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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