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/******************************************************************************
*
* Project: FlatGeobuf driver
* Purpose: Implements GeometryWriter class.
* Author: Björn Harrtell <bjorn at wololo dot org>
*
******************************************************************************
* Copyright (c) 2018-2019, Björn Harrtell <bjorn at wololo dot org>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "geometrywriter.h"
using namespace flatbuffers;
using namespace FlatGeobuf;
using namespace ogr_flatgeobuf;
GeometryType
GeometryWriter::translateOGRwkbGeometryType(const OGRwkbGeometryType eGType)
{
const auto flatType = wkbFlatten(eGType);
GeometryType geometryType = GeometryType::Unknown;
if (flatType <= 17)
geometryType = (GeometryType)flatType;
return geometryType;
}
void GeometryWriter::writePoint(const OGRPoint *p)
{
m_xy.push_back(p->getX());
m_xy.push_back(p->getY());
if (m_hasZ)
m_z.push_back(p->getZ());
if (m_hasM)
m_m.push_back(p->getM());
}
void GeometryWriter::writeMultiPoint(const OGRMultiPoint *mp)
{
for (const auto part : *mp)
if (!part->IsEmpty())
writePoint(part);
}
uint32_t GeometryWriter::writeSimpleCurve(const OGRSimpleCurve *sc)
{
uint32_t numPoints = sc->getNumPoints();
const auto xyLength = m_xy.size();
m_xy.resize(xyLength + (numPoints * 2));
const auto zLength = m_z.size();
double *padfZOut = nullptr;
if (m_hasZ)
{
m_z.resize(zLength + numPoints);
padfZOut = m_z.data() + zLength;
}
const auto mLength = m_m.size();
double *padfMOut = nullptr;
if (m_hasM)
{
m_m.resize(mLength + numPoints);
padfMOut = m_m.data() + mLength;
}
sc->getPoints(reinterpret_cast<double *>(
reinterpret_cast<OGRRawPoint *>(m_xy.data() + xyLength)),
sizeof(OGRRawPoint),
reinterpret_cast<double *>(
reinterpret_cast<OGRRawPoint *>(m_xy.data() + xyLength)) +
1,
sizeof(OGRRawPoint), padfZOut, sizeof(double), padfMOut,
sizeof(double));
return numPoints;
}
void GeometryWriter::writeMultiLineString(const OGRMultiLineString *mls)
{
uint32_t e = 0;
for (const auto part : *mls)
if (!part->IsEmpty())
m_ends.push_back(e += writeSimpleCurve(part));
}
void GeometryWriter::writePolygon(const OGRPolygon *p)
{
const auto exteriorRing = p->getExteriorRing();
const auto numInteriorRings = p->getNumInteriorRings();
uint32_t e = writeSimpleCurve(exteriorRing);
// NOTE: should not write ends if only exterior ring
if (numInteriorRings > 0)
{
m_ends.push_back(e);
for (int i = 0; i < numInteriorRings; i++)
m_ends.push_back(e += writeSimpleCurve(p->getInteriorRing(i)));
}
}
const Offset<Geometry>
GeometryWriter::writeMultiPolygon(const OGRMultiPolygon *mp, int depth)
{
std::vector<Offset<Geometry>> parts;
for (const auto part : *mp)
if (!part->IsEmpty())
parts.push_back(writePart(part, GeometryType::Polygon, depth + 1));
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, m_geometryType, &parts);
}
const Offset<Geometry>
GeometryWriter::writeGeometryCollection(const OGRGeometryCollection *gc,
int depth)
{
std::vector<Offset<Geometry>> parts;
for (const auto part : *gc)
if (!part->IsEmpty())
parts.push_back(writePart(part, depth + 1));
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, m_geometryType, &parts);
}
const Offset<Geometry>
GeometryWriter::writeCompoundCurve(const OGRCompoundCurve *cc, int depth)
{
std::vector<Offset<Geometry>> parts;
for (const auto curve : *cc)
parts.push_back(writePart(curve, depth + 1));
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, m_geometryType, &parts);
}
const Offset<Geometry>
GeometryWriter::writeCurvePolygon(const OGRCurvePolygon *cp, int depth)
{
std::vector<Offset<Geometry>> parts;
for (const auto curve : *cp)
parts.push_back(writePart(curve, depth + 1));
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, m_geometryType, &parts);
}
const Offset<Geometry>
GeometryWriter::writePolyhedralSurface(const OGRPolyhedralSurface *p, int depth)
{
std::vector<Offset<Geometry>> parts;
for (const auto part : *p)
parts.push_back(writePart(part, depth + 1));
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, m_geometryType, &parts);
}
void GeometryWriter::writeTIN(const OGRTriangulatedSurface *ts)
{
const auto numGeometries = ts->getNumGeometries();
if (numGeometries == 1)
return (void)writeSimpleCurve(ts->getGeometryRef(0)->getExteriorRing());
uint32_t e = 0;
for (const auto part : *ts)
m_ends.push_back(e += writeSimpleCurve(part->getExteriorRing()));
}
const Offset<Geometry> GeometryWriter::write(int depth)
{
bool unknownGeometryType = false;
if (depth == 0 && m_geometryType == GeometryType::Unknown)
{
m_geometryType =
translateOGRwkbGeometryType(m_ogrGeometry->getGeometryType());
unknownGeometryType = true;
}
switch (m_geometryType)
{
case GeometryType::Point:
writePoint(m_ogrGeometry->toPoint());
break;
case GeometryType::MultiPoint:
writeMultiPoint(m_ogrGeometry->toMultiPoint());
break;
case GeometryType::LineString:
writeSimpleCurve(m_ogrGeometry->toLineString());
break;
case GeometryType::MultiLineString:
writeMultiLineString(m_ogrGeometry->toMultiLineString());
break;
case GeometryType::Polygon:
writePolygon(m_ogrGeometry->toPolygon());
break;
case GeometryType::MultiPolygon:
return writeMultiPolygon(m_ogrGeometry->toMultiPolygon(), depth);
case GeometryType::GeometryCollection:
return writeGeometryCollection(
m_ogrGeometry->toGeometryCollection(), depth);
case GeometryType::CircularString:
writeSimpleCurve(m_ogrGeometry->toCircularString());
break;
case GeometryType::CompoundCurve:
return writeCompoundCurve(m_ogrGeometry->toCompoundCurve(), depth);
case GeometryType::CurvePolygon:
return writeCurvePolygon(m_ogrGeometry->toCurvePolygon(), depth);
case GeometryType::MultiCurve:
return writeGeometryCollection(m_ogrGeometry->toMultiCurve(),
depth);
case GeometryType::MultiSurface:
return writeGeometryCollection(m_ogrGeometry->toMultiSurface(),
depth);
case GeometryType::PolyhedralSurface:
return writePolyhedralSurface(m_ogrGeometry->toPolyhedralSurface(),
depth);
case GeometryType::Triangle:
writePolygon(m_ogrGeometry->toTriangle());
break;
case GeometryType::TIN:
writeTIN(m_ogrGeometry->toTriangulatedSurface());
break;
default:
CPLError(CE_Failure, CPLE_AppDefined,
"GeometryWriter::write: Unknown type %d",
(int)m_geometryType);
return 0;
}
const auto pEnds = m_ends.empty() ? nullptr : &m_ends;
const auto pXy = m_xy.empty() ? nullptr : &m_xy;
const auto pZ = m_z.empty() ? nullptr : &m_z;
const auto pM = m_m.empty() ? nullptr : &m_m;
const auto geometryType = depth > 0 || unknownGeometryType
? m_geometryType
: GeometryType::Unknown;
return FlatGeobuf::CreateGeometryDirect(m_fbb, pEnds, pXy, pZ, pM, nullptr,
nullptr, geometryType);
}
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