SharedPathsOp.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2010      Sandro Santilli <strk@kbt.io>
 *
 * 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.
 *
 **********************************************************************
 *
 * Last port: original work
 *
 * Developed by Sandro Santilli (strk@kbt.io)
 * for Faunalia (http://www.faunalia.it)
 * with funding from Regione Toscana - Settore SISTEMA INFORMATIVO
 * TERRITORIALE ED AMBIENTALE - for the project: "Sviluppo strumenti
 * software per il trattamento di dati geografici basati su QuantumGIS
 * e Postgis (CIG 0494241492)"
 *
 **********************************************************************/

#ifndef GEOS_OPERATION_SHAREDPATHSOP_H
#define GEOS_OPERATION_SHAREDPATHSOP_H

#include <geos/export.h> // for GEOS_DLL

#include <vector>

// Forward declarations
namespace geos {
namespace geom {
class LineString;
class Geometry;
class GeometryFactory;
}
}


namespace geos {
namespace operation { // geos.operation

namespace sharedpaths { // geos.operation.sharedpaths

class GEOS_DLL SharedPathsOp {
public:

    typedef std::vector<geom::LineString*> PathList;

    static void sharedPathsOp(const geom::Geometry& g1,
                              const geom::Geometry& g2,
                              PathList& sameDirection,
                              PathList& oppositeDirection);

    SharedPathsOp(const geom::Geometry& g1, const geom::Geometry& g2);

    void getSharedPaths(PathList& sameDirection, PathList& oppositeDirection);

    static void clearEdges(PathList& from);

private:

    void findLinearIntersections(PathList& to);

    bool isForward(const geom::LineString& edge,
                   const geom::Geometry& geom);

    bool
    isSameDirection(const geom::LineString& edge)
    {
        return (isForward(edge, _g1) == isForward(edge, _g2));
    }

    void checkLinealInput(const geom::Geometry& g);

    const geom::Geometry& _g1;
    const geom::Geometry& _g2;
    const geom::GeometryFactory& _gf;

    // Declare type as noncopyable
    SharedPathsOp(const SharedPathsOp& other) = delete;
    SharedPathsOp& operator=(const SharedPathsOp& rhs) = delete;

};

} // namespace geos.operation.sharedpaths
} // namespace geos.operation
} // namespace geos

#endif