geos::geom::util::SineStarFactory Class Reference

#include <SineStarFactory.h>

Inheritance diagram for geos::geom::util::SineStarFactory:

Public Member Functions
	SineStarFactory (const geom::GeometryFactory *fact)
void	setNumArms (int nArms)
void	setArmLengthRatio (double armLenRatio)
std::unique_ptr< Polygon >	createSineStar () const
Public Member Functions inherited from geos::util::GeometricShapeFactory
	GeometricShapeFactory (const geom::GeometryFactory *factory)
	Create a shape factory which will create shapes using the given GeometryFactory.
std::unique_ptr< geom::LineString >	createArc (double startAng, double angExtent)
	Creates an elliptical arc, as a LineString.
std::unique_ptr< geom::Polygon >	createArcPolygon (double startAng, double angExt)
	Creates an elliptical arc polygon.
std::unique_ptr< geom::Polygon >	createCircle ()
	Creates a circular Polygon.
std::unique_ptr< geom::Polygon >	createRectangle ()
	Creates a rectangular Polygon.
void	setBase (const geom::CoordinateXY &base)
	Sets the location of the shape by specifying the base coordinate (which in most cases is the * lower left point of the envelope containing the shape).
void	setCentre (const geom::CoordinateXY &centre)
	Sets the location of the shape by specifying the centre of the shape's bounding box.
void	setHeight (double height)
	Sets the height of the shape.
void	setNumPoints (uint32_t nNPts)
	Sets the total number of points in the created Geometry.
void	setSize (double size)
	Sets the size of the extent of the shape in both x and y directions.
void	setWidth (double width)
	Sets the width of the shape.

Protected Attributes
int	numArms
double	armLengthRatio
Protected Attributes inherited from geos::util::GeometricShapeFactory
const geom::GeometryFactory *	geomFact
const geom::PrecisionModel *	precModel
Dimensions	dim
uint32_t	nPts

Additional Inherited Members
Protected Member Functions inherited from geos::util::GeometricShapeFactory
geom::CoordinateXY	coord (double x, double y) const

Detailed Description

Creates geometries which are shaped like multi-armed stars with each arm shaped like a sine wave. These kinds of geometries are useful as a more complex geometry for testing algorithms.

Author

Martin Davis

Constructor & Destructor Documentation

SineStarFactory()

geos::geom::util::SineStarFactory::SineStarFactory ( const geom::GeometryFactory *  fact )

inline

Creates a factory which will create sine stars using the given GeometryFactory.

Parameters

fact	the factory to use. You need to keep the factory alive for the whole SineStarFactory life time.

Member Function Documentation

createSineStar()

std::unique_ptr< Polygon > geos::geom::util::SineStarFactory::createSineStar

(

)

const

Generates the geometry for the sine star

Returns

the geometry representing the sine star

setArmLengthRatio()

void geos::geom::util::SineStarFactory::setArmLengthRatio ( double  armLenRatio )

inline

Sets the ration of the length of each arm to the distance from the tip of the arm to the centre of the star. Value should be between 0.0 and 1.0

Parameters

armLenRatio

setNumArms()

void geos::geom::util::SineStarFactory::setNumArms ( int  nArms )

inline

Sets the number of arms in the star

Parameters

nArms

the number of arms to generate

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

• SineStarFactory.h