void Polygon::simplify(double distance_tolerance, double area_tolerance)
{
throwNoGeos();
auto deleteSmallRings = [area_tolerance](OGRGeometry *geom)
{
// Missing until GDAL 2.3.
// OGRPolygon *poly = geom->toPolygon();
OGRPolygon *poly = static_cast<OGRPolygon *>(geom);
std::vector<int> deleteRings;
for (int i = 0; i < poly->getNumInteriorRings(); ++i)
{
OGRLinearRing *lr = poly->getInteriorRing(i);
if (lr->get_Area() < area_tolerance)
deleteRings.push_back(i + 1);
}
// Note that interior rings are in a list with the exterior ring,
// which is why the ring numbers are offset by one when used in
// this context (what a mess).
for (auto i : deleteRings)
// Missing until 2.3
// poly->removeRing(i, true);
OGR_G_RemoveGeometry(gdal::toHandle(poly), i, true);
};
OGRGeometry *g = m_geom->SimplifyPreserveTopology(distance_tolerance);
m_geom.reset(g);
OGRwkbGeometryType t = m_geom->getGeometryType();
if (t == wkbPolygon || t == wkbPolygon25D)
deleteSmallRings(m_geom.get());
else if (t == wkbMultiPolygon || t == wkbMultiPolygon25D)
{
// Missing until 2.3
/**
OGRMultiPolygon *mpoly = m_geom->toMultiPolygon();
for (auto it = mpoly->begin(); it != mpoly->end(); ++it)
deleteSmallRings(*it);
**/
OGRMultiPolygon *mpoly = static_cast<OGRMultiPolygon *>(m_geom.get());
for (int i = 0; i < mpoly->getNumGeometries(); ++i)
deleteSmallRings(mpoly->getGeometryRef(i));
}
}
/*!
\brief Load geometry (polygon BUD/PAR layers)
\return number of invalid features
*/
int VFKDataBlockDB::LoadGeometryPolygon()
{
int nInvalidNoLines, nInvalidNoRings, nGeometries, nBridges;
int rowId, nCount, nCountMax;
size_t nLines;
GIntBig iFID;
bool bIsPar, bNewRing, bFound;
CPLString osSQL;
const char *vrColumn[2];
GUIntBig vrValue[2];
GUIntBig id, idOb;
sqlite3_stmt *hStmt;
VFKReaderDB *poReader;
VFKDataBlockDB *poDataBlockLines1, *poDataBlockLines2;
VFKFeatureDB *poFeature;
VFKFeatureDBList poLineList;
/* first is to be considered as exterior */
PointListArray poRingList;
std::vector<OGRLinearRing *> poLinearRingList;
OGRPolygon ogrPolygon;
OGRLinearRing *poOgrRing;
nInvalidNoLines = nInvalidNoRings = nGeometries = 0;
poReader = (VFKReaderDB*) m_poReader;
if (EQUAL (m_pszName, "PAR")) {
poDataBlockLines1 = (VFKDataBlockDB *) m_poReader->GetDataBlock("HP");
poDataBlockLines2 = poDataBlockLines1;
bIsPar = TRUE;
}
else {
poDataBlockLines1 = (VFKDataBlockDB *) m_poReader->GetDataBlock("OB");
poDataBlockLines2 = (VFKDataBlockDB *) m_poReader->GetDataBlock("SBP");
bIsPar = FALSE;
}
if (NULL == poDataBlockLines1) {
CPLError(CE_Warning, CPLE_FileIO,
"Data block %s not found. Unable to build geometry for %s.",
bIsPar ? "HP" : "OB", m_pszName);
return -1;
}
if (NULL == poDataBlockLines2) {
CPLError(CE_Warning, CPLE_FileIO,
"Data block %s not found. Unable to build geometry for %s.",
"SBP", m_pszName);
return -1;
}
poDataBlockLines1->LoadGeometry();
poDataBlockLines2->LoadGeometry();
if (LoadGeometryFromDB()) /* try to load geometry from DB */
return 0;
if (bIsPar) {
vrColumn[0] = "PAR_ID_1";
vrColumn[1] = "PAR_ID_2";
}
else {
vrColumn[0] = "OB_ID";
vrColumn[1] = "PORADOVE_CISLO_BODU";
vrValue[1] = 1;
}
osSQL.Printf("SELECT ID,%s,rowid FROM %s", FID_COLUMN, m_pszName);
if (poReader->IsSpatial())
poReader->ExecuteSQL("BEGIN");
std::vector<VFKDbValue> record;
record.push_back(VFKDbValue(DT_BIGINT));
record.push_back(VFKDbValue(DT_BIGINT));
record.push_back(VFKDbValue(DT_INT));
poReader->PrepareStatement(osSQL.c_str());
while(poReader->ExecuteSQL(record) == OGRERR_NONE) {
nBridges = 0;
/* read values */
id = static_cast<GIntBig> (record[0]);
iFID = static_cast<GIntBig> (record[1]);
rowId = static_cast<int> (record[2]);
poFeature = (VFKFeatureDB *) GetFeatureByIndex(rowId - 1);
CPLAssert(NULL != poFeature && poFeature->GetFID() == iFID);
if (bIsPar) {
vrValue[0] = vrValue[1] = id;
poLineList = poDataBlockLines1->GetFeatures(vrColumn, vrValue, 2);
}
else {
VFKFeatureDB *poLineSbp;
std::vector<VFKFeatureDB *> poLineListOb;
sqlite3_stmt *hStmtOb;
osSQL.Printf("SELECT ID FROM %s WHERE BUD_ID = " CPL_FRMT_GUIB,
poDataBlockLines1->GetName(), id);
if (poReader->IsSpatial()) {
CPLString osColumn;
osColumn.Printf(" AND %s IS NULL", GEOM_COLUMN);
osSQL += osColumn;
}
std::vector<VFKDbValue> record1;
record1.push_back(VFKDbValue(DT_BIGINT));
poReader->PrepareStatement(osSQL.c_str(), 1);
while(poReader->ExecuteSQL(record, 1) == OGRERR_NONE) {
idOb = static_cast<GIntBig> (record[0]);
vrValue[0] = idOb;
poLineSbp = poDataBlockLines2->GetFeature(vrColumn, vrValue, 2);
if (poLineSbp)
poLineList.push_back(poLineSbp);
}
}
nLines = poLineList.size();
if (nLines < 1) {
CPLDebug("OGR-VFK",
"%s: unable to collect rings for polygon fid = %ld (no lines)",
m_pszName, iFID);
nInvalidNoLines++;
continue;
}
/* clear */
ogrPolygon.empty();
poRingList.clear();
/* collect rings from lines */
bFound = FALSE;
nCount = 0;
nCountMax = static_cast<int>(nLines) * 2;
while (poLineList.size() > 0 && nCount < nCountMax) {
bNewRing = !bFound ? TRUE : FALSE;
bFound = FALSE;
int i = 1;
for (VFKFeatureDBList::iterator iHp = poLineList.begin(), eHp = poLineList.end();
iHp != eHp; ++iHp, ++i) {
const OGRLineString *pLine = (OGRLineString *) (*iHp)->GetGeometry();
if (pLine && AppendLineToRing(&poRingList, pLine, bNewRing)) {
bFound = TRUE;
poLineList.erase(iHp);
break;
}
}
nCount++;
}
CPLDebug("OGR-VFK", "%s: fid = %ld nlines = %d -> nrings = %d", m_pszName,
iFID, (int)nLines, (int)poRingList.size());
if (poLineList.size() > 0) {
CPLDebug("OGR-VFK",
"%s: unable to collect rings for polygon fid = %ld",
m_pszName, iFID);
nInvalidNoRings++;
continue;
}
/* build rings */
poLinearRingList.clear();
int i = 1;
for (PointListArray::const_iterator iRing = poRingList.begin(), eRing = poRingList.end();
iRing != eRing; ++iRing) {
OGRPoint *poPoint;
PointList *poList = *iRing;
poLinearRingList.push_back(new OGRLinearRing());
poOgrRing = poLinearRingList.back();
CPLAssert(NULL != poOgrRing);
for (PointList::iterator iPoint = poList->begin(), ePoint = poList->end();
iPoint != ePoint; ++iPoint) {
poPoint = &(*iPoint);
poOgrRing->addPoint(poPoint);
}
i++;
}
/* find exterior ring */
if (poLinearRingList.size() > 1) {
double dArea, dMaxArea;
std::vector<OGRLinearRing *>::iterator exteriorRing;
exteriorRing = poLinearRingList.begin();
dMaxArea = -1.;
for (std::vector<OGRLinearRing *>::iterator iRing = poLinearRingList.begin(),
eRing = poLinearRingList.end(); iRing != eRing; ++iRing) {
poOgrRing = *iRing;
if (!IsRingClosed(poOgrRing))
continue; /* skip unclosed rings */
dArea = poOgrRing->get_Area();
if (dArea > dMaxArea) {
dMaxArea = dArea;
exteriorRing = iRing;
}
}
if (exteriorRing != poLinearRingList.begin()) {
std::swap(*poLinearRingList.begin(), *exteriorRing);
}
}
/* build polygon from rings */
for (std::vector<OGRLinearRing *>::iterator iRing = poLinearRingList.begin(),
eRing = poLinearRingList.end(); iRing != eRing; ++iRing) {
poOgrRing = *iRing;
/* check if ring is closed */
if (IsRingClosed(poOgrRing)) {
ogrPolygon.addRing(poOgrRing);
}
else {
if (poOgrRing->getNumPoints() == 2) {
CPLDebug("OGR-VFK", "%s: Polygon (fid = %ld) bridge removed",
m_pszName, iFID);
nBridges++;
}
else {
CPLDebug("OGR-VFK",
"%s: Polygon (fid = %ld) unclosed ring skipped",
m_pszName, iFID);
}
}
delete poOgrRing;
*iRing = NULL;
}
/* set polygon */
ogrPolygon.setCoordinateDimension(2); /* force 2D */
if (ogrPolygon.getNumInteriorRings() + nBridges != (int) poLinearRingList.size() - 1 ||
!poFeature->SetGeometry(&ogrPolygon)) {
nInvalidNoRings++;
continue;
}
/* store also geometry in DB */
if (poReader->IsSpatial() &&
SaveGeometryToDB(&ogrPolygon, rowId) != OGRERR_FAILURE)
nGeometries++;
}
/* free ring list */
for (PointListArray::iterator iRing = poRingList.begin(), eRing = poRingList.end();
iRing != eRing; ++iRing) {
delete (*iRing);
*iRing = NULL;
}
CPLDebug("OGR-VFK", "%s: nolines = %d norings = %d",
m_pszName, nInvalidNoLines, nInvalidNoRings);
/* update number of geometries in VFK_DB_TABLE table */
UpdateVfkBlocks(nGeometries);
if (poReader->IsSpatial())
poReader->ExecuteSQL("COMMIT");
return nInvalidNoLines + nInvalidNoRings;
}
