Polygons2 Class Reference

Set of disjoint polygons. More...

#include <polygon.h>

Public Member Functions
	Polygons2 ()
	Empty.
	Polygons2 (const QVector< Polygon2 > &)
	Create a set of polygons.
	Polygons2 (const QVector< Polygonal > &)
	Create a set of polygons by projecting polygons in space.
int	Size () const
	Return the size of the set.
	~Polygons2 ()
	Empty.
bool	Inside (const Vector2 &) const
	Test if a point is inside the union of a set of polygons.
double	R (const Vector2 &) const
	Compute the squared distance between a point and a set of polygons.
double	Signed (const Vector2 &) const
	Compute the signed distance between a point and a set of polygons.
double	Area () const
	Compute the area of the set of polygons.
double	Length () const
	Compute the perimeter of the set of polygons.
void	Resample (const double &)
	Resample the edges of the set of polygons.
const Polygon2 &	At (int) const
	Access.
void	Add (const Polygon2 &)
	Add a polygon to the set.
void	Draw (QGraphicsScene &, const QPen &=QPen(), const QBrush &=QBrush()) const
	Draw a polygon.

Protected Attributes
QVector< Polygon2 >	poly
	Set of polygons.

Detailed Description

Set of disjoint polygons.

Constructor & Destructor Documentation

Polygons2() [1/2]

Polygons2::Polygons2

(

const QVector< Polygon2 > &

p

)

Create a set of polygons.

Parameters

p	Set of polygons.

Polygons2() [2/2]

Polygons2::Polygons2

(

const QVector< Polygonal > &

p

)

Create a set of polygons by projecting polygons in space.

Parameters

p	Set of polygons.

Member Function Documentation

Add()

void Polygons2::Add

(

const Polygon2 &

p

)

Add a polygon to the set.

Parameters

p

Polygon.

Area()

double Polygons2::Area

(

)

const

Compute the area of the set of polygons.

The polygons should not intersect or overlap.

At()

const Polygon2 & Polygons2::At ( int i ) const

inline

Access.

Parameters

i

Index.

Draw()

void Polygons2::Draw	(	QGraphicsScene &	scene,
		const QPen &	pen = QPen(),
		const QBrush &	brush = QBrush() ) const

Draw a polygon.

Parameters

scene	Graphics scene.
pen	The pen.
brush	The brush, should the triangle be filled.

Inside()

bool Polygons2::Inside

(

const Vector2 &

p

)

const

Test if a point is inside the union of a set of polygons.

Polygons should be non intersecting. Polygons inside others will be considered as holes.

Parameters

p

Point.

R()

double Polygons2::R

(

const Vector2 &

p

)

const

Compute the squared distance between a point and a set of polygons.

Parameters

p

Point.

Resample()

void Polygons2::Resample

(

const double &

e

)

Resample the edges of the set of polygons.

See also

Polygons::Resampled(const double&)

Parameters

e

Distance.

Signed()

double Polygons2::Signed

(

const Vector2 &

p

)

const

Compute the signed distance between a point and a set of polygons.

Parameters

p

Point.