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# SnapOverlayOp.h

    00001 /**********************************************************************
    00002  * $Id: SnapOverlayOp.h 3538 2011-12-09 10:44:54Z strk $
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2009  Sandro Santilli <strk@keybit.net>
    00008  *
    00009  * This is free software; you can redistribute and/or modify it under
    00010  * the terms of the GNU Lesser General Public Licence as published
    00011  * by the Free Software Foundation.
    00012  * See the COPYING file for more information.
    00013  *
    00014  ***********************************************************************
    00015  *
    00016  * Last port: operation/overlay/snap/SnapOverlayOp.java r320 (JTS-1.12)
    00017  *
    00018  **********************************************************************/
    00019
    00020 #ifndef GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
    00021 #define GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
    00022
    00023 #include <geos/operation/overlay/OverlayOp.h> // for enums
    00024 #include <geos/precision/CommonBitsRemover.h> // for dtor visibility by auto_ptr
    00025
    00026 #include <memory> // for auto_ptr
    00027
    00028 #ifdef _MSC_VER
    00029 #pragma warning(push)
    00030 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
    00031 #endif
    00032
    00033 // Forward declarations
    00034 namespace geos {
    00035         namespace geom {
    00036                 class Geometry;
    00037                 struct GeomPtrPair;
    00038         }
    00039 }
    00040
    00041 namespace geos {
    00042 namespace operation { // geos::operation
    00043 namespace overlay { // geos::operation::overlay
    00044 namespace snap { // geos::operation::overlay::snap
    00045
    00057 class GEOS_DLL SnapOverlayOp
    00058 {
    00059
    00060 public:
    00061
    00062         static std::auto_ptr<geom::Geometry>
    00063         overlayOp(const geom::Geometry& g0, const geom::Geometry& g1,
    00064                   OverlayOp::OpCode opCode)
    00065         {
    00066                 SnapOverlayOp op(g0, g1);
    00067                 return op.getResultGeometry(opCode);
    00068         }
    00069
    00070         static std::auto_ptr<geom::Geometry>
    00071         intersection(const geom::Geometry& g0, const geom::Geometry& g1)
    00072         {
    00073                 return overlayOp(g0, g1, OverlayOp::opINTERSECTION);
    00074         }
    00075
    00076         static std::auto_ptr<geom::Geometry>
    00077         Union(const geom::Geometry& g0, const geom::Geometry& g1)
    00078         {
    00079                 return overlayOp(g0, g1, OverlayOp::opUNION);
    00080         }
    00081
    00082         static std::auto_ptr<geom::Geometry>
    00083         difference(const geom::Geometry& g0, const geom::Geometry& g1)
    00084         {
    00085                 return overlayOp(g0, g1, OverlayOp::opDIFFERENCE);
    00086         }
    00087
    00088         static std::auto_ptr<geom::Geometry>
    00089         symDifference(const geom::Geometry& g0, const geom::Geometry& g1)
    00090         {
    00091                 return overlayOp(g0, g1, OverlayOp::opSYMDIFFERENCE);
    00092         }
    00093
    00094         SnapOverlayOp(const geom::Geometry& g1, const geom::Geometry& g2)
    00095                 :
    00096                 geom0(g1),
    00097                 geom1(g2)
    00098         {
    00099                 computeSnapTolerance();
    00100         }
    00101
    00102
    00103         typedef std::auto_ptr<geom::Geometry> GeomPtr;
    00104
    00105         GeomPtr getResultGeometry(OverlayOp::OpCode opCode);
    00106
    00107 private:
    00108
    00109         void computeSnapTolerance();
    00110
    00111         void snap(geom::GeomPtrPair& ret);
    00112
    00113         void removeCommonBits(const geom::Geometry& geom0,
    00114                               const geom::Geometry& geom1,
    00115                               geom::GeomPtrPair& ret);
    00116
    00117         // re-adds common bits to the given geom
    00118         void prepareResult(geom::Geometry& geom);
    00119
    00120
    00121         const geom::Geometry& geom0;
    00122         const geom::Geometry& geom1;
    00123
    00124         double snapTolerance;
    00125
    00126         std::auto_ptr<precision::CommonBitsRemover> cbr;
    00127
    00128     // Declare type as noncopyable
    00129     SnapOverlayOp(const SnapOverlayOp& other);
    00130     SnapOverlayOp& operator=(const SnapOverlayOp& rhs);
    00131 };
    00132
    00133 } // namespace geos::operation::overlay::snap
    00134 } // namespace geos::operation::overlay
    00135 } // namespace geos::operation
    00136 } // namespace geos
    00137
    00138 #ifdef _MSC_VER
    00139 #pragma warning(pop)
    00140 #endif
    00141
    00142 #endif // ndef GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
    00143
    00144 /**********************************************************************
    00145  * $Log$
    00146  **********************************************************************/
    00147