Referencia de la Clase QCPItemAnchor

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

Diagrama de herencias de QCPItemAnchor

Métodos públicos
	QCPItemAnchor (QCustomPlot *parentPlot, QCPAbstractItem *parentItem, const QString name, int anchorId=-1)
QString	name () const
virtual QPointF	pixelPoint () const

Métodos protegidos
virtual QCPItemPosition *	toQCPItemPosition ()
void	addChild (QCPItemPosition *pos)
void	removeChild (QCPItemPosition *pos)

Atributos protegidos
QString	mName
QCustomPlot *	mParentPlot
QCPAbstractItem *	mParentItem
int	mAnchorId
QSet< QCPItemPosition * >	mChildren

Amigas
class	QCPItemPosition

Descripción detallada

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

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.

Documentación del constructor y destructor

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.

Documentación de las funciones miembro

QPointF QCPItemAnchor::pixelPoint ( ) 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.

Reimplementado en QCPItemPosition.

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).

Reimplementado en QCPItemPosition.

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La documentación para esta clase fue generada a partir de los siguientes ficheros:

• qcustomplot.h
• qcustomplot.cpp