QGraphicsEllipseItem Class

The QGraphicsEllipseItem class provides an ellipse item that you can add to a QGraphicsScene. More...

Header:	#include <QGraphicsEllipseItem>
CMake:	find_package(Qt6 COMPONENTS Widgets REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake:	QT += widgets
Inherits:	QAbstractGraphicsShapeItem

• List of all members, including inherited members

Public Types

enum	anonymous { Type }

Public Functions

	QGraphicsEllipseItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = nullptr)
	QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent = nullptr)
	QGraphicsEllipseItem(QGraphicsItem *parent = nullptr)
virtual	~QGraphicsEllipseItem()
QRectF	rect() const
void	setRect(const QRectF &rect)
void	setRect(qreal x, qreal y, qreal width, qreal height)
void	setSpanAngle(int angle)
void	setStartAngle(int angle)
int	spanAngle() const
int	startAngle() const

Reimplemented Public Functions

virtual QRectF	boundingRect() const override
virtual bool	contains(const QPointF &point) const override
virtual bool	isObscuredBy(const QGraphicsItem *item) const override
virtual QPainterPath	opaqueArea() const override
virtual void	paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override
virtual QPainterPath	shape() const override
virtual int	type() const override

Detailed Description

QGraphicsEllipseItem respresents an ellipse with a fill and an outline, and you can also use it for ellipse segments (see startAngle(), spanAngle()).

To set the item's ellipse, pass a QRectF to QGraphicsEllipseItem's constructor, or call setRect(). The rect() function returns the current ellipse geometry.

QGraphicsEllipseItem uses the rect and the pen width to provide a reasonable implementation of boundingRect(), shape(), and contains(). The paint() function draws the ellipse using the item's associated pen and brush, which you can set by calling setPen() and setBrush().

See also QGraphicsPathItem, QGraphicsRectItem, QGraphicsPolygonItem, QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, and Graphics View Framework.

Member Type Documentation

enum QGraphicsEllipseItem::anonymous

The value returned by the virtual type() function.

Constant	Value	Description
QGraphicsEllipseItem::Type	4	A graphics ellipse item

Member Function Documentation

void QGraphicsEllipseItem::setRect(qreal x, qreal y, qreal width, qreal height)

Sets the item's rectangle to the rectangle defined by (x, y) and the given width and height.

This convenience function is equivalent to calling setRect(QRectF(x, y, width, height))

See also rect().

QGraphicsEllipseItem::QGraphicsEllipseItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = nullptr)

Constructs a QGraphicsEllipseItem using the rectangle defined by (x, y) and the given width and height, as the default rectangle. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

QGraphicsEllipseItem::QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent = nullptr)

Constructs a QGraphicsEllipseItem using rect as the default rectangle. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

QGraphicsEllipseItem::QGraphicsEllipseItem(QGraphicsItem *parent = nullptr)

Constructs a QGraphicsEllipseItem. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

[virtual] QGraphicsEllipseItem::~QGraphicsEllipseItem()

Destroys the QGraphicsEllipseItem.

[override virtual] QRectF QGraphicsEllipseItem::boundingRect() const

Reimplements: QGraphicsItem::boundingRect() const.

[override virtual] bool QGraphicsEllipseItem::contains(const QPointF &point) const

Reimplements: QGraphicsItem::contains(const QPointF &point) const.

[override virtual] bool QGraphicsEllipseItem::isObscuredBy(const QGraphicsItem *item) const

Reimplements: QAbstractGraphicsShapeItem::isObscuredBy(const QGraphicsItem *item) const.

[override virtual] QPainterPath QGraphicsEllipseItem::opaqueArea() const

Reimplements: QAbstractGraphicsShapeItem::opaqueArea() const.

[override virtual] void QGraphicsEllipseItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr)

Reimplements: QGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget).

QRectF QGraphicsEllipseItem::rect() const

Returns the item's ellipse geometry as a QRectF.

See also setRect() and QPainter::drawEllipse().

void QGraphicsEllipseItem::setRect(const QRectF &rect)

Sets the item's ellipse geometry to rect. The rectangle's left edge defines the left edge of the ellipse, and the rectangle's top edge describes the top of the ellipse. The height and width of the rectangle describe the height and width of the ellipse.

See also rect() and QPainter::drawEllipse().

void QGraphicsEllipseItem::setSpanAngle(int angle)

Sets the span angle for an ellipse segment to angle, which is in 16ths of a degree. This angle is used together with startAngle() to represent an ellipse segment (a pie). By default, the span angle is 5760 (360 * 16, a full ellipse).

See also spanAngle(), setStartAngle(), and QPainter::drawPie().

void QGraphicsEllipseItem::setStartAngle(int angle)

Sets the start angle for an ellipse segment to angle, which is in 16ths of a degree. This angle is used together with spanAngle() for representing an ellipse segment (a pie). By default, the start angle is 0.

See also startAngle(), setSpanAngle(), and QPainter::drawPie().

[override virtual] QPainterPath QGraphicsEllipseItem::shape() const

Reimplements: QGraphicsItem::shape() const.

int QGraphicsEllipseItem::spanAngle() const

Returns the span angle of an ellipse segment in 16ths of a degree. This angle is used together with startAngle() for representing an ellipse segment (a pie). By default, this function returns 5760 (360 * 16, a full ellipse).

See also setSpanAngle() and startAngle().

int QGraphicsEllipseItem::startAngle() const

Returns the start angle for an ellipse segment in 16ths of a degree. This angle is used together with spanAngle() for representing an ellipse segment (a pie). By default, the start angle is 0.

See also setStartAngle() and spanAngle().

[override virtual] int QGraphicsEllipseItem::type() const

Reimplements: QGraphicsItem::type() const.