Implements a "hot pixel" as used in the Snap Rounding algorithm. More...

#include <HotPixel.h>

Collaboration diagram for geos::noding::snapround::HotPixel:

Public Member Functions
double	getWidth () const

double	getScaleFactor () const

	HotPixel (const geom::Coordinate &pt, double scaleFactor)

const geom::Coordinate &	getCoordinate () const

bool	intersects (const geom::Coordinate &p0, const geom::Coordinate &p1) const

bool	intersects (const geom::Coordinate &p) const

bool	isNode () const

void	setToNode ()

std::ostream &	operator<< (std::ostream &os)

Private Member Functions
double	scaleRound (double val) const

double	scale (double val) const

bool	intersectsPixelClosure (const geom::Coordinate &p0, const geom::Coordinate &p1) const

bool	intersectsScaled (double p0x, double p0y, double p1x, double p1y) const

	HotPixel (const HotPixel &other)=delete

HotPixel &	operator= (const HotPixel &rhs)=delete

Private Attributes
geom::Coordinate	originalPt

double	scaleFactor

bool	hpIsNode

double	hpx

double	hpy

Static Private Attributes
static constexpr double	TOLERANCE = 0.5

static constexpr int	UPPER_RIGHT = 0

static constexpr int	UPPER_LEFT = 1

static constexpr int	LOWER_LEFT = 2

static constexpr int	LOWER_RIGHT = 3

Detailed Description

Implements a "hot pixel" as used in the Snap Rounding algorithm.

A hot pixel contains the interior of the tolerance square and the boundary minus the top and right segments.

The hot pixel operations are all computed in the integer domain to avoid rounding problems.

Definition at line 63 of file HotPixel.h.

Constructor & Destructor Documentation

geos::noding::snapround::HotPixel::HotPixel ( const HotPixel & other )

privatedelete

geos::noding::snapround::HotPixel::HotPixel	(	const geom::Coordinate &	pt,
		double	scaleFactor
	)

Creates a new hot pixel.

Parameters

pt	the coordinate at the centre of the pixel. Will be kept by reference, so make sure to keep it alive.
scaleFactor	the scaleFactor determining the pixel size

Member Function Documentation

const geom::Coordinate& geos::noding::snapround::HotPixel::getCoordinate ( ) const

double geos::noding::snapround::HotPixel::getScaleFactor ( ) const

inline

Definition at line 104 of file HotPixel.h.

double geos::noding::snapround::HotPixel::getWidth ( ) const

inline

Gets the width of the hot pixel in the original coordinate system.

Definition at line 102 of file HotPixel.h.

bool geos::noding::snapround::HotPixel::intersects	(	const geom::Coordinate &	p0,
		const geom::Coordinate &	p1
	)		const

Tests whether the line segment (p0-p1) intersects this hot pixel.

Parameters

p0	the first coordinate of the line segment to test
p1	the second coordinate of the line segment to test

Returns: true if the line segment intersects this hot pixel

bool geos::noding::snapround::HotPixel::intersects ( const geom::Coordinate & p ) const

Tests whether a coordinate lies in (intersects) this hot pixel.

Parameters

p	the coordinate to test

Returns: true if the coordinate intersects this hot pixel

bool geos::noding::snapround::HotPixel::intersectsPixelClosure	(	const geom::Coordinate &	p0,
		const geom::Coordinate &	p1
	)		const

private

bool geos::noding::snapround::HotPixel::intersectsScaled	(	double	p0x,
		double	p0y,
		double	p1x,
		double	p1y
	)		const

private

bool geos::noding::snapround::HotPixel::isNode ( ) const

inline

Definition at line 139 of file HotPixel.h.

std::ostream& geos::noding::snapround::HotPixel::operator<< ( std::ostream & os )

HotPixel& geos::noding::snapround::HotPixel::operator= ( const HotPixel & rhs )

privatedelete

double geos::noding::snapround::HotPixel::scale ( double val ) const

private

double geos::noding::snapround::HotPixel::scaleRound ( double val ) const

private

void geos::noding::snapround::HotPixel::setToNode ( )

inline

Definition at line 140 of file HotPixel.h.

References geos::geom::operator<<().

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Member Data Documentation

bool geos::noding::snapround::HotPixel::hpIsNode

private

Definition at line 78 of file HotPixel.h.

double geos::noding::snapround::HotPixel::hpx

private

Definition at line 81 of file HotPixel.h.

double geos::noding::snapround::HotPixel::hpy

private

Definition at line 82 of file HotPixel.h.

constexpr int geos::noding::snapround::HotPixel::LOWER_LEFT = 2

staticprivate

Definition at line 71 of file HotPixel.h.

constexpr int geos::noding::snapround::HotPixel::LOWER_RIGHT = 3

staticprivate

Definition at line 72 of file HotPixel.h.

geom::Coordinate geos::noding::snapround::HotPixel::originalPt

private

Definition at line 74 of file HotPixel.h.

double geos::noding::snapround::HotPixel::scaleFactor

private

Definition at line 75 of file HotPixel.h.

constexpr double geos::noding::snapround::HotPixel::TOLERANCE = 0.5

staticprivate

Definition at line 67 of file HotPixel.h.

constexpr int geos::noding::snapround::HotPixel::UPPER_LEFT = 1

staticprivate

Definition at line 70 of file HotPixel.h.

constexpr int geos::noding::snapround::HotPixel::UPPER_RIGHT = 0

staticprivate

Definition at line 69 of file HotPixel.h.

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

HotPixel.h

Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation