geos::algorithm::HCoordinate Class Reference

Represents a homogeneous coordinate in a 2-D coordinate space. More...

#include <HCoordinate.h>

Public Member Functions
	HCoordinate ()
	HCoordinate (double _x, double _y, double _w)
	HCoordinate (const geom::Coordinate &p)
	HCoordinate (const geom::Coordinate &p1, const geom::Coordinate &p2)
	Constructs a homogeneous coordinate which is the intersection of the lines define by the homogenous coordinates represented by two Coordinates. More...
	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

Static Public Member Functions
static void	intersection (const geom::Coordinate &p1, const geom::Coordinate &p2, const geom::Coordinate &q1, const geom::Coordinate &q2, geom::Coordinate &ret)
	Computes the (approximate) intersection point between two line segments using homogeneous coordinates. More...

Public Attributes
double	x
double	y
double	w

Friends
std::ostream &	operator<< (std::ostream &o, const HCoordinate &c)

Detailed Description

Represents a homogeneous coordinate in a 2-D coordinate space.

HCoordinate are used as a clean way of computing intersections between line segments.

Definition at line 44 of file HCoordinate.h.

Constructor & Destructor Documentation

geos::algorithm::HCoordinate::HCoordinate

(

)

geos::algorithm::HCoordinate::HCoordinate	(	double	_x,
		double	_y,
		double	_w
	)

geos::algorithm::HCoordinate::HCoordinate

(

const geom::Coordinate &

p

)

geos::algorithm::HCoordinate::HCoordinate	(	const geom::Coordinate &	p1,
		const geom::Coordinate &	p2
	)

Constructs a homogeneous coordinate which is the intersection of the lines define by the homogenous coordinates represented by two Coordinates.

Parameters

p1
p2

geos::algorithm::HCoordinate::HCoordinate	(	const geom::Coordinate &	p1,
		const geom::Coordinate &	p2,
		const geom::Coordinate &	q1,
		const geom::Coordinate &	q2
	)

geos::algorithm::HCoordinate::HCoordinate	(	const HCoordinate &	p1,
		const HCoordinate &	p2
	)

Member Function Documentation

void geos::algorithm::HCoordinate::getCoordinate

(

geom::Coordinate &

ret

)

const

double geos::algorithm::HCoordinate::getX

(

)

const

double geos::algorithm::HCoordinate::getY

(

)

const

static void geos::algorithm::HCoordinate::intersection ( const geom::Coordinate &  p1, const geom::Coordinate &  p2, const geom::Coordinate &  q1, const geom::Coordinate &  q2, geom::Coordinate &  ret  )

static

Computes the (approximate) intersection point between two line segments using homogeneous coordinates.

Note

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.

Friends And Related Function Documentation

std::ostream& operator<< ( std::ostream &  o, const HCoordinate &  c  )

friend

Member Data Documentation

double geos::algorithm::HCoordinate::w

Definition at line 66 of file HCoordinate.h.

double geos::algorithm::HCoordinate::x

Definition at line 66 of file HCoordinate.h.

double geos::algorithm::HCoordinate::y

Definition at line 66 of file HCoordinate.h.

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The documentation for this class was generated from the following file:

• HCoordinate.h