TwinDisc2 Class Reference

Twin discs in the plane with uniform radius. More...

#include <lens.h>

Public Member Functions
	TwinDisc2 (const Vector2 &, const Vector2 &, const double &)
	Create a twin disc.
bool	Inside (const Vector2 &) const
	Test if a point is inside the lens.
double	R (const Vector2 &) const
	Compute the Euclidean distance to the lens.
double	Signed (const Vector2 &) const
	Compute the Euclidean distance to the lens.
double	Area () const
	Compute the area.
Box2	GetBox () const
	Compute the bounding box.
void	Draw (QGraphicsScene &, const QPen &=QPen(), const QBrush &=QBrush()) const
	Draw the union of two discs.

Protected Attributes
Vector2	b
	Centers.
double	r
	Radius.

Friends
std::ostream &	operator<< (std::ostream &s, const TwinDisc2 &d)
	Overloaded.

Detailed Description

Twin discs in the plane with uniform radius.

Constructor & Destructor Documentation

TwinDisc2()

TwinDisc2::TwinDisc2	(	const Vector2 &	a,
		const Vector2 &	b,
		const double &	r )

Create a twin disc.

Parameters

a,b	Centers of the discs.
r	Radius.

Member Function Documentation

Area()

double TwinDisc2::Area

(

)

const

Compute the area.

Area is defined as the sum of the areas of the discs, minus the area of their lens-shaped intersecting region.

See also

Lens2::Area() const

Draw()

void TwinDisc2::Draw	(	QGraphicsScene &	scene,
		const QPen &	pen = QPen(),
		const QBrush &	brush = QBrush() ) const

Draw the union of two discs.

Parameters

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

Inside()

bool TwinDisc2::Inside

(

const Vector2 &

p

)

const

Test if a point is inside the lens.

Parameters

p

Point.

R()

double TwinDisc2::R

(

const Vector2 &

p

)

const

Compute the Euclidean distance to the lens.

Parameters

p

Point.

Signed()

double TwinDisc2::Signed

(

const Vector2 &

p

)

const

Compute the Euclidean distance to the lens.

Parameters

p

Point.

Friends And Related Symbol Documentation

operator<<

std::ostream & operator<< ( std::ostream & s, const TwinDisc2 & d )

friend

Overloaded.

Parameters

s	Stream.
d	Discs.