QGraphicsEllipseItem Class
The QGraphicsEllipseItem class provides an ellipse item that you can add to a QGraphicsScene. 更多...
| 头文件: | #include <QGraphicsEllipseItem> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QAbstractGraphicsShapeItem |
公有函数
| QGraphicsEllipseItem(QGraphicsItem *parent = Q_NULLPTR) | |
| QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent = Q_NULLPTR) | |
| QGraphicsEllipseItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = Q_NULLPTR) | |
| ~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 |
重新实现的公有函数
| virtual QRectF | boundingRect() const |
| virtual bool | contains(const QPointF &point) const |
| virtual bool | isObscuredBy(const QGraphicsItem *item) const |
| virtual QPainterPath | opaqueArea() const |
| virtual void | paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = Q_NULLPTR) |
| virtual QPainterPath | shape() const |
| virtual int | type() const |
- 6 个公有函数继承自 QAbstractGraphicsShapeItem
- 176 个公有函数继承自 QGraphicsItem
其他继承的成员
- 2 个静态公有成员继承自 QGraphicsItem
- 24 个受保护的函数继承自 QGraphicsItem
详细描述
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()).
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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().
参见 QGraphicsPathItem, QGraphicsRectItem, QGraphicsPolygonItem, QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, and Graphics View Framework.
成员函数
QGraphicsEllipseItem::QGraphicsEllipseItem(QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsEllipseItem. parent is passed to QAbstractGraphicsShapeItem's constructor.
参见 QGraphicsScene::addItem().
QGraphicsEllipseItem::QGraphicsEllipseItem(const QRectF &rect, QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsEllipseItem using rect as the default rectangle. parent is passed to QAbstractGraphicsShapeItem's constructor.
参见 QGraphicsScene::addItem().
QGraphicsEllipseItem::QGraphicsEllipseItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = Q_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.
This function was introduced in Qt 4.3.
参见 QGraphicsScene::addItem().
QGraphicsEllipseItem::~QGraphicsEllipseItem()
Destroys the QGraphicsEllipseItem.
[virtual] QRectF QGraphicsEllipseItem::boundingRect() const
重新实现 QGraphicsItem::boundingRect().
[virtual] bool QGraphicsEllipseItem::contains(const QPointF &point) const
重新实现 QGraphicsItem::contains().
[virtual] bool QGraphicsEllipseItem::isObscuredBy(const QGraphicsItem *item) const
重新实现 QGraphicsItem::isObscuredBy().
[virtual] QPainterPath QGraphicsEllipseItem::opaqueArea() const
重新实现 QGraphicsItem::opaqueArea().
[virtual] void QGraphicsEllipseItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = Q_NULLPTR)
重新实现 QGraphicsItem::paint().
QRectF QGraphicsEllipseItem::rect() const
Returns the item's ellipse geometry as a QRectF.
参见 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.
参见 rect() and QPainter::drawEllipse().
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))
参见 rect().
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).
参见 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.
参见 startAngle(), setSpanAngle(), and QPainter::drawPie().
[virtual] QPainterPath QGraphicsEllipseItem::shape() const
重新实现 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).
参见 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.
参见 setStartAngle() and spanAngle().
[virtual] int QGraphicsEllipseItem::type() const
重新实现 QGraphicsItem::type().