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OffsetCurveVertexList.h

00001 /**********************************************************************
00002  * $Id: OffsetCurveVertexList.h 2628 2009-09-27 20:43:03Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2007 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/buffer/OffsetCurveVertexList.java rev. 1.2 (JTS-1.10)
00017  *
00018  **********************************************************************/
00019 
00020 #ifndef GEOS_OP_BUFFER_OFFSETCURVEVERTEXLIST_H
00021 #define GEOS_OP_BUFFER_OFFSETCURVEVERTEXLIST_H
00022 
00023 #include <geos/geom/Coordinate.h> // for inlines
00024 #include <geos/geom/CoordinateSequence.h> // for inlines
00025 #include <geos/geom/CoordinateArraySequence.h> // for composition
00026 #include <geos/geom/PrecisionModel.h> // for inlines
00027 
00028 #include <vector>
00029 #include <memory>
00030 
00031 // Forward declarations
00032 namespace geos {
00033         namespace geom {
00034                 //class CoordinateSequence;
00035                 //class PrecisionModel;
00036         }
00037 }
00038 
00039 namespace geos {
00040 namespace operation { // geos.operation
00041 namespace buffer { // geos.operation.buffer
00042 
00043 // ---------------------------------------------
00044 // OffsetCurveVertexList
00045 // ---------------------------------------------
00046 
00048 //
00051 class OffsetCurveVertexList 
00052 {
00053 
00054 private:
00055 
00056         geom::CoordinateSequence* ptList;
00057 
00058         const geom::PrecisionModel* precisionModel;
00059   
00066         double minimumVertexDistance;
00067 
00075         bool isDuplicate(const geom::Coordinate& pt)
00076         {
00077                 if (ptList->size() < 1)
00078                         return false;
00079                 const geom::Coordinate& lastPt = ptList->back();
00080                 double ptDist = pt.distance(lastPt);
00081                 if (ptDist < minimumVertexDistance)
00082                         return true;
00083                 return false;
00084         }
00085         
00086 
00087 public:
00088         
00089         friend std::ostream& operator<< (std::ostream& os, const OffsetCurveVertexList& node);
00090 
00091         OffsetCurveVertexList()
00092                 :
00093                 ptList(new geom::CoordinateArraySequence()),
00094                 precisionModel(NULL),
00095                 minimumVertexDistance (0.0)
00096         {
00097         }
00098 
00099         ~OffsetCurveVertexList()
00100         {
00101                         delete ptList;
00102         }
00103         
00104         void setPrecisionModel(const geom::PrecisionModel* nPrecisionModel)
00105         {
00106                 precisionModel = nPrecisionModel;
00107         }
00108         
00109         void setMinimumVertexDistance(double nMinVertexDistance)
00110         {
00111                 minimumVertexDistance = nMinVertexDistance;
00112         }
00113         
00114         void addPt(const geom::Coordinate& pt)
00115         {
00116                 assert(precisionModel);
00117 
00118                 geom::Coordinate bufPt = pt;
00119                 precisionModel->makePrecise(bufPt);
00120                 // don't add duplicate (or near-duplicate) points
00121                 if (isDuplicate(bufPt))
00122                 {
00123                         return;
00124                 }
00125                 // we ask to allow repeated as we checked this ourself
00126                 // (JTS uses a vector for ptList, not a CoordinateSequence,
00127                 // we should do the same)
00128                 ptList->add(bufPt, true);
00129         }
00130         
00132         //
00134         void closeRing()
00135         {
00136                 if (ptList->size() < 1) return;
00137                 const geom::Coordinate& startPt = ptList->front();
00138                 const geom::Coordinate& lastPt = ptList->back();
00139                 if (startPt.equals(lastPt)) return;
00140                 // we ask to allow repeated as we checked this ourself
00141                 ptList->add(startPt, true);
00142         }
00143 
00145         //
00152         geom::CoordinateSequence* getCoordinates()
00153         {
00154                 closeRing();
00155                 geom::CoordinateSequence* ret = ptList;
00156                 ptList = 0;
00157                 return ret;
00158         }
00159 
00160         inline int size() const { return ptList ? ptList->size() : 0 ; }
00161 
00162 };
00163 
00164 std::ostream& operator<< (std::ostream& os, const OffsetCurveVertexList& lst)
00165 {
00166         if ( lst.ptList )
00167         {
00168                 os << *(lst.ptList);
00169         }
00170         else
00171         {
00172                 os << "empty (consumed?)";
00173         }
00174         return os;
00175 }
00176 
00177 } // namespace geos.operation.buffer
00178 } // namespace geos.operation
00179 } // namespace geos
00180 
00181 
00182 #endif // ndef GEOS_OP_BUFFER_OFFSETCURVEVERTEXLIST_H
00183 
00184 /**********************************************************************
00185  * $Log$
00186  **********************************************************************/
00187 

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