/usr/include/osmium/osm/area.hpp is in libosmium-dev 0.0~20111213-g7f3500a-3build5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define OSMIUM_OSM_AREA_HPP
/*
Copyright 2011 Jochen Topf <jochen@topf.org> and others (see README).
This file is part of Osmium (https://github.com/joto/osmium).
Osmium is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License or (at your option) the GNU
General Public License as published by the Free Software Foundation, either
version 3 of the Licenses, or (at your option) any later version.
Osmium 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 and the GNU
General Public License for more details.
You should have received a copy of the Licenses along with Osmium. If not, see
<http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <vector>
#include <sstream>
#include <iomanip>
#include <map>
#ifdef OSMIUM_WITH_MULTIPOLYGON_PROFILING
# include <osmium/utils/timer.h>
# define START_TIMER(x) x##_timer.start();
# define STOP_TIMER(x) x##_timer.stop();
#else
# define START_TIMER(x)
# define STOP_TIMER(x)
#endif // OSMIUM_WITH_MULTIPOLYGON_PROFILING
#ifdef OSMIUM_WITH_GEOS
# include <geos/version.h>
# include <geos/geom/Geometry.h>
# include <geos/geom/Point.h>
# include <geos/geom/LineString.h>
# include <geos/geom/Polygon.h>
# include <geos/geom/PrecisionModel.h>
# include <geos/geom/CoordinateSequence.h>
# include <geos/geom/CoordinateArraySequenceFactory.h>
# include <geos/geom/LinearRing.h>
# include <geos/geom/Polygon.h>
# include <geos/geom/MultiPolygon.h>
# include <geos/geom/MultiLineString.h>
# include <geos/geom/prep/PreparedPolygon.h>
# include <geos/io/WKTWriter.h>
# include <geos/util/GEOSException.h>
# include <geos/opLinemerge.h>
# include <geos/operation/polygonize/Polygonizer.h>
# include <geos/operation/distance/DistanceOp.h>
# include <geos/opPolygonize.h>
# include <geos/algorithm/LineIntersector.h>
# include <geos/geomgraph/GeometryGraph.h>
# include <geos/geomgraph/index/SegmentIntersector.h>
// this should come from /usr/include/geos/algorithm, but its missing there in some Ubuntu versions
# include "../CGAlgorithms.h"
#endif // OSMIUM_WITH_GEOS
#ifdef OSMIUM_WITH_SHPLIB
# include <shapefil.h>
#endif // OSMIUM_WITH_SHPLIB
#include <osmium/osm/way.hpp>
#include <osmium/osm/relation.hpp>
#include <osmium/geometry.hpp>
namespace Osmium {
namespace OSM {
enum innerouter_t { UNSET, INNER, OUTER };
enum direction_t { NO_DIRECTION, CLOCKWISE, COUNTERCLOCKWISE };
#ifdef OSMIUM_WITH_GEOS
class WayInfo {
friend class AreaFromRelation;
Osmium::OSM::Way *way;
int used;
int sequence;
bool invert;
bool duplicate;
std::string errorhint;
innerouter_t innerouter;
innerouter_t orig_innerouter;
geos::geom::Geometry *way_geom;
int firstnode;
int lastnode;
bool tried;
WayInfo() {
way = NULL;
used = -1;
innerouter = UNSET;
orig_innerouter = UNSET;
sequence = 0;
invert = false;
duplicate = false;
way_geom = NULL;
firstnode = -1;
lastnode = -1;
tried = false;
}
WayInfo(Osmium::OSM::Way *w, innerouter_t io) {
way = w;
way_geom = w->create_geos_geometry();
orig_innerouter = io;
used = -1;
innerouter = UNSET;
sequence = 0;
invert = false;
duplicate = false;
tried = false;
firstnode = w->get_first_node_id();
lastnode = w->get_last_node_id();
}
/** Special version with a synthetic way, not backed by real way object. */
WayInfo(geos::geom::Geometry *g, int first, int last, innerouter_t io) {
way = NULL;
way_geom = g;
orig_innerouter = io;
used = -1;
innerouter = UNSET;
sequence = 0;
invert = false;
duplicate = false;
tried = false;
firstnode = first;
lastnode = last;
}
~WayInfo() {
delete way_geom;
}
geos::geom::Point *get_firstnode_geom() {
return (way ? way->get_first_node_geometry() : NULL);
}
geos::geom::Point *get_lastnode_geom() {
return (way ? way->get_last_node_geometry() : NULL);
}
};
class RingInfo {
friend class AreaFromRelation;
geos::geom::Polygon *polygon;
direction_t direction;
std::vector<WayInfo *> ways;
std::vector<RingInfo *> inner_rings;
bool nested;
RingInfo *contained_by;
int ring_id;
RingInfo() {
polygon = NULL;
direction = NO_DIRECTION;
nested = false;
contained_by = NULL;
ring_id = -1;
}
};
#endif // OSMIUM_WITH_GEOS
/// virtual parent class for AreaFromWay and AreaFromRelation
class Area : public Object {
protected:
#ifdef OSMIUM_WITH_GEOS
geos::geom::Geometry *geometry;
Area(geos::geom::Geometry *geom = NULL) : geometry(geom) {
#else
Area() {
#endif // OSMIUM_WITH_GEOS
# ifdef OSMIUM_WITH_JAVASCRIPT
v8::HandleScope handle_scope;
js_object_instance = v8::Persistent<v8::Object>::New(JavascriptTemplate::get<JavascriptTemplate>().create_instance(this));
# endif // OSMIUM_WITH_JAVASCRIPT
}
~Area() {
#ifdef OSMIUM_WITH_GEOS
delete(geometry);
#endif // OSMIUM_WITH_GEOS
}
public:
#ifdef OSMIUM_WITH_GEOS
geos::geom::Geometry* get_geometry() const {
return geometry;
}
#endif // OSMIUM_WITH_GEOS
#ifdef OSMIUM_WITH_JAVASCRIPT
v8::Handle<v8::Value> js_from() const {
const char *value = (get_type() == AREA_FROM_WAY) ? "way" : "relation";
return v8::String::NewSymbol(value);
}
v8::Handle<v8::Value> js_geom() const;
struct JavascriptTemplate : public Osmium::OSM::Object::JavascriptTemplate {
JavascriptTemplate() : Osmium::OSM::Object::JavascriptTemplate() {
js_template->SetAccessor(v8::String::NewSymbol("from"), accessor_getter<Area, &Area::js_from>);
js_template->SetAccessor(v8::String::NewSymbol("geom"), accessor_getter<Area, &Area::js_geom>);
}
};
#endif // OSMIUM_WITH_JAVASCRIPT
}; // class Area
/***
* Area created from a way.
* The way pointer given to the constructor will not be stored, all
* needed attributes are copied.
*/
class AreaFromWay : public Area {
public:
WayNodeList m_node_list;
#ifdef OSMIUM_WITH_GEOS
AreaFromWay(Way* way, geos::geom::Geometry* geom) : Area(geom) {
#else
AreaFromWay(Way* way) : Area() {
#endif // OSMIUM_WITH_GEOS
id(way->id());
version(way->version());
changeset(way->changeset());
timestamp(way->timestamp());
uid(way->uid());
user(way->user());
tags(way->tags());
m_node_list = way->nodes();
}
~AreaFromWay() {
}
const WayNodeList& nodes() const {
return m_node_list;
}
WayNodeList& nodes() {
return m_node_list;
}
osm_object_type_t get_type() const {
return AREA_FROM_WAY;
}
}; // class AreaFromWay
/***
* Area created from a relation with tag type=multipolygon or type=boundary
*/
class AreaFromRelation : public Area {
bool boundary; ///< was this area created from relation with tag type=boundary?
/// the relation this area was build from
Relation *relation;
/// the member ways of this area
std::vector<Osmium::OSM::Way> member_ways;
/// number of ways in this area
int num_ways;
/// how many ways are missing before we can build the multipolygon
int missing_ways;
std::string geometry_error_message;
/// callback we should call when a multipolygon was completed
void (*callback)(Osmium::OSM::Area*);
/// whether we want to repair a broken geometry
bool attempt_repair;
bool ignore_tag(const std::string &s) {
if (s=="type") return true;
if (s=="created_by") return true;
if (s=="source") return true;
if (s=="note") return true;
return false;
}
bool same_tags(const Object* a, const Object* b) {
if ((a == NULL) || (b == NULL)) return false;
const TagList& at = a->tags();
const TagList& bt = b->tags();
std::map<std::string, std::string> aTags;
TagList::const_iterator end = at.end();
for (TagList::const_iterator it = at.begin(); it != end; ++it) {
if (ignore_tag(it->key())) continue;
aTags[it->key()] = it->value();
}
end = bt.end();
for (TagList::const_iterator it = bt.begin(); it != end; ++it) {
if (ignore_tag(it->key())) continue;
if (aTags[it->key()] != it->value()) return false;
aTags.erase(it->key());
}
if (!aTags.empty()) return false;
return true;
}
/** returns false if there was a collision, true otherwise */
bool merge_tags(Object* a, const Object* b) {
bool rv = true;
TagList& at = a->tags();
const TagList& bt = b->tags();
std::map<std::string, std::string> aTags;
TagList::const_iterator end = at.end();
for (TagList::const_iterator it = at.begin(); it != end; ++it) {
if (ignore_tag(it->key())) continue;
aTags[it->key()] = it->value();
}
end = bt.end();
for (TagList::const_iterator it = bt.begin(); it != end; ++it) {
if (ignore_tag(it->key())) continue;
if (aTags.find(it->key()) != aTags.end()) {
if (aTags[it->key()] != it->value()) rv = false;
} else {
at.add(it->key(), it->value());
aTags[it->key()] = it->value();
}
}
return rv;
}
bool untagged(const Object* r) {
if (r == NULL) return true;
const TagList& tags = r->tags();
if (tags.empty()) return true;
TagList::const_iterator end = tags.end();
for (TagList::const_iterator it = tags.begin(); it != end; ++it) {
if (! ignore_tag(it->key()) ) {
return false;
}
}
return true;
}
public:
AreaFromRelation(Relation* r, bool b, int n, void (*callback)(Osmium::OSM::Area*), bool repair) : Area(), boundary(b), relation(r), callback(callback) {
num_ways = n;
missing_ways = n;
#ifdef OSMIUM_WITH_GEOS
geometry = NULL;
#endif // OSMIUM_WITH_GEOS
id(r->id());
attempt_repair = repair;
}
#ifdef OSMIUM_WITH_MULTIPOLYGON_PROFILING
static std::vector<std::pair<std::string, timer *> > timers;
static timer write_complex_poly_timer;
static timer assemble_ways_timer;
static timer assemble_nodes_timer;
static timer make_one_ring_timer;
static timer mor_polygonizer_timer;
static timer mor_union_timer;
static timer contains_timer;
static timer extra_polygons_timer;
static timer polygon_build_timer;
static timer inner_ring_touch_timer;
static timer polygon_intersection_timer;
static timer multipolygon_build_timer;
static timer multipolygon_write_timer;
static timer error_write_timer;
static void init_timings() {
timers.push_back(std::pair<std::string, timer *> (" thereof assemble_ways", &assemble_ways_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof make_one_ring", &make_one_ring_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof union", &mor_union_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof polygonizer", &mor_polygonizer_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof contains", &contains_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof extra_polygons", &extra_polygons_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof polygon_build", &polygon_build_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof inner_ring_touch", &inner_ring_touch_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof intersections", &polygon_intersection_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof multipolygon_build", &multipolygon_build_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof multipolygon_write", &multipolygon_write_timer));
timers.push_back(std::pair<std::string, timer *> (" thereof error_write", &error_write_timer));
}
static void print_timings() {
for (unsigned int i=0; i<timers.size(); i++) {
std::cerr << timers[i].first << ": " << *(timers[i].second) << std::endl;
}
}
#endif // OSMIUM_WITH_MULTIPOLYGON_PROFILING
~AreaFromRelation() {
delete relation;
member_ways.erase(member_ways.begin(), member_ways.end());
}
osm_object_type_t get_type() const {
return AREA_FROM_RELATION;
}
/// Add way to list of member ways. This will create a copy of the way.
void add_member_way(Osmium::OSM::Way *way) {
member_ways.push_back(*way);
missing_ways--;
}
/// Do we have all the ways we need to build the multipolygon?
bool is_complete() {
return missing_ways == 0;
}
void handle_complete_multipolygon() {
#ifdef OSMIUM_WITH_GEOS
if (! build_geometry()) {
std::cerr << " geom build error: " << geometry_error_message << "\n";
}
#endif // OSMIUM_WITH_GEOS
callback(this);
}
private:
/**
* This helper gets called when we find a ring that is not valid -
* usually because it self-intersects. The method tries to salvage
* as much of the ring as possible, using binary search to find the
* bit that needs to be cut out. It then returns a valid LinearRing,
* or NULL if none can be built.
*
* There is massive potential for improvement here. The biggest
* limitation is that this method does not deliver results for
* linear rings with more than one self-intersection.
*/
#ifdef OSMIUM_WITH_GEOS
geos::geom::LinearRing *create_non_intersecting_linear_ring(geos::geom::CoordinateSequence *orig_cs) {
const std::vector<geos::geom::Coordinate>* coords = orig_cs->toVector();
int inv = coords->size();
int val = 0;
int current = (inv + val) / 2;
bool simple;
// find the longest non-intersecting stretch from the beginning
// of the way.
while (1) {
std::vector<geos::geom::Coordinate> *vv = new std::vector<geos::geom::Coordinate>(coords->begin(), coords->begin() + current);
geos::geom::CoordinateSequence *cs = geos::geom::CoordinateArraySequenceFactory::instance()->create(vv);
geos::geom::LineString *a = Osmium::Geometry::geos_geometry_factory()->createLineString(cs);
if (!(simple = a->isSimple())) {
inv = current;
} else {
val = current;
}
delete a;
if (current == (inv+val)/2) break;
current = (inv + val) / 2;
}
if (!simple) current--;
unsigned int cutoutstart = current;
inv = 0;
val = coords->size();
current = (inv + val) / 2;
// find the longest non-intersecting stretch from the end
// of the way. Note that this is likely to overlap with the
// stretch found above - assume a 10-node way where nodes 3
// and 7 are identical, then we will find the sequence 0..6
// above, and 4..9 here!
while (1) {
std::vector<geos::geom::Coordinate> *vv = new std::vector<geos::geom::Coordinate>(coords->begin() + current, coords->end());
geos::geom::CoordinateSequence *cs = geos::geom::CoordinateArraySequenceFactory::instance()->create(vv);
geos::geom::LineString *a = Osmium::Geometry::geos_geometry_factory()->createLineString(cs);
if (!(simple = a->isSimple())) {
inv = current;
} else {
val = current;
}
delete a;
if (current == (inv+val)/2) break;
current = (inv + val) / 2;
}
if (!simple) current++;
unsigned int cutoutend = current;
// assemble a new linear ring by cutting out the problematic bit.
// if the "problematic bit" however is longer than half the way,
// then try using the "problematic bit" by itself.
std::vector<geos::geom::Coordinate> *vv = new std::vector<geos::geom::Coordinate>();
if (cutoutstart < cutoutend) {
unsigned int t = cutoutstart;
cutoutstart = cutoutend;
cutoutend = t;
}
if (cutoutstart-cutoutend > coords->size() / 2) {
vv->insert(vv->end(), coords->begin() + cutoutend, coords->begin() + cutoutstart);
vv->insert(vv->end(), vv->at(0));
} else {
vv->insert(vv->end(), coords->begin(), coords->begin() + cutoutend);
vv->insert(vv->end(), coords->begin() + cutoutstart, coords->end());
}
geos::geom::CoordinateSequence *cs = geos::geom::CoordinateArraySequenceFactory::instance()->create(vv);
geos::geom::LinearRing *a = Osmium::Geometry::geos_geometry_factory()->createLinearRing(cs);
// if this results in a valid ring, return it; else return NULL.
if (!a->isValid()) return NULL;
geos::geom::LinearRing *b = dynamic_cast<geos::geom::LinearRing *>(a->clone());
//delete a;
return b;
}
/**
* Tries to collect 1...n ways from the n ways in the given list so that
* they form a closed ring. If this is possible, flag those as being used
* by ring #ringcount in the way list and return the geometry. (The method
* may be called again to find further rings.) If this is not possible,
* return NULL.
*/
RingInfo *make_one_ring(std::vector<WayInfo *> &ways, osm_object_id_t first, osm_object_id_t last, int ringcount, int sequence) {
// have we found a loop already?
if (first && first == last) {
geos::geom::CoordinateSequence *cs = geos::geom::CoordinateArraySequenceFactory::instance()->create((size_t)0, (size_t)0);
geos::geom::LinearRing *lr = NULL;
try {
START_TIMER(mor_polygonizer);
WayInfo **sorted_ways = new WayInfo*[sequence];
for (unsigned int i=0; i<ways.size(); i++) {
if (ways[i]->used == ringcount) {
sorted_ways[ways[i]->sequence] = ways[i];
}
}
for (int i=0; i<sequence; i++) {
cs->add(dynamic_cast<geos::geom::LineString *>(sorted_ways[i]->way_geom)->getCoordinatesRO(), false, !sorted_ways[i]->invert);
}
delete[] sorted_ways;
lr = Osmium::Geometry::geos_geometry_factory()->createLinearRing(cs);
STOP_TIMER(mor_polygonizer);
if (!lr->isSimple() || !lr->isValid()) {
//delete lr;
lr = NULL;
if (attempt_repair) {
lr = create_non_intersecting_linear_ring(cs);
if (lr) {
if (Osmium::debug())
std::cerr << "successfully repaired an invalid ring" << std::endl;
}
}
if (!lr) return NULL;
}
bool ccw = geos::algorithm::CGAlgorithms::isCCW(lr->getCoordinatesRO());
RingInfo *rl = new RingInfo();
rl->direction = ccw ? COUNTERCLOCKWISE : CLOCKWISE;
rl->polygon = Osmium::Geometry::geos_geometry_factory()->createPolygon(lr, NULL);
return rl;
} catch (const geos::util::GEOSException& exc) {
if (Osmium::debug())
std::cerr << "Exception: " << exc.what() << std::endl;
return NULL;
}
}
// have we not allocated anything yet, then simply start with first available way,
// or return NULL if all are taken.
if (!first) {
for (unsigned int i=0; i<ways.size(); i++) {
if (ways[i]->used != -1) continue;
ways[i]->used = ringcount;
ways[i]->sequence = 0;
ways[i]->invert = false;
RingInfo *rl = make_one_ring(ways, ways[i]->firstnode, ways[i]->lastnode, ringcount, 1);
if (rl) {
rl->ways.push_back(ways[i]);
return rl;
}
ways[i]->used = -2;
break;
}
return NULL;
}
// try extending our current line at the rear end
// since we are looking for a LOOP, no sense to try extending it at both ends
// as we'll eventually get there anyway!
for (unsigned int i=0; i<ways.size(); i++) {
if (ways[i]->used < 0) ways[i]->tried = false;
}
for (unsigned int i=0; i<ways.size(); i++) {
// ignore used ways
if (ways[i]->used >= 0) continue;
if (ways[i]->tried) continue;
ways[i]->tried = true;
int old_used = ways[i]->used;
if (ways[i]->firstnode == last) {
// add way to end
ways[i]->used = ringcount;
ways[i]->sequence = sequence;
ways[i]->invert = false;
RingInfo *result = make_one_ring(ways, first, ways[i]->lastnode, ringcount, sequence+1);
if (result) {
result->ways.push_back(ways[i]);
return result;
}
ways[i]->used = old_used;
} else if (ways[i]->lastnode == last) {
// add way to end, but turn it around
ways[i]->used = ringcount;
ways[i]->sequence = sequence;
ways[i]->invert = true;
RingInfo *result = make_one_ring(ways, first, ways[i]->firstnode, ringcount, sequence+1);
if (result) {
result->ways.push_back(ways[i]);
return result;
}
ways[i]->used = old_used;
}
}
// we have exhausted all combinations.
return NULL;
}
/**
* Checks if there are any dangling ends, and connects them to the
* nearest other dangling end with a straight line. This could
* conceivably introduce intersections, but it's the best we can
* do.
*
* Returns true on success.
*
* (This implementation always succeeds because it is impossible for
* there to be only one dangling end in a collection of lines.)
*/
bool find_and_repair_holes_in_rings(std::vector<WayInfo *> *ways) {
// collect the remaining debris (=unused ways) and find dangling nodes.
std::map<int,geos::geom::Point *> dangling_node_map;
for (std::vector<WayInfo *>::iterator i(ways->begin()); i != ways->end(); i++) {
if ((*i)->used < 0) {
(*i)->innerouter = UNSET;
(*i)->used = -1;
for (int j=0; j<2; j++) {
int nid = j ? (*i)->firstnode : (*i)->lastnode;
if (dangling_node_map[nid]) {
delete dangling_node_map[nid];
dangling_node_map[nid] = NULL;
} else {
dangling_node_map[nid] = j ? (*i)->get_firstnode_geom() : (*i)->get_lastnode_geom();
}
}
}
}
do {
int mindist_id = 0;
double mindist = -1;
int node1_id = 0;
geos::geom::Point *node1 = NULL;
geos::geom::Point *node2 = NULL;
// find one pair consisting of a random node from the list (node1)
// plus the node that lies closest to it.
for (std::map<int,geos::geom::Point *>::iterator i(dangling_node_map.begin()); i!= dangling_node_map.end(); i++) {
if (!i->second) continue;
if (node1 == NULL) {
node1 = i->second;
node1_id = i->first;
i->second = NULL;
mindist = -1;
} else {
# if GEOS_VERSION_MAJOR < 3 || (GEOS_VERSION_MAJOR == 3 && GEOS_VERSION_MINOR <= 2)
double dist = geos::operation::distance::DistanceOp::distance(node1, (i->second)); // deprecated in newer version of GEOS
# else
double dist = geos::operation::distance::DistanceOp::distance(*node1, *(i->second));
# endif
if ((dist < mindist) || (mindist < 0)) {
mindist = dist;
mindist_id = i->first;
}
}
}
// if such a pair has been found, synthesize a connecting way.
if (node1 && mindist > -1) {
// if we find that there are dangling nodes but aren't
// repairing - break out.
if (!attempt_repair) return false;
// drop node2 from dangling map
node2 = dangling_node_map[mindist_id];
dangling_node_map[mindist_id] = NULL;
std::vector<geos::geom::Coordinate> *c = new std::vector<geos::geom::Coordinate>;
c->push_back(*(node1->getCoordinate()));
c->push_back(*(node2->getCoordinate()));
geos::geom::CoordinateSequence *cs = Osmium::Geometry::geos_geometry_factory()->getCoordinateSequenceFactory()->create(c);
geos::geom::Geometry *geometry = (geos::geom::Geometry *) Osmium::Geometry::geos_geometry_factory()->createLineString(cs);
ways->push_back(new WayInfo(geometry, node1_id, mindist_id, UNSET));
if (Osmium::debug())
std::cerr << "fill gap between nodes " << node1_id << " and " << mindist_id << std::endl;
} else {
break;
}
} while (1);
return true;
}
/**
* Tries to build a multipolygon from the given relation.
*
*/
bool build_geometry() {
std::vector<WayInfo *> ways;
// the timestamp of the multipolygon will be the maximum of the timestamp from the relation and from all member ways
timestamp(relation->timestamp());
// assemble all ways which are members of this relation into a
// vector of WayInfo elements. this holds room for the way pointer
// and some extra flags.
START_TIMER(assemble_ways);
for (std::vector<Way>::iterator i(member_ways.begin()); i != member_ways.end(); i++) {
if (i->timestamp() > timestamp()) {
timestamp(i->timestamp());
}
WayInfo *wi = new WayInfo(&(*i), UNSET);
if (wi->way_geom) {
geos::io::WKTWriter wkt;
} else {
delete wi;
return geometry_error("invalid way geometry in multipolygon relation member");
}
ways.push_back(wi);
// TODO drop duplicate ways automatically in repair mode?
// TODO maybe add INNER/OUTER instead of UNSET to enable later warnings on role mismatch
}
STOP_TIMER(assemble_ways);
std::vector<RingInfo *> ringlist;
// convenience defines to aid in clearing up on error return.
#define clear_ringlist() \
for (std::vector<RingInfo *>::const_iterator rli(ringlist.begin()); rli != ringlist.end(); rli++) delete *rli;
#define clear_wayinfo() \
for (std::vector<WayInfo *>::const_iterator win(ways.begin()); win != ways.end(); win++) delete *win;
// try and create as many closed rings as possible from the assortment
// of ways. make_one_ring will automatically flag those that have been
// used so they are not used again.
do {
START_TIMER(make_one_ring);
RingInfo *r = make_one_ring(ways, 0, 0, ringlist.size(), 0);
STOP_TIMER(make_one_ring);
if (r == NULL) break;
r->ring_id = ringlist.size();
ringlist.push_back(r);
} while (1);
if (ringlist.empty()) {
// FIXME return geometry_error("no rings");
}
if (!find_and_repair_holes_in_rings(&ways)) {
clear_ringlist();
clear_wayinfo();
return geometry_error("un-connectable dangling ends");
}
// re-run ring building, taking into account the newly created "repair" bits.
// (in case there were no dangling bits, make_one_ring terminates quickly.)
do {
START_TIMER(make_one_ring);
RingInfo *r = make_one_ring(ways, 0, 0, ringlist.size(), 0);
STOP_TIMER(make_one_ring);
if (r == NULL) break;
r->ring_id = ringlist.size();
ringlist.push_back(r);
} while (1);
if (ringlist.empty()) {
clear_ringlist();
clear_wayinfo();
return geometry_error("no rings");
}
std::vector<geos::geom::Geometry *> *polygons = new std::vector<geos::geom::Geometry *>();
geos::geom::MultiPolygon *mp = NULL;
// find out which ring contains which other ring, so we know
// which are inner rings and which outer. don't trust the "role"
// specifications.
START_TIMER(contains);
bool **contains = new bool*[ringlist.size()];
bool *contained_by_even_number = new bool[ringlist.size()];
// reset array
for (unsigned int i=0; i<ringlist.size(); i++) {
contains[i] = new bool[ringlist.size()];
contained_by_even_number[i] = true;
for (unsigned int j=0; j<ringlist.size(); j++) {
contains[i][j] = false;
}
}
// build contains relationships.
// we use contained_by_even_number as a helper for us to determine
// whether something is an inner (false) or outer (true) ring.
for (unsigned int i=0; i<ringlist.size(); i++) {
const geos::geom::prep::PreparedPolygon *pp = new geos::geom::prep::PreparedPolygon(ringlist[i]->polygon);
for (unsigned int j=0; j<ringlist.size(); j++) {
if (i==j) continue;
if (contains[j][i]) continue;
contains[i][j] = pp->contains(ringlist[j]->polygon);
contained_by_even_number[j] ^= contains[i][j];
}
delete pp;
}
// we now have an array that has a true value whenever something is
// contained by something else; if a contains b and b contains c, then
// our array says that a contains b, b contains c, and a contains c.
// thin out the array so that only direct relationships remain (and
// the "a contains c" is dropped).
for (unsigned int i=0; i<ringlist.size(); i++) {
for (unsigned j=0; j<ringlist.size(); j++) {
if (contains[i][j]) {
// see if there is an intermediary relationship
for (unsigned int k=0; k<ringlist.size(); k++) {
if (k==i) continue;
if (k==j) continue;
if (contains[i][k] && contains[k][j]) {
// intermediary relationship exists; break this
// one up.
contains[i][j] = false;
ringlist[j]->nested = true;
break;
}
}
}
}
}
// populate the "inner_rings" list and the "contained_by" pointer
// in the ring list based on the data collected. the "contains"
// array can be thrown away afterwards.
for (unsigned int i=0; i<ringlist.size(); i++) {
for (unsigned int j=0; j<ringlist.size(); j++) {
if (contains[i][j] && !contained_by_even_number[j]) {
ringlist[j]->contained_by = ringlist[i];
ringlist[i]->inner_rings.push_back(ringlist[j]);
}
}
delete[] contains[i];
}
delete[] contains;
delete[] contained_by_even_number;
STOP_TIMER(contains);
// now look at all enclosed (inner) rings that consist of only one way.
// if such an inner ring has way tags, do the following:
// * emit an extra polygon for the inner ring if the tags are different
// from the relation's
// * emit a warning, and ignore the inner ring, if the tags are the same
// as for the relation
START_TIMER(extra_polygons);
for (unsigned int i=0; i<ringlist.size(); i++) {
if (ringlist[i]->contained_by) {
if (ringlist[i]->ways.size() == 1 && !untagged(ringlist[i]->ways[0]->way)) {
std::vector<geos::geom::Geometry *> *g = new std::vector<geos::geom::Geometry *>;
if (ringlist[i]->direction == CLOCKWISE) {
g->push_back(ringlist[i]->polygon->clone());
} else {
geos::geom::LineString *tmp = dynamic_cast<geos::geom::LineString *>(ringlist[i]->polygon->getExteriorRing()->reverse());
geos::geom::LinearRing *reversed_ring =
Osmium::Geometry::geos_geometry_factory()->createLinearRing(tmp->getCoordinates());
delete tmp;
g->push_back(Osmium::Geometry::geos_geometry_factory()->createPolygon(reversed_ring, NULL));
}
geos::geom::MultiPolygon *special_mp = Osmium::Geometry::geos_geometry_factory()->createMultiPolygon(g);
if (same_tags(ringlist[i]->ways[0]->way, relation)) {
// warning
// warnings.insert("duplicate_tags_on_inner");
} else if (ringlist[i]->contained_by->ways.size() == 1 && same_tags(ringlist[i]->ways[0]->way, ringlist[i]->contained_by->ways[0]->way)) {
// warning
// warnings.insert("duplicate_tags_on_inner");
} else {
Osmium::OSM::AreaFromWay *internal_mp =
new Osmium::OSM::AreaFromWay(ringlist[i]->ways[0]->way, special_mp);
callback(internal_mp);
delete internal_mp;
// AreaFromWay destructor deletes the
// geometry, so avoid to delete it again.
special_mp = NULL;
}
delete special_mp;
}
}
}
STOP_TIMER(extra_polygons);
// for all non-enclosed rings, assemble holes and build polygon.
START_TIMER(polygon_build)
for (unsigned int i=0; i<ringlist.size(); i++) {
// look only at outer, i.e. non-contained rings. each ends up as one polygon.
if (ringlist[i] == NULL) continue; // can happen if ring has been deleted
if (ringlist[i]->contained_by) continue;
std::vector<geos::geom::Geometry *> *holes = new std::vector<geos::geom::Geometry *>(); // ownership is later transferred to polygon
START_TIMER(inner_ring_touch)
for (int j=0; j<((int)ringlist[i]->inner_rings.size()-1); j++) {
if (!ringlist[i]->inner_rings[j]->polygon) continue;
geos::geom::LinearRing *ring = (geos::geom::LinearRing *) ringlist[i]->inner_rings[j]->polygon->getExteriorRing();
// check if some of the rings touch another ring.
for (unsigned int k=j + 1; k<ringlist[i]->inner_rings.size(); k++) {
if (!ringlist[i]->inner_rings[k]->polygon) continue;
const geos::geom::Geometry *compare = ringlist[i]->inner_rings[k]->polygon->getExteriorRing();
geos::geom::Geometry *inter = NULL;
try {
if (!ring->intersects(compare)) continue;
inter = ring->intersection(compare);
} catch (const geos::util::GEOSException& exc) {
// nop;
}
if (inter && (inter->getGeometryTypeId() == geos::geom::GEOS_LINESTRING || inter->getGeometryTypeId() == geos::geom::GEOS_MULTILINESTRING)) {
// touching inner rings
// this is allowed, but we must fix them up into a valid
// geometry
geos::geom::Geometry *diff = ring->symDifference(compare);
geos::operation::polygonize::Polygonizer *p = new geos::operation::polygonize::Polygonizer();
p->add(diff);
std::vector<geos::geom::Polygon*>* polys = p->getPolygons();
if (polys && polys->size() == 1) {
ringlist[i]->inner_rings[j]->polygon = polys->at(0);
bool ccw = geos::algorithm::CGAlgorithms::isCCW(polys->at(0)->getExteriorRing()->getCoordinatesRO());
ringlist[i]->inner_rings[j]->direction = ccw ? COUNTERCLOCKWISE : CLOCKWISE;
ringlist[i]->inner_rings[k]->polygon = NULL;
j=-1;
break;
}
} else {
// other kind of intersect between inner rings; this is
// not allwoed and will lead to an exception later when
// building the MP
}
}
}
STOP_TIMER(inner_ring_touch)
for (unsigned int j=0; j<ringlist[i]->inner_rings.size(); j++) {
if (!ringlist[i]->inner_rings[j]->polygon) continue;
geos::geom::LinearRing *ring = (geos::geom::LinearRing *) ringlist[i]->inner_rings[j]->polygon->getExteriorRing();
if (ringlist[i]->inner_rings[j]->direction == CLOCKWISE) {
// reverse ring
geos::geom::LineString *tmp = dynamic_cast<geos::geom::LineString *>(ring->reverse());
geos::geom::LinearRing *reversed_ring =
Osmium::Geometry::geos_geometry_factory()->createLinearRing(tmp->getCoordinates());
delete tmp;
holes->push_back(reversed_ring);
} else {
holes->push_back(ring);
}
}
geos::geom::LinearRing *ring = (geos::geom::LinearRing *) ringlist[i]->polygon->getExteriorRing();
if (ringlist[i]->direction == COUNTERCLOCKWISE) {
geos::geom::LineString *tmp = dynamic_cast<geos::geom::LineString *>(ring->reverse());
geos::geom::LinearRing *reversed_ring = Osmium::Geometry::geos_geometry_factory()->createLinearRing(tmp->getCoordinates());
ring = reversed_ring;
delete tmp;
} else {
ring = dynamic_cast<geos::geom::LinearRing *>(ring->clone());
}
delete ringlist[i]->polygon;
ringlist[i]->polygon = NULL;
geos::geom::Polygon *p = NULL;
bool valid = false;
try {
p = Osmium::Geometry::geos_geometry_factory()->createPolygon(ring, holes);
if (p) valid = p->isValid();
} catch (const geos::util::GEOSException& exc) {
// nop
if (Osmium::debug())
std::cerr << "Exception during creation of polygon for relation #" << relation->id() << ": " << exc.what() << " (treating as invalid polygon)" << std::endl;
}
if (!valid) {
// polygon is invalid.
clear_ringlist();
clear_wayinfo();
if (p) delete p;
else delete ring;
return geometry_error("invalid ring");
} else {
polygons->push_back(p);
for (unsigned int k=0; k<ringlist[i]->ways.size(); k++) {
WayInfo *wi = ringlist[i]->ways[k];
// may have "hole filler" ways in there, not backed by
// proper way and thus no tags:
if (wi->way == NULL) continue;
if (untagged(wi->way)) {
// way not tagged - ok
} else if (same_tags(relation, wi->way)) {
// way tagged the same as relation/previous ways, ok
} else if (untagged(relation)) {
// relation untagged; use tags from way; ok
merge_tags(relation, wi->way);
}
wi->innerouter = OUTER;
if (wi->orig_innerouter == INNER && wi->errorhint.empty()) {
// warning: inner/outer mismatch
}
}
// copy tags from relation into area
tags(relation->tags());
}
// later delete ringlist[i];
// ringlist[i] = NULL;
}
STOP_TIMER(polygon_build);
clear_ringlist();
clear_wayinfo();
if (polygons->empty()) {
return geometry_error("no rings");
}
START_TIMER(multipolygon_build);
bool valid = false;
try {
mp = Osmium::Geometry::geos_geometry_factory()->createMultiPolygon(polygons);
valid = mp->isValid();
} catch (const geos::util::GEOSException& exc) {
// nop
};
STOP_TIMER(multipolygon_build);
if (valid) {
geometry = mp;
return true;
}
return geometry_error("multipolygon invalid");
}
bool geometry_error(const char *message) {
geometry_error_message = message;
if (Osmium::debug()) {
std::cerr << "building mp failed: " << geometry_error_message << std::endl;
}
geometry = NULL;
return false;
}
#endif // OSMIUM_WITH_GEOS
}; // class AreaFromRelation
} // namespace OSM
} // namespace Osmium
#endif // OSMIUM_OSM_AREA_HPP
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