GEOS  3.4.2
OffsetCurveBuilder.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2009-2011 Sandro Santilli <strk@keybit.net>
7  * Copyright (C) 2006-2007 Refractions Research Inc.
8  *
9  * This is free software; you can redistribute and/or modify it under
10  * the terms of the GNU Lesser General Public Licence as published
11  * by the Free Software Foundation.
12  * See the COPYING file for more information.
13  *
14  **********************************************************************
15  *
16  * Last port: operation/buffer/OffsetCurveBuilder.java r378 (JTS-1.12)
17  *
18  **********************************************************************/
19 
20 #ifndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
21 #define GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
22 
23 #include <geos/export.h>
24 
25 #include <geos/operation/buffer/BufferParameters.h> // for composition
26 #include <geos/operation/buffer/OffsetSegmentGenerator.h>
27 
28 #include <vector>
29 #include <memory> // for auto_ptr
30 
31 #ifdef _MSC_VER
32 #pragma warning(push)
33 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
34 #endif
35 
36 // Forward declarations
37 namespace geos {
38  namespace geom {
39  class CoordinateSequence;
40  class PrecisionModel;
41  }
42 }
43 
44 namespace geos {
45 namespace operation { // geos.operation
46 namespace buffer { // geos.operation.buffer
47 
62 class GEOS_DLL OffsetCurveBuilder {
63 public:
64 
65  /*
66  * @param nBufParams buffer parameters, this object will
67  * keep a reference to the passed parameters
68  * so caller must make sure the object is
69  * kept alive for the whole lifetime of
70  * the buffer builder.
71  */
72  OffsetCurveBuilder(const geom::PrecisionModel *newPrecisionModel,
73  const BufferParameters& nBufParams)
74  :
75  distance(0.0),
76  precisionModel(newPrecisionModel),
77  bufParams(nBufParams)
78  {}
79 
86  {
87  return bufParams;
88  }
89 
99  void getLineCurve(const geom::CoordinateSequence* inputPts,
100  double distance,
101  std::vector<geom::CoordinateSequence*>& lineList);
102 
119  void getSingleSidedLineCurve(const geom::CoordinateSequence* inputPts,
120  double distance, std::vector<geom::CoordinateSequence*>& lineList,
121  bool leftSide, bool rightSide ) ;
122 
130  void getRingCurve(const geom::CoordinateSequence *inputPts, int side,
131  double distance,
132  std::vector<geom::CoordinateSequence*>& lineList);
133 
134 
135 private:
136 
137  double distance;
138 
139  const geom::PrecisionModel* precisionModel;
140 
141  const BufferParameters& bufParams;
142 
150  static const double SIMPLIFY_FACTOR; // 100.0;
151 
159  double simplifyTolerance(double bufDistance);
160 
161  void computeLineBufferCurve(const geom::CoordinateSequence& inputPts,
162  OffsetSegmentGenerator& segGen);
163 
164  void computeSingleSidedBufferCurve(const geom::CoordinateSequence& inputPts,
165  bool isRightSide,
166  OffsetSegmentGenerator& segGen);
167 
168  void computeRingBufferCurve(const geom::CoordinateSequence& inputPts,
169  int side, OffsetSegmentGenerator& segGen);
170 
171  std::auto_ptr<OffsetSegmentGenerator> getSegGen(double dist);
172 
173  void computePointCurve(const geom::Coordinate& pt,
174  OffsetSegmentGenerator& segGen);
175 
176 
177  // Declare type as noncopyable
179  OffsetCurveBuilder& operator=(const OffsetCurveBuilder& rhs);
180 };
181 
182 } // namespace geos::operation::buffer
183 } // namespace geos::operation
184 } // namespace geos
185 
186 #ifdef _MSC_VER
187 #pragma warning(pop)
188 #endif
189 
190 #endif // ndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
191 
Definition: OffsetSegmentGenerator.h:61
Coordinate is the lightweight class used to store coordinates.
Definition: Coordinate.h:60
Specifies the precision model of the Coordinate in a Geometry.
Definition: PrecisionModel.h:87
Computes the raw offset curve for a single Geometry component (ring, line or point).
Definition: OffsetCurveBuilder.h:62
const BufferParameters & getBufferParameters() const
Definition: OffsetCurveBuilder.h:85
Contains the parameters which describe how a buffer should be constructed.
Definition: BufferParameters.h:57
The internal representation of a list of coordinates inside a Geometry.
Definition: CoordinateSequence.h:59