Base class for items on the plot canvas. Más...

#include <qwt_plot_item.h>

Diagrama de herencias de QwtPlotItem

Clases
class	PrivateData
Tipos públicos
enum	RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotUserItem = 1000 }
enum	ItemAttribute { Legend = 1, AutoScale = 2 }
Métodos públicos
	QwtPlotItem (const QwtText &title=QwtText())
	Constructor.
virtual	~QwtPlotItem ()
	Destroy the QwtPlotItem.
void	attach (QwtPlot *plot)
	Attach the item to a plot.
void	detach ()
	This method detaches a QwtPlotItem from any QwtPlot it has been associated with.
QwtPlot *	plot () const
	Return attached plot.
void	setTitle (const QString &title)
void	setTitle (const QwtText &title)
const QwtText &	title () const
virtual int	rtti () const
void	setItemAttribute (ItemAttribute, bool on=true)
bool	testItemAttribute (ItemAttribute) const
double	z () const
void	setZ (double z)
	Set the z value.
void	show ()
	Show the item.
void	hide ()
	Hide the item.
virtual void	setVisible (bool)
bool	isVisible () const
void	setAxis (int xAxis, int yAxis)
void	setXAxis (int axis)
int	xAxis () const
	Return xAxis.
void	setYAxis (int axis)
int	yAxis () const
	Return yAxis.
virtual void	itemChanged ()
virtual void	draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &canvasRect) const =0
	Draw the item.
virtual QwtDoubleRect	boundingRect () const
virtual void	updateLegend (QwtLegend *) const
	Update the widget that represents the item on the legend.
virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
	Update the item to changes of the axes scale division.
virtual QWidget *	legendItem () const
	Allocate the widget that represents the item on the legend.
QwtDoubleRect	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding scale rect of 2 maps.
QRect	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding paint rect of 2 maps.
QRect	transform (const QwtScaleMap &, const QwtScaleMap &, const QwtDoubleRect &) const
QwtDoubleRect	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const

Descripción detallada

Base class for items on the plot canvas.

Documentación de las enumeraciones miembro de la clase

enum QwtPlotItem::ItemAttribute

Valores de enumeraciones:

Legend
AutoScale

enum QwtPlotItem::RttiValues

Valores de enumeraciones:

Rtti_PlotItem
Rtti_PlotGrid
Rtti_PlotScale
Rtti_PlotMarker
Rtti_PlotCurve
Rtti_PlotHistogram
Rtti_PlotSpectrogram
Rtti_PlotSVG
Rtti_PlotUserItem

Documentación del constructor y destructor

QwtPlotItem::QwtPlotItem ( const QwtText & title = QwtText() ) [explicit]

Constructor.

QwtPlotItem::~QwtPlotItem ( ) [virtual]

Destroy the QwtPlotItem.

Documentación de las funciones miembro

void QwtPlotItem::attach ( QwtPlot * plot )

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to.

Ver también:: QwtPlotItem::detach()

QwtDoubleRect QwtPlotItem::boundingRect ( ) const [virtual]

Devuelve:: An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)

Reimplementado en QwtPlotCurve, QwtPlotMarker, QwtPlotSpectrogram y QwtPlotSvgItem.

void QwtPlotItem::detach ( ) [inline]

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

detach() is equivalent to calling attach( NULL )

Ver también:: attach( QwtPlot* plot )

virtual void QwtPlotItem::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRect &	canvasRect
	)		const `[pure virtual]`

Draw the item.

Parámetros:

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rect of the canvas in painter coordinates

Implementado en QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotRasterItem, QwtPlotScaleItem, QwtPlotSpectrogram y QwtPlotSvgItem.

void QwtPlotItem::hide ( )

Hide the item.

QwtDoubleRect QwtPlotItem::invTransform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRect &	rect
	)		const

Transform a rectangle from paint to scale coordinates

Parámetros:

xMap	X map
yMap	Y map
rect	Rectangle in paint coordinates

Devuelve:: Rectangle in scale coordinates

Ver también:: transform()

bool QwtPlotItem::isVisible ( ) const

Devuelve:: true if visible

Ver también:: setVisible(), show(), hide()

void QwtPlotItem::itemChanged ( ) [virtual]

Update the legend and call QwtPlot::autoRefresh for the parent plot.

Ver también:: updateLegend()

QWidget * QwtPlotItem::legendItem ( ) const [virtual]

Allocate the widget that represents the item on the legend.

The default implementation is made for QwtPlotCurve and returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().

Devuelve:: QwtLegendItem()

Ver también:: updateLegend() QwtLegend()

Implementa QwtLegendItemManager.

QRect QwtPlotItem::paintRect	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap
	)		const

Calculate the bounding paint rect of 2 maps.

Parámetros:

xMap	X map
yMap	X map

Devuelve:: Bounding rect of the scale maps

QwtPlot * QwtPlotItem::plot ( ) const

Return attached plot.

int QwtPlotItem::rtti ( ) const [virtual]

Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them.

The rtti value is useful for environments, where the runtime type information is disabled and it is not possible to do a dynamic_cast<...>.

Devuelve:: rtti value

Ver también:: RttiValues

Reimplementado en QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotScaleItem, QwtPlotSpectrogram y QwtPlotSvgItem.

QwtDoubleRect QwtPlotItem::scaleRect	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap
	)		const

Calculate the bounding scale rect of 2 maps.

Parámetros:

xMap	X map
yMap	X map

Devuelve:: Bounding rect of the scale maps

void QwtPlotItem::setAxis	(	int	xAxis,
		int	yAxis
	)

Set X and Y axis

The item will painted according to the coordinates its Axes.

Parámetros:

xAxis	X Axis
yAxis	Y Axis

Ver también:: setXAxis(), setYAxis(), xAxis(), yAxis()

void QwtPlotItem::setItemAttribute	(	ItemAttribute	attribute,
		bool	on = `true`
	)

Toggle an item attribute

Parámetros:

attribute	Attribute type
on	true/false

Ver también:: testItemAttribute(), ItemAttribute

void QwtPlotItem::setTitle ( const QString & title )

Set a new title

Parámetros:

title Title

Ver también:: title()

void QwtPlotItem::setTitle ( const QwtText & title )

Set a new title

Parámetros:

title Title

Ver también:: title()

void QwtPlotItem::setVisible ( bool on ) [virtual]

Show/Hide the item

Parámetros:

on	Show if true, otherwise hide

Ver también:: isVisible(), show(), hide()

void QwtPlotItem::setXAxis ( int axis )

Set the X axis

The item will painted according to the coordinates its Axes.

Parámetros:

axis X Axis

Ver también:: setAxis(), setYAxis(), xAxis()

void QwtPlotItem::setYAxis ( int axis )

Set the Y axis

The item will painted according to the coordinates its Axes.

Parámetros:

axis Y Axis

Ver también:: setAxis(), setXAxis(), yAxis()

void QwtPlotItem::setZ ( double z )

Set the z value.

Plot items are painted in increasing z-order.

Parámetros:

z Z-value

Ver también:: z(), QwtPlotDict::itemList()

void QwtPlotItem::show ( )

Show the item.

bool QwtPlotItem::testItemAttribute ( ItemAttribute attribute ) const

Test an item attribute

Parámetros:

ItemAttribute Attribute type

Devuelve:: true/false

Ver también:: setItemAttribute(), ItemAttribute

const QwtText & QwtPlotItem::title ( ) const

Devuelve:: Title of the item

Ver también:: setTitle()

QRect QwtPlotItem::transform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QwtDoubleRect &	rect
	)		const

Transform a rectangle

Parámetros:

xMap	X map
yMap	Y map
rect	Rectangle in scale coordinates

Devuelve:: Rectangle in paint coordinates

Ver también:: invTransform()

void QwtPlotItem::updateLegend ( QwtLegend * legend ) const [virtual]

Update the widget that represents the item on the legend.

updateLegend() is called from itemChanged() to adopt the widget representing the item on the legend to its new configuration.

The default implementation is made for QwtPlotCurve and updates a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().

Ver también:: legendItem(), itemChanged(), QwtLegend()

Implementa QwtLegendItemManager.

Reimplementado en QwtPlotCurve.

void QwtPlotItem::updateScaleDiv	(	const QwtScaleDiv &	,
		const QwtScaleDiv &
	)		`[virtual]`

Update the item to changes of the axes scale division.

Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()

Parámetros: