QwtPlotTradingCurve illustrates movements in the price of a financial instrument over time. More...

#include <qwt_plot_tradingcurve.h>

Inheritance diagram for QwtPlotTradingCurve:

Classes
class	PrivateData

Public Types
enum	SymbolStyle { NoSymbol = -1 , Bar , CandleStick , UserSymbol = 100 }
	Symbol styles. More...

enum	Direction { Increasing , Decreasing }
	Direction of a price movement. More...

enum	PaintAttribute { ClipSymbols = 0x01 }
	Attributes to modify the drawing algorithm. 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
	QwtPlotTradingCurve (const QString &title=QString())
	Constructor.

	QwtPlotTradingCurve (const QwtText &title)
	Constructor.

virtual	~QwtPlotTradingCurve ()
	Destructor.

virtual int	rtti () const QWT_OVERRIDE

void	setPaintAttribute (PaintAttribute, bool on=true)
	Specify an attribute how to draw the curve.

bool	testPaintAttribute (PaintAttribute) const

void	setSamples (const QVector< QwtOHLCSample > &)
	Initialize data with an array of samples.

void	setSamples (QwtSeriesData< QwtOHLCSample > *)
	Assign a series of samples.

void	setSymbolStyle (SymbolStyle style)
	Set the symbol style.

SymbolStyle	symbolStyle () const

void	setSymbolPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	Build and assign the symbol pen.

void	setSymbolPen (const QPen &)
	Set the symbol pen.

QPen	symbolPen () const

void	setSymbolBrush (Direction, const QBrush &)
	Set the symbol brush.

QBrush	symbolBrush (Direction) const

void	setSymbolExtent (double)
	Set the extent of the symbol.

double	symbolExtent () const

void	setMinSymbolWidth (double)
	Set a minimum for the symbol width.

double	minSymbolWidth () const

void	setMaxSymbolWidth (double)
	Set a maximum for the symbol width.

double	maxSymbolWidth () const

virtual void	drawSeries (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const QWT_OVERRIDE
	Draw an interval of the curve.

virtual QRectF	boundingRect () const QWT_OVERRIDE

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

Public Member Functions inherited from QwtPlotSeriesItem
	QwtPlotSeriesItem (const QString &title=QString())
	Constructor.

	QwtPlotSeriesItem (const QwtText &title)
	Constructor.

virtual	~QwtPlotSeriesItem ()
	Destructor.

void	setOrientation (Qt::Orientation)
	Set the orientation of the item.

Qt::Orientation	orientation () const

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

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

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	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.

Public Member Functions inherited from QwtAbstractSeriesStore
virtual	~QwtAbstractSeriesStore ()
	Destructor.

Public Member Functions inherited from QwtSeriesStore< QwtOHLCSample >
	QwtSeriesStore ()
	Constructor The store contains no series.

	~QwtSeriesStore ()
	Destructor.

void	setData (QwtSeriesData< QwtOHLCSample > *series)
	Assign a series of samples.

QwtSeriesData< QwtOHLCSample > *	data ()

const QwtSeriesData< QwtOHLCSample > *	data () const

QwtOHLCSample	sample (size_t index) const

virtual size_t	dataSize () const QWT_OVERRIDE

virtual QRectF	dataRect () const QWT_OVERRIDE

virtual void	setRectOfInterest (const QRectF &rect) QWT_OVERRIDE
	Set a the "rect of interest" for the series.

QwtSeriesData< QwtOHLCSample > *	swapData (QwtSeriesData< QwtOHLCSample > *series)
	Replace a series without deleting the previous one.

Protected Member Functions
void	init ()
	Initialize internal members.

virtual void	drawSymbols (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
	Draw symbols.

virtual void	drawUserSymbol (QPainter *, SymbolStyle, const QwtOHLCSample &, Qt::Orientation, bool inverted, double symbolWidth) const
	Draw a symbol for a symbol style >= UserSymbol.

void	drawBar (QPainter *, const QwtOHLCSample &, Qt::Orientation, bool inverted, double width) const
	Draw a bar.

void	drawCandleStick (QPainter *, const QwtOHLCSample &, Qt::Orientation, double width) const
	Draw a candle stick.

virtual double	scaledSymbolWidth (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const
	Calculate the symbol width in paint coordinates.

Protected Member Functions inherited from QwtPlotSeriesItem
virtual void	dataChanged () QWT_OVERRIDE
	dataChanged() indicates, that the series has been changed.

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

Detailed Description

QwtPlotTradingCurve illustrates movements in the price of a financial instrument over time.

QwtPlotTradingCurve supports candlestick or bar ( OHLC ) charts that are used in the domain of technical analysis.

While the length ( height or width depending on orientation() ) of each symbol depends on the corresponding OHLC sample the size of the other dimension can be controlled using:

setSymbolExtent()
setSymbolMinWidth()
setSymbolMaxWidth()

The extent is a size in scale coordinates, so that the symbol width is increasing when the plot is zoomed in. Minimum/Maximum width is in widget coordinates independent from the zoom level. When setting the minimum and maximum to the same value, the width of the symbol is fixed.

Member Enumeration Documentation

◆ Direction

enum QwtPlotTradingCurve::Direction

Direction of a price movement.

Enumerator
Increasing	The closing price is higher than the opening price.
Decreasing	The closing price is lower than the opening price.

◆ PaintAttribute

enum QwtPlotTradingCurve::PaintAttribute

Attributes to modify the drawing algorithm.

See also: setPaintAttribute(), testPaintAttribute()

Enumerator
ClipSymbols	Check if a symbol is on the plot canvas before painting it.

◆ SymbolStyle

enum QwtPlotTradingCurve::SymbolStyle

Symbol styles.

The default setting is QwtPlotSeriesItem::CandleStick.

See also: setSymbolStyle(), symbolStyle()

Enumerator
NoSymbol	Nothing is displayed.
Bar	A line on the chart shows the price range (the highest and lowest prices) over one unit of time, e.g. one day or one hour. Tick marks project from each side of the line indicating the opening and closing price.
CandleStick	The range between opening/closing price are displayed as a filled box. The fill brush depends on the direction of the price movement. The box is connected to the highest/lowest values by lines.
UserSymbol	SymbolTypes >= UserSymbol are displayed by drawUserSymbol(), that needs to be overloaded and implemented in derived curve classes. See also drawUserSymbol()

Constructor & Destructor Documentation

◆ QwtPlotTradingCurve() [1/2]

QwtPlotTradingCurve::QwtPlotTradingCurve ( const QString & title = QString() )

explicit

Constructor.

Parameters

title Title of the curve

◆ QwtPlotTradingCurve() [2/2]

QwtPlotTradingCurve::QwtPlotTradingCurve ( const QwtText & title )

explicit

Constructor.

Parameters

title Title of the curve

Member Function Documentation

◆ boundingRect()

QRectF QwtPlotTradingCurve::boundingRect ( ) const

virtual

Returns: Bounding rectangle of all samples. For an empty series the rectangle is invalid.

Reimplemented from QwtPlotSeriesItem.

◆ drawBar()

void QwtPlotTradingCurve::drawBar	(	QPainter *	painter,
		const QwtOHLCSample &	sample,
		Qt::Orientation	orientation,
		bool	inverted,
		double	width
	)		const

protected

Draw a bar.

Parameters

painter	Qt painter, initialized with pen/brush
sample	Sample, already translated into paint device coordinates
orientation	Vertical or horizontal
inverted	When inverted is false the open tick is painted to the left/top, otherwise it is painted right/bottom. The close tick is painted in the opposite direction of the open tick. painted in the opposite d opposite direction.
width	Width or height of the candle, depending on the orientation

See also: Bar

◆ drawCandleStick()

void QwtPlotTradingCurve::drawCandleStick	(	QPainter *	painter,
		const QwtOHLCSample &	sample,
		Qt::Orientation	orientation,
		double	width
	)		const

protected

Draw a candle stick.

Parameters

painter	Qt painter, initialized with pen/brush
sample	Samples already translated into paint device coordinates
orientation	Vertical or horizontal
width	Width or height of the candle, depending on the orientation

See also: CandleStick

◆ drawSeries()

void QwtPlotTradingCurve::drawSeries	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		int	from,
		int	to
	)		const

virtual

Draw an interval of the curve.

Parameters

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rectangle of the canvas
from	Index of the first point to be painted
to	Index of the last point to be painted. If to < 0 the curve will be painted to its last point.

See also: drawSymbols()

Implements QwtPlotSeriesItem.

◆ drawSymbols()

void QwtPlotTradingCurve::drawSymbols	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		int	from,
		int	to
	)		const

protectedvirtual

Draw symbols.

Parameters

painter	Painter
xMap	x map
yMap	y map
canvasRect	Contents rectangle of the canvas
from	Index of the first point to be painted
to	Index of the last point to be painted

See also: drawSeries()

◆ drawUserSymbol()

void QwtPlotTradingCurve::drawUserSymbol	(	QPainter *	painter,
		SymbolStyle	symbolStyle,
		const QwtOHLCSample &	sample,
		Qt::Orientation	orientation,
		bool	inverted,
		double	symbolWidth
	)		const

protectedvirtual

Draw a symbol for a symbol style >= UserSymbol.

The implementation does nothing and is intended to be overloaded

Parameters

painter	Qt painter, initialized with pen/brush
symbolStyle	Symbol style
sample	Samples already translated into paint device coordinates
orientation	Vertical or horizontal
inverted	True, when the opposite scale ( Qt::Vertical: x, Qt::Horizontal: y ) is increasing in the opposite direction as QPainter coordinates.
symbolWidth	Width of the symbol in paint device coordinates

◆ legendIcon()

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

virtual

Returns: A rectangle filled with the color of the symbol pen

Parameters

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

See also: setLegendIconSize(), legendData()

Reimplemented from QwtPlotItem.

◆ maxSymbolWidth()

double QwtPlotTradingCurve::maxSymbolWidth ( ) const

Returns: Maximum for the symbol width

See also: setMaxSymbolWidth(), minSymbolWidth(), symbolExtent()

◆ minSymbolWidth()

double QwtPlotTradingCurve::minSymbolWidth ( ) const

Returns: Minmum for the symbol width

See also: setMinSymbolWidth(), maxSymbolWidth(), symbolExtent()

◆ rtti()

int QwtPlotTradingCurve::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotTradingCurve

Reimplemented from QwtPlotItem.

◆ scaledSymbolWidth()

double QwtPlotTradingCurve::scaledSymbolWidth	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const

protectedvirtual

Calculate the symbol width in paint coordinates.

The width is calculated by scaling the symbol extent into paint device coordinates bounded by the minimum/maximum symbol width.

Parameters

xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rectangle of the canvas

Returns: Symbol width in paint coordinates

See also: symbolExtent(), minSymbolWidth(), maxSymbolWidth()

◆ setMaxSymbolWidth()

void QwtPlotTradingCurve::setMaxSymbolWidth ( double width )

Set a maximum for the symbol width.

A value <= 0.0 means an unlimited width

Parameters

width Width in paint device coordinates

See also: maxSymbolWidth(), setMinSymbolWidth(), setSymbolExtent()

◆ setMinSymbolWidth()

void QwtPlotTradingCurve::setMinSymbolWidth ( double width )

Set a minimum for the symbol width.

Parameters

width Width in paint device coordinates

See also: minSymbolWidth(), setMaxSymbolWidth(), setSymbolExtent()

◆ setPaintAttribute()

void QwtPlotTradingCurve::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = `true`
	)

Specify an attribute how to draw the curve.

Parameters

attribute	Paint attribute
on	On/Off

See also: testPaintAttribute()

◆ setSamples() [1/2]

void QwtPlotTradingCurve::setSamples ( const QVector< QwtOHLCSample > & samples )

Initialize data with an array of samples.

Parameters

samples Vector of samples

See also: QwtPlotSeriesItem::setData()

◆ setSamples() [2/2]

void QwtPlotTradingCurve::setSamples ( QwtSeriesData< QwtOHLCSample > * data )

Assign a series of samples.

setSamples() is just a wrapper for setData() without any additional value - beside that it is easier to find for the developer.

Parameters

data Data

Warning: The item takes ownership of the data object, deleting it when its not used anymore.

◆ setSymbolBrush()

void QwtPlotTradingCurve::setSymbolBrush	(	Direction	direction,
		const QBrush &	brush
	)

Set the symbol brush.

Parameters

direction	Direction type
brush	Brush used to fill the body of all candlestick symbols with the direction

See also: symbolBrush(), setSymbolPen()

◆ setSymbolExtent()

void QwtPlotTradingCurve::setSymbolExtent ( double extent )

Set the extent of the symbol.

The width of the symbol is given in scale coordinates. When painting a symbol the width is scaled into paint device coordinates by scaledSymbolWidth(). The scaled width is bounded by minSymbolWidth(), maxSymbolWidth()

Parameters

extent Symbol width in scale coordinates

See also: symbolExtent(), scaledSymbolWidth(), setMinSymbolWidth(), setMaxSymbolWidth()

◆ setSymbolPen() [1/2]

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

Build and assign the symbol 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()

◆ setSymbolPen() [2/2]

void QwtPlotTradingCurve::setSymbolPen ( const QPen & pen )

Set the symbol pen.

The symbol pen is used for rendering the lines of the bar or candlestick symbols

See also: symbolPen(), setSymbolBrush()

◆ setSymbolStyle()

void QwtPlotTradingCurve::setSymbolStyle ( SymbolStyle style )

Set the symbol style.

Parameters

style Symbol style

See also: symbolStyle(), setSymbolExtent(), setSymbolPen(), setSymbolBrush()

◆ symbolBrush()

QBrush QwtPlotTradingCurve::symbolBrush ( Direction direction ) const

Parameters

direction

Returns: Brush used to fill the body of all candlestick symbols with the direction

See also: setSymbolPen(), symbolBrush()

◆ symbolExtent()

double QwtPlotTradingCurve::symbolExtent ( ) const

Returns: Extent of a symbol in scale coordinates

See also: setSymbolExtent(), scaledSymbolWidth(), minSymbolWidth(), maxSymbolWidth()

◆ symbolPen()

QPen QwtPlotTradingCurve::symbolPen ( ) const

Returns: Symbol pen

See also: setSymbolPen(), symbolBrush()

◆ symbolStyle()

QwtPlotTradingCurve::SymbolStyle QwtPlotTradingCurve::symbolStyle ( ) const

Returns: Symbol style

See also: setSymbolStyle(), symbolExtent(), symbolPen(), symbolBrush()

◆ testPaintAttribute()

bool QwtPlotTradingCurve::testPaintAttribute ( PaintAttribute attribute ) const

Returns: True, when attribute is enabled

See also: PaintAttribute, setPaintAttribute()

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

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

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ Direction

◆ PaintAttribute

◆ SymbolStyle

Constructor & Destructor Documentation

◆ QwtPlotTradingCurve() [1/2]

◆ QwtPlotTradingCurve() [2/2]

Member Function Documentation

◆ boundingRect()

◆ drawBar()

◆ drawCandleStick()

◆ drawSeries()

◆ drawSymbols()

◆ drawUserSymbol()

◆ legendIcon()

◆ maxSymbolWidth()

◆ minSymbolWidth()

◆ rtti()

◆ scaledSymbolWidth()

◆ setMaxSymbolWidth()

◆ setMinSymbolWidth()

◆ setPaintAttribute()

◆ setSamples() [1/2]

◆ setSamples() [2/2]

◆ setSymbolBrush()

◆ setSymbolExtent()

◆ setSymbolPen() [1/2]

◆ setSymbolPen() [2/2]

◆ setSymbolStyle()

◆ symbolBrush()

◆ symbolExtent()

◆ symbolPen()

◆ symbolStyle()

◆ testPaintAttribute()