GEOS  3.3.8
TaggedLineStringSimplifier.h
1 /**********************************************************************
2  * $Id: TaggedLineStringSimplifier.h 3626 2012-05-09 18:02:09Z strk $
3  *
4  * GEOS - Geometry Engine Open Source
5  * http://geos.refractions.net
6  *
7  * Copyright (C) 2006 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 Licence as published
11  * by the Free Software Foundation.
12  * See the COPYING file for more information.
13  *
14  **********************************************************************
15  *
16  * Last port: simplify/TaggedLineStringSimplifier.java r536 (JTS-1.12+)
17  *
18  **********************************************************************
19  *
20  * NOTES: This class can be optimized to work with vector<Coordinate*>
21  * rather then with CoordinateSequence
22  *
23  **********************************************************************/
24 
25 #ifndef GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H
26 #define GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H
27 
28 #include <geos/export.h>
29 #include <cstddef>
30 #include <vector>
31 #include <memory>
32 
33 #ifdef _MSC_VER
34 #pragma warning(push)
35 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
36 #endif
37 
38 // Forward declarations
39 namespace geos {
40  namespace algorithm {
41  class LineIntersector;
42  }
43  namespace geom {
44  class CoordinateSequence;
45  class LineSegment;
46  }
47  namespace simplify {
48  class TaggedLineSegment;
49  class TaggedLineString;
50  class LineSegmentIndex;
51  }
52 }
53 
54 namespace geos {
55 namespace simplify { // geos::simplify
56 
57 
65 
66 public:
67 
68  TaggedLineStringSimplifier(LineSegmentIndex* inputIndex,
69  LineSegmentIndex* outputIndex);
70 
79  void setDistanceTolerance(double d);
80 
87  void simplify(TaggedLineString* line);
88 
89 
90 private:
91 
92  // externally owned
93  LineSegmentIndex* inputIndex;
94 
95  // externally owned
96  LineSegmentIndex* outputIndex;
97 
98  std::auto_ptr<algorithm::LineIntersector> li;
99 
101  TaggedLineString* line;
102 
103  const geom::CoordinateSequence* linePts;
104 
105  double distanceTolerance;
106 
107  void simplifySection(std::size_t i, std::size_t j,
108  std::size_t depth);
109 
110  static std::size_t findFurthestPoint(
111  const geom::CoordinateSequence* pts,
112  std::size_t i, std::size_t j,
113  double& maxDistance);
114 
115  bool hasBadIntersection(const TaggedLineString* parentLine,
116  const std::vector<std::size_t>& sectionIndex,
117  const geom::LineSegment& candidateSeg);
118 
119  bool hasBadInputIntersection(const TaggedLineString* parentLine,
120  const std::vector<std::size_t>& sectionIndex,
121  const geom::LineSegment& candidateSeg);
122 
123  bool hasBadOutputIntersection(const geom::LineSegment& candidateSeg);
124 
125  bool hasInteriorIntersection(const geom::LineSegment& seg0,
126  const geom::LineSegment& seg1) const;
127 
128  std::auto_ptr<TaggedLineSegment> flatten(
129  std::size_t start, std::size_t end);
130 
139  static bool isInLineSection(
140  const TaggedLineString* parentLine,
141  const std::vector<std::size_t>& sectionIndex,
142  const TaggedLineSegment* seg);
143 
152  void remove(const TaggedLineString* line,
153  std::size_t start,
154  std::size_t end);
155 
156 };
157 
158 inline void
160 {
161  distanceTolerance = d;
162 }
163 
164 } // namespace geos::simplify
165 } // namespace geos
166 
167 #ifdef _MSC_VER
168 #pragma warning(pop)
169 #endif
170 
171 #endif // GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H
172