GEOS  3.13.0dev
SnapOverlayOp.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2009 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: operation/overlay/snap/SnapOverlayOp.java r320 (JTS-1.12)
16  *
17  **********************************************************************/
18 
19 #pragma once
20 
21 #include <geos/precision/CommonBitsRemover.h> // for dtor visibility by unique_ptr
22 #include <geos/operation/overlayng/OverlayNG.h>
23 
24 #include <memory> // for unique_ptr
25 
26 #ifdef _MSC_VER
27 #pragma warning(push)
28 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
29 #endif
30 
31 // Forward declarations
32 namespace geos {
33 namespace geom {
34 class Geometry;
35 struct GeomPtrPair;
36 }
37 }
38 
39 namespace geos {
40 namespace operation { // geos::operation
41 namespace overlay { // geos::operation::overlay
42 namespace snap { // geos::operation::overlay::snap
43 
55 class GEOS_DLL SnapOverlayOp {
56 
57 public:
58 
59  static std::unique_ptr<geom::Geometry>
60  overlayOp(const geom::Geometry& g0, const geom::Geometry& g1, int opCode)
61  {
62  SnapOverlayOp op(g0, g1);
63  return op.getResultGeometry(opCode);
64  }
65 
66  static std::unique_ptr<geom::Geometry>
67  intersection(const geom::Geometry& g0, const geom::Geometry& g1)
68  {
69  return overlayOp(g0, g1, overlayng::OverlayNG::INTERSECTION);
70  }
71 
72  static std::unique_ptr<geom::Geometry>
73  Union(const geom::Geometry& g0, const geom::Geometry& g1)
74  {
75  return overlayOp(g0, g1, overlayng::OverlayNG::UNION);
76  }
77 
78  static std::unique_ptr<geom::Geometry>
79  difference(const geom::Geometry& g0, const geom::Geometry& g1)
80  {
81  return overlayOp(g0, g1, overlayng::OverlayNG::DIFFERENCE);
82  }
83 
84  static std::unique_ptr<geom::Geometry>
85  symDifference(const geom::Geometry& g0, const geom::Geometry& g1)
86  {
87  return overlayOp(g0, g1, overlayng::OverlayNG::SYMDIFFERENCE);
88  }
89 
90  SnapOverlayOp(const geom::Geometry& g1, const geom::Geometry& g2)
91  :
92  geom0(g1),
93  geom1(g2)
94  {
95  computeSnapTolerance();
96  }
97 
98  std::unique_ptr<geom::Geometry> getResultGeometry(int opCode);
99 
100 private:
101 
102  void computeSnapTolerance();
103 
104  void snap(geom::GeomPtrPair& ret);
105 
106  void removeCommonBits(const geom::Geometry& geom0,
107  const geom::Geometry& geom1,
108  geom::GeomPtrPair& ret);
109 
110  // re-adds common bits to the given geom
111  void prepareResult(geom::Geometry& geom);
112 
113 
114  const geom::Geometry& geom0;
115  const geom::Geometry& geom1;
116 
117  double snapTolerance;
118 
119  std::unique_ptr<precision::CommonBitsRemover> cbr;
120 
121  // Declare type as noncopyable
122  SnapOverlayOp(const SnapOverlayOp& other) = delete;
123  SnapOverlayOp& operator=(const SnapOverlayOp& rhs) = delete;
124 };
125 
126 } // namespace geos::operation::overlay::snap
127 } // namespace geos::operation::overlay
128 } // namespace geos::operation
129 } // namespace geos
130 
131 #ifdef _MSC_VER
132 #pragma warning(pop)
133 #endif
134 
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:186
Performs an overlay operation using snapping and enhanced precision to improve the robustness of the ...
Definition: SnapOverlayOp.h:55
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25