GEOS  3.12.0dev
LineMerger.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: operation/linemerge/LineMerger.java r378 (JTS-1.12)
16  *
17  **********************************************************************/
18 
19 #pragma once
20 
21 #include <geos/export.h>
22 #include <geos/geom/LineString.h>
23 #include <geos/operation/linemerge/LineMergeGraph.h> // for composition
24 
25 #include <memory>
26 #include <vector>
27 
28 #ifdef _MSC_VER
29 #pragma warning(push)
30 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
31 #endif
32 
33 // Forward declarations
34 namespace geos {
35 namespace geom {
36 class GeometryFactory;
37 class Geometry;
38 }
39 namespace planargraph {
40 class Node;
41 }
42 namespace operation {
43 namespace linemerge {
44 class EdgeString;
45 class LineMergeDirectedEdge;
46 }
47 }
48 }
49 
50 
51 namespace geos {
52 namespace operation { // geos::operation
53 namespace linemerge { // geos::operation::linemerge
54 
75 class GEOS_DLL LineMerger {
76 
77 private:
78 
79  LineMergeGraph graph;
80 
81  bool isDirected;
82 
83  std::vector<std::unique_ptr<geom::LineString>> mergedLineStrings;
84 
85  std::vector<EdgeString*> edgeStrings;
86 
87  const geom::GeometryFactory* factory;
88 
89  void merge();
90 
91  void buildEdgeStringsForObviousStartNodes();
92 
93  void buildEdgeStringsForIsolatedLoops();
94 
95  void buildEdgeStringsForUnprocessedNodes();
96 
97  void buildEdgeStringsForNonDegree2Nodes();
98 
99  void buildEdgeStringsStartingAt(planargraph::Node* node);
100 
101  EdgeString* buildEdgeStringStartingWith(LineMergeDirectedEdge* start);
102 
103 public:
104  LineMerger(bool directed = false);
105  ~LineMerger();
106 
115  void add(std::vector<const geom::Geometry*>* geometries);
116 
125  void add(const geom::Geometry* geometry);
126 
133  std::vector<std::unique_ptr<geom::LineString>> getMergedLineStrings();
134 
135  void add(const geom::LineString* lineString);
136 
137  // Declare type as noncopyable
138  LineMerger(const LineMerger& other) = delete;
139  LineMerger& operator=(const LineMerger& rhs) = delete;
140 };
141 
142 } // namespace geos::operation::linemerge
143 } // namespace geos::operation
144 } // namespace geos
145 
146 #ifdef _MSC_VER
147 #pragma warning(pop)
148 #endif
149 
geos
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25
geos::operation::linemerge::LineMergeDirectedEdge
A DirectedEdge of a LineMergeGraph.
Definition: LineMergeDirectedEdge.h:46
geos::operation::linemerge::LineMergeGraph
A planar graph of edges that is analyzed to sew the edges together.
Definition: LineMergeGraph.h:58
geos::operation::linemerge::LineMerger
Sews together a set of fully noded LineStrings.
Definition: LineMerger.h:75
geos::geom::Geometry
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:186
geos::operation::linemerge::EdgeString
A sequence of LineMergeDirectedEdge forming one of the lines that will be output by the line-merging ...
Definition: EdgeString.h:54
geos::planargraph::Node
A node in a PlanarGraph is a location where 0 or more Edge meet.
Definition: planargraph/Node.h:44
geos::geom::GeometryFactory
Supplies a set of utility methods for building Geometry objects from CoordinateSequence or other Geom...
Definition: GeometryFactory.h:66
geos::geom::LineString
Definition: LineString.h:66