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GeometrySnapper.h

00001 /**********************************************************************
00002  * $Id: GeometrySnapper.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  * Copyright (C) 2006 Refractions Research Inc.
00009  *
00010  * This is free software; you can redistribute and/or modify it under
00011  * the terms of the GNU Lesser General Public Licence as published
00012  * by the Free Software Foundation. 
00013  * See the COPYING file for more information.
00014  *
00015  ***********************************************************************
00016  *
00017  * Last port: operation/overlay/snap/GeometrySnapper.java rev 1.8 (JTS-1.10)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_OP_OVERLAY_SNAP_GEOMETRYSNAPPER_H
00022 #define GEOS_OP_OVERLAY_SNAP_GEOMETRYSNAPPER_H
00023 
00024 #include <geos/geom/Coordinate.h>
00025 
00026 #include <memory>
00027 #include <vector>
00028 
00029 // Forward declarations
00030 namespace geos {
00031         namespace geom { 
00032                 //class PrecisionModel;
00033                 class Geometry;
00034                 class CoordinateSequence;
00035         }
00036 }
00037 
00038 namespace geos {
00039 namespace operation { // geos::operation
00040 namespace overlay { // geos::operation::overlay
00041 namespace snap { // geos::operation::overlay::snap
00042 
00047 class GEOS_DLL GeometrySnapper {
00048 
00049 public:
00050 
00051         typedef std::auto_ptr<geom::Geometry> GeomPtr;
00052         typedef std::pair<GeomPtr, GeomPtr> GeomPtrPair;
00053 
00063         static void snap(const geom::Geometry& g0,
00064                                 const geom::Geometry& g1,
00065                                 double snapTolerance, GeomPtrPair& ret);
00066 
00072         GeometrySnapper(const geom::Geometry& g)
00073                 :
00074                 srcGeom(g)
00075         {
00076         }
00077 
00087         std::auto_ptr<geom::Geometry> snapTo(const geom::Geometry& g,
00088                                              double snapTolerance);
00089 
00097         static double computeOverlaySnapTolerance(const geom::Geometry& g);
00098 
00099         static double computeSizeBasedSnapTolerance(const geom::Geometry& g);
00100 
00104         static double computeOverlaySnapTolerance(const geom::Geometry& g1,
00105                         const geom::Geometry& g2);
00106 
00107 
00108 private:
00109 
00110         // eventually this will be determined from the geometry topology
00111         //static const double snapTol; //  = 0.000001;
00112 
00113         static const double snapPrecisionFactor; //  = 10e-10
00114 
00115         const geom::Geometry& srcGeom;
00116 
00118         std::auto_ptr<geom::Coordinate::ConstVect> extractTargetCoordinates(
00119                         const geom::Geometry& g);
00120 
00121     // Declare type as noncopyable
00122     GeometrySnapper(const GeometrySnapper& other);
00123     GeometrySnapper& operator=(const GeometrySnapper& rhs);
00124 };
00125 
00126 
00127 } // namespace geos::operation::overlay::snap
00128 } // namespace geos::operation::overlay
00129 } // namespace geos::operation
00130 } // namespace geos
00131 
00132 #endif // GEOS_OP_OVERLAY_SNAP_GEOMETRYSNAPPER_H
00133 

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