Sector2 Class Reference

Intersection between a cone and a circle in the plane. More...

#include <sector.h>

Public Member Functions
	Sector2 ()
	Empty.
	Sector2 (const double &, const double &=Math::HalfPi)
	Creates a sector.
	Sector2 (const Vector2 &, const Vector2 &, const double &, const double &=Math::HalfPi)
	Creates a sector.
	~Sector2 ()
	Empty.
double	Signed (const Vector2 &) const
	Compute the signed Euclidean distance between a point and a sector.
void	Rotate (const Matrix2 &)
	Rotates a sector.
void	Translate (const Vector2 &)
	Translates a circle.
void	Scale (const double &)
	Uniformly scales a circle.
Box2	GetBox () const
	Compute the axis aligned bounding box.
OrientedBox2	GetOrientedBox () const
	Compute the oriented bounding box.
void	Draw (QGraphicsScene &, const QPen &, const QBrush &) const
	Draw the sector.

Protected Attributes
Vector2	c = Vector2::Null
	Center.
Vector2	sc = Vector2(Math::Sqrt2, Math::Sqrt2)
	Sine and cosine of the sector angle.
double	a = Math::Pi / 4.0
	Angle.
Vector2	axis = Vector::X
	Axis.
double	r = 1.0
	Radius.

Friends
std::ostream &	operator<< (std::ostream &s, const Sector2 &sector)
	Overloaded.

Detailed Description

Intersection between a cone and a circle in the plane.

Constructor & Destructor Documentation

Sector2() [1/2]

Sector2::Sector2 ( const double & r, const double & a = Math::HalfPi )

explicit

Creates a sector.

Parameters

r	Radius.
a	Angle.

Sector2() [2/2]

Sector2::Sector2 ( const Vector2 & c, const Vector2 & axis, const double & r, const double & a = Math::HalfPi )

explicit

Creates a sector.

Parameters

c	Center.
axis	Axis, which should be normalized.
r	Radius.
a	Angle.

Member Function Documentation

Draw()

void Sector2::Draw	(	QGraphicsScene &	scene,
		const QPen &	pen,
		const QBrush &	brush ) const

Draw the sector.

The arc is approximated by line segments, with an π/64 angle accuracy.

Parameters

scene	Graphics scene.
pen	The pen.
brush	The brush.

Rotate()

void Sector2::Rotate

(

const Matrix2 &

r

)

Rotates a sector.

Parameters

r	Rotation matrix.

Scale()

void Sector2::Scale

(

const double &

s

)

Uniformly scales a circle.

Parameters

s	Scaling factor.

Signed()

double Sector2::Signed

(

const Vector2 &

p

)

const

Compute the signed Euclidean distance between a point and a sector.

Parameters

p

Point.

Translate()

void Sector2::Translate

(

const Vector2 &

t

)

Translates a circle.

Parameters

t	Translation vector.

Friends And Related Symbol Documentation

operator<<

std::ostream & operator<< ( std::ostream & s, const Sector2 & sector )

friend

Overloaded.

Parameters

s	Stream.
sector	The sector.