内容

• 公共类型
• 公共函数
• 重实现公共函数
• 详细描述

QGraphicsPolygonItem 类

QGraphicsPolygonItem 类提供的多边形项可以被添加到 QGraphicsScene . 更多...

头：	#include <QGraphicsPolygonItem>
CMake:	find_package(Qt6 COMPONENTS Widgets REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake:	QT += widgets
继承：	QAbstractGraphicsShapeItem

• 所有成员列表，包括继承成员

公共类型

enum	anonymous { Type }

公共函数

	QGraphicsPolygonItem (const QPolygonF & polygon , QGraphicsItem * parent = nullptr)
	QGraphicsPolygonItem (QGraphicsItem * parent = nullptr)
virtual	~QGraphicsPolygonItem ()
Qt::FillRule	fillRule () const
QPolygonF	polygon () const
void	setFillRule (Qt::FillRule rule )
void	setPolygon (const QPolygonF & polygon )

重实现公共函数

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

详细描述

要设置项的多边形，传递 QPolygonF 到 QGraphicsPolygonItem 的构造函数，或调用 setPolygon () 函数。 polygon () 函数返回当前多边形。

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

另请参阅 QGraphicsPathItem , QGraphicsRectItem , QGraphicsEllipseItem , QGraphicsTextItem , QGraphicsLineItem , QGraphicsPixmapItem ，和 图形视图框架 .

成员类型文档编制

enum QGraphicsPolygonItem:: anonymous

值的返回通过虚拟 type () 函数。

常量	值	描述
QGraphicsPolygonItem::Type	5	A graphics polygon item

成员函数文档编制

QGraphicsPolygonItem:: QGraphicsPolygonItem (const QPolygonF & polygon , QGraphicsItem * parent = nullptr)

构造 QGraphicsPolygonItem 采用 polygon 作为默认多边形。 parent 会被传递给 QAbstractGraphicsShapeItem 的构造函数。

另请参阅 QGraphicsScene::addItem ().

QGraphicsPolygonItem:: QGraphicsPolygonItem ( QGraphicsItem * parent = nullptr)

构造 QGraphicsPolygonItem。 parent 会被传递给 QAbstractGraphicsShapeItem 的构造函数。

另请参阅 QGraphicsScene::addItem ().

[虚拟] QGraphicsPolygonItem:: ~QGraphicsPolygonItem ()

销毁 QGraphicsPolygonItem .

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

重实现： QGraphicsItem::boundingRect () const.

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

重实现： QGraphicsItem::contains (const QPointF &point) const.

Qt::FillRule QGraphicsPolygonItem:: fillRule () const

返回多边形填充规则。默认填充规则为 Qt::OddEvenFill .

另请参阅 setFillRule (), QPainterPath::fillRule ()，和 QPainter::drawPolygon ().

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

重实现： QAbstractGraphicsShapeItem::isObscuredBy (const QGraphicsItem *item) const.

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

重实现： QAbstractGraphicsShapeItem::opaqueArea () const.

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

重实现： QGraphicsItem::paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget).

QPolygonF QGraphicsPolygonItem:: polygon () const

Returns the item's polygon, or an empty polygon if no polygon has been set.

另请参阅 setPolygon ().

void QGraphicsPolygonItem:: setFillRule ( Qt::FillRule rule )

Sets the fill rule of the polygon to rule . The default fill rule is Qt::OddEvenFill .

另请参阅 fillRule (), QPainterPath::fillRule ()，和 QPainter::drawPolygon ().

void QGraphicsPolygonItem:: setPolygon (const QPolygonF & polygon )

将项的多边形设为给定 polygon .

另请参阅 polygon ().

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

重实现： QGraphicsItem::shape () const.

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

重实现： QGraphicsItem::type () const.