GEOS  3.11.0
HotPixel.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/snapround/HotPixel.java r320 (JTS-1.12)
16  *
17  **********************************************************************/
18 
19 #pragma once
20 
21 #include <geos/export.h>
22 
23 #include <geos/geom/Coordinate.h> // for composition
24 #include <geos/geom/Envelope.h> // for unique_ptr
25 #include <geos/io/WKTWriter.h>
26 #include <geos/util/math.h>
27 
28 #include <array>
29 
30 #ifdef _MSC_VER
31 #pragma warning(push)
32 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
33 #endif
34 
35 // Forward declarations
36 namespace geos {
37 namespace geom {
38 class Envelope;
39 }
40 namespace algorithm {
41 class LineIntersector;
42 }
43 namespace noding {
44 class NodedSegmentString;
45 }
46 }
47 
48 namespace geos {
49 namespace noding { // geos::noding
50 namespace snapround { // geos::noding::snapround
51 
61 class GEOS_DLL HotPixel {
62 
63 private:
64 
65  static constexpr double TOLERANCE = 0.5;
66 
67  static constexpr int UPPER_RIGHT = 0;
68  static constexpr int UPPER_LEFT = 1;
69  static constexpr int LOWER_LEFT = 2;
70  static constexpr int LOWER_RIGHT = 3;
71 
72  geom::Coordinate originalPt;
73  double scaleFactor;
74 
75  /* Indicates if this hot pixel must be a node in the output. */
76  bool hpIsNode;
77 
78  /* The scaled ordinates of the hot pixel point */
79  double hpx;
80  double hpy;
81 
82  double scaleRound(double val) const
83  {
84  // Use Java-compatible round implementation
85  return util::round(val * scaleFactor);
86  };
87 
88  double scale(double val) const
89  {
90  return val * scaleFactor;
91  };
92 
93  bool intersectsPixelClosure(const geom::Coordinate& p0,
94  const geom::Coordinate& p1) const;
95 
96  bool intersectsScaled(double p0x, double p0y, double p1x, double p1y) const;
97 
98  // Declare type as noncopyable
99  HotPixel(const HotPixel& other) = delete;
100  HotPixel& operator=(const HotPixel& rhs) = delete;
101 
102 public:
103 
107  double getWidth() const { return 1.0 / scaleFactor; };
108 
109  double getScaleFactor() const { return scaleFactor; };
110 
117  HotPixel(const geom::Coordinate& pt, double scaleFactor);
118 
119  /*
120  * Gets the coordinate this hot pixel is based at.
121  *
122  * @return the coordinate of the pixel
123  */
124  const geom::Coordinate& getCoordinate() const;
125 
133  bool intersects(const geom::Coordinate& p0,
134  const geom::Coordinate& p1) const;
135 
142  bool intersects(const geom::Coordinate& p) const;
143 
144  bool isNode() const { return hpIsNode; };
145  void setToNode() { hpIsNode = true; };
146 
147  std::ostream& operator<< (std::ostream& os);
148 };
149 
150 } // namespace geos::noding::snapround
151 } // namespace geos::noding
152 } // namespace geos
153 
154 #ifdef _MSC_VER
155 #pragma warning(pop)
156 #endif
157 
Coordinate is the lightweight class used to store coordinates.
Definition: Coordinate.h:58
Implements a "hot pixel" as used in the Snap Rounding algorithm.
Definition: HotPixel.h:61
HotPixel(const geom::Coordinate &pt, double scaleFactor)
bool intersects(const geom::Coordinate &p0, const geom::Coordinate &p1) const
bool intersects(const geom::Coordinate &p) const
double getWidth() const
Definition: HotPixel.h:107
double round(double val)
Definition: math.h:36
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25