GEOS  3.8.0dev
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 #ifndef GEOS_OP_LINEMERGE_LINEMERGER_H
20 #define GEOS_OP_LINEMERGE_LINEMERGER_H
21 
22 #include <geos/export.h>
23 #include <geos/operation/linemerge/LineMergeGraph.h> // for composition
24 
25 #include <vector>
26 
27 #ifdef _MSC_VER
28 #pragma warning(push)
29 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
30 #endif
31 
32 // Forward declarations
33 namespace geos {
34 namespace geom {
35 class LineString;
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  std::vector<geom::LineString*>* mergedLineStrings;
82 
83  std::vector<EdgeString*> edgeStrings;
84 
85  const geom::GeometryFactory* factory;
86 
87  void merge();
88 
89  void buildEdgeStringsForObviousStartNodes();
90 
91  void buildEdgeStringsForIsolatedLoops();
92 
93  void buildEdgeStringsForUnprocessedNodes();
94 
95  void buildEdgeStringsForNonDegree2Nodes();
96 
97  void buildEdgeStringsStartingAt(planargraph::Node* node);
98 
99  EdgeString* buildEdgeStringStartingWith(LineMergeDirectedEdge* start);
100 
101 public:
102  LineMerger();
103  ~LineMerger();
104 
113  void add(std::vector<geom::Geometry*>* geometries);
114 
123  void add(const geom::Geometry* geometry);
124 
131  std::vector<geom::LineString*>* getMergedLineStrings();
132 
133  void add(const geom::LineString* lineString);
134 
135 };
136 
137 } // namespace geos::operation::linemerge
138 } // namespace geos::operation
139 } // namespace geos
140 
141 #ifdef _MSC_VER
142 #pragma warning(pop)
143 #endif
144 
145 #endif // GEOS_OP_LINEMERGE_LINEMERGER_H
Sews together a set of fully noded LineStrings.
Definition: LineMerger.h:75
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:188
Definition: LineString.h:68
A planar graph of edges that is analyzed to sew the edges together.
Definition: LineMergeGraph.h:59
A sequence of LineMergeDirectedEdge forming one of the lines that will be output by the line-merging ...
Definition: EdgeString.h:56
Supplies a set of utility methods for building Geometry objects from CoordinateSequence or other Geom...
Definition: GeometryFactory.h:66
Basic namespace for all GEOS functionalities.
Definition: IndexedNestedRingTester.h:25
A node in a PlanarGraph is a location where 0 or more Edge meet.
Definition: planargraph/Node.h:45
A DirectedEdge of a LineMergeGraph.
Definition: LineMergeDirectedEdge.h:47