GEOS  3.11.0rc0
SegmentNodeList.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2006 Refractions Research Inc.
7  *
8  * This is free software; you can redistribute and/or modify it under
9  * the terms of the GNU Lesser General Public Licence as published
10  * by the Free Software Foundation.
11  * See the COPYING file for more information.
12  *
13  **********************************************************************
14  *
15  * Last port: noding/SegmentNodeList.java rev. 1.8 (JTS-1.10)
16  *
17  **********************************************************************/
18 
19 #pragma once
20 
21 #include <geos/export.h>
22 
23 #include <cassert>
24 #include <iostream>
25 #include <vector>
26 #include <set>
27 #include <memory>
28 
29 #include <geos/noding/SegmentNode.h> // for composition
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 }
41 namespace noding {
42 class SegmentString;
43 class NodedSegmentString;
44 }
45 }
46 
47 namespace geos {
48 namespace noding { // geos::noding
49 
54 class GEOS_DLL SegmentNodeList {
55 private:
56  // Since we are adding frequently to the SegmentNodeList and iterating infrequently,
57  // it is faster to store all the SegmentNodes in a vector and sort/remove duplicates
58  // before iteration, rather than storing them in a set and continuously maintaining
59  // a sorted order.
60  mutable std::vector<SegmentNode> nodeMap;
61  mutable bool ready = false;
62 
63  void prepare() const;
64 
65  // the parent edge
66  const NodedSegmentString& edge;
67 
74  void checkSplitEdgesCorrectness(const std::vector<SegmentString*>& splitEdges) const;
75 
84  std::unique_ptr<SegmentString> createSplitEdge(const SegmentNode* ei0, const SegmentNode* ei1) const;
85 
96  std::unique_ptr<geom::CoordinateSequence> createSplitEdgePts(const SegmentNode* ei0, const SegmentNode* ei1) const;
97 
106  void addCollapsedNodes();
107 
112  void findCollapsesFromExistingVertices(
113  std::vector<std::size_t>& collapsedVertexIndexes) const;
114 
122  void findCollapsesFromInsertedNodes(
123  std::vector<std::size_t>& collapsedVertexIndexes) const;
124 
125  static bool findCollapseIndex(const SegmentNode& ei0, const SegmentNode& ei1,
126  size_t& collapsedVertexIndex);
127 
128  void addEdgeCoordinates(const SegmentNode* ei0, const SegmentNode* ei1, std::vector<geom::Coordinate>& coordList) const;
129 
130 public:
131 
132  // Declare type as noncopyable
133  SegmentNodeList(const SegmentNodeList& other) = delete;
134  SegmentNodeList& operator=(const SegmentNodeList& rhs) = delete;
135 
136  friend std::ostream& operator<< (std::ostream& os, const SegmentNodeList& l);
137 
138  using container = decltype(nodeMap);
139  using iterator = container::iterator;
140  using const_iterator = container::const_iterator;
141 
142  explicit SegmentNodeList(const NodedSegmentString* newEdge): edge(*newEdge) {}
143 
144  explicit SegmentNodeList(const NodedSegmentString& newEdge): edge(newEdge) {}
145 
146  ~SegmentNodeList() = default;
147 
148  const NodedSegmentString&
149  getEdge() const
150  {
151  return edge;
152  }
153 
164  void add(const geom::Coordinate& intPt, std::size_t segmentIndex);
165 
166  void
167  add(const geom::Coordinate* intPt, std::size_t segmentIndex)
168  {
169  add(*intPt, segmentIndex);
170  }
171 
173  size_t
174  size() const
175  {
176  prepare();
177  return nodeMap.size();
178  }
179 
180  iterator begin() {
181  prepare();
182  return nodeMap.begin();
183  }
184 
185  const_iterator begin() const {
186  prepare();
187  return nodeMap.begin();
188  }
189 
190  iterator end() {
191  prepare();
192  return nodeMap.end();
193  }
194 
195  const_iterator end() const {
196  prepare();
197  return nodeMap.end();
198  }
199 
203  void addEndpoints();
204 
211  void addSplitEdges(std::vector<SegmentString*>& edgeList);
212 
213  void
214  addSplitEdges(std::vector<SegmentString*>* edgeList)
215  {
216  assert(edgeList);
217  addSplitEdges(*edgeList);
218  }
219 
229  std::vector<geom::Coordinate> getSplitCoordinates();
230 
231 
232 };
233 
234 std::ostream& operator<< (std::ostream& os, const SegmentNodeList& l);
235 
236 } // namespace geos::noding
237 } // namespace geos
238 
239 #ifdef _MSC_VER
240 #pragma warning(pop)
241 #endif
242 
Coordinate is the lightweight class used to store coordinates.
Definition: Coordinate.h:58
Represents a list of contiguous line segments, and supports noding the segments.
Definition: NodedSegmentString.h:59
A list of the SegmentNode present along a NodedSegmentString.
Definition: SegmentNodeList.h:54
void add(const geom::Coordinate &intPt, std::size_t segmentIndex)
void addSplitEdges(std::vector< SegmentString * > &edgeList)
std::vector< geom::Coordinate > getSplitCoordinates()
size_t size() const
Return the number of nodes in this list.
Definition: SegmentNodeList.h:174
Represents an intersection point between two NodedSegmentString.
Definition: SegmentNode.h:45
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25