A plottable representing a bar chart in a plot. More...

Inheritance diagram for QCPBars:

Public Types
enum	WidthType { wtAbsolute , wtAxisRectRatio , wtPlotCoords }

Public Member Functions
	QCPBars (QCPAxis keyAxis, QCPAxis valueAxis)
double	width () const
WidthType	widthType () const
QCPBarsGroup *	barsGroup () const
double	baseValue () const
double	stackingGap () const
QCPBars *	barBelow () const
QCPBars *	barAbove () const
QSharedPointer< QCPBarsDataContainer >	data () const
void	setData (QSharedPointer< QCPBarsDataContainer > data)
void	setData (const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)
void	setWidth (double width)
void	setWidthType (WidthType widthType)
void	setBarsGroup (QCPBarsGroup *barsGroup)
void	setBaseValue (double baseValue)
void	setStackingGap (double pixels)
void	addData (const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)
void	addData (double key, double value)
void	moveBelow (QCPBars *bars)
void	moveAbove (QCPBars *bars)
virtual QCPDataSelection	selectTestRect (const QRectF &rect, bool onlySelectable) const Q_DECL_OVERRIDE
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const Q_DECL_OVERRIDE
virtual QCPRange	getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const Q_DECL_OVERRIDE
virtual QCPRange	getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const Q_DECL_OVERRIDE
virtual QPointF	dataPixelPosition (int index) const Q_DECL_OVERRIDE
Public Member Functions inherited from QCPAbstractPlottable1D< QCPBarsData >
	QCPAbstractPlottable1D (QCPAxis keyAxis, QCPAxis valueAxis)
virtual int	dataCount () const Q_DECL_OVERRIDE
virtual double	dataMainKey (int index) const Q_DECL_OVERRIDE
virtual double	dataSortKey (int index) const Q_DECL_OVERRIDE
virtual double	dataMainValue (int index) const Q_DECL_OVERRIDE
virtual QCPRange	dataValueRange (int index) const Q_DECL_OVERRIDE
virtual bool	sortKeyIsMainKey () const Q_DECL_OVERRIDE
virtual int	findBegin (double sortKey, bool expandedRange=true) const Q_DECL_OVERRIDE
virtual int	findEnd (double sortKey, bool expandedRange=true) const Q_DECL_OVERRIDE
virtual QCPPlottableInterface1D *	interface1D () Q_DECL_OVERRIDE
Public Member Functions inherited from QCPAbstractPlottable
	QCPAbstractPlottable (QCPAxis keyAxis, QCPAxis valueAxis)
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
QCPDataSelection	selection () const
QCPSelectionDecorator *	selectionDecorator () const
void	setName (const QString &name)
void	setAntialiasedFill (bool enabled)
void	setAntialiasedScatters (bool enabled)
void	setPen (const QPen &pen)
void	setBrush (const QBrush &brush)
void	setKeyAxis (QCPAxis *axis)
void	setValueAxis (QCPAxis *axis)
Q_SLOT void	setSelectable (QCP::SelectionType selectable)
Q_SLOT void	setSelection (QCPDataSelection selection)
void	setSelectionDecorator (QCPSelectionDecorator *decorator)
void	coordsToPixels (double key, double value, double &x, double &y) const
const QPointF	coordsToPixels (double key, double value) const
void	pixelsToCoords (double x, double y, double &key, double &value) const
void	pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
void	rescaleAxes (bool onlyEnlarge=false) const
void	rescaleKeyAxis (bool onlyEnlarge=false) const
void	rescaleValueAxis (bool onlyEnlarge=false, bool inKeyRange=false) const
bool	addToLegend (QCPLegend *legend)
bool	addToLegend ()
bool	removeFromLegend (QCPLegend *legend) const
bool	removeFromLegend () const
Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot plot, QString targetLayer=QString(), QCPLayerable parentLayerable=nullptr)
bool	visible () const
QCustomPlot *	parentPlot () const
QCPLayerable *	parentLayerable () const
QCPLayer *	layer () const
bool	antialiased () const
void	setVisible (bool on)
Q_SLOT bool	setLayer (QCPLayer *layer)
bool	setLayer (const QString &layerName)
void	setAntialiased (bool enabled)
bool	realVisibility () const

Protected Member Functions
virtual void	draw (QCPPainter *painter) Q_DECL_OVERRIDE
virtual void	drawLegendIcon (QCPPainter *painter, const QRectF &rect) const Q_DECL_OVERRIDE
void	getVisibleDataBounds (QCPBarsDataContainer::const_iterator &begin, QCPBarsDataContainer::const_iterator &end) const
QRectF	getBarRect (double key, double value) const
void	getPixelWidth (double key, double &lower, double &upper) const
double	getStackedBaseValue (double key, bool positive) const
Protected Member Functions inherited from QCPAbstractPlottable1D< QCPBarsData >
void	getDataSegments (QList< QCPDataRange > &selectedSegments, QList< QCPDataRange > &unselectedSegments) const
void	drawPolyline (QCPPainter *painter, const QVector< QPointF > &lineData) const
Protected Member Functions inherited from QCPAbstractPlottable
virtual QRect	clipRect () const Q_DECL_OVERRIDE
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
void	applyFillAntialiasingHint (QCPPainter *painter) const
void	applyScattersAntialiasingHint (QCPPainter *painter) const
Protected Member Functions inherited from QCPLayerable
virtual void	parentPlotInitialized (QCustomPlot *parentPlot)
virtual void	mousePressEvent (QMouseEvent *event, const QVariant &details)
virtual void	mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
virtual void	mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
virtual void	mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
virtual void	wheelEvent (QWheelEvent *event)
void	initializeParentPlot (QCustomPlot *parentPlot)
void	setParentLayerable (QCPLayerable *parentLayerable)
bool	moveToLayer (QCPLayer *layer, bool prepend)
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

Static Protected Member Functions
static void	connectBars (QCPBars lower, QCPBars upper)

Protected Attributes
double	mWidth
WidthType	mWidthType
QCPBarsGroup *	mBarsGroup
double	mBaseValue
double	mStackingGap
QPointer< QCPBars >	mBarBelow
QPointer< QCPBars >	mBarAbove
Protected Attributes inherited from QCPAbstractPlottable1D< QCPBarsData >
QSharedPointer< QCPDataContainer< QCPBarsData > >	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
class	QCPBarsGroup

Additional Inherited Members
Signals inherited from QCPAbstractPlottable
void	selectionChanged (bool selected)
void	selectionChanged (const QCPDataSelection &selection)
void	selectableChanged (QCP::SelectionType selectable)
Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)

Detailed Description

A plottable representing a bar chart in a plot.

To plot data, assign it with the setData or addData functions.

Changing the appearance

The appearance of the bars is determined by the pen and the brush (setPen, setBrush). The width of the individual bars can be controlled with setWidthType and setWidth.

Bar charts are stackable. This means, two QCPBars plottables can be placed on top of each other (see QCPBars::moveAbove). So when two bars are at the same key position, they will appear stacked.

If you would like to group multiple QCPBars plottables together so they appear side by side as shown below, use QCPBarsGroup.

Usage

Like all data representing objects in QCustomPlot, the QCPBars 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

◆ WidthType

enum QCPBars::WidthType

Defines the ways the width of the bar can be specified. Thus it defines what the number passed to setWidth actually means.

See also: setWidthType, setWidth

Enumerator
wtAbsolute	Bar width is in absolute pixels.
wtAxisRectRatio	Bar width is given by a fraction of the axis rect size.
wtPlotCoords	Bar width is in key coordinates and thus scales with the key axis range.

Constructor & Destructor Documentation

◆ QCPBars()

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

explicit

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

Member Function Documentation

◆ addData() [1/2]

void QCPBars::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.

◆ addData() [2/2]

void QCPBars::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.

◆ barAbove()

QCPBars * QCPBars::barAbove ( ) const

inline

Returns the bars plottable that is directly above this bars plottable. If there is no such plottable, returns nullptr.

See also: barBelow, moveBelow, moveAbove

◆ barBelow()

QCPBars * QCPBars::barBelow ( ) const

inline

Returns the bars plottable that is directly below this bars plottable. If there is no such plottable, returns nullptr.

See also: barAbove, moveBelow, moveAbove

◆ data()

QSharedPointer< QCPBarsDataContainer > QCPBars::data ( ) const

inline

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

◆ dataPixelPosition()

QPointF QCPBars::dataPixelPosition ( int index ) const

virtual

Returns the pixel position on the widget surface at which the data point at the given index appears.

Usually this corresponds to the point of dataMainKey/ dataMainValue, in pixel coordinates. However, depending on the plottable, this might be a different apparent position than just a coord-to-pixel transform of those values. For example, QCPBars apparent data values can be shifted depending on their stacking, bar grouping or configured base value.

Reimplemented from QCPAbstractPlottable1D< QCPBarsData >.

◆ draw()

void QCPBars::draw ( QCPPainter * painter )

protectedvirtual

Implements QCPAbstractPlottable.

◆ drawLegendIcon()

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

protectedvirtual

Implements QCPAbstractPlottable.

◆ getKeyRange()

QCPRange QCPBars::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 QCPBars::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.

◆ moveAbove()

void QCPBars::moveAbove ( QCPBars * bars )

Moves this bars plottable above bars. In other words, the bars of this plottable will appear above the bars of bars. The move target bars must use the same key and value axis as this plottable.

Inserting into and removing from existing bar stacking is handled gracefully. If bars already has a bars object above itself, this bars object is inserted between the two. If this bars object is already between two other bars, the two other bars will be stacked on top of each other after the operation.

To remove this bars plottable from any stacking, set bars to nullptr.

See also: moveBelow, barBelow, barAbove

◆ moveBelow()

void QCPBars::moveBelow ( QCPBars * bars )

Moves this bars plottable below bars. In other words, the bars of this plottable will appear below the bars of bars. The move target bars must use the same key and value axis as this plottable.

Inserting into and removing from existing bar stacking is handled gracefully. If bars already has a bars object below itself, this bars object is inserted between the two. If this bars object is already between two other bars, the two other bars will be stacked on top of each other after the operation.

To remove this bars plottable from any stacking, set bars to nullptr.

See also: moveBelow, barAbove, barBelow

◆ selectTest()

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

virtual

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< QCPBarsData >.

◆ selectTestRect()

QCPDataSelection QCPBars::selectTestRect	(	const QRectF &	rect,
		bool	onlySelectable ) const

virtual

Returns a data selection containing all the data points of this plottable which are contained (or hit by) rect. This is used mainly in the selection rect interaction for data selection (data selection mechanism).

If onlySelectable is true, an empty QCPDataSelection is returned if this plottable is not selectable (i.e. if QCPAbstractPlottable::setSelectable is QCP::stNone).

Note: rect must be a normalized rect (positive or zero width and height). This is especially important when using the rect of QCPSelectionRect::accepted, which is not necessarily normalized. Use QRect::normalized() when passing a rect which might not be normalized.

Reimplemented from QCPAbstractPlottable1D< QCPBarsData >.

◆ setBarsGroup()

void QCPBars::setBarsGroup ( QCPBarsGroup * barsGroup )

Sets to which QCPBarsGroup this QCPBars instance belongs to. Alternatively, you can also use QCPBarsGroup::append.

To remove this QCPBars from any group, set barsGroup to nullptr.

◆ setBaseValue()

void QCPBars::setBaseValue ( double baseValue )

Sets the base value of this bars plottable.

The base value defines where on the value coordinate the bars start. How far the bars extend from the base value is given by their individual value data. For example, if the base value is set to 1, a bar with data value 2 will have its lowest point at value coordinate 1 and highest point at 3.

For stacked bars, only the base value of the bottom-most QCPBars has meaning.

The default base value is 0.

◆ setData() [1/2]

void QCPBars::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

◆ setData() [2/2]

void QCPBars::setData ( QSharedPointer< QCPBarsDataContainer > 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 QCPBars may share the same data container safely. Modifying the data in the container will then affect all bars 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 bar's data container directly:

See also: addData

◆ setStackingGap()

void QCPBars::setStackingGap ( double pixels )

If this bars plottable is stacked on top of another bars plottable (moveAbove), this method allows specifying a distance in pixels, by which the drawn bar rectangles will be separated by the bars below it.

◆ setWidth()

void QCPBars::setWidth ( double width )

Sets the width of the bars.

How the number passed as width is interpreted (e.g. screen pixels, plot coordinates,...), depends on the currently set width type, see setWidthType and WidthType.

◆ setWidthType()

void QCPBars::setWidthType ( QCPBars::WidthType widthType )

Sets how the width of the bars is defined. See the documentation of WidthType for an explanation of the possible values for widthType.

The default value is wtPlotCoords.

See also: setWidth

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

qcustomplot.h
qcustomplot.cpp

Public Types

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Changing the appearance

Usage

Member Enumeration Documentation

◆ WidthType

Constructor & Destructor Documentation

◆ QCPBars()

Member Function Documentation

◆ addData() [1/2]

◆ addData() [2/2]

◆ barAbove()

◆ barBelow()

◆ data()

◆ dataPixelPosition()

◆ draw()

◆ drawLegendIcon()

◆ getKeyRange()

◆ getValueRange()

◆ moveAbove()

◆ moveBelow()

◆ selectTest()

◆ selectTestRect()

◆ setBarsGroup()

◆ setBaseValue()

◆ setData() [1/2]

◆ setData() [2/2]

◆ setStackingGap()

◆ setWidth()

◆ setWidthType()