內容

• 公共類型
• 公共函數
• 重實現公共函數
• 詳細描述

QGraphicsEllipseItem 類

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

頭：	#include <QGraphicsEllipseItem>
qmake:	QT += widgets
Since:	Qt 4.2
繼承：	QAbstractGraphicsShapeItem

• 所有成員列錶，包括繼承成員
• 過時成員

公共類型

enum	anonymous { Type }

公共函數

	QGraphicsEllipseItem (QGraphicsItem * parent = nullptr)
	QGraphicsEllipseItem (const QRectF & rect , QGraphicsItem * parent = nullptr)
	QGraphicsEllipseItem (qreal x , qreal y , qreal width , qreal height , 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

重實現公共函數

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

• 6 公共函數繼承自 QAbstractGraphicsShapeItem
• 176 公共函數繼承自 QGraphicsItem

額外繼承成員

• 24 保護函數繼承自 QGraphicsItem

詳細描述

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

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 ()。 rect () function returns the current ellipse geometry.

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

另請參閱 QGraphicsPathItem , QGraphicsRectItem , QGraphicsPolygonItem , QGraphicsTextItem , QGraphicsLineItem , QGraphicsPixmapItem ，和 圖形視圖框架 .

成員類型文檔編製

enum QGraphicsEllipseItem:: anonymous

值的返迴是通過虛擬 type () 函數。

常量	值	描述
QGraphicsEllipseItem::Type	4	圖形橢圓項

成員函數文檔編製

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

將項的矩形設為矩形，定義通過 ( x , y ) 和給定 width and height .

此方便函數相當於調用 setRect(QRectF(x, y, width, height))

另請參閱 rect ().

QGraphicsEllipseItem:: QGraphicsEllipseItem ( QGraphicsItem * parent = nullptr)

構造 QGraphicsEllipseItem . parent 被傳遞給 QAbstractGraphicsShapeItem 的構造函數。

另請參閱 QGraphicsScene::addItem ().

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

構造 QGraphicsEllipseItem 使用 rect 作為默認矩形。 parent 被傳遞給 QAbstractGraphicsShapeItem 的構造函數。

另請參閱 QGraphicsScene::addItem ().

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

構造 QGraphicsEllipseItem using the rectangle defined by ( x , y ) 和給定 width and height , as the default rectangle. parent 被傳遞給 QAbstractGraphicsShapeItem 的構造函數。

該函數在 Qt 4.3 引入。

另請參閱 QGraphicsScene::addItem ().

[虛擬] QGraphicsEllipseItem:: ~QGraphicsEllipseItem ()

銷毀 QGraphicsEllipseItem .

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

重實現自 QGraphicsItem::boundingRect ().

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

重實現自 QGraphicsItem::contains ().

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

重實現自 QAbstractGraphicsShapeItem::isObscuredBy ().

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

重實現自 QAbstractGraphicsShapeItem::opaqueArea ().

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

重實現自 QGraphicsItem::paint ().

QRectF QGraphicsEllipseItem:: rect () const

Returns the item's ellipse geometry as a QRectF .

另請參閱 setRect () 和 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.

另請參閱 rect () 和 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).

另請參閱 spanAngle (), setStartAngle ()，和 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.

另請參閱 startAngle (), setSpanAngle ()，和 QPainter::drawPie ().

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

重實現自 QGraphicsItem::shape ().

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).

另請參閱 setSpanAngle () 和 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.

另請參閱 setStartAngle () 和 spanAngle ().

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

重實現自 QGraphicsItem::type ().