QCPCurve Class Reference

A plottable representing a parametric curve in a plot. More...

Inheritance diagram for QCPCurve:

Public Types
enum	LineStyle { lsNone , lsLine }
	Defines how the curve's line is represented visually in the plot. More...

Public Member Functions
	QCPCurve (QCPAxis *keyAxis, QCPAxis *valueAxis)
	Constructs a curve which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y").
QSharedPointer< QCPCurveDataContainer >	data () const
	Returns a shared pointer to the internal data storage of type QCPCurveDataContainer.
QCPScatterStyle	scatterStyle () const
int	scatterSkip () const
LineStyle	lineStyle () const
void	setData (QSharedPointer< QCPCurveDataContainer > 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.
void	setData (const QVector< double > &t, 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 t, keys and values.
void	setData (const QVector< double > &keys, const QVector< double > &values)
	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.
void	setScatterStyle (const QCPScatterStyle &style)
	Sets the visual appearance of single data points in the plot.
void	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.
void	setLineStyle (LineStyle style)
	Sets how the single data points are connected in the plot or how they are represented visually apart from the scatter symbol.
void	addData (const QVector< double > &t, 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 t, keys and values to the current data.
void	addData (const QVector< double > &keys, const QVector< double > &values)
	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.
void	addData (double t, 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 t, key and value to the current data.
void	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.
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const Q_DECL_OVERRIDE
	Implements a point-selection algorithm assuming the data (accessed via the 1D data interface) is point-like.
virtual QCPRange	getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const Q_DECL_OVERRIDE
	Returns the coordinate range that all data in this plottable span in the key axis dimension.
virtual QCPRange	getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const Q_DECL_OVERRIDE
	Returns the coordinate range that the data points in the specified key range (inKeyRange) span in the value axis dimension.
Public Member Functions inherited from QCPAbstractPlottable1D< QCPCurveData >
	QCPAbstractPlottable1D (QCPAxis *keyAxis, QCPAxis *valueAxis)
	Forwards keyAxis and valueAxis to the QCPAbstractPlottable constructor and allocates the mDataContainer.
virtual int	dataCount () const Q_DECL_OVERRIDE
	Returns the number of data points of the plottable.
virtual double	dataMainKey (int index) const Q_DECL_OVERRIDE
	Returns the main key of the data point at the given index.
virtual double	dataSortKey (int index) const Q_DECL_OVERRIDE
	Returns the sort key of the data point at the given index.
virtual double	dataMainValue (int index) const Q_DECL_OVERRIDE
	Returns the main value of the data point at the given index.
virtual QCPRange	dataValueRange (int index) const Q_DECL_OVERRIDE
	Returns the value range of the data point at the given index.
virtual QPointF	dataPixelPosition (int index) const Q_DECL_OVERRIDE
	Returns the pixel position on the widget surface at which the data point at the given index appears.
virtual bool	sortKeyIsMainKey () const Q_DECL_OVERRIDE
	Returns whether the sort key (dataSortKey) is identical to the main key (dataMainKey).
virtual QCPDataSelection	selectTestRect (const QRectF &rect, bool onlySelectable) const Q_DECL_OVERRIDE
	Implements a rect-selection algorithm assuming the data (accessed via the 1D data interface) is point-like.
virtual int	findBegin (double sortKey, bool expandedRange=true) const Q_DECL_OVERRIDE
	Returns the index of the data point with a (sort-)key that is equal to, just below, or just above sortKey.
virtual int	findEnd (double sortKey, bool expandedRange=true) const Q_DECL_OVERRIDE
	Returns the index one after the data point with a (sort-)key that is equal to, just above, or just below sortKey.
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const Q_DECL_OVERRIDE
	Implements a point-selection algorithm assuming the data (accessed via the 1D data interface) is point-like.
virtual QCPPlottableInterface1D *	interface1D () Q_DECL_OVERRIDE
	Returns a QCPPlottableInterface1D pointer to this plottable, providing access to its 1D interface.
Public Member Functions inherited from QCPAbstractPlottable
	QCPAbstractPlottable (QCPAxis *keyAxis, QCPAxis *valueAxis)
	Constructs an abstract plottable which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y").
QString	name () const
bool	antialiasedFill () const
bool	antialiasedScatters () const
QPen	pen () const
QBrush	brush () const
QCPAxis *	keyAxis () const
QCPAxis *	valueAxis () const
QCP::SelectionType	selectable () const
bool	selected () const
	Returns true if there are any data points of the plottable currently selected.
QCPDataSelection	selection () const
	Returns a QCPDataSelection encompassing all the data points that are currently selected on this plottable.
QCPSelectionDecorator *	selectionDecorator () const
	Provides access to the selection decorator of this plottable.
void	setName (const QString &name)
	The name is the textual representation of this plottable as it is displayed in the legend (QCPLegend).
void	setAntialiasedFill (bool enabled)
	Sets whether fills of this plottable are drawn antialiased or not.
void	setAntialiasedScatters (bool enabled)
	Sets whether the scatter symbols of this plottable are drawn antialiased or not.
void	setPen (const QPen &pen)
	The pen is used to draw basic lines that make up the plottable representation in the plot.
void	setBrush (const QBrush &brush)
	The brush is used to draw basic fills of the plottable representation in the plot.
void	setKeyAxis (QCPAxis *axis)
	The key axis of a plottable can be set to any axis of a QCustomPlot, as long as it is orthogonal to the plottable's value axis.
void	setValueAxis (QCPAxis *axis)
	The value axis of a plottable can be set to any axis of a QCustomPlot, as long as it is orthogonal to the plottable's key axis.
Q_SLOT void	setSelectable (QCP::SelectionType selectable)
	Sets whether and to which granularity this plottable can be selected.
Q_SLOT void	setSelection (QCPDataSelection selection)
	Sets which data ranges of this plottable are selected.
void	setSelectionDecorator (QCPSelectionDecorator *decorator)
	Use this method to set an own QCPSelectionDecorator (subclass) instance.
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const =0
	This function is used to decide whether a click hits a layerable object or not.
virtual QCPPlottableInterface1D *	interface1D ()
	If this plottable is a one-dimensional plottable, i.e.
virtual QCPRange	getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const =0
	Returns the coordinate range that all data in this plottable span in the key axis dimension.
virtual QCPRange	getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const =0
	Returns the coordinate range that the data points in the specified key range (inKeyRange) span in the value axis dimension.
void	coordsToPixels (double key, double value, double &x, double &y) const
	Convenience function for transforming a key/value pair to pixels on the QCustomPlot surface, taking the orientations of the axes associated with this plottable into account (e.g.
const QPointF	coordsToPixels (double key, double value) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Transforms the given key and value to pixel coordinates and returns them in a QPointF.
void	pixelsToCoords (double x, double y, double &key, double &value) const
	Convenience function for transforming a x/y pixel pair on the QCustomPlot surface to plot coordinates, taking the orientations of the axes associated with this plottable into account (e.g.
void	pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns the pixel input pixelPos as plot coordinates key and value.
void	rescaleAxes (bool onlyEnlarge=false) const
	Rescales the key and value axes associated with this plottable to contain all displayed data, so the whole plottable is visible.
void	rescaleKeyAxis (bool onlyEnlarge=false) const
	Rescales the key axis of the plottable so the whole plottable is visible.
void	rescaleValueAxis (bool onlyEnlarge=false, bool inKeyRange=false) const
	Rescales the value axis of the plottable so the whole plottable is visible.
bool	addToLegend (QCPLegend *legend)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Adds this plottable to the specified legend.
bool	addToLegend ()
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Adds this plottable to the legend of the parent QCustomPlot (QCustomPlot::legend).
bool	removeFromLegend (QCPLegend *legend) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Removes the plottable from the specifed legend.
bool	removeFromLegend () const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Removes the plottable from the legend of the parent QCustomPlot.
Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=0)
	Creates a new QCPLayerable instance.
bool	visible () const
QCustomPlot *	parentPlot () const
QCPLayerable *	parentLayerable () const
	Returns the parent layerable of this layerable.
QCPLayer *	layer () const
bool	antialiased () const
void	setVisible (bool on)
	Sets the visibility of this layerable object.
Q_SLOT bool	setLayer (QCPLayer *layer)
	Sets the layer of this layerable object.
bool	setLayer (const QString &layerName)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Sets the layer of this layerable object by name.
void	setAntialiased (bool enabled)
	Sets whether this object will be drawn antialiased or not.
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const
	This function is used to decide whether a click hits a layerable object or not.
bool	realVisibility () const
	Returns whether this layerable is visible, taking the visibility of the layerable parent and the visibility of this layerable's layer into account.
virtual int	dataCount () const =0
	Returns the number of data points of the plottable.
virtual double	dataMainKey (int index) const =0
	Returns the main key of the data point at the given index.
virtual double	dataSortKey (int index) const =0
	Returns the sort key of the data point at the given index.
virtual double	dataMainValue (int index) const =0
	Returns the main value of the data point at the given index.
virtual QCPRange	dataValueRange (int index) const =0
	Returns the value range of the data point at the given index.
virtual QPointF	dataPixelPosition (int index) const =0
	Returns the pixel position on the widget surface at which the data point at the given index appears.
virtual bool	sortKeyIsMainKey () const =0
	Returns whether the sort key (dataSortKey) is identical to the main key (dataMainKey).
virtual QCPDataSelection	selectTestRect (const QRectF &rect, bool onlySelectable) const =0
	Returns a data selection containing all the data points of this plottable which are contained (or hit by) rect.
virtual int	findBegin (double sortKey, bool expandedRange=true) const =0
	Returns the index of the data point with a (sort-)key that is equal to, just below, or just above sortKey.
virtual int	findEnd (double sortKey, bool expandedRange=true) const =0
	Returns the index one after the data point with a (sort-)key that is equal to, just above, or just below sortKey.

Protected Member Functions
virtual void	draw (QCPPainter *painter) Q_DECL_OVERRIDE
virtual void	drawLegendIcon (QCPPainter *painter, const QRectF &rect) const Q_DECL_OVERRIDE
virtual void	drawCurveLine (QCPPainter *painter, const QVector< QPointF > &lines) const
virtual void	drawScatterPlot (QCPPainter *painter, const QVector< QPointF > &points, const QCPScatterStyle &style) const
void	getCurveLines (QVector< QPointF > *lines, const QCPDataRange &dataRange, double penWidth) const
void	getScatters (QVector< QPointF > *scatters, const QCPDataRange &dataRange, double scatterWidth) const
int	getRegion (double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
QPointF	getOptimizedPoint (int prevRegion, double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
QVector< QPointF >	getOptimizedCornerPoints (int prevRegion, int currentRegion, double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
bool	mayTraverse (int prevRegion, int currentRegion) const
bool	getTraverse (double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin, QPointF &crossA, QPointF &crossB) const
void	getTraverseCornerPoints (int prevRegion, int currentRegion, double keyMin, double valueMax, double keyMax, double valueMin, QVector< QPointF > &beforeTraverse, QVector< QPointF > &afterTraverse) const
double	pointDistance (const QPointF &pixelPoint, QCPCurveDataContainer::const_iterator &closestData) const
Protected Member Functions inherited from QCPAbstractPlottable1D< QCPCurveData >
void	getDataSegments (QList< QCPDataRange > &selectedSegments, QList< QCPDataRange > &unselectedSegments) const
	Splits all data into selected and unselected segments and outputs them via selectedSegments and unselectedSegments, respectively.
void	drawPolyline (QCPPainter *painter, const QVector< QPointF > &lineData) const
	A helper method which draws a line with the passed painter, according to the pixel data in lineData.
Protected Member Functions inherited from QCPAbstractPlottable
virtual QRect	clipRect () const Q_DECL_OVERRIDE
virtual void	draw (QCPPainter *painter) Q_DECL_OVERRIDE=0
virtual QCP::Interaction	selectionCategory () const Q_DECL_OVERRIDE
void	applyDefaultAntialiasingHint (QCPPainter *painter) const Q_DECL_OVERRIDE
virtual void	selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) Q_DECL_OVERRIDE
virtual void	deselectEvent (bool *selectionStateChanged) Q_DECL_OVERRIDE
virtual void	drawLegendIcon (QCPPainter *painter, const QRectF &rect) const =0
void	applyFillAntialiasingHint (QCPPainter *painter) const
void	applyScattersAntialiasingHint (QCPPainter *painter) const
Protected Member Functions inherited from QCPLayerable
virtual void	parentPlotInitialized (QCustomPlot *parentPlot)
virtual QCP::Interaction	selectionCategory () const
virtual QRect	clipRect () const
virtual void	applyDefaultAntialiasingHint (QCPPainter *painter) const =0
virtual void	draw (QCPPainter *painter)=0
virtual void	selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
virtual void	deselectEvent (bool *selectionStateChanged)
virtual void	mousePressEvent (QMouseEvent *event, const QVariant &details)
	This event gets called when the user presses a mouse button while the cursor is over the layerable.
virtual void	mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
	This event gets called when the user moves the mouse while holding a mouse button, after this layerable has become the mouse grabber by accepting the preceding mousePressEvent.
virtual void	mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
	This event gets called when the user releases the mouse button, after this layerable has become the mouse grabber by accepting the preceding mousePressEvent.
virtual void	mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
	This event gets called when the user presses the mouse button a second time in a double-click, while the cursor is over the layerable.
virtual void	wheelEvent (QWheelEvent *event)
	This event gets called when the user turns the mouse scroll wheel while the cursor is over the layerable.
void	initializeParentPlot (QCustomPlot *parentPlot)
void	setParentLayerable (QCPLayerable *parentLayerable)
bool	moveToLayer (QCPLayer *layer, bool prepend)
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

Protected Attributes
QCPScatterStyle	mScatterStyle
int	mScatterSkip
LineStyle	mLineStyle
Protected Attributes inherited from QCPAbstractPlottable1D< QCPCurveData >
QSharedPointer< QCPDataContainer< QCPCurveData > >	mDataContainer
Protected Attributes inherited from QCPAbstractPlottable
QString	mName
bool	mAntialiasedFill
bool	mAntialiasedScatters
QPen	mPen
QBrush	mBrush
QPointer< QCPAxis >	mKeyAxis
QPointer< QCPAxis >	mValueAxis
QCP::SelectionType	mSelectable
QCPDataSelection	mSelection
QCPSelectionDecorator *	mSelectionDecorator
Protected Attributes inherited from QCPLayerable
bool	mVisible
QCustomPlot *	mParentPlot
QPointer< QCPLayerable >	mParentLayerable
QCPLayer *	mLayer
bool	mAntialiased

Friends
class	QCustomPlot
class	QCPLegend

Additional Inherited Members
Signals inherited from QCPAbstractPlottable
void	selectionChanged (bool selected)
	This signal is emitted when the selection state of this plottable has changed, either by user interaction or by a direct call to setSelection.
void	selectionChanged (const QCPDataSelection &selection)
	This signal is emitted when the selection state of this plottable has changed, either by user interaction or by a direct call to setSelection.
void	selectableChanged (QCP::SelectionType selectable)
	This signal is emitted when the selectability of this plottable has changed.
Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)
	This signal is emitted when the layer of this layerable changes, i.e.

Detailed Description

A plottable representing a parametric curve in a plot.

Unlike QCPGraph, plottables of this type may have multiple points with the same key coordinate, so their visual representation can have loops. This is realized by introducing a third coordinate t, which defines the order of the points described by the other two coordinates x and y.

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

Gaps in the curve can be created by adding data points with NaN as key and 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 curve is determined by the pen and the brush (setPen, setBrush).

Usage

Like all data representing objects in QCustomPlot, the QCPCurve is a plottable (QCPAbstractPlottable). So the plottable-interface of QCustomPlot applies (QCustomPlot::plottable, QCustomPlot::removePlottable, etc.)

Usually, you first create an instance:

which registers it with the QCustomPlot instance of the passed axes. Note that this QCustomPlot instance takes ownership of the plottable, so do not delete it manually but use QCustomPlot::removePlottable() instead. The newly created plottable can be modified, e.g.:

Member Enumeration Documentation

LineStyle

enum QCPCurve::LineStyle

Defines how the curve's line is represented visually in the plot.

The line is drawn with the current pen of the curve (setPen).

See also

setLineStyle

Enumerator
lsNone	No line is drawn between data points (e.g. only scatters)
lsLine	Data points are connected with a straight line.

Constructor & Destructor Documentation

QCPCurve()

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

explicit

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

Member Function Documentation

addData() [1/4]

void QCPCurve::addData	(	const QVector< double > &	keys,
		const QVector< double > &	values
	)

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.

The t parameter of each data point will be set to the integer index of the respective key/value pair.

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

addData() [2/4]

void QCPCurve::addData	(	const QVector< double > &	t,
		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 t, 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.

addData() [3/4]

void QCPCurve::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.

The t parameter is generated automatically by increments of 1 for each point, starting at the highest t of previously existing data or 0, if the curve data is empty.

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

addData() [4/4]

void QCPCurve::addData	(	double	t,
		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 t, 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.

data()

QSharedPointer< QCPCurveDataContainer > QCPCurve::data ( ) const

inline

Returns a shared pointer to the internal data storage of type QCPCurveDataContainer.

You may use it to directly manipulate the data, which may be more convenient and faster than using the regular setData or addData methods.

draw()

void QCPCurve::draw ( QCPPainter *  painter )

protectedvirtual

Implements QCPAbstractPlottable.

drawLegendIcon()

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

protectedvirtual

Implements QCPAbstractPlottable.

getKeyRange()

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

virtual

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.

getValueRange()

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

virtual

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.

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, getKeyRange

Implements QCPAbstractPlottable.

selectTest()

double QCPCurve::selectTest ( const QPointF &  pos, bool  onlySelectable, QVariant *  details = 0  ) const

virtual

Implements a point-selection algorithm assuming the data (accessed via the 1D data interface) is point-like.

Most subclasses will want to reimplement this method again, to provide a more accurate hit test based on the true data visualization geometry.

\seebaseclassmethod

Reimplemented from QCPAbstractPlottable1D< QCPCurveData >.

setData() [1/3]

void QCPCurve::setData	(	const QVector< double > &	keys,
		const QVector< double > &	values
	)

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.

The t parameter of each data point will be set to the integer index of the respective key/value pair.

See also

addData

setData() [2/3]

void QCPCurve::setData	(	const QVector< double > &	t,
		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 t, 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 t in ascending order, you can set alreadySorted to true, to improve performance by saving a sorting run.

See also

addData

setData() [3/3]

void QCPCurve::setData

(

QSharedPointer< QCPCurveDataContainer >

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 QCPCurves may share the same data container safely. Modifying the data in the container will then affect all curves 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 curve's data container directly:

See also

addData

setLineStyle()

void QCPCurve::setLineStyle

(

QCPCurve::LineStyle

style

)

Sets how the single data points are connected in the plot or how they are represented visually apart from the scatter symbol.

For scatter-only plots, set style to lsNone and setScatterStyle to the desired scatter style.

See also

setScatterStyle

setScatterSkip()

void QCPCurve::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

setScatterStyle()

void QCPCurve::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

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

• qcustomplot.h
• qcustomplot.cpp