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polygonize_polygonizer.h
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polygonize_polygonizer.h
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/******************************************************************************
* Project: GDAL
* Purpose: Implements The Two-Arm Chains EdgeTracing Algorithm
* Author: kikitte.lee
*
******************************************************************************
* Copyright (c) 2023, kikitte.lee <kikitte.lee@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* 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 AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef POLYGONIZE_POLYGONIZER_H_INCLUDED
#define POLYGONIZE_POLYGONIZER_H_INCLUDED
/*! @cond Doxygen_Suppress */
// Implements Junhua Teng, Fahui Wang, Yu Liu: An Efficient Algorithm for
// Raster-to-Vector Data Conversion: https://doi.org/10.1080/10824000809480639
#include <array>
#include <cstdint>
#include <vector>
#include <limits>
#include <map>
#include "cpl_error.h"
#include "ogr_api.h"
namespace gdal
{
namespace polygonizer
{
using IndexType = std::uint32_t;
using Point = std::array<IndexType, 2>;
using Arc = std::vector<Point>;
struct IndexedArc
{
Arc *poArc;
std::size_t iIndex;
};
/**
* A raster polygon(RPolygon) is formed by a list of arcs in order.
* Each arc has two properties:
* 1. does the arc follows the right-hand rule respect to the area it bounds
* 2. the next arc of the current arc
*/
struct RPolygon
{
IndexType iBottomRightRow{0};
IndexType iBottomRightCol{0};
// arc object list
std::vector<Arc *> oArcs{};
// does arc follows the right-hand rule with
std::vector<bool> oArcRighthandFollow{};
// each element is the next arc index of the current arc
std::vector<std::size_t> oArcConnections{};
RPolygon() = default;
RPolygon(const RPolygon &) = delete;
RPolygon &operator=(const RPolygon &) = delete;
~RPolygon();
/**
* create a new arc object
*/
IndexedArc newArc(bool bFollowRighthand);
/**
* set the next arc index of the current arc
*/
void setArcConnection(IndexedArc &oArc, IndexedArc &oNextArc);
/**
* update the bottom-right most cell index of the current polygon
*/
void updateBottomRightPos(IndexType iRow, IndexType iCol);
};
/**
* Arm class is used to record the tracings of both arcs and polygons.
*/
struct TwoArm
{
IndexType iRow{0};
IndexType iCol{0};
RPolygon *poPolyInside{nullptr};
RPolygon *poPolyAbove{nullptr};
RPolygon *poPolyLeft{nullptr};
IndexedArc oArcHorOuter{};
IndexedArc oArcHorInner{};
IndexedArc oArcVerInner{};
IndexedArc oArcVerOuter{};
bool bSolidHorizontal{false};
bool bSolidVertical{false};
};
template <typename DataType> class PolygonReceiver
{
public:
PolygonReceiver() = default;
PolygonReceiver(const PolygonReceiver<DataType> &) = delete;
virtual ~PolygonReceiver() = default;
PolygonReceiver<DataType> &
operator=(const PolygonReceiver<DataType> &) = delete;
virtual void receive(RPolygon *poPolygon, DataType nPolygonCellValue) = 0;
};
/**
* Polygonizer is used to manage polygon memory and do the edge tracing process
*/
template <typename PolyIdType, typename DataType> class Polygonizer
{
public:
static constexpr PolyIdType THE_OUTER_POLYGON_ID =
std::numeric_limits<PolyIdType>::max();
private:
using PolygonMap = std::map<PolyIdType, RPolygon *>;
using PolygonMapEntry = typename PolygonMap::value_type;
PolyIdType nInvalidPolyId_;
RPolygon *poTheOuterPolygon_{nullptr};
PolygonMap oPolygonMap_{};
PolygonReceiver<DataType> *poPolygonReceiver_;
RPolygon *getPolygon(PolyIdType nPolygonId);
RPolygon *createPolygon(PolyIdType nPolygonId);
void destroyPolygon(PolyIdType nPolygonId);
public:
explicit Polygonizer(PolyIdType nInvalidPolyId,
PolygonReceiver<DataType> *poPolygonReceiver);
Polygonizer(const Polygonizer<PolyIdType, DataType> &) = delete;
~Polygonizer();
Polygonizer<PolyIdType, DataType> &
operator=(const Polygonizer<PolyIdType, DataType> &) = delete;
RPolygon *getTheOuterPolygon() const
{
return poTheOuterPolygon_;
}
void processLine(const PolyIdType *panThisLineId,
const DataType *panLastLineVal, TwoArm *poThisLineArm,
TwoArm *poLastLineArm, IndexType nCurrentRow,
IndexType nCols);
};
/**
* Write raster polygon object to OGR layer.
*/
template <typename DataType>
class OGRPolygonWriter : public PolygonReceiver<DataType>
{
OGRLayerH hOutLayer_;
int iPixValField_;
double *padfGeoTransform_;
CPLErr eErr_{CE_None};
public:
OGRPolygonWriter(OGRLayerH hOutLayer, int iPixValField,
double *padfGeoTransform);
OGRPolygonWriter(const OGRPolygonWriter<DataType> &) = delete;
~OGRPolygonWriter() = default;
OGRPolygonWriter<DataType> &
operator=(const OGRPolygonWriter<DataType> &) = delete;
void receive(RPolygon *poPolygon, DataType nPolygonCellValue) override;
inline CPLErr getErr()
{
return eErr_;
}
};
} // namespace polygonizer
} // namespace gdal
/*! @endcond */
#endif /* POLYGONIZE_POLYGONIZER_H_INCLUDED */