_multipolygon
bool is_multipolygon() const
Definition area.hpp:204
osmium::Area::orig_id
osmium::object_id_type orig_id() const noexcept
Definition area.hpp:157
osmium::InnerRing::itemtype
static constexpr osmium::item_type itemtype
Definition area.hpp:84
osmium::InnerRing::InnerRing
InnerRing()
Definition area.hpp:90
osmium::InnerRing::is_compatible_to
static constexpr bool is_compatible_to(osmium::item_type t) noexcept
Definition area.hpp:86
osmium::NodeRefList::NodeRefList
NodeRefList(osmium::item_type itemtype) noexcept
Definition node_ref_list.hpp:65
osmium::OSMObject::OSMObject
OSMObject(osmium::memory::item_size_type size, osmium::item_type type)
Definition object.hpp:102
osmium::OSMObject::positive_id
unsigned_object_id_type positive_id() const noexcept
Get absolute value of the ID of this object.
Definition object.hpp:123
osmium::OSMObject::subitems
osmium::memory::ItemIteratorRange< T > subitems()
Definition object.hpp:415
osmium::OuterRing
Definition area.hpp:60
osmium::OuterRing::itemtype
static constexpr osmium::item_type itemtype
Definition area.hpp:64
osmium::OuterRing::OuterRing
OuterRing()
Definition area.hpp:70
osmium::OuterRing::is_compatible_to
static constexpr bool is_compatible_to(osmium::item_type t) noexcept
Definition area.hpp:66
osmium::builder::OSMObjectBuilder
Definition osm_object_builder.hpp:428
osmium::memory::CollectionIterator::data
unsigned char * data() const noexcept
Definition collection.hpp:92
osmium::memory::ItemIteratorRange
Definition item_iterator.hpp:175
osmium::memory::ItemIteratorRange::cbegin
const_iterator cbegin() const noexcept
Definition item_iterator.hpp:203
osmium::memory::Item::next
unsigned char * next() noexcept
Definition item.hpp:155
collection.hpp
item.hpp
item_iterator.hpp
item_type.hpp
osmium::area
Code related to the building of areas (multipolygons) from relations.
Definition assembler.hpp:55
osmium::builder
Classes for building OSM objects and other items in buffers.
Definition attr.hpp:62
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::object_id_to_area_id
osmium::object_id_type object_id_to_area_id(osmium::object_id_type id, osmium::item_type type) noexcept
Definition area.hpp:104
osmium::item_type
item_type
Definition item_type.hpp:45
osmium::item_type::tag_list
@ tag_list
Definition item_type.hpp:53
osmium::item_type::relation_member_list
@ relation_member_list
Definition item_type.hpp:55
osmium::item_type::way_node_list
@ way_node_list
Definition item_type.hpp:54
osmium::item_type::changeset_discussion
@ changeset_discussion
Definition item_type.hpp:59
osmium::item_type::relation_member_list_with_full_members
@ relation_member_list_with_full_members
Definition item_type.hpp:56
osmium::item_type::relation
@ relation
Definition item_type.hpp:50
osmium::item_type::node
@ node
Definition item_type.hpp:48
osmium::item_type::changeset
@ changeset
Definition item_type.hpp:52
osmium::item_type::area
@ area
Definition item_type.hpp:51
osmium::item_type::undefined
@ undefined
Definition item_type.hpp:47
osmium::item_type::way
@ way
Definition item_type.hpp:49
osmium::item_type::outer_ring
@ outer_ring
Definition item_type.hpp:57
osmium::item_type::inner_ring
@ inner_ring
Definition item_type.hpp:58
osmium::object_id_type
int64_t object_id_type
Type for OSM object (node, way, or relation) IDs.
Definition types.hpp:45
osmium::area_id_to_object_id
osmium::object_id_type area_id_to_object_id(osmium::object_id_type id) noexcept
Definition area.hpp:118
node_ref_list.hpp
object.hpp
types.hpp