The QGraphicsEllipseItem class provides an ellipse item that you can add to a QGraphicsScene. More...
| Header: | #include <QGraphicsEllipseItem> |
| qmake: | QT += widgets |
| Since: | Qt 4.2 |
| Inherits: | QAbstractGraphicsShapeItem |
| enum | anonymous { Type } |
| 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 |
| 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 |
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 Graphics View Framework.
The value returned by the virtual type() function.
| Constant | Value | Description |
|---|---|---|
QGraphicsEllipseItem::Type |
4 |
A graphics ellipse item |
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().
Constructs a QGraphicsEllipseItem. parent is passed to QAbstractGraphicsShapeItem's constructor.
See also QGraphicsScene::addItem().
Constructs a QGraphicsEllipseItem using rect as the default rectangle. parent is passed to QAbstractGraphicsShapeItem's constructor.
See also QGraphicsScene::addItem().
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.
This function was introduced in Qt 4.3.
See also QGraphicsScene::addItem().
[virtual] QGraphicsEllipseItem::~QGraphicsEllipseItem()Destroys the QGraphicsEllipseItem.
[override virtual] QRectF QGraphicsEllipseItem::boundingRect() constReimplemented from QGraphicsItem::boundingRect().
[override virtual] bool QGraphicsEllipseItem::contains(const QPointF &point) constReimplemented from QGraphicsItem::contains().
[override virtual] bool QGraphicsEllipseItem::isObscuredBy(const QGraphicsItem *item) constReimplemented from QAbstractGraphicsShapeItem::isObscuredBy().
[override virtual] QPainterPath QGraphicsEllipseItem::opaqueArea() constReimplemented from QAbstractGraphicsShapeItem::opaqueArea().
[override virtual] void QGraphicsEllipseItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr)Reimplemented from QGraphicsItem::paint().
Returns the item's ellipse geometry as a QRectF.
See also setRect() and QPainter::drawEllipse().
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().
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().
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()
constReimplemented from QGraphicsItem::shape().
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().
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() constReimplemented from QGraphicsItem::type().
