GeometryFixer.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2021 Paul Ramsey <pramsey@cleverelephant.ca>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <memory>
#include <vector>
 
#include <geos/geom/Geometry.h>
#include <geos/export.h>
 
// Forward declarations
namespace geos {
namespace geom {
class GeometryFactory;
class Point;
class Polygon;
class LineString;
class LinearRing;
class MultiPoint;
class MultiPolygon;
class MultiLineString;
class GeometryCollection;
}
}
 
namespace geos {
namespace geom { // geos.geom
namespace util { // geos.geom.util
 
class GEOS_DLL GeometryFixer {
 
private:
 
    const geom::Geometry* geom;
    const geom::GeometryFactory* factory;
    bool isKeepCollapsed; // false
 
public:
 
    GeometryFixer(const geom::Geometry* p_geom)
        : geom(p_geom)
        , factory(p_geom->getFactory())
        , isKeepCollapsed(false)
        {};
 
    static std::unique_ptr<geom::Geometry> fix(const geom::Geometry* geom);
 
    void setKeepCollapsed(bool p_isKeepCollapsed);
 
    std::unique_ptr<geom::Geometry> getResult() const;
 
private:
 
    std::unique_ptr<geom::Point> fixPoint(const geom::Point* geom) const;
    std::unique_ptr<geom::Point> fixPointElement(const geom::Point* geom) const;
    bool isValidPoint(const geom::Point* pt) const;
    std::unique_ptr<geom::Geometry> fixMultiPoint(const geom::MultiPoint* geom) const;
    std::unique_ptr<geom::Geometry> fixLinearRing(const geom::LinearRing* geom) const;
    std::unique_ptr<geom::Geometry> fixLinearRingElement(const geom::LinearRing* geom) const;
    std::unique_ptr<geom::Geometry> fixLineString(const geom::LineString* geom) const;
    std::unique_ptr<geom::Geometry> fixLineStringElement(const geom::LineString* geom) const;
 
    std::unique_ptr<geom::Geometry> fixMultiLineString(const MultiLineString* geom) const;
    std::unique_ptr<geom::Geometry> fixPolygon(const geom::Polygon* geom) const;
    std::unique_ptr<geom::Geometry> fixPolygonElement(const geom::Polygon* geom) const;
    std::vector<std::unique_ptr<Geometry>> fixHoles(const geom::Polygon* geom) const;
    std::unique_ptr<geom::Geometry> removeHoles(const geom::Geometry* shell, const geom::Geometry* holes) const;
    std::unique_ptr<geom::Geometry> fixRing(const geom::LinearRing* ring) const;
    std::unique_ptr<geom::Geometry> fixMultiPolygon(const geom::MultiPolygon* geom) const;
    std::unique_ptr<geom::Geometry> fixCollection(const geom::GeometryCollection* geom) const;
 
    void classifyHoles(
        const Geometry* shell,
        std::vector<std::unique_ptr<Geometry>>& holesFixed,
        std::vector<const Geometry*>& holes,
        std::vector<const Geometry*>& shells) const;
 
    std::unique_ptr<Geometry> difference(
        const Geometry* shell,
        std::vector<const Geometry*>& holes) const;
 
    std::unique_ptr<Geometry> unionGeometry(
        std::vector<const Geometry*>& polys) const;
 
};
 
} // namespace geos.geom.util
} // namespace geos.geom
} // namespace geos