GEOS 3.9.1
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#ifndef GEOS_ALGORITHM_RAYCROSSINGCOUNTERDD_H
21#define GEOS_ALGORITHM_RAYCROSSINGCOUNTERDD_H
22
23#include <geos/export.h>
24#include <geos/geom/Location.h>
25
26#include <vector>
27
28// forward declarations
29namespace geos {
30namespace geom {
31class Coordinate;
32class CoordinateSequence;
33}
34}
35
36
37namespace geos {
38namespace algorithm {
39
64class GEOS_DLL RayCrossingCounterDD {
65private:
66 const geom::Coordinate& point;
67
68 int crossingCount;
69
70 // true if the test point lies on an input segment
71 bool isPointOnSegment;
72
73 // Declare type as noncopyable
74 RayCrossingCounterDD(const RayCrossingCounterDD& other) = delete;
75 RayCrossingCounterDD& operator=(const RayCrossingCounterDD& rhs) = delete;
76
77public:
87 const geom::CoordinateSequence& ring);
88
91 const std::vector<const geom::Coordinate*>& ring);
92
105 static int orientationIndex(const geom::Coordinate& p1,
106 const geom::Coordinate& p2,
107 const geom::Coordinate& q);
108
110 point(p_point),
111 crossingCount(0),
112 isPointOnSegment(false)
113 { }
114
122 const geom::Coordinate& p2);
123
133 bool
135 {
136 return isPointOnSegment;
137 }
138
149
160
161};
162
163} // geos::algorithm
164} // geos
165
166#endif // GEOS_ALGORITHM_RAYCROSSINGCOUNTERDD_H
Counts the number of segments crossed by a horizontal ray extending to the right from a given point,...
Definition RayCrossingCounterDD.h:64
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:134
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:58
Coordinate is the lightweight class used to store coordinates.
Definition Coordinate.h:60
Location
Constants representing the location of a point relative to a geometry.
Definition Location.h:34
Basic namespace for all GEOS functionalities.
Definition IndexedNestedRingTester.h:26