GeometrySnapper.h

00001 /**********************************************************************
00002  * $Id: GeometrySnapper.h 1948 2006-12-18 18:44:20Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2006 Refractions Research Inc.
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/GeometrySnapper.java rev. 1.6
00017  * (we should move in GEOS too, probably)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_PRECISION_GEOMETRYSNAPPER_H
00022 #define GEOS_PRECISION_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 precision { // geos.precision
00040 
00045 class GeometrySnapper {
00046 
00047 public:
00048 
00049         GeometrySnapper(const geom::Geometry& g)
00050                 :
00051                 srcGeom(g)
00052         {
00053         }
00054 
00064         std::auto_ptr<geom::Geometry> snapTo(const geom::Geometry& g, double snapTolerance);
00065 
00073         static double computeOverlaySnapTolerance(const geom::Geometry& g);
00074 
00075         static double computeSizeBasedSnapTolerance(const geom::Geometry& g);
00076 
00080         static double computeOverlaySnapTolerance(const geom::Geometry& g1,
00081                         const geom::Geometry& g2);
00082 
00083 
00084 private:
00085 
00086         // eventually this will be determined from the geometry topology
00087         //static const double snapTol; //  = 0.000001;
00088 
00089         static const double snapPrecisionFactor; //  = 10e-10
00090 
00091         const geom::Geometry& srcGeom;
00092 
00094         std::auto_ptr<geom::Coordinate::ConstVect> extractTargetCoordinates(
00095                         const geom::Geometry& g);
00096 };
00097 
00098 
00099 } // namespace geos.precision
00100 } // namespace geos
00101 
00102 #endif // GEOS_PRECISION_GEOMETRYSNAPPER_H
00103 
00104 /**********************************************************************
00105  * $Log$
00106  * Revision 1.1  2006/07/21 17:09:14  strk
00107  * Added new precision::LineStringSnapper class + test
00108  * and precision::GeometrySnapper (w/out test)
00109  *
00110  **********************************************************************/

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