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# SnapOverlayOp.h

    00001 /**********************************************************************
    00002  * $Id: SnapOverlayOp.h 2809 2009-12-06 01:05:24Z mloskot $
    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 rev 1.4 (JTS-1.10)
    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 // Forward declarations
    00029 namespace geos {
    00030         namespace geom {
    00031                 class Geometry;
    00032         }
    00033 }
    00034
    00035 namespace geos {
    00036 namespace operation { // geos::operation
    00037 namespace overlay { // geos::operation::overlay
    00038 namespace snap { // geos::operation::overlay::snap
    00039
    00051 class GEOS_DLL SnapOverlayOp
    00052 {
    00053
    00054 public:
    00055
    00056         static std::auto_ptr<geom::Geometry>
    00057         overlayOp(const geom::Geometry& g0, const geom::Geometry& g1,
    00058                   OverlayOp::OpCode opCode)
    00059         {
    00060                 SnapOverlayOp op(g0, g1);
    00061                 return op.getResultGeometry(opCode);
    00062         }
    00063
    00064         static std::auto_ptr<geom::Geometry>
    00065         intersection(const geom::Geometry& g0, const geom::Geometry& g1)
    00066         {
    00067                 return overlayOp(g0, g1, OverlayOp::opINTERSECTION);
    00068         }
    00069
    00070         static std::auto_ptr<geom::Geometry>
    00071         Union(const geom::Geometry& g0, const geom::Geometry& g1)
    00072         {
    00073                 return overlayOp(g0, g1, OverlayOp::opUNION);
    00074         }
    00075
    00076         static std::auto_ptr<geom::Geometry>
    00077         difference(const geom::Geometry& g0, const geom::Geometry& g1)
    00078         {
    00079                 return overlayOp(g0, g1, OverlayOp::opDIFFERENCE);
    00080         }
    00081
    00082         static std::auto_ptr<geom::Geometry>
    00083         symDifference(const geom::Geometry& g0, const geom::Geometry& g1)
    00084         {
    00085                 return overlayOp(g0, g1, OverlayOp::opSYMDIFFERENCE);
    00086         }
    00087
    00088         SnapOverlayOp(const geom::Geometry& g1, const geom::Geometry& g2)
    00089                 :
    00090                 geom0(g1),
    00091                 geom1(g2)
    00092         {
    00093                 computeSnapTolerance();
    00094         }
    00095
    00096
    00097         typedef std::auto_ptr<geom::Geometry> GeomPtr;
    00098
    00099         GeomPtr getResultGeometry(OverlayOp::OpCode opCode);
    00100
    00101 private:
    00102
    00103         void computeSnapTolerance();
    00104
    00105         typedef std::pair<GeomPtr, GeomPtr> GeomPtrPair;
    00106
    00107         void snap(GeomPtrPair& ret);
    00108
    00109         void removeCommonBits(const geom::Geometry& geom0,
    00110                               const geom::Geometry& geom1, GeomPtrPair& ret);
    00111
    00112         // re-adds common bits to the given geom
    00113         void prepareResult(geom::Geometry& geom);
    00114
    00115
    00116         const geom::Geometry& geom0;
    00117         const geom::Geometry& geom1;
    00118
    00119         double snapTolerance;
    00120
    00121         std::auto_ptr<precision::CommonBitsRemover> cbr;
    00122
    00123     // Declare type as noncopyable
    00124     SnapOverlayOp(const SnapOverlayOp& other);
    00125     SnapOverlayOp& operator=(const SnapOverlayOp& rhs);
    00126 };
    00127
    00128
    00129 } // namespace geos::operation::overlay::snap
    00130 } // namespace geos::operation::overlay
    00131 } // namespace geos::operation
    00132 } // namespace geos
    00133
    00134 #endif // ndef GEOS_OP_OVERLAY_SNAP_SNAPOVERLAYOP_H
    00135
    00136 /**********************************************************************
    00137  * $Log$
    00138  **********************************************************************/
    00139