GEOS  3.3.3
OffsetCurveBuilder.h
1 /**********************************************************************
2  * $Id: OffsetCurveBuilder.h 3301 2011-04-27 09:42:31Z strk $
3  *
4  * GEOS - Geometry Engine Open Source
5  * http://geos.refractions.net
6  *
7  * Copyright (C) 2009-2011 Sandro Santilli <strk@keybit.net>
8  * Copyright (C) 2006-2007 Refractions Research Inc.
9  *
10  * This is free software; you can redistribute and/or modify it under
11  * the terms of the GNU Lesser General Public Licence as published
12  * by the Free Software Foundation.
13  * See the COPYING file for more information.
14  *
15  **********************************************************************
16  *
17  * Last port: operation/buffer/OffsetCurveBuilder.java r378 (JTS-1.12)
18  *
19  **********************************************************************/
20 
21 #ifndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
22 #define GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
23 
24 #include <geos/export.h>
25 
26 #include <geos/operation/buffer/BufferParameters.h> // for composition
27 #include <geos/operation/buffer/OffsetSegmentGenerator.h>
28 
29 #include <vector>
30 #include <memory> // for auto_ptr
31 
32 #ifdef _MSC_VER
33 #pragma warning(push)
34 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
35 #endif
36 
37 // Forward declarations
38 namespace geos {
39  namespace geom {
40  class CoordinateSequence;
41  class PrecisionModel;
42  }
43 }
44 
45 namespace geos {
46 namespace operation { // geos.operation
47 namespace buffer { // geos.operation.buffer
48 
63 class GEOS_DLL OffsetCurveBuilder {
64 public:
65 
66  /*
67  * @param nBufParams buffer parameters, this object will
68  * keep a reference to the passed parameters
69  * so caller must make sure the object is
70  * kept alive for the whole lifetime of
71  * the buffer builder.
72  */
73  OffsetCurveBuilder(const geom::PrecisionModel *newPrecisionModel,
74  const BufferParameters& nBufParams)
75  :
76  distance(0.0),
77  precisionModel(newPrecisionModel),
78  bufParams(nBufParams)
79  {}
80 
86  const BufferParameters& getBufferParameters() const
87  {
88  return bufParams;
89  }
90 
100  void getLineCurve(const geom::CoordinateSequence* inputPts,
101  double distance,
102  std::vector<geom::CoordinateSequence*>& lineList);
103 
120  void getSingleSidedLineCurve(const geom::CoordinateSequence* inputPts,
121  double distance, std::vector<geom::CoordinateSequence*>& lineList,
122  bool leftSide, bool rightSide ) ;
123 
131  void getRingCurve(const geom::CoordinateSequence *inputPts, int side,
132  double distance,
133  std::vector<geom::CoordinateSequence*>& lineList);
134 
135 
136 private:
137 
138  double distance;
139 
140  const geom::PrecisionModel* precisionModel;
141 
142  const BufferParameters& bufParams;
143 
151  static const double SIMPLIFY_FACTOR; // 100.0;
152 
160  double simplifyTolerance(double bufDistance);
161 
162  void computeLineBufferCurve(const geom::CoordinateSequence& inputPts,
163  OffsetSegmentGenerator& segGen);
164 
165  void computeSingleSidedBufferCurve(const geom::CoordinateSequence& inputPts,
166  bool isRightSide,
167  OffsetSegmentGenerator& segGen);
168 
169  void computeRingBufferCurve(const geom::CoordinateSequence& inputPts,
170  int side, OffsetSegmentGenerator& segGen);
171 
172  std::auto_ptr<OffsetSegmentGenerator> getSegGen(double dist);
173 
174  void computePointCurve(const geom::Coordinate& pt,
175  OffsetSegmentGenerator& segGen);
176 
177 
178  // Declare type as noncopyable
180  OffsetCurveBuilder& operator=(const OffsetCurveBuilder& rhs);
181 };
182 
183 } // namespace geos::operation::buffer
184 } // namespace geos::operation
185 } // namespace geos
186 
187 #ifdef _MSC_VER
188 #pragma warning(pop)
189 #endif
190 
191 #endif // ndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
192