Dokumentacja klasy QCPItemAnchor

An anchor of an item to which positions can be attached to. Więcej...

#include <qcustomplot.hh>

Diagram dziedziczenia dla QCPItemAnchor

Diagram współpracy dla QCPItemAnchor:

Metody publiczne
	QCPItemAnchor (QCustomPlot *parentPlot, QCPAbstractItem *parentItem, const QString &name, int anchorId=-1)
virtual	~QCPItemAnchor ()
QString	name () const
virtual QPointF	pixelPosition () const

Metody chronione
virtual QCPItemPosition *	toQCPItemPosition ()
void	addChildX (QCPItemPosition *pos)
void	removeChildX (QCPItemPosition *pos)
void	addChildY (QCPItemPosition *pos)
void	removeChildY (QCPItemPosition *pos)

Atrybuty chronione
QString	mName
QCustomPlot *	mParentPlot
QCPAbstractItem *	mParentItem
int	mAnchorId
QSet< QCPItemPosition * >	mChildrenX
QSet< QCPItemPosition * >	mChildrenY

Przyjaciele
class	QCPItemPosition

Opis szczegółowy

An item (QCPAbstractItem) may have one or more anchors. Unlike QCPItemPosition, an anchor doesn't control anything on its item, but provides a way to tie other items via their positions to the anchor.

For example, a QCPItemRect is defined by its positions topLeft and bottomRight. Additionally it has various anchors like top, topRight or bottomLeft etc. So you can attach the start (which is a QCPItemPosition) of a QCPItemLine to one of the anchors by calling QCPItemPosition::setParentAnchor on start, passing the wanted anchor of the QCPItemRect. This way the start of the line will now always follow the respective anchor location on the rect item.

Note that QCPItemPosition derives from QCPItemAnchor, so every position can also serve as an anchor to other positions.

To learn how to provide anchors in your own item subclasses, see the subclassing section of the QCPAbstractItem documentation.

Dokumentacja konstruktora i destruktora

QCPItemAnchor::QCPItemAnchor	(	QCustomPlot *	parentPlot,
		QCPAbstractItem *	parentItem,
		const QString &	name,
		int	anchorId = -1
	)

Creates a new QCPItemAnchor. You shouldn't create QCPItemAnchor instances directly, even if you want to make a new item subclass. Use QCPAbstractItem::createAnchor instead, as explained in the subclassing section of the QCPAbstractItem documentation.

QCPItemAnchor::~QCPItemAnchor ( )

virtual

Dokumentacja funkcji składowych

void QCPItemAnchor::addChildX ( QCPItemPosition *  pos )

protected

void QCPItemAnchor::addChildY ( QCPItemPosition *  pos )

protected

QString QCPItemAnchor::name ( ) const

inline

QPointF QCPItemAnchor::pixelPosition ( ) const

virtual

Returns the final absolute pixel position of the QCPItemAnchor on the QCustomPlot surface.

The pixel information is internally retrieved via QCPAbstractItem::anchorPixelPosition of the parent item, QCPItemAnchor is just an intermediary.

Reimplementowana w QCPItemPosition.

void QCPItemAnchor::removeChildX ( QCPItemPosition *  pos )

protected

void QCPItemAnchor::removeChildY ( QCPItemPosition *  pos )

protected

QCPItemPosition * QCPItemAnchor::toQCPItemPosition ( )

inlineprotectedvirtual

Returns 0 if this instance is merely a QCPItemAnchor, and a valid pointer of type QCPItemPosition* if it actually is a QCPItemPosition (which is a subclass of QCPItemAnchor).

This safe downcast functionality could also be achieved with a dynamic_cast. However, QCustomPlot avoids dynamic_cast to work with projects that don't have RTTI support enabled (e.g. -fno-rtti flag with gcc compiler).

Reimplementowana w QCPItemPosition.

Dokumentacja przyjaciół i funkcji związanych

friend class QCPItemPosition

friend

Dokumentacja atrybutów składowych

int QCPItemAnchor::mAnchorId

protected

QSet<QCPItemPosition*> QCPItemAnchor::mChildrenX

protected

QSet<QCPItemPosition*> QCPItemAnchor::mChildrenY

protected

QString QCPItemAnchor::mName

protected

QCPAbstractItem* QCPItemAnchor::mParentItem

protected

QCustomPlot* QCPItemAnchor::mParentPlot

protected

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Dokumentacja dla tej klasy została wygenerowana z plików:

• qcustomplot.hh
• qcustomplot.cpp