GEOS  3.11.0beta2
RayCrossingCounterDD.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2018 Paul Ramsey <pramsey@cleverelephant.ca>
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  *
16  * Last port: algorithm/RayCrossingCounterDD.java rev. 1.2 (JTS-1.9)
17  *
18  **********************************************************************/
19 
20 #pragma once
21 
22 #include <geos/export.h>
23 #include <geos/geom/Location.h>
24 
25 #include <vector>
26 
27 // forward declarations
28 namespace geos {
29 namespace geom {
30 class Coordinate;
31 class CoordinateSequence;
32 }
33 }
34 
35 
36 namespace geos {
37 namespace algorithm {
38 
63 class GEOS_DLL RayCrossingCounterDD {
64 private:
65  const geom::Coordinate& point;
66 
67  int crossingCount;
68 
69  // true if the test point lies on an input segment
70  bool isPointOnSegment;
71 
72  // Declare type as noncopyable
73  RayCrossingCounterDD(const RayCrossingCounterDD& other) = delete;
74  RayCrossingCounterDD& operator=(const RayCrossingCounterDD& rhs) = delete;
75 
76 public:
86  const geom::CoordinateSequence& ring);
87 
90  const std::vector<const geom::Coordinate*>& ring);
91 
104  static int orientationIndex(const geom::Coordinate& p1,
105  const geom::Coordinate& p2,
106  const geom::Coordinate& q);
107 
108  RayCrossingCounterDD(const geom::Coordinate& p_point):
109  point(p_point),
110  crossingCount(0),
111  isPointOnSegment(false)
112  { }
113 
121  const geom::Coordinate& p2);
122 
132  bool
134  {
135  return isPointOnSegment;
136  }
137 
148 
159 
160 };
161 
162 } // geos::algorithm
163 } // geos
164 
Counts the number of segments crossed by a horizontal ray extending to the right from a given point,...
Definition: RayCrossingCounterDD.h:63
static geom::Location locatePointInRing(const geom::Coordinate &p, const std::vector< const geom::Coordinate * > &ring)
Semantically equal to the above, just different args encoding.
bool isPointInPolygon()
Tests whether the point lies in or on the ring, polygon or multipolygon from which the processed segm...
geom::Location getLocation()
Gets the Location of the point relative to the ring, polygon or multipolygon from which the processed...
bool isOnSegment()
Reports whether the point lies exactly on one of the supplied segments.
Definition: RayCrossingCounterDD.h:133
void countSegment(const geom::Coordinate &p1, const geom::Coordinate &p2)
Counts a segment.
static geom::Location locatePointInRing(const geom::Coordinate &p, const geom::CoordinateSequence &ring)
Determines the Location of a point in a ring. This method is an exemplar of how to use this class.
static int orientationIndex(const geom::Coordinate &p1, const geom::Coordinate &p2, const geom::Coordinate &q)
Returns the index of the direction of the point q relative to a vector specified by p1-p2.
The internal representation of a list of coordinates inside a Geometry.
Definition: CoordinateSequence.h:44
Coordinate is the lightweight class used to store coordinates.
Definition: Coordinate.h:58
Location
Constants representing the location of a point relative to a geometry.
Definition: Location.h:32
Basic namespace for all GEOS functionalities.
Definition: Angle.h:25