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[править] QGraphicsEllipseItem Class Reference
^{[модуль QtGui ]}

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

 #include <QGraphicsEllipseItem>

Inherits QAbstractGraphicsShapeItem.

Класс был добавлен в Qt 4.2.

• Список всех членов, включая унаследованные

[править] Открытые функции

• QGraphicsEllipseItem ( QGraphicsItem * parent = 0 )
• QGraphicsEllipseItem ( const QRectF & rect, QGraphicsItem * parent = 0 )
• QGraphicsEllipseItem ( qreal x, qreal y, qreal width, qreal height, QGraphicsItem * parent = 0 )
• ~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

• 4 public functions inherited from QAbstractGraphicsShapeItem
• 114 public functions inherited from QGraphicsItem

[править] Дополнительные унаследованные члены

• 1 static public member inherited from QGraphicsItem
• 23 protected functions inherited from QGraphicsItem

[править] Подробное описание

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(). 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 The Graphics View Framework.

[править] Описание функций-членов

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QGraphicsEllipseItem::QGraphicsEllipseItem ( QGraphicsItem * parent = 0 )

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

See also QGraphicsScene::addItem().

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QGraphicsEllipseItem::QGraphicsEllipseItem ( const QRectF & rect, QGraphicsItem * parent = 0 )

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

See also QGraphicsScene::addItem().

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QGraphicsEllipseItem::QGraphicsEllipseItem ( qreal x, qreal y, qreal width, qreal height, QGraphicsItem * parent = 0 )

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.

Эта функция была введена в Qt 4.3.

See also QGraphicsScene::addItem().

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QGraphicsEllipseItem::~QGraphicsEllipseItem ()

Destroys the QGraphicsEllipseItem.

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QRectF QGraphicsEllipseItem::rect () const

Returns the item's ellipse geometry as a QRectF.

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

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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().

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

Эта перегруженная функция предоставлена для удобства.

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().

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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().

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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().

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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().

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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().