GEOS
3.3.5
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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