QCPGraph

Inheritance diagram for QCPGraph:

[legend]

Public Types
enum	LineStyle { lsNone , lsLine , lsStepLeft , lsStepRight , lsStepCenter , lsImpulse }

Public Types inherited from QObject
typedef	QObjectList

Public Member Functions
	QCPGraph (QCPAxis keyAxis, QCPAxis valueAxis)

bool	adaptiveSampling () const

void	addData (const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)

void	addData (double key, double value)

QCPGraph *	channelFillGraph () const

QSharedPointer< QCPGraphDataContainer >	data () const

virtual QCPRange	getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const override

virtual QCPRange	getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const override

LineStyle	lineStyle () const

int	scatterSkip () const

QCPScatterStyle	scatterStyle () const

virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override

void	setAdaptiveSampling (bool enabled)

void	setChannelFillGraph (QCPGraph *targetGraph)

void	setData (const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)

void	setData (QSharedPointer< QCPGraphDataContainer > data)

void	setLineStyle (LineStyle ls)

void	setScatterSkip (int skip)

void	setScatterStyle (const QCPScatterStyle &style)

Public Member Functions inherited from QCPAbstractPlottable1D< QCPGraphData >
	QCPAbstractPlottable1D (QCPAxis keyAxis, QCPAxis valueAxis)

virtual int	dataCount () const override

virtual double	dataMainKey (int index) const override

virtual double	dataMainValue (int index) const override

virtual QPointF	dataPixelPosition (int index) const override

virtual double	dataSortKey (int index) const override

virtual QCPRange	dataValueRange (int index) const override

virtual int	findBegin (double sortKey, bool expandedRange=true) const override

virtual int	findEnd (double sortKey, bool expandedRange=true) const override

virtual QCPPlottableInterface1D *	interface1D () override

virtual QCPDataSelection	selectTestRect (const QRectF &rect, bool onlySelectable) const override

virtual bool	sortKeyIsMainKey () const override

Public Member Functions inherited from QCPAbstractPlottable
	QCPAbstractPlottable (QCPAxis keyAxis, QCPAxis valueAxis)

bool	addToLegend ()

bool	addToLegend (QCPLegend *legend)

bool	antialiasedFill () const

bool	antialiasedScatters () const

QBrush	brush () const

const QPointF	coordsToPixels (double key, double value) const

void	coordsToPixels (double key, double value, double &x, double &y) const

QCPAxis *	keyAxis () const

QString	name () const

QPen	pen () const

void	pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const

void	pixelsToCoords (double x, double y, double &key, double &value) const

bool	removeFromLegend () const

bool	removeFromLegend (QCPLegend *legend) const

void	rescaleAxes (bool onlyEnlarge=false) const

void	rescaleKeyAxis (bool onlyEnlarge=false) const

void	rescaleValueAxis (bool onlyEnlarge=false, bool inKeyRange=false) const

QCP::SelectionType	selectable () const

bool	selected () const

QCPDataSelection	selection () const

QCPSelectionDecorator *	selectionDecorator () const

void	setAntialiasedFill (bool enabled)

void	setAntialiasedScatters (bool enabled)

void	setBrush (const QBrush &brush)

void	setKeyAxis (QCPAxis *axis)

void	setName (const QString &name)

void	setPen (const QPen &pen)

Q_SLOT void	setSelectable (QCP::SelectionType selectable)

Q_SLOT void	setSelection (QCPDataSelection selection)

void	setSelectionDecorator (QCPSelectionDecorator *decorator)

void	setValueAxis (QCPAxis *axis)

QCPAxis *	valueAxis () const

Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot plot, QString targetLayer=QString(), QCPLayerable parentLayerable=nullptr)

bool	antialiased () const

QCPLayer *	layer () const

QCPLayerable *	parentLayerable () const

QCustomPlot *	parentPlot () const

bool	realVisibility () const

void	setAntialiased (bool enabled)

bool	setLayer (const QString &layerName)

Q_SLOT bool	setLayer (QCPLayer *layer)

void	setVisible (bool on)

bool	visible () const

Public Member Functions inherited from QObject
	QObject (QObject *parent)

QBindable< QString >	bindableObjectName ()

bool	blockSignals (bool block)

const QObjectList &	children () const const

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type) const const

void	deleteLater ()

void	destroyed (QObject *obj)

bool	disconnect (const char signal, const QObject receiver, const char *method) const const

bool	disconnect (const QObject receiver, const char method) const const

void	dumpObjectInfo () const const

void	dumpObjectTree () const const

QList< QByteArray >	dynamicPropertyNames () const const

virtual bool	event (QEvent *e)

virtual bool	eventFilter (QObject watched, QEvent event)

T	findChild (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (Qt::FindChildOptions options) const const

bool	inherits (const char *className) const const

void	installEventFilter (QObject *filterObj)

bool	isQuickItemType () const const

bool	isWidgetType () const const

bool	isWindowType () const const

void	killTimer (int id)

virtual const QMetaObject *	metaObject () const const

void	moveToThread (QThread *targetThread)

QString	objectName () const const

void	objectNameChanged (const QString &objectName)

QObject *	parent () const const

QVariant	property (const char *name) const const

	Q_CLASSINFO (Name, Value)

	Q_EMIT Q_EMIT

	Q_ENUM (...)

	Q_ENUM_NS (...)

	Q_ENUMS (...)

	Q_FLAG (...)

	Q_FLAG_NS (...)

	Q_FLAGS (...)

	Q_GADGET Q_GADGET

	Q_GADGET_EXPORT (EXPORT_MACRO)

	Q_INTERFACES (...)

	Q_INVOKABLE Q_INVOKABLE

	Q_MOC_INCLUDE Q_MOC_INCLUDE

	Q_NAMESPACE Q_NAMESPACE

	Q_NAMESPACE_EXPORT (EXPORT_MACRO)

	Q_OBJECT Q_OBJECT

	Q_PROPERTY (...)

	Q_REVISION Q_REVISION

	Q_SET_OBJECT_NAME (Object)

	Q_SIGNAL Q_SIGNAL

	Q_SIGNALS Q_SIGNALS

	Q_SLOT Q_SLOT

	Q_SLOTS Q_SLOTS

T	qobject_cast (const QObject *object)

T	qobject_cast (QObject *object)

	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setObjectName (QAnyStringView name)

void	setParent (QObject *parent)

bool	setProperty (const char *name, const QVariant &value)

bool	setProperty (const char *name, QVariant &&value)

bool	signalsBlocked () const const

int	startTimer (int interval, Qt::TimerType timerType)

int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)

QThread *	thread () const const

Public Member Functions inherited from QCPPlottableInterface1D

Protected Member Functions
QVector< QPointF >	dataToImpulseLines (const QVector< QCPGraphData > &data) const

QVector< QPointF >	dataToLines (const QVector< QCPGraphData > &data) const

QVector< QPointF >	dataToStepCenterLines (const QVector< QCPGraphData > &data) const

QVector< QPointF >	dataToStepLeftLines (const QVector< QCPGraphData > &data) const

QVector< QPointF >	dataToStepRightLines (const QVector< QCPGraphData > &data) const

virtual void	draw (QCPPainter *painter) override

virtual void	drawFill (QCPPainter painter, QVector< QPointF > lines) const

virtual void	drawImpulsePlot (QCPPainter *painter, const QVector< QPointF > &lines) const

virtual void	drawLegendIcon (QCPPainter *painter, const QRectF &rect) const override

virtual void	drawLinePlot (QCPPainter *painter, const QVector< QPointF > &lines) const

virtual void	drawScatterPlot (QCPPainter *painter, const QVector< QPointF > &scatters, const QCPScatterStyle &style) const

int	findIndexAboveX (const QVector< QPointF > *data, double x) const

int	findIndexAboveY (const QVector< QPointF > *data, double y) const

int	findIndexBelowX (const QVector< QPointF > *data, double x) const

int	findIndexBelowY (const QVector< QPointF > *data, double y) const

const QPolygonF	getChannelFillPolygon (const QVector< QPointF > thisData, QCPDataRange thisSegment, const QVector< QPointF > otherData, QCPDataRange otherSegment) const

QPointF	getFillBasePoint (QPointF matchingDataPoint) const

const QPolygonF	getFillPolygon (const QVector< QPointF > *lineData, QCPDataRange segment) const

void	getLines (QVector< QPointF > *lines, const QCPDataRange &dataRange) const

QVector< QCPDataRange >	getNonNanSegments (const QVector< QPointF > *lineData, Qt::Orientation keyOrientation) const

virtual void	getOptimizedLineData (QVector< QCPGraphData > *lineData, const QCPGraphDataContainer::const_iterator &begin, const QCPGraphDataContainer::const_iterator &end) const

virtual void	getOptimizedScatterData (QVector< QCPGraphData > *scatterData, QCPGraphDataContainer::const_iterator begin, QCPGraphDataContainer::const_iterator end) const

QVector< QPair< QCPDataRange, QCPDataRange > >	getOverlappingSegments (QVector< QCPDataRange > thisSegments, const QVector< QPointF > thisData, QVector< QCPDataRange > otherSegments, const QVector< QPointF > otherData) const

void	getScatters (QVector< QPointF > *scatters, const QCPDataRange &dataRange) const

void	getVisibleDataBounds (QCPGraphDataContainer::const_iterator &begin, QCPGraphDataContainer::const_iterator &end, const QCPDataRange &rangeRestriction) const

double	pointDistance (const QPointF &pixelPoint, QCPGraphDataContainer::const_iterator &closestData) const

bool	segmentsIntersect (double aLower, double aUpper, double bLower, double bUpper, int &bPrecedence) const

Protected Member Functions inherited from QCPAbstractPlottable1D< QCPGraphData >
void	drawPolyline (QCPPainter *painter, const QVector< QPointF > &lineData) const

void	getDataSegments (QList< QCPDataRange > &selectedSegments, QList< QCPDataRange > &unselectedSegments) const

Protected Member Functions inherited from QCPAbstractPlottable
void	applyDefaultAntialiasingHint (QCPPainter *painter) const override

void	applyFillAntialiasingHint (QCPPainter *painter) const

void	applyScattersAntialiasingHint (QCPPainter *painter) const

virtual QRect	clipRect () const override

virtual void	deselectEvent (bool *selectionStateChanged) override

virtual void	selectEvent (QMouseEvent event, bool additive, const QVariant &details, bool selectionStateChanged) override

virtual QCP::Interaction	selectionCategory () const override

Protected Member Functions inherited from QCPLayerable
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

void	initializeParentPlot (QCustomPlot *parentPlot)

virtual void	mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)

virtual void	mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)

virtual void	mousePressEvent (QMouseEvent *event, const QVariant &details)

virtual void	mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)

bool	moveToLayer (QCPLayer *layer, bool prepend)

virtual void	parentPlotInitialized (QCustomPlot *parentPlot)

void	setParentLayerable (QCPLayerable *parentLayerable)

virtual void	wheelEvent (QWheelEvent *event)

Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signal)

bool	isSignalConnected (const QMetaMethod &signal) const const

int	receivers (const char *signal) const const

QObject *	sender () const const

int	senderSignalIndex () const const

virtual void	timerEvent (QTimerEvent *event)

Protected Attributes
bool	mAdaptiveSampling

QPointer< QCPGraph >	mChannelFillGraph

LineStyle	mLineStyle

int	mScatterSkip

QCPScatterStyle	mScatterStyle

Protected Attributes inherited from QCPAbstractPlottable1D< QCPGraphData >
QSharedPointer< QCPDataContainer< QCPGraphData > >	mDataContainer

Protected Attributes inherited from QCPAbstractPlottable
bool	mAntialiasedFill

bool	mAntialiasedScatters

QBrush	mBrush

QPointer< QCPAxis >	mKeyAxis

QString	mName

QPen	mPen

QCP::SelectionType	mSelectable

QCPDataSelection	mSelection

QCPSelectionDecorator *	mSelectionDecorator

QPointer< QCPAxis >	mValueAxis

Protected Attributes inherited from QCPLayerable
bool	mAntialiased

QCPLayer *	mLayer

QPointer< QCPLayerable >	mParentLayerable

QCustomPlot *	mParentPlot

bool	mVisible

Additional Inherited Members
Properties inherited from QObject
	objectName

Signals inherited from QCPAbstractPlottable
void	selectableChanged (QCP::SelectionType selectable)

void	selectionChanged (bool selected)

void	selectionChanged (const QCPDataSelection &selection)

Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)

Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject context, Functor functor, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)

bool	disconnect (const QMetaObject::Connection &connection)

bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)

bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method)

bool	disconnect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method)

QString	tr (const char sourceText, const char disambiguation, int n)

Detailed Description

A plottable representing a graph in a plot.

Usually you create new graphs by calling QCustomPlot::addGraph. The resulting instance can be accessed via QCustomPlot::graph.

To plot data, assign it with the setData or addData functions. Alternatively, you can also access and modify the data via the data method, which returns a pointer to the internal QCPGraphDataContainer.

Graphs are used to display single-valued data. Single-valued means that there should only be one data point per unique key coordinate. In other words, the graph can't have loops. If you do want to plot non-single-valued curves, rather use the QCPCurve plottable.

Gaps in the graph line can be created by adding data points with NaN as value (qQNaN() or std::numeric_limits<double>::quiet_NaN()) in between the two data points that shall be separated.

Changing the appearance

The appearance of the graph is mainly determined by the line style, scatter style, brush and pen of the graph (setLineStyle, setScatterStyle, setBrush, setPen).

Filling under or between graphs

QCPGraph knows two types of fills: Normal graph fills towards the zero-value-line parallel to the key axis of the graph, and fills between two graphs, called channel fills. To enable a fill, just set a brush with setBrush which is neither Qt::NoBrush nor fully transparent.

By default, a normal fill towards the zero-value-line will be drawn. To set up a channel fill between this graph and another one, call setChannelFillGraph with the other graph as parameter.

See also: QCustomPlot::addGraph, QCustomPlot::graph

Definition at line 5494 of file qcustomplot.h.

Member Enumeration Documentation

◆ LineStyle

enum QCPGraph::LineStyle

Defines how the graph's line is represented visually in the plot. The line is drawn with the current pen of the graph (setPen).

See also: setLineStyle

Enumerator
lsNone	data points are not connected with any lines (e.g. data only represented with symbols according to the scatter style, see setScatterStyle)
lsLine	data points are connected by a straight line
lsStepLeft	line is drawn as steps where the step height is the value of the left data point
lsStepRight	line is drawn as steps where the step height is the value of the right data point
lsStepCenter	line is drawn as steps where the step is in between two data points
lsImpulse	each data point is represented by a line parallel to the value axis, which reaches from the data point to the zero-value-line

Definition at line 5510 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPGraph()

QCPGraph::QCPGraph	(	QCPAxis *	keyAxis,
		QCPAxis *	valueAxis )

explicit

Constructs a graph which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y"). keyAxis and valueAxis must reside in the same QCustomPlot instance and not have the same orientation. If either of these restrictions is violated, a corresponding message is printed to the debug output (qDebug), the construction is not aborted, though.

The created QCPGraph is automatically registered with the QCustomPlot instance inferred from keyAxis. This QCustomPlot instance takes ownership of the QCPGraph, so do not delete it manually but use QCustomPlot::removePlottable() instead.

To directly create a graph inside a plot, you can also use the simpler QCustomPlot::addGraph function.

Definition at line 20881 of file qcustomplot.cpp.

◆ ~QCPGraph()

QCPGraph::~QCPGraph ( )

overridevirtual

Definition at line 20899 of file qcustomplot.cpp.

Member Function Documentation

◆ adaptiveSampling()

bool QCPGraph::adaptiveSampling ( ) const

inline

Definition at line 5529 of file qcustomplot.h.

◆ addData() [1/2]

void QCPGraph::addData	(	const QVector< double > &	keys,
		const QVector< double > &	values,
		bool	alreadySorted = false )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Adds the provided points in keys and values to the current data. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

If you can guarantee that the passed data points are sorted by keys in ascending order, you can set alreadySorted to true, to improve performance by saving a sorting run.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 21055 of file qcustomplot.cpp.

◆ addData() [2/2]

void QCPGraph::addData	(	double	key,
		double	value )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Adds the provided data point as key and value to the current data.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 21081 of file qcustomplot.cpp.

◆ channelFillGraph()

QCPGraph * QCPGraph::channelFillGraph ( ) const

inline

Definition at line 5528 of file qcustomplot.h.

◆ data()

QSharedPointer< QCPGraphDataContainer > QCPGraph::data ( ) const

inline

Returns a shared pointer to the internal data storage of type QCPGraphDataContainer. You may use it to directly manipulate the data, which may be more convenient and faster than using the regular setData or addData methods.

Definition at line 5524 of file qcustomplot.h.

◆ dataToImpulseLines()

QVector< QPointF > QCPGraph::dataToImpulseLines ( const QVector< QCPGraphData > & data ) const

protected

Takes raw data points in plot coordinates as data, and returns a vector containing pixel coordinate points which are suitable for drawing the line style lsImpulse.

The source of data is usually getOptimizedLineData, and this method is called in getLines if the line style is set accordingly.

See also: dataToLines, dataToStepLeftLines, dataToStepRightLines, dataToStepCenterLines, getLines, drawImpulsePlot

Definition at line 21540 of file qcustomplot.cpp.

◆ dataToLines()

QVector< QPointF > QCPGraph::dataToLines ( const QVector< QCPGraphData > & data ) const

protected

Takes raw data points in plot coordinates as data, and returns a vector containing pixel coordinate points which are suitable for drawing the line style lsLine.

The source of data is usually getOptimizedLineData, and this method is called in getLines if the line style is set accordingly.

See also: dataToStepLeftLines, dataToStepRightLines, dataToStepCenterLines, dataToImpulseLines, getLines, drawLinePlot

Definition at line 21346 of file qcustomplot.cpp.

◆ dataToStepCenterLines()

QVector< QPointF > QCPGraph::dataToStepCenterLines ( const QVector< QCPGraphData > & data ) const

protected

Takes raw data points in plot coordinates as data, and returns a vector containing pixel coordinate points which are suitable for drawing the line style lsStepCenter.

The source of data is usually getOptimizedLineData, and this method is called in getLines if the line style is set accordingly.

See also: dataToLines, dataToStepLeftLines, dataToStepRightLines, dataToImpulseLines, getLines, drawLinePlot

Definition at line 21480 of file qcustomplot.cpp.

◆ dataToStepLeftLines()

QVector< QPointF > QCPGraph::dataToStepLeftLines ( const QVector< QCPGraphData > & data ) const

protected

Takes raw data points in plot coordinates as data, and returns a vector containing pixel coordinate points which are suitable for drawing the line style lsStepLeft.

The source of data is usually getOptimizedLineData, and this method is called in getLines if the line style is set accordingly.

See also: dataToLines, dataToStepRightLines, dataToStepCenterLines, dataToImpulseLines, getLines, drawLinePlot

Definition at line 21384 of file qcustomplot.cpp.

◆ dataToStepRightLines()

QVector< QPointF > QCPGraph::dataToStepRightLines ( const QVector< QCPGraphData > & data ) const

protected

Takes raw data points in plot coordinates as data, and returns a vector containing pixel coordinate points which are suitable for drawing the line style lsStepRight.

The source of data is usually getOptimizedLineData, and this method is called in getLines if the line style is set accordingly.

See also: dataToLines, dataToStepLeftLines, dataToStepCenterLines, dataToImpulseLines, getLines, drawLinePlot

Definition at line 21432 of file qcustomplot.cpp.

◆ draw()

void QCPGraph::draw ( QCPPainter * painter )

overrideprotectedvirtual

This function draws the layerable with the specified painter. It is only called by QCustomPlot, if the layerable is visible (setVisible).

Before this function is called, the painter's antialiasing state is set via applyDefaultAntialiasingHint, see the documentation there. Further, the clipping rectangle was set to clipRect.

Implements QCPAbstractPlottable.

Definition at line 21128 of file qcustomplot.cpp.

◆ drawFill()

void QCPGraph::drawFill	(	QCPPainter *	painter,
		QVector< QPointF > *	lines ) const

protectedvirtual

Draws the fill of the graph using the specified painter, with the currently set brush.

Depending on whether a normal fill or a channel fill (setChannelFillGraph) is needed, getFillPolygon or getChannelFillPolygon are used to find the according fill polygons.

In order to handle NaN Data points correctly (the fill needs to be split into disjoint areas), this method first determines a list of non-NaN segments with getNonNanSegments, on which to operate. In the channel fill case, getOverlappingSegments is used to consolidate the non-NaN segments of the two involved graphs, before passing the overlapping pairs to getChannelFillPolygon.

Pass the points of this graph's line as lines, in pixel coordinates.

See also: drawLinePlot, drawImpulsePlot, drawScatterPlot

Definition at line 21607 of file qcustomplot.cpp.

◆ drawImpulsePlot()

void QCPGraph::drawImpulsePlot	(	QCPPainter *	painter,
		const QVector< QPointF > &	lines ) const

protectedvirtual

Draws impulses from the provided data, i.e. it connects all line pairs in lines, given in pixel coordinates. The lines necessary for impulses are generated by dataToImpulseLines from the regular graph data points.

See also: drawLinePlot, drawScatterPlot

Definition at line 21672 of file qcustomplot.cpp.

◆ drawLegendIcon()

void QCPGraph::drawLegendIcon	(	QCPPainter *	painter,
		const QRectF &	rect ) const

overrideprotectedvirtual

called by QCPLegend::draw (via QCPPlottableLegendItem::draw) to create a graphical representation of this plottable inside rect, next to the plottable name.

The passed painter has its cliprect set to rect, so painting outside of rect won't appear outside the legend icon border.

Implements QCPAbstractPlottable.

Definition at line 21196 of file qcustomplot.cpp.

◆ drawLinePlot()

void QCPGraph::drawLinePlot	(	QCPPainter *	painter,
		const QVector< QPointF > &	lines ) const

protectedvirtual

Draws lines between the points in lines, given in pixel coordinates.

See also: drawScatterPlot, drawImpulsePlot, QCPAbstractPlottable1D::drawPolyline

Definition at line 21655 of file qcustomplot.cpp.

◆ drawScatterPlot()

void QCPGraph::drawScatterPlot	(	QCPPainter *	painter,
		const QVector< QPointF > &	scatters,
		const QCPScatterStyle &	style ) const

protectedvirtual

Draws scatter symbols at every point passed in scatters, given in pixel coordinates. The scatters will be drawn with painter and have the appearance as specified in style.

See also: drawLinePlot, drawImpulsePlot

Definition at line 21641 of file qcustomplot.cpp.

◆ findIndexAboveX()

int QCPGraph::findIndexAboveX	(	const QVector< QPointF > *	data,
		double	x ) const

protected

Finds the smallest index of data, whose points x value is just above x. Assumes x values in data points are ordered ascending, as is ensured by getLines/ getScatters if the key axis is horizontal.

Used to calculate the channel fill polygon, see getChannelFillPolygon.

Definition at line 22352 of file qcustomplot.cpp.

◆ findIndexAboveY()

int QCPGraph::findIndexAboveY	(	const QVector< QPointF > *	data,
		double	y ) const

protected

Finds the smallest index of data, whose points y value is just above y. Assumes y values in data points are ordered ascending, as is ensured by getLines/ getScatters if the key axis is vertical.

Used to calculate the channel fill polygon, see getChannelFillPolygon.

Definition at line 22398 of file qcustomplot.cpp.

◆ findIndexBelowX()

int QCPGraph::findIndexBelowX	(	const QVector< QPointF > *	data,
		double	x ) const

protected

Finds the highest index of data, whose points x value is just below x. Assumes x values in data points are ordered ascending, as is ensured by getLines/ getScatters if the key axis is horizontal.

Used to calculate the channel fill polygon, see getChannelFillPolygon.

Definition at line 22375 of file qcustomplot.cpp.

◆ findIndexBelowY()

int QCPGraph::findIndexBelowY	(	const QVector< QPointF > *	data,
		double	y ) const

protected

Finds the highest index of data, whose points y value is just below y. Assumes y values in data points are ordered ascending, as is ensured by getLines/ getScatters if the key axis is vertical.

Used to calculate the channel fill polygon, see getChannelFillPolygon.

Definition at line 22480 of file qcustomplot.cpp.

◆ getChannelFillPolygon()

const QPolygonF QCPGraph::getChannelFillPolygon	(	const QVector< QPointF > *	thisData,
		QCPDataRange	thisSegment,
		const QVector< QPointF > *	otherData,
		QCPDataRange	otherSegment ) const

protected

Returns the polygon needed for drawing (partial) channel fills between this graph and the graph specified by setChannelFillGraph.

The data points of this graph are passed as pixel coordinates via thisData, the data of the other graph as otherData. The returned polygon will be calculated for the specified data segments thisSegment and otherSegment, pertaining to the respective thisData and otherData, respectively.

The passed thisSegment and otherSegment should correspond to the segment pairs returned by getOverlappingSegments, to make sure only segments that actually have key coordinate overlap need to be processed here.

For increased performance due to implicit sharing, keep the returned QPolygonF const.

See also: drawFill, getOverlappingSegments, getNonNanSegments

Definition at line 22245 of file qcustomplot.cpp.

◆ getFillBasePoint()

QPointF QCPGraph::getFillBasePoint ( QPointF matchingDataPoint ) const

protected

Returns the point which closes the fill polygon on the zero-value-line parallel to the key axis. The logarithmic axis scale case is a bit special, since the zero-value-line in pixel coordinates is in positive or negative infinity. So this case is handled separately by just closing the fill polygon on the axis which lies in the direction towards the zero value.

matchingDataPoint will provide the key (in pixels) of the returned point. Depending on whether the key axis of this graph is horizontal or vertical, matchingDataPoint will provide the x or y value of the returned point, respectively.

Definition at line 22155 of file qcustomplot.cpp.

◆ getFillPolygon()

const QPolygonF QCPGraph::getFillPolygon	(	const QVector< QPointF > *	lineData,
		QCPDataRange	segment ) const

protected

Returns the polygon needed for drawing normal fills between this graph and the key axis.

Pass the graph's data points (in pixel coordinates) as lineData, and specify the segment which shall be used for the fill. The collection of lineData points described by segment must not contain NaN data points (see getNonNanSegments).

The returned fill polygon will be closed at the key axis (the zero-value line) for linear value axes. For logarithmic value axes the polygon will reach just beyond the corresponding axis rect side (see getFillBasePoint).

For increased performance (due to implicit sharing), keep the returned QPolygonF const.

See also: drawFill, getNonNanSegments

Definition at line 22214 of file qcustomplot.cpp.

◆ getKeyRange()

QCPRange QCPGraph::getKeyRange	(	bool &	foundRange,
		QCP::SignDomain	inSignDomain = QCP::sdBoth ) const

overridevirtual

Returns the coordinate range that all data in this plottable span in the key axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

Note that foundRange is not the same as QCPRange::validRange, since the range returned by this function may have size zero (e.g. when there is only one data point). In this case foundRange would return true, but the returned range is not a valid range in terms of QCPRange::validRange.

See also: rescaleAxes, getValueRange

Implements QCPAbstractPlottable.

Definition at line 21116 of file qcustomplot.cpp.

◆ getLines()

void QCPGraph::getLines	(	QVector< QPointF > *	lines,
		const QCPDataRange &	dataRange ) const

protected

This method retrieves an optimized set of data points via getOptimizedLineData, and branches out to the line style specific functions such as dataToLines, dataToStepLeftLines, etc. according to the line style of the graph.

lines will be filled with points in pixel coordinates, that can be drawn with the according draw functions like drawLinePlot and drawImpulsePlot. The points returned in lines aren't necessarily the original data points. For example, step line styles require additional points to form the steps when drawn. If the line style of the graph is lsNone, the lines vector will be empty.

dataRange specifies the beginning and ending data indices that will be taken into account for conversion. In this function, the specified range may exceed the total data bounds without harm: a correspondingly trimmed data range will be used. This takes the burden off the user of this function to check for valid indices in dataRange, e.g. when extending ranges coming from getDataSegments.

See also: getScatters

Definition at line 21250 of file qcustomplot.cpp.

◆ getNonNanSegments()

QVector< QCPDataRange > QCPGraph::getNonNanSegments	(	const QVector< QPointF > *	lineData,
		Qt::Orientation	keyOrientation ) const

protected

This method goes through the passed points in lineData and returns a list of the segments which don't contain NaN data points.

keyOrientation defines whether the x or y member of the passed QPointF is used to check for NaN. If keyOrientation is Qt::Horizontal, the y member is checked, if it is Qt::Vertical, the x member is checked.

See also: getOverlappingSegments, drawFill

Definition at line 22001 of file qcustomplot.cpp.

◆ getOptimizedLineData()

void QCPGraph::getOptimizedLineData	(	QVector< QCPGraphData > *	lineData,
		const QCPGraphDataContainer::const_iterator &	begin,
		const QCPGraphDataContainer::const_iterator &	end ) const

protectedvirtual

Returns via lineData the data points that need to be visualized for this graph when plotting graph lines, taking into consideration the currently visible axis ranges and, if setAdaptiveSampling is enabled, local point densities. The considered data can be restricted further by begin and end, e.g. to only plot a certain segment of the data (see getDataSegments).

This method is used by getLines to retrieve the basic working set of data.

See also: getOptimizedScatterData

Definition at line 21698 of file qcustomplot.cpp.

◆ getOptimizedScatterData()

void QCPGraph::getOptimizedScatterData	(	QVector< QCPGraphData > *	scatterData,
		QCPGraphDataContainer::const_iterator	begin,
		QCPGraphDataContainer::const_iterator	end ) const

protectedvirtual

Returns via scatterData the data points that need to be visualized for this graph when plotting scatter points, taking into consideration the currently visible axis ranges and, if setAdaptiveSampling is enabled, local point densities. The considered data can be restricted further by begin and end, e.g. to only plot a certain segment of the data (see getDataSegments).

This method is used by getScatters to retrieve the basic working set of data.

See also: getOptimizedLineData

Definition at line 21790 of file qcustomplot.cpp.

◆ getOverlappingSegments()

QVector< QPair< QCPDataRange, QCPDataRange > > QCPGraph::getOverlappingSegments	(	QVector< QCPDataRange >	thisSegments,
		const QVector< QPointF > *	thisData,
		QVector< QCPDataRange >	otherSegments,
		const QVector< QPointF > *	otherData ) const

protected

This method takes two segment lists (e.g. created by getNonNanSegments) thisSegments and otherSegments, and their associated point data thisData and otherData.

It returns all pairs of segments (the first from thisSegments, the second from otherSegments), which overlap in plot coordinates.

This method is useful in the case of a channel fill between two graphs, when only those non-NaN segments which actually overlap in their key coordinate shall be considered for drawing a channel fill polygon.

It is assumed that the passed segments in thisSegments are ordered ascending by index, and that the segments don't overlap themselves. The same is assumed for the segments in otherSegments. This is fulfilled when the segments are obtained via getNonNanSegments.

See also: getNonNanSegments, segmentsIntersect, drawFill, getChannelFillPolygon

Definition at line 22059 of file qcustomplot.cpp.

◆ getScatters()

void QCPGraph::getScatters	(	QVector< QPointF > *	scatters,
		const QCPDataRange &	dataRange ) const

protected

This method retrieves an optimized set of data points via getOptimizedScatterData and then converts them to pixel coordinates. The resulting points are returned in scatters, and can be passed to drawScatterPlot.

Definition at line 21291 of file qcustomplot.cpp.

◆ getValueRange()

QCPRange QCPGraph::getValueRange	(	bool &	foundRange,
		QCP::SignDomain	inSignDomain = QCP::sdBoth,
		const QCPRange &	inKeyRange = QCPRange() ) const

overridevirtual

Returns the coordinate range that the data points in the specified key range (inKeyRange) span in the value axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

If inKeyRange has both lower and upper bound set to zero (is equal to QCPRange()), all data points are considered, without any restriction on the keys.

See also: rescaleAxes, getKeyRange

Implements QCPAbstractPlottable.

Definition at line 21122 of file qcustomplot.cpp.

◆ getVisibleDataBounds()

void QCPGraph::getVisibleDataBounds	(	QCPGraphDataContainer::const_iterator &	begin,
		QCPGraphDataContainer::const_iterator &	end,
		const QCPDataRange &	rangeRestriction ) const

protected

This method outputs the currently visible data range via begin and end. The returned range will also never exceed rangeRestriction.

This method takes into account that the drawing of data lines at the axis rect border always requires the points just outside the visible axis range. So begin and end may actually indicate a range that contains one additional data point to the left and right of the visible axis range.

Definition at line 21971 of file qcustomplot.cpp.

◆ lineStyle()

LineStyle QCPGraph::lineStyle ( ) const

inline

Definition at line 5525 of file qcustomplot.h.

◆ pointDistance()

double QCPGraph::pointDistance	(	const QPointF &	pixelPoint,
		QCPGraphDataContainer::const_iterator &	closestData ) const

protected

Calculates the minimum distance in pixels the graph's representation has from the given pixelPoint. This is used to determine whether the graph was clicked or not, e.g. in selectTest. The closest data point to pixelPoint is returned in closestData. Note that if the graph has a line representation, the returned distance may be smaller than the distance to the closestData point, since the distance to the graph line is also taken into account.

If either the graph has no data or if the line style is lsNone and the scatter style's shape is QCPScatterStyle::ssNone (i.e. there is no visual representation of the graph), returns -1.0.

Definition at line 22424 of file qcustomplot.cpp.

◆ scatterSkip()

int QCPGraph::scatterSkip ( ) const

inline

Definition at line 5527 of file qcustomplot.h.

◆ scatterStyle()

QCPScatterStyle QCPGraph::scatterStyle ( ) const

inline

Definition at line 5526 of file qcustomplot.h.

◆ segmentsIntersect()

bool QCPGraph::segmentsIntersect	(	double	aLower,
		double	aUpper,
		double	bLower,
		double	bUpper,
		int &	bPrecedence ) const

protected

Returns whether the segments defined by the coordinates (aLower, aUpper) and (bLower, bUpper) have overlap.

The output parameter bPrecedence indicates whether the b segment reaches farther than the a segment or not. If bPrecedence returns 1, segment b reaches the farthest to higher coordinates (i.e. bUpper > aUpper). If it returns -1, segment a reaches the farthest. Only if both segment's upper bounds are identical, 0 is returned as bPrecedence.

It is assumed that the lower bounds always have smaller or equal values than the upper bounds.

See also: getOverlappingSegments

Definition at line 22122 of file qcustomplot.cpp.

◆ selectTest()

double QCPGraph::selectTest	(	const QPointF &	pos,
		bool	onlySelectable,
		QVariant *	details = nullptr ) const

overridevirtual

Implements a selectTest specific to this plottable's point geometry.

If details is not 0, it will be set to a QCPDataSelection, describing the closest data point to pos.

\seebaseclassmethod QCPAbstractPlottable::selectTest

Reimplemented from QCPAbstractPlottable1D< QCPGraphData >.

Definition at line 21094 of file qcustomplot.cpp.

◆ setAdaptiveSampling()

void QCPGraph::setAdaptiveSampling ( bool enabled )

Sets whether adaptive sampling shall be used when plotting this graph. QCustomPlot's adaptive sampling technique can drastically improve the replot performance for graphs with a larger number of points (e.g. above 10,000), without notably changing the appearance of the graph.

By default, adaptive sampling is enabled. Even if enabled, QCustomPlot decides whether adaptive sampling shall actually be used on a per-graph basis. So leaving adaptive sampling enabled has no disadvantage in almost all cases.

A line plot of 500,000 points without and with adaptive sampling

As can be seen, line plots experience no visual degradation from adaptive sampling. Outliers are reproduced reliably, as well as the overall shape of the data set. The replot time reduces dramatically though. This allows QCustomPlot to display large amounts of data in realtime.

A scatter plot of 100,000 points without and with adaptive sampling

Care must be taken when using high-density scatter plots in combination with adaptive sampling. The adaptive sampling algorithm treats scatter plots more carefully than line plots which still gives a significant reduction of replot times, but not quite as much as for line plots. This is because scatter plots inherently need more data points to be preserved in order to still resemble the original, non-adaptive-sampling plot. As shown above, the results still aren't quite identical, as banding occurs for the outer data points. This is in fact intentional, such that the boundaries of the data cloud stay visible to the viewer. How strong the banding appears, depends on the point density, i.e. the number of points in the plot.

For some situations with scatter plots it might thus be desirable to manually turn adaptive sampling off. For example, when saving the plot to disk. This can be achieved by setting enabled to false before issuing a command like QCustomPlot::savePng, and setting enabled back to true afterwards.

Definition at line 21038 of file qcustomplot.cpp.

◆ setChannelFillGraph()

void QCPGraph::setChannelFillGraph ( QCPGraph * targetGraph )

Sets the target graph for filling the area between this graph and targetGraph with the current brush (setBrush).

When targetGraph is set to 0, a normal graph fill to the zero-value-line will be shown. To disable any filling, set the brush to Qt::NoBrush.

See also: setBrush

Definition at line 20987 of file qcustomplot.cpp.

◆ setData() [1/2]

void QCPGraph::setData	(	const QVector< double > &	keys,
		const QVector< double > &	values,
		bool	alreadySorted = false )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data with the provided points in keys and values. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

If you can guarantee that the passed data points are sorted by keys in ascending order, you can set alreadySorted to true, to improve performance by saving a sorting run.

See also: addData

Definition at line 20934 of file qcustomplot.cpp.

◆ setData() [2/2]

void QCPGraph::setData ( QSharedPointer< QCPGraphDataContainer > data )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data container with the provided data container.

Since a QSharedPointer is used, multiple QCPGraphs may share the same data container safely. Modifying the data in the container will then affect all graphs that share the container. Sharing can be achieved by simply exchanging the data containers wrapped in shared pointers:

If you do not wish to share containers, but create a copy from an existing container, rather use the QCPDataContainer<DataType>::set method on the graph's data container directly:

See also: addData

Definition at line 20918 of file qcustomplot.cpp.

◆ setLineStyle()

void QCPGraph::setLineStyle ( LineStyle ls )

Sets how the single data points are connected in the plot. For scatter-only plots, set ls to lsNone and setScatterStyle to the desired scatter style.

See also: setScatterStyle

Definition at line 20946 of file qcustomplot.cpp.

◆ setScatterSkip()

void QCPGraph::setScatterSkip ( int skip )

If scatters are displayed (scatter style not QCPScatterStyle::ssNone), skip number of scatter points are skipped/not drawn after every drawn scatter point.

This can be used to make the data appear sparser while for example still having a smooth line, and to improve performance for very high density plots.

If skip is set to 0 (default), all scatter points are drawn.

See also: setScatterStyle

Definition at line 20973 of file qcustomplot.cpp.

◆ setScatterStyle()

void QCPGraph::setScatterStyle ( const QCPScatterStyle & style )

Sets the visual appearance of single data points in the plot. If set to QCPScatterStyle::ssNone, no scatter points are drawn (e.g. for line-only-plots with appropriate line style).

See also: QCPScatterStyle, setLineStyle

Definition at line 20957 of file qcustomplot.cpp.

Member Data Documentation

◆ mAdaptiveSampling

bool QCPGraph::mAdaptiveSampling

protected

Definition at line 5555 of file qcustomplot.h.

◆ mChannelFillGraph

QPointer<QCPGraph> QCPGraph::mChannelFillGraph

protected

Definition at line 5554 of file qcustomplot.h.

◆ mLineStyle

LineStyle QCPGraph::mLineStyle

protected

Definition at line 5551 of file qcustomplot.h.

◆ mScatterSkip

int QCPGraph::mScatterSkip

protected

Definition at line 5553 of file qcustomplot.h.

◆ mScatterStyle

QCPScatterStyle QCPGraph::mScatterStyle

protected

Definition at line 5552 of file qcustomplot.h.

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

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QCPGraph

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Changing the appearance

Filling under or between graphs

Member Enumeration Documentation

◆ LineStyle

Constructor & Destructor Documentation

◆ QCPGraph()

◆ ~QCPGraph()

Member Function Documentation

◆ adaptiveSampling()

◆ addData() [1/2]

◆ addData() [2/2]

◆ channelFillGraph()

◆ data()

◆ dataToImpulseLines()

◆ dataToLines()

◆ dataToStepCenterLines()

◆ dataToStepLeftLines()

◆ dataToStepRightLines()

◆ draw()

◆ drawFill()

◆ drawImpulsePlot()

◆ drawLegendIcon()

◆ drawLinePlot()

◆ drawScatterPlot()

◆ findIndexAboveX()

◆ findIndexAboveY()

◆ findIndexBelowX()

◆ findIndexBelowY()

◆ getChannelFillPolygon()

◆ getFillBasePoint()

◆ getFillPolygon()

◆ getKeyRange()

◆ getLines()

◆ getNonNanSegments()

◆ getOptimizedLineData()

◆ getOptimizedScatterData()

◆ getOverlappingSegments()

◆ getScatters()

◆ getValueRange()

◆ getVisibleDataBounds()

◆ lineStyle()

◆ pointDistance()

◆ scatterSkip()

◆ scatterStyle()

◆ segmentsIntersect()

◆ selectTest()

◆ setAdaptiveSampling()

◆ setChannelFillGraph()

◆ setData() [1/2]

◆ setData() [2/2]

◆ setLineStyle()

◆ setScatterSkip()

◆ setScatterStyle()

Member Data Documentation

◆ mAdaptiveSampling

◆ mChannelFillGraph

◆ mLineStyle

◆ mScatterSkip

◆ mScatterStyle