A class for drawing markers. More...

#include <qwt_plot_marker.h>

Inheritance diagram for QwtPlotMarker:

Public Types
enum	LineStyle { NoLine, HLine, VLine, Cross }

Public Types inherited from QwtPlotItem
enum	RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotTradingCurve, Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel, Rtti_PlotZone, Rtti_PlotUserItem = 1000 }
	Runtime type information. More...

enum	ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 }
	Plot Item Attributes. More...

enum	ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 }
	Plot Item Interests. More...

enum	RenderHint { RenderAntialiased = 0x1 }
	Render hints. More...

typedef QFlags< ItemAttribute >	ItemAttributes
	Plot Item Attributes.

typedef QFlags< ItemInterest >	ItemInterests
	Plot Item Interests.

typedef QFlags< RenderHint >	RenderHints
	Render hints.

Public Member Functions
	QwtPlotMarker (const QString &title=QString::null)
	Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.

	QwtPlotMarker (const QwtText &title)
	Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.

virtual	~QwtPlotMarker ()
	Destructor.

virtual int	rtti () const

double	xValue () const
	Return x Value.

double	yValue () const
	Return y Value.

QPointF	value () const
	Return Value.

void	setXValue (double)
	Set X Value.

void	setYValue (double)
	Set Y Value.

void	setValue (double, double)
	Set Value.

void	setValue (const QPointF &)
	Set Value.

void	setLineStyle (LineStyle st)
	Set the line style. More...

LineStyle	lineStyle () const

void	setLinePen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)

void	setLinePen (const QPen &p)

const QPen &	linePen () const

void	setSymbol (const QwtSymbol *)
	Assign a symbol. More...

const QwtSymbol *	symbol () const

void	setLabel (const QwtText &)
	Set the label. More...

QwtText	label () const

void	setLabelAlignment (Qt::Alignment)
	Set the alignment of the label. More...

Qt::Alignment	labelAlignment () const

void	setLabelOrientation (Qt::Orientation)
	Set the orientation of the label. More...

Qt::Orientation	labelOrientation () const

void	setSpacing (int)
	Set the spacing. More...

int	spacing () const

virtual void	draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const

virtual QRectF	boundingRect () const

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const

Public Member Functions inherited from QwtPlotItem
	QwtPlotItem (const QwtText &title=QwtText())

virtual	~QwtPlotItem ()
	Destroy the QwtPlotItem.

void	attach (QwtPlot *plot)
	Attach the item to a plot. More...

void	detach ()
	This method detaches a QwtPlotItem from any QwtPlot it has been associated with. More...

QwtPlot *	plot () const
	Return attached plot.

void	setTitle (const QString &title)

void	setTitle (const QwtText &title)

const QwtText &	title () const

void	setItemAttribute (ItemAttribute, bool on=true)

bool	testItemAttribute (ItemAttribute) const

void	setItemInterest (ItemInterest, bool on=true)

bool	testItemInterest (ItemInterest) const

void	setRenderHint (RenderHint, bool on=true)

bool	testRenderHint (RenderHint) const

void	setRenderThreadCount (uint numThreads)

uint	renderThreadCount () const

void	setLegendIconSize (const QSize &)

QSize	legendIconSize () const

double	z () const

void	setZ (double z)
	Set the z value. More...

void	show ()
	Show the item.

void	hide ()
	Hide the item.

virtual void	setVisible (bool)

bool	isVisible () const

void	setAxes (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	legendChanged ()

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasSize, double &left, double &top, double &right, double &bottom) const
	Calculate a hint for the canvas margin. More...

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
	Update the item to changes of the axes scale division. More...

virtual void	updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
	Update the item to changes of the legend info. More...

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding scale rectangle of 2 maps. More...

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding paint rectangle of 2 maps. More...

virtual QList< QwtLegendData >	legendData () const
	Return all information, that is needed to represent the item on the legend. More...

Protected Member Functions
virtual void	drawLines (QPainter *, const QRectF &, const QPointF &) const

virtual void	drawLabel (QPainter *, const QRectF &, const QPointF &) const

Protected Member Functions inherited from QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Return a default icon from a brush. More...

Detailed Description

A class for drawing markers.

A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.

The setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.

With setLabel(), a label can be assigned to the marker. The setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to Qt::AlignLeft | Qt::AlignTop.

Note: QwtPlotTextLabel is intended to align a text label according to the geometry of canvas ( unrelated to plot coordinates )

Member Enumeration Documentation

enum QwtPlotMarker::LineStyle

Line styles.

See Also: setLineStyle(), lineStyle()

Enumerator
NoLine	No line.
HLine	A horizontal line.
VLine	A vertical line.
Cross	A crosshair.

Member Function Documentation

QRectF QwtPlotMarker::boundingRect ( ) const

virtual

Returns: An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note: A width or height < 0.0 is ignored by the autoscaler

Reimplemented from QwtPlotItem.

void QwtPlotMarker::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const

virtual

Draw the marker

Parameters

painter	Painter
xMap	x Scale Map
yMap	y Scale Map
canvasRect	Contents rectangle of the canvas in painter coordinates

Implements QwtPlotItem.

void QwtPlotMarker::drawLabel	(	QPainter *	painter,
		const QRectF &	canvasRect,
		const QPointF &	pos
	)		const

protectedvirtual

Align and draw the text label of the marker

Parameters

painter	Painter
canvasRect	Contents rectangle of the canvas in painter coordinates
pos	Position of the marker, translated into widget coordinates

See Also: drawLabel(), QwtSymbol::drawSymbol()

void QwtPlotMarker::drawLines	(	QPainter *	painter,
		const QRectF &	canvasRect,
		const QPointF &	pos
	)		const

protectedvirtual

Draw the lines marker

Parameters

painter	Painter
canvasRect	Contents rectangle of the canvas in painter coordinates
pos	Position of the marker, translated into widget coordinates

See Also: drawLabel(), QwtSymbol::drawSymbol()

QwtText QwtPlotMarker::label ( ) const

Returns: the label

See Also: setLabel()

Qt::Alignment QwtPlotMarker::labelAlignment ( ) const

Returns: the label alignment

See Also: setLabelAlignment(), setLabelOrientation()

Qt::Orientation QwtPlotMarker::labelOrientation ( ) const

Returns: the label orientation

See Also: setLabelOrientation(), labelAlignment()

QwtGraphic QwtPlotMarker::legendIcon	(	int	index,
		const QSizeF &	size
	)		const

virtual

Returns: Icon representing the marker on the legend

Parameters

index	Index of the legend entry ( usually there is only one )
size	Icon size

See Also: setLegendIconSize(), legendData()

Reimplemented from QwtPlotItem.

const QPen & QwtPlotMarker::linePen ( ) const

Returns: the line pen

See Also: setLinePen()

QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle ( ) const

Returns: the line style

See Also: setLineStyle()

int QwtPlotMarker::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotMarker

Reimplemented from QwtPlotItem.

void QwtPlotMarker::setLabel ( const QwtText & label )

Set the label.

Parameters

label Label text

See Also: label()

void QwtPlotMarker::setLabelAlignment ( Qt::Alignment align )

Set the alignment of the label.

In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.

In all other styles the alignment is relative to the marker's position.

Parameters

align Alignment.

See Also: labelAlignment(), labelOrientation()

void QwtPlotMarker::setLabelOrientation ( Qt::Orientation orientation )

Set the orientation of the label.

When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).

Parameters

orientation Orientation of the label

See Also: labelOrientation(), setLabelAlignment()

void QwtPlotMarker::setLinePen	(	const QColor &	color,
		qreal	width = `0.0`,
		Qt::PenStyle	style = `Qt::SolidLine`
	)

Build and assign a line pen

In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() ). This method has been introduced to hide this incompatibility.

Parameters