QGraphicsEllipseItem 类提供的椭圆项可以被添加到 QGraphicsScene . 更多...
头: | #include <QGraphicsEllipseItem> |
CMake: |
find_package(Qt6 COMPONENTS Widgets REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Widgets) |
qmake: | QT += widgets |
继承: | QAbstractGraphicsShapeItem |
enum | anonymous { Type } |
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 |
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 |
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 ()。 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 ().
另请参阅 QGraphicsPathItem , QGraphicsRectItem , QGraphicsPolygonItem , QGraphicsTextItem , QGraphicsLineItem , QGraphicsPixmapItem ,和 图形视图框架 .
值的返回通过虚拟 type () 函数。
常量 | 值 | 描述 |
---|---|---|
QGraphicsEllipseItem::Type
|
4
|
图形椭圆项 |
将项的矩形设为矩形,定义通过 ( x , y ) 和给定 width and height .
此方便函数相当于调用
setRect(QRectF(x, y, width, height))
另请参阅 rect ().
Constructs a QGraphicsEllipseItem using the rectangle defined by ( x , y ) 和给定 width and height , as the default rectangle. parent 会被传递给 QAbstractGraphicsShapeItem 的构造函数。
另请参阅 QGraphicsScene::addItem ().
Constructs a QGraphicsEllipseItem using rect 作为默认矩形。 parent 会被传递给 QAbstractGraphicsShapeItem 的构造函数。
另请参阅 QGraphicsScene::addItem ().
Constructs a QGraphicsEllipseItem. parent 会被传递给 QAbstractGraphicsShapeItem 的构造函数。
另请参阅 QGraphicsScene::addItem ().
[virtual]
QGraphicsEllipseItem::
~QGraphicsEllipseItem
()
销毁 QGraphicsEllipseItem .
[override virtual]
QRectF
QGraphicsEllipseItem::
boundingRect
() const
重实现: QGraphicsItem::boundingRect () const.
[override virtual]
bool
QGraphicsEllipseItem::
contains
(const
QPointF
&
point
) const
重实现: QGraphicsItem::contains (const QPointF &point) const.
[override virtual]
bool
QGraphicsEllipseItem::
isObscuredBy
(const
QGraphicsItem
*
item
) const
重实现: QAbstractGraphicsShapeItem::isObscuredBy (const QGraphicsItem *item) const.
[override virtual]
QPainterPath
QGraphicsEllipseItem::
opaqueArea
() const
重实现: QAbstractGraphicsShapeItem::opaqueArea () const.
[override virtual]
void
QGraphicsEllipseItem::
paint
(
QPainter
*
painter
, const
QStyleOptionGraphicsItem
*
option
,
QWidget
*
widget
= nullptr)
重实现: QGraphicsItem::paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget).
Returns the item's ellipse geometry as a QRectF .
另请参阅 setRect () 和 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.
另请参阅 rect () 和 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).
另请参阅 spanAngle (), setStartAngle (),和 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.
另请参阅 startAngle (), setSpanAngle (),和 QPainter::drawPie ().
[override virtual]
QPainterPath
QGraphicsEllipseItem::
shape
() const
重实现: QGraphicsItem::shape () 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).
另请参阅 setSpanAngle () 和 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.
另请参阅 setStartAngle () 和 spanAngle ().
[override virtual]
int
QGraphicsEllipseItem::
type
() const
重实现: QGraphicsItem::type () const.