Disk Struct Reference

A disk is a simple graphical shape. More...

#include <objects.hpp>

Inheritance diagram for Disk:

Public Member Functions
	Disk (qreal r, const MasterShape *master_shape)
virtual void	paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override
virtual QPointF	randomPoint () const override
virtual bool	isInside (const QPointF &p) const override
virtual QRectF	boundingRect () const override

Public Attributes
const qreal	_r
const MasterShape *	_master_shape

Detailed Description

A disk is a simple graphical shape.

It points to its master shape in order to know in which color it must be painted.

Definition at line 74 of file objects.hpp.

Constructor & Destructor Documentation

Disk()

Disk::Disk	(	qreal	r,
		const MasterShape *	master_shape
	)

Definition at line 30 of file objects.cpp.

  : _r( r ), _master_shape( master_shape ) {}

Member Function Documentation

boundingRect()

QRectF Disk::boundingRect ( ) const

overridevirtual

Definition at line 51 of file objects.cpp.

{
  return QRectF( -_r, -_r, 2.0 *_r, 2.0 * _r );
}

isInside()

bool Disk::isInside ( const QPointF &  p ) const

overridevirtual

Implements GraphicalShape.

Definition at line 45 of file objects.cpp.

{
  return QPointF::dotProduct( p, p ) <= _r * _r;
}

paint()

void Disk::paint ( QPainter *  painter, const QStyleOptionGraphicsItem *  option, QWidget *  widget  )

overridevirtual

Definition at line 57 of file objects.cpp.

{
  painter->setBrush( _master_shape->currentColor() );
  painter->drawEllipse( QPointF( 0.0, 0.0 ), _r, _r );
}

randomPoint()

QPointF Disk::randomPoint ( ) const

overridevirtual

Implements GraphicalShape.

Definition at line 34 of file objects.cpp.

{
  QPointF p;
  do {
    p = QPointF( ( rand01() * 2.0 - 1.0 ),
                 ( rand01() * 2.0 - 1.0 ) );
  } while ( ( p.x() * p.x() + p.y() * p.y() ) > 1.0 );
  return p * _r;
}

Member Data Documentation

_master_shape

const MasterShape* Disk::_master_shape

Definition at line 83 of file objects.hpp.

_r

const qreal Disk::_r

Definition at line 82 of file objects.hpp.

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The documentation for this struct was generated from the following files:

• TP0/objects.hpp
• TP0/objects.cpp