/usr/include/geos/algorithm/HCoordinate.h is in libgeos++-dev 3.6.2-1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | /**********************************************************************
*
* GEOS - Geometry Engine Open Source
* http://geos.osgeo.org
*
* Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
* Copyright (C) 2005-2006 Refractions Research Inc.
* Copyright (C) 2001-2002 Vivid Solutions Inc.
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU Lesser General Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
*
* Last port: algorithm/HCoordinate.java r386 (JTS-1.12+)
*
**********************************************************************/
#ifndef GEOS_ALGORITHM_HCOORDINATE_H
#define GEOS_ALGORITHM_HCOORDINATE_H
#include <geos/export.h>
#include <iosfwd>
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
}
}
namespace geos {
namespace algorithm { // geos::algorithm
/** \brief
* Represents a homogeneous coordinate in a 2-D coordinate space.
*
* HCoordinate are used as a clean way
* of computing intersections between line segments.
*/
class GEOS_DLL HCoordinate {
public:
friend std::ostream& operator<< (std::ostream& o, const HCoordinate& c);
/** \brief
* Computes the (approximate) intersection point between two line
* segments using homogeneous coordinates.
*
* Note that this algorithm is
* not numerically stable; i.e. it can produce intersection points which
* lie outside the envelope of the line segments themselves. In order
* to increase the precision of the calculation input points should be
* normalized before passing them to this routine.
*/
static void intersection(const geom::Coordinate &p1,
const geom::Coordinate &p2,
const geom::Coordinate &q1,
const geom::Coordinate &q2,
geom::Coordinate &ret);
double x,y,w;
HCoordinate();
HCoordinate(double _x, double _y, double _w);
HCoordinate(const geom::Coordinate& p);
/** \brief
* Constructs a homogeneous coordinate which is the intersection
* of the lines define by the homogenous coordinates represented
* by two {@link Coordinate}s.
*
* @param p1
* @param p2
*/
HCoordinate(const geom::Coordinate& p1, const geom::Coordinate& p2);
HCoordinate(const geom::Coordinate& p1, const geom::Coordinate& p2,
const geom::Coordinate& q1, const geom::Coordinate& q2);
HCoordinate(const HCoordinate &p1, const HCoordinate &p2);
double getX() const;
double getY() const;
void getCoordinate(geom::Coordinate &ret) const;
};
std::ostream& operator<< (std::ostream& o, const HCoordinate& c);
} // namespace geos::algorithm
} // namespace geos
#endif // GEOS_ALGORITHM_HCOORDINATE_H
|