LineStringSnapper.h

00001 /**********************************************************************
00002  * $Id: LineStringSnapper.h 3225 2011-02-21 14:02:37Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2009-2010  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/LineStringSnapper.java r320 (JTS-1.12)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
00022 #define GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
00023 
00024 #include <geos/geom/Coordinate.h>
00025 #include <geos/geom/CoordinateSequence.h>
00026 #include <geos/geom/CoordinateList.h>
00027 
00028 #include <memory>
00029 
00030 // Forward declarations
00031 namespace geos {
00032         namespace geom { 
00033                 //class PrecisionModel;
00034                 //class CoordinateSequence;
00035                 class CoordinateList;
00036                 class Geometry;
00037         }
00038 }
00039 
00040 namespace geos {
00041 namespace operation { // geos::operation
00042 namespace overlay { // geos::operation::overlay
00043 namespace snap { // geos::operation::overlay::snap
00044 
00052 class GEOS_DLL LineStringSnapper {
00053 
00054 public:
00055 
00063         LineStringSnapper(const geom::Coordinate::Vect& nSrcPts,
00064                                                   double nSnapTol)
00065                 :
00066                 srcPts(nSrcPts),
00067                 snapTolerance(nSnapTol),
00068                 allowSnappingToSourceVertices(false)
00069         {
00070                 size_t s = srcPts.size();
00071                 isClosed = s < 2 ? false : srcPts[0].equals2D(srcPts[s-1]);
00072         }
00073 
00074         // Snap points are assumed to be all distinct points (a set would be better, uh ?)
00075         std::auto_ptr<geom::Coordinate::Vect> snapTo(const geom::Coordinate::ConstVect& snapPts);
00076 
00077         void setAllowSnappingToSourceVertices(bool allow) {
00078                 allowSnappingToSourceVertices = allow;
00079         }
00080 
00081 private:
00082 
00083         const geom::Coordinate::Vect& srcPts;
00084 
00085         double snapTolerance;
00086 
00087         bool allowSnappingToSourceVertices;
00088         bool isClosed;
00089 
00090 
00091         // Modifies first arg
00092         void snapVertices(geom::CoordinateList& srcCoords,
00093                         const geom::Coordinate::ConstVect& snapPts);
00094 
00095 
00096         // Returns snapPts.end() if no snap point is close enough (within snapTol distance)
00097         geom::Coordinate::ConstVect::const_iterator findSnapForVertex(const geom::Coordinate& pt,
00098                         const geom::Coordinate::ConstVect& snapPts);
00099 
00115   void snapSegments(geom::CoordinateList& srcCoords,
00116                     const geom::Coordinate::ConstVect& snapPts);
00117 
00121         //
00145         geom::CoordinateList::iterator findSegmentToSnap(
00146                         const geom::Coordinate& snapPt,
00147                         geom::CoordinateList::iterator from,
00148                         geom::CoordinateList::iterator too_far);
00149 
00150     // Declare type as noncopyable
00151     LineStringSnapper(const LineStringSnapper& other);
00152     LineStringSnapper& operator=(const LineStringSnapper& rhs);
00153 };
00154 
00155 
00156 } // namespace geos::operation::overlay::snap
00157 } // namespace geos::operation::overlay
00158 } // namespace geos::operation
00159 } // namespace geos
00160 
00161 #endif // GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
00162 

Generated on Sat Aug 20 01:31:06 2011 for GEOS by  doxygen 1.4.7