The QPolygonF class provides a list of points using floating point precision. More...

#include <qpolygon.h>

Inheritance diagram for QPolygonF:

Collaboration diagram for QPolygonF:

Public Member Functions
	QPolygonF ()=default
	Constructs a polygon with no points.

Q_IMPLICIT	QPolygonF (const QList< QPointF > &v)
	Constructs a polygon containing the specified points.

Q_IMPLICIT	QPolygonF (QList< QPointF > &&v) noexcept

Q_IMPLICIT Q_GUI_EXPORT	QPolygonF (const QRectF &r)
	Constructs a closed polygon from the specified rectangle.

Q_IMPLICIT Q_GUI_EXPORT	QPolygonF (const QPolygon &a)
	Constructs a float based polygon from the specified integer based polygon.

void	swap (QPolygonF &other)

Q_GUI_EXPORT	operator QVariant () const
	Returns the polygon as a QVariant.

void	translate (qreal dx, qreal dy)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Translates all points in the polygon by ({dx}, {dy}).

void Q_GUI_EXPORT	translate (const QPointF &offset)
	Translate all points in the polygon by the given offset.

QPolygonF	translated (qreal dx, qreal dy) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Q_GUI_EXPORT QPolygonF	translated (const QPointF &offset) const
	Returns a copy of the polygon that is translated by the given offset.

QPolygon Q_GUI_EXPORT	toPolygon () const
	Creates and returns a QPolygon by converting each QPointF to a QPoint.

bool	isClosed () const
	Returns `true` if the polygon is closed; otherwise returns `false`.

QRectF Q_GUI_EXPORT	boundingRect () const
	Returns the bounding rectangle of the polygon, or QRectF(0,0,0,0) if the polygon is empty.

Q_GUI_EXPORT bool	containsPoint (const QPointF &pt, Qt::FillRule fillRule) const

Q_GUI_EXPORT QPolygonF	united (const QPolygonF &r) const

Q_GUI_EXPORT QPolygonF	intersected (const QPolygonF &r) const

Q_GUI_EXPORT QPolygonF	subtracted (const QPolygonF &r) const

Q_GUI_EXPORT bool	intersects (const QPolygonF &r) const

Public Member Functions inherited from QList< QPointF >
	QList (DataPointer dd) noexcept

	QList ()=default

	QList (qsizetype size)

	QList (qsizetype size, parameter_type t)

	QList (std::initializer_list< QPointF > args)

	QList (InputIterator i1, InputIterator i2)

	QList (const String &str)

QList< QPointF > &	operator= (std::initializer_list< QPointF > args)

void	swap (QList &other) noexcept

QTypeTraits::compare_eq_result_container< QList, U >	operator== (const QList &other) const

QTypeTraits::compare_eq_result_container< QList, U >	operator!= (const QList &other) const

QTypeTraits::compare_lt_result_container< QList, U >	operator< (const QList &other) const noexcept(noexcept(std::lexicographical_compare< typename QList< U >::const_iterator, typename QList::const_iterator >(std::declval< QList< U > >().begin(), std::declval< QList< U > >().end(), other.begin(), other.end())))

QTypeTraits::compare_lt_result_container< QList, U >	operator> (const QList &other) const noexcept(noexcept(other< std::declval< QList< U > >()))

QTypeTraits::compare_lt_result_container< QList, U >	operator<= (const QList &other) const noexcept(noexcept(other< std::declval< QList< U > >()))

QTypeTraits::compare_lt_result_container< QList, U >	operator>= (const QList &other) const noexcept(noexcept(std::declval< QList< U > >()< other))

qsizetype	size () const noexcept

qsizetype	count () const noexcept

qsizetype	count (const AT &t) const noexcept

qsizetype	length () const noexcept

bool	isEmpty () const noexcept

void	resize (qsizetype size)

void	resize (qsizetype size, parameter_type c)

qsizetype	capacity () const

void	reserve (qsizetype size)

void	squeeze ()

void	detach ()

bool	isDetached () const noexcept

bool	isSharedWith (const QList< QPointF > &other) const

pointer	data ()

const_pointer	data () const noexcept

const_pointer	constData () const noexcept

void	clear ()

const_reference	at (qsizetype i) const noexcept

reference	operator[] (qsizetype i)

const_reference	operator[] (qsizetype i) const noexcept

void	append (parameter_type t)

void	append (const_iterator i1, const_iterator i2)

void	append (rvalue_ref t)

void	append (const QList< QPointF > &l)

void	append (QList< QPointF > &&l)

void	prepend (rvalue_ref t)

void	prepend (parameter_type t)

reference	emplaceBack (Args &&... args)

reference	emplaceFront (Args &&... args)

iterator	insert (qsizetype i, parameter_type t)

iterator	insert (qsizetype i, qsizetype n, parameter_type t)

iterator	insert (const_iterator before, parameter_type t)

iterator	insert (const_iterator before, qsizetype n, parameter_type t)

iterator	insert (const_iterator before, rvalue_ref t)

iterator	insert (qsizetype i, rvalue_ref t)

QList &	assign (qsizetype n, parameter_type t)

QList &	assign (InputIterator first, InputIterator last)

QList &	assign (std::initializer_list< QPointF > l)

iterator	emplace (const_iterator before, Args &&... args)

iterator	emplace (qsizetype i, Args &&... args)

void	replace (qsizetype i, parameter_type t)

void	replace (qsizetype i, rvalue_ref t)

void	remove (qsizetype i, qsizetype n=1)

void	removeFirst () noexcept

void	removeLast () noexcept

value_type	takeFirst ()

value_type	takeLast ()

QList< QPointF > &	fill (parameter_type t, qsizetype size=-1)

void	removeAt (qsizetype i)

qsizetype	removeAll (const AT &t)

bool	removeOne (const AT &t)

qsizetype	removeIf (Predicate pred)

QPointF	takeAt (qsizetype i)

void	move (qsizetype from, qsizetype to)

iterator	begin ()

const_iterator	begin () const noexcept

iterator	end ()

const_iterator	end () const noexcept

const_iterator	cbegin () const noexcept

const_iterator	cend () const noexcept

const_iterator	constBegin () const noexcept

const_iterator	constEnd () const noexcept

reverse_iterator	rbegin ()

const_reverse_iterator	rbegin () const noexcept

reverse_iterator	rend ()

const_reverse_iterator	rend () const noexcept

const_reverse_iterator	crbegin () const noexcept

const_reverse_iterator	crend () const noexcept

iterator	erase (const_iterator begin, const_iterator end)

iterator	erase (const_iterator pos)

QPointF &	first ()

const QPointF &	first () const noexcept

QList< QPointF >	first (qsizetype n) const

const QPointF &	constFirst () const noexcept

QPointF &	last ()

const QPointF &	last () const noexcept

QList< QPointF >	last (qsizetype n) const

const QPointF &	constLast () const noexcept

bool	startsWith (parameter_type t) const

bool	endsWith (parameter_type t) const

QList< QPointF >	mid (qsizetype pos, qsizetype len=-1) const

QList< QPointF >	sliced (qsizetype pos) const

QList< QPointF >	sliced (qsizetype pos, qsizetype n) const

QPointF	value (qsizetype i) const

QPointF	value (qsizetype i, parameter_type defaultValue) const

void	swapItemsAt (qsizetype i, qsizetype j)

void	push_back (parameter_type t)

void	push_back (rvalue_ref t)

void	push_front (rvalue_ref t)

void	push_front (parameter_type t)

void	pop_back () noexcept

void	pop_front () noexcept

reference	emplace_back (Args &&... args)

bool	empty () const noexcept

reference	front ()

const_reference	front () const noexcept

reference	back ()

const_reference	back () const noexcept

void	shrink_to_fit ()

QList< QPointF > &	operator+= (const QList< QPointF > &l)

QList< QPointF > &	operator+= (QList< QPointF > &&l)

QList< QPointF > &	operator+= (parameter_type t)

QList< QPointF > &	operator+= (rvalue_ref t)

QList< QPointF >	operator+ (const QList< QPointF > &l) const &

QList< QPointF >	operator+ (const QList< QPointF > &l) &&

QList< QPointF >	operator+ (QList< QPointF > &&l) const &

QList< QPointF >	operator+ (QList< QPointF > &&l) &&

QList< QPointF > &	operator<< (parameter_type t)

QList< QPointF > &	operator<< (const QList< QPointF > &l)

QList< QPointF > &	operator<< (QList< QPointF > &&l)

QList< QPointF > &	operator<< (rvalue_ref t)

QList< QPointF >	toList () const noexcept

QList< QPointF >	toVector () const noexcept

Public Member Functions inherited from QListSpecialMethodsBase< T >
template<typename AT = T>
qsizetype	indexOf (const AT &t, qsizetype from=0) const noexcept

template<typename AT = T>
qsizetype	lastIndexOf (const AT &t, qsizetype from=-1) const noexcept

template<typename AT = T>
bool	contains (const AT &t) const noexcept

Related Symbols
(Note that these are not member symbols.)
QDataStream &	operator<< (QDataStream &stream, const QPolygonF &polygon)
	Writes the given polygon to the given stream, and returns a reference to the stream.

QDataStream &	operator>> (QDataStream &stream, QPolygonF &polygon)
	Reads a polygon from the given stream into the given polygon, and returns a reference to the stream.

Additional Inherited Members
Public Types inherited from QList< QPointF >
using	Type = QPointF

using	value_type = QPointF

using	pointer = QPointF *

using	const_pointer = const QPointF *

using	reference = QPointF &

using	const_reference = const QPointF &

using	size_type = qsizetype

using	difference_type = qptrdiff

using	parameter_type = typename DataPointer::parameter_type

using	rvalue_ref = typename std::conditional< DataPointer::pass_parameter_by_value, DisableRValueRefs, QPointF && >::type

using	Iterator = iterator

using	ConstIterator = const_iterator

using	reverse_iterator = std::reverse_iterator< iterator >

using	const_reverse_iterator = std::reverse_iterator< const_iterator >

Static Public Member Functions inherited from QList< QPointF >
static QList< QPointF >	fromList (const QList< QPointF > &list) noexcept

static QList< QPointF >	fromVector (const QList< QPointF > &vector) noexcept

static QList< QPointF >	fromReadOnlyData (const QPointF(&t)[N]) noexcept

Protected Types inherited from QListSpecialMethodsBase< T >
using	Self = QList< T >

Protected Member Functions inherited from QListSpecialMethods< T >
	~QListSpecialMethods ()=default

Protected Member Functions inherited from QListSpecialMethodsBase< T >
	~QListSpecialMethodsBase ()=default

Self *	self ()

const Self *	self () const

Detailed Description

The QPolygonF class provides a list of points using floating point precision.

\inmodule QtGui

\reentrant

A QPolygonF is a QList<QPointF>. The easiest way to add points to a QPolygonF is to use its streaming operator, as illustrated below:

QPolygonF polygon;

polygon << QPointF(10.4, 20.5) << QPointF(20.2, 30.2);

QPointF

\inmodule QtCore\reentrant

Definition qpoint.h:214

QPolygonF

The QPolygonF class provides a list of points using floating point precision.

Definition qpolygon.h:96

polygon

Definition polygon.cpp:4

In addition to the functions provided by QList, QPolygonF provides the boundingRect() and translate() functions for geometry operations. Use the QTransform::map() function for more general transformations of QPolygonFs.

QPolygonF also provides the isClosed() function to determine whether a polygon's start and end points are the same, and the toPolygon() function returning an integer precision copy of this polygon.

The QPolygonF class is \l {Implicit Data Sharing}{implicitly shared}.

See also: QList, QPolygon, QLineF

Definition at line 95 of file qpolygon.h.

Constructor & Destructor Documentation

◆ QPolygonF() [1/5]

QPolygonF::QPolygonF ( )

default

Constructs a polygon with no points.

See also: QList::isEmpty()

◆ QPolygonF() [2/5]

QPolygonF::QPolygonF ( const QList< QPointF > & v )

inline

Constructs a polygon containing the specified points.

Definition at line 100 of file qpolygon.h.

◆ QPolygonF() [3/5]

Q_IMPLICIT QPolygonF::QPolygonF ( QList< QPointF > && v )

inlinenoexcept

Definition at line 101 of file qpolygon.h.

◆ QPolygonF() [4/5]

QPolygonF::QPolygonF ( const QRectF & rectangle )

Constructs a closed polygon from the specified rectangle.

The polygon contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex.

See also: isClosed()

Definition at line 494 of file qpolygon.cpp.

References QList< QPointF >::append(), and QList< QPointF >::reserve().

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◆ QPolygonF() [5/5]

QPolygonF::QPolygonF ( const QPolygon & polygon )

Constructs a float based polygon from the specified integer based polygon.

See also: toPolygon()

Definition at line 513 of file qpolygon.cpp.

References QList< QPointF >::append(), i, and QList< QPointF >::reserve().

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Member Function Documentation

◆ boundingRect()

QRectF QPolygonF::boundingRect ( ) const

Returns the bounding rectangle of the polygon, or QRectF(0,0,0,0) if the polygon is empty.

See also: QList::isEmpty()

Definition at line 588 of file qpolygon.cpp.

References QList< QPointF >::constData(), QList< QPointF >::size(), QPointF::x(), and QPointF::y().

Referenced by QSvgPolygon::fastBounds(), QSvgPolyline::fastBounds(), QGraphicsViewPrivate::mapToScene(), QGraphicsView::render(), and QQuickPdfSelection::selectAll().

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◆ containsPoint()

bool QPolygonF::containsPoint	(	const QPointF &	point,
		Qt::FillRule	fillRule
	)		const

Since: 4.3

Returns true if the given point is inside the polygon according to the specified fillRule; otherwise returns false.

Definition at line 761 of file qpolygon.cpp.

References at, e, i, QList< QPointF >::isEmpty(), qt_polygon_isect_line(), QList< QPointF >::size(), and Qt::WindingFill.

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◆ intersected()

QPolygonF QPolygonF::intersected ( const QPolygonF & r ) const

Since: 4.3

Returns a polygon which is the intersection of this polygon and r.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

See also: intersects()

Definition at line 922 of file qpolygon.cpp.

References QPainterPath::addPolygon(), QPainterPath::intersected(), and QPainterPath::toFillPolygon().

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◆ intersects()

bool QPolygonF::intersects ( const QPolygonF & p ) const

Since: 5.10

Returns true if the current polygon intersects at any point the given polygon p. Also returns true if the current polygon contains or is contained by any part of p.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

See also: intersected()

Definition at line 959 of file qpolygon.cpp.

References QPainterPath::addPolygon(), and QPainterPath::intersects().

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◆ isClosed()

bool QPolygonF::isClosed ( ) const

inline

Returns true if the polygon is closed; otherwise returns false.

A polygon is said to be closed if its start point and end point are equal.

See also: QList::first(), QList::last()

Definition at line 116 of file qpolygon.h.

References QList< QPointF >::first(), QList< QPointF >::isEmpty(), and QList< QPointF >::last().

Referenced by QPainterPath::toFillPolygons().

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◆ operator QVariant()

QPolygonF::operator QVariant ( ) const

Returns the polygon as a QVariant.

Definition at line 971 of file qpolygon.cpp.

References QVariant::fromValue().

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◆ subtracted()

QPolygonF QPolygonF::subtracted ( const QPolygonF & r ) const

Since: 4.3

Returns a polygon which is r subtracted from this polygon.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

Definition at line 940 of file qpolygon.cpp.

References QPainterPath::addPolygon(), QPainterPath::subtracted(), and QPainterPath::toFillPolygon().

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◆ swap()

void QPolygonF::swap ( QPolygonF & other )

inline

Since: 4.8

Swaps polygon other with this polygon. This operation is very fast and never fails.

Definition at line 104 of file qpolygon.h.

References other(), and QList< T >::swap().

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◆ toPolygon()

QPolygon QPolygonF::toPolygon ( ) const

Creates and returns a QPolygon by converting each QPointF to a QPoint.

See also: QPointF::toPoint()

Definition at line 619 of file qpolygon.cpp.

References at, i, and QList< QPointF >::size().

Referenced by QPolygon::intersected(), QTransform::map(), QPolygon::subtracted(), QX11PaintEnginePrivate::systemStateChanged(), QPolygon::united(), and QX11PaintEngine::updateState().

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◆ translate() [1/2]

void QPolygonF::translate ( const QPointF & offset )

Translate all points in the polygon by the given offset.

See also: translated()

Definition at line 526 of file qpolygon.cpp.

References QList< QPointF >::data(), i, and QList< QPointF >::size().

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◆ translate() [2/2]

void QPolygonF::translate	(	qreal	dx,
		qreal	dy
	)

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Translates all points in the polygon by ({dx}, {dy}).

See also: translated()

Definition at line 144 of file qpolygon.h.

References translate().

Referenced by translate().

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◆ translated() [1/2]

QPolygonF QPolygonF::translated ( const QPointF & offset ) const

Returns a copy of the polygon that is translated by the given offset.

Since: 4.6

See also: translate()

Definition at line 554 of file qpolygon.cpp.

References copy().

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◆ translated() [2/2]

QPolygonF QPolygonF::translated	(	qreal	dx,
		qreal	dy
	)		const

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Since: 4.6

Returns a copy of the polygon that is translated by ({dx}, {dy}).

See also: translate()

Definition at line 147 of file qpolygon.h.

References translated().

Referenced by translated().

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◆ united()

QPolygonF QPolygonF::united ( const QPolygonF & r ) const

Since: 4.3

Returns a polygon which is the union of this polygon and r.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.

See also: intersected(), subtracted()

Definition at line 903 of file qpolygon.cpp.

References QPainterPath::addPolygon(), QPainterPath::toFillPolygon(), and QPainterPath::united().

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Friends And Related Symbol Documentation

◆ operator<<()

QDataStream & operator<<	(	QDataStream &	stream,
		const QPolygonF &	polygon
	)

See also: {Serializing Qt Data Types}

Definition at line 703 of file qpolygon.cpp.

References i.

◆ operator>>()

QDataStream & operator>>	(	QDataStream &	stream,
		QPolygonF &	polygon
	)

See also: {Serializing Qt Data Types}

Definition at line 724 of file qpolygon.cpp.

References i.

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

qtbase/src/gui/painting/qpolygon.h
qtbase/src/gui/painting/qpolygon.cpp

Public Member Functions

Related Symbols

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QPolygonF() [1/5]

◆ QPolygonF() [2/5]

◆ QPolygonF() [3/5]

◆ QPolygonF() [4/5]

◆ QPolygonF() [5/5]

Member Function Documentation

◆ boundingRect()

◆ containsPoint()

◆ intersected()

◆ intersects()

◆ isClosed()

◆ operator QVariant()

◆ subtracted()

◆ swap()

◆ toPolygon()

◆ translate() [1/2]

◆ translate() [2/2]

◆ translated() [1/2]

◆ translated() [2/2]

◆ united()

Friends And Related Symbol Documentation

◆ operator<<()

◆ operator>>()