IlvPointArray Class Reference

Geometric class. More...

#include <ilviews/base/ptarray.h>

Public Member Functions
	IlvPointArray ()
	Constructor. More...
	IlvPointArray (IlUInt count, const IlvPoint *points, IlBoolean copy=IlTrue)
	Constructor. More...
	IlvPointArray (const IlvPointArray &source)
	Copy constructor. More...
	~IlvPointArray ()
	Destructor. More...
void	addPoints (IlUInt count, const IlvPoint *points, IlUInt where)
	Appends a point array. More...
void	applyTransform (const IlvTransformer *t)
	Applies a transformer to the object. More...
IlInt	area (const IlvTransformer *t=0) const
	Computes the area of the point array. More...
const IlvRect &	bbox () const
	Retrieves the bounding box of the points. More...
void	boundingBox (IlvRect &box, const IlvTransformer *t=0) const
	Retrieves the transformed bounding box of the points. More...
void	movePoint (const IlvPoint &pos, IlUInt which)
	Moves a point. More...
IlUInt	nbHorizontalIntersect (const IlvPoint &p) const
	Counts horizontal crossings. More...
IlUInt	npoints () const
	Retrieves the size of the array. More...
IlBoolean	outlineContains (const IlvPoint &p) const
	Hit test. More...
const IlvPoint *	points () const
	Retrieves the IlvPoint array. More...
const IlvPoint *	points (IlUInt index) const
	Retrieves a pointer in the IlvPoint array. More...
IlBoolean	removePoints (IlUInt start, IlUInt count)
	Removes a block of points. More...
void	setPoints (IlUInt count, const IlvPoint *points, IlBoolean copy=IlTrue)
	Sets the point array. More...

Detailed Description

Geometric class.

Library: display

IlvPointArray is a class that encapsulates an array of IlvPoints so that you can more easily manipulate these arrays.

Constructor & Destructor Documentation

IlvPointArray::IlvPointArray

(

)

Constructor.

Initializes a new, empty instance of IlvPointArray.

IlvPointArray::IlvPointArray	(	IlUInt	count,
		const IlvPoint *	points,
		IlBoolean	copy = IlTrue
	)

Constructor.

Parameters

count	The number of initial points of this array.
points	The array of at least count points that defines the shape of this new instance.
copy	If set to IlTrue, this constructor makes a copy of points and the user is responsible of freeing points if necessary. If copy is IlFalse, the IlvPointArray stores directly the parameter points and the user must not modify it anymore.

IlvPointArray::IlvPointArray

(

const IlvPointArray &

source

)

Copy constructor.

Initializes a new IlvPointArray as a copy of source.

Parameters

source

The instance that is copied.

IlvPointArray::~IlvPointArray

(

)

Destructor.

The destructor deletes the internal point array. The IlvPointArray must always be considered as the owner of the array of the IlvPoint it stores. This array is deleted when the object is destroyed.

Member Function Documentation

void IlvPointArray::addPoints	(	IlUInt	count,
		const IlvPoint *	points,
		IlUInt	where
	)

Appends a point array.

Parameters

count	The number of points to be appended.
points	The array of at least count IlvPoints that are appended. This array is copied, so the user is responsible for deleting points if necessary.
where	The insertion index. where becomes the index of the first point of points in the new array.

void IlvPointArray::applyTransform

(

const IlvTransformer *

t

)

Applies a transformer to the object.

The transformer t is applied to each point in the array.

Parameters

t	The transformer to be applied.

IlInt IlvPointArray::area

(

const IlvTransformer *

t = 0

)

const

Computes the area of the point array.

Parameters

t	The transformer that must be applied before the area is computed.

Returns

The area of the polygon formed by the sequence of IlvPoints of the object. This area is positive if the polygon turns clockwise.

const IlvRect& IlvPointArray::bbox

(

)

const

Retrieves the bounding box of the points.

Returns

The bounding box of all IlvPoints in the array.

void IlvPointArray::boundingBox	(	IlvRect &	box,
		const IlvTransformer *	t = 0
	)		const

Retrieves the transformed bounding box of the points.

Parameters

box	The output transformed bounding box. It is the IlvRect obtained by applying the transformer t to the bounding box of the IlvPointArray. box strictly includes the bounding box of the point array if the transformer t is applied to each point.
t	The transformed to be applied. If this parameter is not provided, or set to 0, the points are not transformed when the bounding box is computed.

void IlvPointArray::movePoint	(	const IlvPoint &	pos,
		IlUInt	which
	)

Moves a point.

Parameters

pos	The new location of the point.
which	The index of the point to move.

IlUInt IlvPointArray::nbHorizontalIntersect

(

const IlvPoint &

p

)

const

Counts horizontal crossings.

Parameters

p	The source point of the horizontal ray.

Returns

The number of times an infinite horizontal ray intersects the polyline formed by the sequence of IlvPoints of the object. The ray starts at p and goes towards positive x.

IlUInt IlvPointArray::npoints

(

)

const

Retrieves the size of the array.

Returns

The number of IlvPoints in the internal array.

IlBoolean IlvPointArray::outlineContains

(

const IlvPoint &

p

)

const

Hit test.

Parameters

p	The point whose location is tested.

Returns

IlTrue if p lies on a segment of the polyline formed by the sequence of IlvPoints of the object.

const IlvPoint* IlvPointArray::points

(

)

const

Retrieves the IlvPoint array.

Returns

The internal array of IlvPoints. This array must not be modified nor freed.

const IlvPoint* IlvPointArray::points

(

IlUInt

index

)

const

Retrieves a pointer in the IlvPoint array.

Returns

The address of the IlvPoint at index index. Equivalent to &(points()[index]).

IlBoolean IlvPointArray::removePoints	(	IlUInt	start,
		IlUInt	count
	)

Removes a block of points.

Parameters

start	The index of the first point to be removed.
count	The number of consecutive points to be removed.

Returns

IlTrue if the operation is successful, and IlFalse if the operation cannot be performed (not enough points in the array).

void IlvPointArray::setPoints	(	IlUInt	count,
		const IlvPoint *	points,
		IlBoolean	copy = IlTrue
	)

Sets the point array.

Parameters

count	The number of points that are set.
points	The source array of points. It must store at least count IlvPoints.
copy	Indicates, if set to IlTrue, that the array is copied before it is stored in this object. If copy is IlFalse, the IlvPointArray stores directly the parameter points and the user must no longer modify it.