GEOS  3.8.0
OverlapUnion.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://trac.osgeo.org/geos
5  *
6  * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
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: ORIGINAL WORK, generalization of CascadedPolygonUnion
16  *
17  **********************************************************************/
18 
19 #ifndef GEOS_OP_UNION_OVERLAPUNION_H
20 #define GEOS_OP_UNION_OVERLAPUNION_H
21 
22 #include <geos/export.h>
23 
24 #include <vector>
25 #include <algorithm>
26 #include <unordered_set>
27 
28 #include <geos/geom/Geometry.h>
29 
30 // Forward declarations
31 namespace geos {
32 namespace geom {
33 class Envelope;
34 class LineSegment;
35 }
36 }
37 
38 namespace geos {
39 namespace operation { // geos::operation
40 namespace geounion { // geos::operation::geounion
41 
90 class GEOS_DLL OverlapUnion {
91 
92 public:
93 
94  OverlapUnion(const geom::Geometry* p_g0, const geom::Geometry* p_g1)
95  : g0(p_g0), g1(p_g1)
96  {
97  geomFactory = g0->getFactory();
98  isUnionSafe = false;
99  };
100 
101  std::unique_ptr<geom::Geometry> doUnion();
102 
103 private:
104 
105  const geom::GeometryFactory* geomFactory;
106  const geom::Geometry* g0;
107  const geom::Geometry* g1;
108  bool isUnionSafe;
109 
110  geom::Envelope overlapEnvelope(const geom::Geometry* geom0, const geom::Geometry* geom1);
111  std::unique_ptr<geom::Geometry> extractByEnvelope(const geom::Envelope& env, const geom::Geometry* geom, std::vector<std::unique_ptr<geom::Geometry>>& disjointGeoms);
112  std::unique_ptr<geom::Geometry> combine(std::unique_ptr<geom::Geometry>& unionGeom, std::vector<std::unique_ptr<geom::Geometry>>& disjointPolys);
113  std::unique_ptr<geom::Geometry> unionFull(const geom::Geometry* geom0, const geom::Geometry* geom1);
114  std::unique_ptr<geom::Geometry> unionBuffer(const geom::Geometry* geom0, const geom::Geometry* geom1);
115  bool isBorderSegmentsSame(const geom::Geometry* result, const geom::Envelope& env);
116  bool isEqual(std::vector<geom::LineSegment*>& segs0, std::vector<geom::LineSegment*>& segs1);
117  std::vector<geom::LineSegment*> extractBorderSegments(const geom::Geometry* geom0, const geom::Geometry* geom1, const geom::Envelope& env);
118  void extractBorderSegments(const geom::Geometry* geom, const geom::Envelope& penv, std::vector<geom::LineSegment*>& psegs);
119 
120 };
121 
122 } // namespace geos::operation::union
123 } // namespace geos::operation
124 } // namespace geos
125 
126 #endif
An Envelope defines a rectangulare region of the 2D coordinate plane.
Definition: Envelope.h:58
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:188
Definition: OverlapUnion.h:90
Supplies a set of utility methods for building Geometry objects from CoordinateSequence or other Geom...
Definition: GeometryFactory.h:68
Basic namespace for all GEOS functionalities.
Definition: IndexedNestedRingTester.h:25