A class for drawing markers. More...

#include <qwt_plot_marker.h>

Inheritance diagram for QwtPlotMarker:

Classes
class	PrivateData

Public Types
enum	LineStyle { NoLine , HLine , VLine , Cross }
	Line styles. More...

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_PlotGraphic , Rtti_PlotTradingCurve , Rtti_PlotBarChart , Rtti_PlotMultiBarChart , Rtti_PlotShape , Rtti_PlotTextLabel , Rtti_PlotZone , Rtti_PlotVectorField , 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/绘图项关注的事件类型 More...

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

Public Member Functions
	QwtPlotMarker ()
	Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.

	QwtPlotMarker (const QString &title)
	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 QWT_OVERRIDE

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)
	Set the line style.

LineStyle	lineStyle () const

void	setLinePen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign a line pen.

void	setLinePen (const QPen &)
	Specify a pen for the line.

const QPen &	linePen () const

void	setSymbol (const QwtSymbol *)
	Assign a symbol.

const QwtSymbol *	symbol () const

void	setLabel (const QwtText &)
	Set the label.

QwtText	label () const

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

Qt::Alignment	labelAlignment () const

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

Qt::Orientation	labelOrientation () const

void	setSpacing (int)
	Set the spacing.

int	spacing () const

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const QWT_OVERRIDE
	Draw the marker.

virtual QRectF	boundingRect () const QWT_OVERRIDE

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

Public Member Functions inherited from QwtPlotItem
	QwtPlotItem ()
	Constructor.

	QwtPlotItem (const QString &title)
	Constructor.

	QwtPlotItem (const QwtText &title)
	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)
	Set a new title.

void	setTitle (const QwtText &title)
	Set a new title.

const QwtText &	title () const

void	setItemAttribute (ItemAttribute, bool on=true)
	Toggle an item attribute.

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute.

void	setItemInterest (ItemInterest, bool on=true)
	Toggle an item interest.

bool	testItemInterest (ItemInterest) const
	Test an item interest.

void	setRenderHint (RenderHint, bool on=true)
	Toggle an render hint.

bool	testRenderHint (RenderHint) const
	Test a render hint.

void	setRenderThreadCount (uint numThreads)
	On multi core systems rendering of certain plot item ( f.e QwtPlotRasterItem ) can be done in parallel in several threads.

uint	renderThreadCount () const

void	setLegendIconSize (const QSize &)
	Set the size of the legend icon.

QSize	legendIconSize () const

double	z () const
	Plot items are painted in increasing z-order.

void	setZ (double z)
	Set the z value.

void	show ()
	Show the item.

void	hide ()
	Hide the item.

virtual void	setVisible (bool)
	Show/Hide the item.

bool	isVisible () const

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set X and Y axis.

void	setXAxis (QwtAxisId)
	Set the X axis.

QwtAxisId	xAxis () const
	Return xAxis.

void	setYAxis (QwtAxisId)
	Set the Y axis.

QwtAxisId	yAxis () const
	Return yAxis.

virtual void	itemChanged ()
	Update the legend and call QwtPlot::autoRefresh() for the parent plot.

virtual void	legendChanged ()
	Update the legend of the parent plot.

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

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

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

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

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

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

Protected Member Functions
virtual void	drawLines (QPainter *, const QRectF &, const QPointF &) const
	Draw the lines marker.

virtual void	drawSymbol (QPainter *, const QRectF &, const QPointF &) const
	Draw the symbol of the marker.

virtual void	drawLabel (QPainter *, const QRectF &, const QPointF &) const
	Align and draw the text label of the marker.

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

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

◆ LineStyle

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

◆ boundingRect()

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.

◆ draw()

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.

◆ drawLabel()

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(), drawSymbol()

◆ drawLines()

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(), drawSymbol()

◆ drawSymbol()

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

protectedvirtual

Draw the symbol 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()

◆ label()

QwtText QwtPlotMarker::label ( ) const

Returns: the label

See also: setLabel()

◆ labelAlignment()

Qt::Alignment QwtPlotMarker::labelAlignment ( ) const

Returns: the label alignment

See also: setLabelAlignment(), setLabelOrientation()

◆ labelOrientation()

Qt::Orientation QwtPlotMarker::labelOrientation ( ) const

Returns: the label orientation

See also: setLabelOrientation(), labelAlignment()

◆ legendIcon()

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.

◆ linePen()

const QPen & QwtPlotMarker::linePen ( ) const

Returns: the line pen

See also: setLinePen()

◆ lineStyle()

QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle ( ) const

Returns: the line style

See also: setLineStyle()

◆ rtti()

int QwtPlotMarker::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotMarker

Reimplemented from QwtPlotItem.

◆ setLabel()

void QwtPlotMarker::setLabel ( const QwtText & label )

Set the label.

Parameters

label Label text

See also: label()

◆ setLabelAlignment()

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()

◆ setLabelOrientation()

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()

◆ setLinePen() [1/2]

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

color	Pen color
width	Pen width
style	Pen style

See also: pen(), brush()

◆ setLinePen() [2/2]

void QwtPlotMarker::setLinePen ( const QPen & pen )

Specify a pen for the line.

Parameters

pen New pen

See also: linePen()

◆ setLineStyle()

void QwtPlotMarker::setLineStyle ( LineStyle style )

Set the line style.

Parameters

style Line style.

See also: lineStyle()

◆ setSpacing()

void QwtPlotMarker::setSpacing ( int spacing )

Set the spacing.

When the label is not centered on the marker position, the spacing is the distance between the position and the label.

Parameters

spacing Spacing

See also: spacing(), setLabelAlignment()

◆ setSymbol()

void QwtPlotMarker::setSymbol ( const QwtSymbol * symbol )

Assign a symbol.

Parameters

symbol New symbol

See also: symbol()

◆ spacing()

int QwtPlotMarker::spacing ( ) const

Returns: the spacing

See also: setSpacing()

◆ symbol()

const QwtSymbol * QwtPlotMarker::symbol ( ) const

Returns: the symbol

See also: setSymbol(), QwtSymbol

The documentation for this class was generated from the following files:

/home/runner/work/QWT/QWT/src/qwt_plot_marker.h
/home/runner/work/QWT/QWT/src/qwt_plot_marker.cpp

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ LineStyle

Member Function Documentation

◆ boundingRect()

◆ draw()

◆ drawLabel()

◆ drawLines()

◆ drawSymbol()

◆ label()

◆ labelAlignment()

◆ labelOrientation()

◆ legendIcon()

◆ linePen()

◆ lineStyle()

◆ rtti()

◆ setLabel()

◆ setLabelAlignment()

◆ setLabelOrientation()

◆ setLinePen() [1/2]

◆ setLinePen() [2/2]

◆ setLineStyle()

◆ setSpacing()

◆ setSymbol()

◆ spacing()

◆ symbol()