SnapOverlayOp.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009  Sandro Santilli <strk@keybit.net>
 *
 * 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: operation/overlay/snap/SnapOverlayOp.java r320 (JTS-1.12)
 *
 **********************************************************************/
 
#ifndef GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
#define GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
 
#include <geos/operation/overlay/OverlayOp.h> // for enums 
#include <geos/precision/CommonBitsRemover.h> // for dtor visibility by auto_ptr
 
#include <memory> // for auto_ptr
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
// Forward declarations
namespace geos {
        namespace geom {
                class Geometry;
                struct GeomPtrPair;
        }
}
 
namespace geos {
namespace operation { // geos::operation
namespace overlay { // geos::operation::overlay
namespace snap { // geos::operation::overlay::snap

class GEOS_DLL SnapOverlayOp
{
 
public:
 
        static std::auto_ptr<geom::Geometry>
        overlayOp(const geom::Geometry& g0, const geom::Geometry& g1,
                  OverlayOp::OpCode opCode)
        {
                SnapOverlayOp op(g0, g1);
                return op.getResultGeometry(opCode);
        }
 
        static std::auto_ptr<geom::Geometry>
        intersection(const geom::Geometry& g0, const geom::Geometry& g1)
        {
                return overlayOp(g0, g1, OverlayOp::opINTERSECTION);
        }
 
        static std::auto_ptr<geom::Geometry>
        Union(const geom::Geometry& g0, const geom::Geometry& g1)
        {
                return overlayOp(g0, g1, OverlayOp::opUNION);
        }
 
        static std::auto_ptr<geom::Geometry>
        difference(const geom::Geometry& g0, const geom::Geometry& g1)
        {
                return overlayOp(g0, g1, OverlayOp::opDIFFERENCE);
        }
 
        static std::auto_ptr<geom::Geometry>
        symDifference(const geom::Geometry& g0, const geom::Geometry& g1)
        {
                return overlayOp(g0, g1, OverlayOp::opSYMDIFFERENCE);
        }
 
        SnapOverlayOp(const geom::Geometry& g1, const geom::Geometry& g2)
                :
                geom0(g1),
                geom1(g2)
        {
                computeSnapTolerance();
        }
 
        
        typedef std::auto_ptr<geom::Geometry> GeomPtr;
 
        GeomPtr getResultGeometry(OverlayOp::OpCode opCode);
 
private:
 
        void computeSnapTolerance();
 
        void snap(geom::GeomPtrPair& ret);
 
        void removeCommonBits(const geom::Geometry& geom0,
                              const geom::Geometry& geom1,
                              geom::GeomPtrPair& ret);
 
        // re-adds common bits to the given geom
        void prepareResult(geom::Geometry& geom);
 
 
        const geom::Geometry& geom0;
        const geom::Geometry& geom1;
 
        double snapTolerance;
 
        std::auto_ptr<precision::CommonBitsRemover> cbr;
 
    // Declare type as noncopyable
    SnapOverlayOp(const SnapOverlayOp& other);
    SnapOverlayOp& operator=(const SnapOverlayOp& rhs);
};
 
} // namespace geos::operation::overlay::snap
} // namespace geos::operation::overlay
} // namespace geos::operation
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // ndef GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H