This graph plots a series of data labels. This can be used to add number-labels to e.g. a barchart. More...

#include <jkqtpgraphlabels.h>

Inheritance diagram for JKQTPXYGraphLabels:

Collaboration diagram for JKQTPXYGraphLabels:

Public Types
enum	LabelContentsDefaultType { XValueLabel , YValueLabel , XYValueLabel }
typedef std::function< QString(double, double, int)>	LabelGenerator
	type of a functor that generates a label
Public Types inherited from JKQTPXYGraph
enum	DataSortOrder { Unsorted =0 , SortedX =1 , SortedY =2 }
	specifies how to sort the data in a JKQTPXYGraph before drawing More...
Public Types inherited from JKQTPPlotElement
enum	HitTestMode { HitTestXY , HitTestXOnly , HitTestYOnly }
	modes of operation for the function hitTest() More...

Public Member Functions
	JKQTPXYGraphLabels (const LabelGenerator &lgen, JKQTBasePlotter *parent=nullptr)
	class constructor, generates a JKQTPXYGraphLabels with a custom LabelGenerator functor
	JKQTPXYGraphLabels (const LabelGenerator &lgen, JKQTPlotter *parent)
	class constructor, generates a JKQTPXYGraphLabels with a custom LabelGenerator functor
	JKQTPXYGraphLabels (LabelContentsDefaultType lt, JKQTBasePlotter *parent=nullptr)
	class constructor, generates a JKQTPXYGraphLabels with one of the default label generator functors (x-value, y-value or x+y-values)
	JKQTPXYGraphLabels (LabelContentsDefaultType lt, JKQTPlotter *parent)
	class constructor, generates a JKQTPXYGraphLabels with one of the default label generator functors (x-value, y-value or x+y-values)
virtual void	draw (JKQTPEnhancedPainter &painter) override
	plots the graph to the plotter object specified as parent
virtual void	drawKeyMarker (JKQTPEnhancedPainter &painter, const QRectF &rect) override
	plots a key marker inside the specified rectangle rect
virtual QColor	getKeyLabelColor () const override
	returns the color to be used for the key label
virtual bool	getXMinMax (double &minx, double &maxx, double &smallestGreaterZero) override
	get the maximum and minimum x-value of the graph
virtual bool	getYMinMax (double &miny, double &maxy, double &smallestGreaterZero) override
	get the maximum and minimum y-value of the graph
void	setColor (QColor c, bool setTextColor_=true, bool setFrameColor_=true)
	set color of line and symbol
void	setCustomLabelGenerator (const LabelGenerator &labgen)
	sets a custom label geneator function of type LabelGenerator to use
void	setDefaultXLabelGenerator ()
	sets the label geneator function to a default implementation, that prints the x-value only
void	setDefaultXYLabelGenerator ()
	sets the label geneator function to a default implementation, that prints the x- and y-value
void	setDefaultYLabelGenerator ()
	sets the label geneator function to a default implementation, that prints the y-value only
Public Member Functions inherited from JKQTPXYGraph
	JKQTPXYGraph (JKQTBasePlotter *parent=nullptr)
	class constructor
DataSortOrder	getDataSortOrder () const
	if `!=Unsorted`, the data is sorted before plotting
virtual int	getKeyColumn () const
	returns the column used as "key" for the current graph (typically this call getXColumn(), but for horizontal graphs like filled curves or barcharts it may call getYColumn() )
virtual int	getValueColumn () const
	returns the column used as "value" for the current graph (typically this call getXColumn(), but for horizontal graphs like filled curves or barcharts it may call getYColumn() )
int	getXColumn () const
	the column that contains the x-component of the datapoints
int	getYColumn () const
	the column that contains the y-component of the datapoints
virtual double	hitTest (const QPointF &posSystem, QPointF closestSpotSystem=nullptr, QString label=nullptr, HitTestMode mode=HitTestXY) const override
	Implmentation of JKQTPPlotElement::hitTest(), which searches through all graph points defined by xColumn and yColumn and returns a general x/y-label, also taking into account possibly known errors to the graphs (if it is derived from JKQTPXGraphErrorData and/or JKQTPYGraphErrorData.
virtual bool	usesColumn (int column) const override
	returns `true` if the given column is used by the graph
Public Member Functions inherited from JKQTPGraph
	JKQTPGraph (JKQTBasePlotter *parent=nullptr)
	class constructor
virtual	~JKQTPGraph ()=default
	default wirtual destructor
Public Member Functions inherited from JKQTPPlotElement
	JKQTPPlotElement (JKQTBasePlotter *parent=nullptr)
	class constructor
virtual	~JKQTPPlotElement ()=default
	default wirtual destructor
QPointF	backTransform (const QPointF &x) const
	tool routine that back-transforms a QPointF according to the parent's transformation rules (pixels --> plot coordinate)
QPointF	backTransform (double x, double y) const
	tool routine that back-transforms a QPointF according to the parent's transformation rules (pixels --> plot coordinate)
double	backtransformX (double x) const
	tool routine that backtransforms an x-coordinate (pixels --> plot coordinate) for this plot element, uses the axis referenced in xAxisRef
double	backtransformY (double y) const
	tool routine that backtransforms a y-coordinate (pixels --> plot coordinate) for this plot element, uses the axis referenced in yAxisRef
virtual void	drawOutside (JKQTPEnhancedPainter &painter, QRect leftSpace, QRect rightSpace, QRect topSpace, QRect bottomSpace)
	plots outside the actual plot field of view (e.g. color bars, scale bars, ...)
QImage	generateKeyMarker (QSize size=QSize(16, 16))
	returns an image with a key marker inside
virtual void	getOutsideSize (JKQTPEnhancedPainter &painter, int &leftSpace, int &rightSpace, int &topSpace, int &bottomSpace)
	if the graph plots outside the actual plot field of view (e.g. color bars, scale bars, ...)
JKQTBasePlotter *	getParent ()
	returns the parent painter class
const JKQTBasePlotter *	getParent () const
	returns the parent painter class
QString	getTitle () const
	returns the the title of the plot
const JKQTPCoordinateAxis *	getXAxis () const
	returns the actual x-Axis-object from the parent plotter, referenced in xAxisRef
JKQTPCoordinateAxisRef	getXAxisRef () const
	indicates which coordinate axis to use for coordinate transforms in x-direction
const JKQTPCoordinateAxis *	getYAxis () const
	returns the actual y-Axis-object from the parent plotter, referenced in yAxisRef
JKQTPCoordinateAxisRef	getYAxisRef () const
	indicates which coordinate axis to use for coordinate transforms in y-direction
bool	isHighlighted () const
	returns whether the graph is shown in a highlighted style in the plot
bool	isVisible () const
	returns whether the graph is visible in the plot
void	setAxes (JKQTPCoordinateAxisRef ref)
	set the coordinate axes to use for this plot element
virtual void	setParent (JKQTBasePlotter *parent)
	sets the parent painter class
virtual void	setParent (JKQTPlotter *parent)
	sets the parent painter class
void	setXAxis (JKQTPCoordinateAxisRef ref)
	indicates which coordinate axis to use for coordinate transforms in x-direction
void	setYAxis (JKQTPCoordinateAxisRef ref)
	indicates which coordinate axis to use for coordinate transforms in y-direction
QPointF	transform (const QPointF &x) const
	tool routine that transforms a QPointF according to the parent's transformation rules (plot coordinate --> pixels)
QPolygonF	transform (const QPolygonF &x) const
	tool routine that transforms a QPolygonF according to the parent's transformation rules (plot coordinate --> pixels)
QPointF	transform (double x, double y) const
	tool routine that transforms a QPointF according to the parent's transformation rules (plot coordinate --> pixels)
QPainterPath	transformToLinePath (const QPolygonF &x) const
	tool routine that transforms a QPolygonF according to the parent's transformation rules and returns a (non-closed) path consisting of lines (plot coordinate --> pixels)
QVector< double >	transformX (const QVector< double > &x) const
	transform all x-coordinates in a vector x
double	transformX (double x) const
	tool routine that transforms an x-coordinate (plot coordinate --> pixels) for this plot element, uses the axis referenced in xAxisRef
QVector< double >	transformY (const QVector< double > &x) const
	transform all y-coordinates in a vector x
double	transformY (double y) const
	tool routine that transforms a y-coordinate (plot coordinate --> pixels) for this plot element, uses the axis referenced in yAxisRef
Public Member Functions inherited from JKQTPGraphValueLabelStyleMixin
	JKQTPGraphValueLabelStyleMixin (JKQTBasePlotter *parent)
	class constructor
virtual	~JKQTPGraphValueLabelStyleMixin ()
void	drawLabel (JKQTPEnhancedPainter &painter, const QPointF &xDataPixel, const QPointF &xData, const QString &contents, JKQTBasePlotter *parent, double baselineX, double baselineY) const
	draws a label, including its box
bool	drawsLabelBoxFrame () const
	indicates whether to draw a frame around the box *
double	getLabelBoxRounding () const
	rounding radius of the box rectangle (<=0 -> no rounded rectangle) [pt]
JKQTPGraphLabelBoxType	getLabelBoxType () const
	type or style of the box surrounding the label text
double	getLabelOffset () const
	offset of the box rectangle to the actual data point location [pt], this is used for simple boxes and is a rather close distance (e.g. JKQTPGLSimpleBox)
double	getLabelOffsetWithConnector () const
	offset of the box rectangle to the actual data point location [pt], this variant is used when a visible connector is shown (e.g. JKQTPGLSimpleBoxAndLine)
JKQTPGraphLabelPosition	getLabelPosition () const
	position of the label
double	getLabelXPadding () const
	padding in x-direction between label and surrounding box [pt]
double	getLabelYPadding () const
	padding in y-direction between label and surrounding box [pt] *
double	getUsedLabelOffset () const
	determines, whether to use getLabelOffset() or getLabelOffsetWithConnector() (or something else) and returns it
void	initValueLabelStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
	initiaize the fill style (from the parent plotter)
bool	isLabelPositioningGrowingInX () const
	determines whether a label is positioned left of the mininmum, or right of the maxinmum datapoint (`true` )
bool	isLabelPositioningGrowingInY () const
	determines whether a label is positioned below the mininmum, or above the maxinmum datapoint (`true` )
void	setDrawLabelBoxFrame (bool r)
	indicates whether to draw a frame around the box *
void	setLabelBoxRounding (double r)
	rounding radius of the box rectangle (<=0 -> no rounded rectangle) [pt]
void	setLabelBoxType (JKQTPGraphLabelBoxType r)
	type or style of the box surrounding the label text
void	setLabelOffset (double r)
	offset of the box rectangle to the actual data point location [pt], this is used for simple boxes and is a rather close distance (e.g. JKQTPGLSimpleBox)
void	setLabelOffsetWithConnector (double r)
	offset of the box rectangle to the actual data point location [pt], this variant is used when a visible connector is shown (e.g. JKQTPGLSimpleBoxAndLine)
void	setLabelPosition (JKQTPGraphLabelPosition r)
	position of the label
void	setLabelXPadding (double r)
	padding in x-direction between label and surrounding box [pt]
void	setLabelYPadding (double r)
	padding in y-direction between label and surrounding box [pt] *
Public Member Functions inherited from JKQTPGraphTextStyleMixin
	JKQTPGraphTextStyleMixin (JKQTBasePlotter *parent)
	class constructor
virtual	~JKQTPGraphTextStyleMixin ()
QColor	getTextColor () const
	set the color of the text
QString	getTextFontName () const
	get the base font name of text
double	getTextFontSize () const
	get the base font size of text
void	initTextStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
	initiaize the fill style (from the parent plotter)
void	setTextColor (const QColor &__value)
	set the color of the text
void	setTextColor (const QColor &__value, double alpha)
	set the color of the text
void	setTextFontName (const QString &__value)
	set the base font name of text
void	setTextFontSize (double __value)
	set the base font size of text
Public Member Functions inherited from JKQTPGraphLineStyleMixin
	JKQTPGraphLineStyleMixin ()
	class constructor
virtual	~JKQTPGraphLineStyleMixin ()
QColor	getHighlightingLineColor () const
	get the color of the graph line when highlighted
QPen	getHighlightingLinePen (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
	constructs a QPen from the line styling properties
QPen	getHighlightingLinePenForRects (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
	constructs a QPen from the line styling properties, suitable for drawing rectangle with sharp corners
QPen	getKeyLinePen (JKQTPEnhancedPainter &painter, const QRectF &rect, JKQTBasePlotter *parent) const
	constructs a QPen from the line styling properties, but uses getKeyLineWidthPx() for the width, i.e. constructs a pen for drawing lines in key-symbols
double	getKeyLineWidthPx (JKQTPEnhancedPainter &painter, const QRectF &keyRect, const JKQTBasePlotter *parent) const
	returns the linewidth for drawing lines in a key entry with keyRect for the symbol, using painter and parent .
QBrush	getLineBrush () const
	gets the brush used to fill the line area
Qt::PenCapStyle	getLineCapStyle () const
	gets the cap style
QColor	getLineColor () const
	get the color of the graph line
qreal	getLineDashOffset () const
	returns the dash offset for a custom dash style
QVector< qreal >	getLineDashPattern () const
	gets the dash pattern for a custom dash style
Qt::PenJoinStyle	getLineJoinStyle () const
	returns the join style
QPen	getLinePen (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
	constructs a QPen from the line styling properties
QPen	getLinePenForRects (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
	constructs a QPen from the line styling properties, suitable for drawing rectangles with sharp edges
Qt::PenStyle	getLineStyle () const
	get the style of the graph line
double	getLineWidth () const
	get the line width of the graph line (in pt)
void	initLineStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
	initiaize the line style (from the parent plotter)
void	setHighlightingLineColor (const QColor &__value)
	set the color of the graph line when highlighted
void	setHighlightingLineColor (const QColor &__value, double alpha)
	set the color of the graph line when highlighted
void	setLineBrush (const QBrush &style)
	sets the brush used to fill the line area
void	setLineCapStyle (Qt::PenCapStyle style)
	sets the cap style
void	setLineColor (const QColor &__value)
	set the color of the graph line
void	setLineColor (const QColor &__value, double alpha)
	set the color of the graph line
void	setLineColorInvertedFrom (QColor __noninvertedColor)
	sets the line-color as an inverted version of the given color
void	setLineDashOffset (qreal offset)
	sets the dash offset for a custom dash style
void	setLineDashPattern (const QVector< qreal > &pattern)
	sets the dash pattern for a custom dash style
void	setLineJoinStyle (Qt::PenJoinStyle style)
	sets the join style
void	setLineStyle (Qt::PenStyle __value)
	set the style of the graph line
void	setLineWidth (double __value)
	set the line width of the graph line (in pt)
Public Member Functions inherited from JKQTPGraphFillStyleMixin
	JKQTPGraphFillStyleMixin ()
	class constructor
virtual	~JKQTPGraphFillStyleMixin ()
QBrush	getFillBrush (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
	constructs a QBrush from the graph fill styling properties
QColor	getFillColor () const
	set the color of the graph filling
const QGradient *	getFillGradient () const
	get the gradient object of the graph filling
Qt::BrushStyle	getFillStyle () const
	get the fill style of the graph
QPixmap	getFillTexture () const
	set the color of the graph filling
QImage	getFillTextureImage () const
	set the color of the graph filling
void	initFillStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
	initiaize the fill style (from the parent plotter)
void	initFillStyleInvertedColor (JKQTPGraphFillStyleMixin *other)
	initiaize the fill style from another JKQTPGraphFillStyleMixin other by inverting its fill color
void	setFillBrush (const QBrush &b)
	sets a fill brush (overwrites all internal properties!)
void	setFillColor (const QColor &__value)
	set the color of the graph filling
void	setFillColor (const QColor &__value, double alpha)
	set the color of the graph filling
void	setFillGradient (const QGradient &__value)
	set the filling of the graph to a gradient and sets fill style to a gradient setting
void	setFillStyle (Qt::BrushStyle __value)
	set the fill style of the graph
void	setFillTexture (const QImage &__value)
	set the color of the graph filling and sets fill style to Qt::TexturePattern
void	setFillTexture (const QPixmap &__value)
	set the color of the graph filling and sets fill style to Qt::TexturePattern
void	setFillTransform (const QTransform &b)
	sets a fill transformation
Public Member Functions inherited from JKQTPXYLabelsGeneratorMixin
	JKQTPXYLabelsGeneratorMixin ()
	class constructor
virtual	~JKQTPXYLabelsGeneratorMixin ()
double	getXBelowIsZero () const
	x-values below this value are treated as exactly 0
QString	getXDateTimeFormat () const
	format string for datetime -> string conversion of x-values
JKQTPGraphLabelConverterType	getXDefaultConverter () const
	type of number to string conversion for x-values
int	getXDefaultPrecision () const
	default precision for x-labels
double	getXMaxNoExponent () const
	x-values above this value will be shown in exponent notation, below in decimal notation
double	getXMinNoExponent () const
	x-values below this value will be shown in exponent notation, above in decimal notation
QString	getXValueLabelFormat () const
	format string for the x-label, use `%1` as placeholder for the numeric value
QString	getXYValueLabelFormat () const
	format string for the x/y-label, use `%1` as placeholder for the numeric value of x and `%2` for y
double	getYBelowIsZero () const
	y-values below this value are treated as exactly 0
QString	getYDateTimeFormat () const
	format string for datetime -> string conversion of y-value
JKQTPGraphLabelConverterType	getYDefaultConverter () const
	type of number to string conversion for y-values
int	getYDefaultPrecision () const
	default precision for x-labels
double	getYMaxNoExponent () const
	y-values above this value will be shown in exponent notation, below in decimal notation
double	getYMinNoExponent () const
	y-values below this value will be shown in exponent notation, above in decimal notation
QString	getYValueLabelFormat () const
	format string for the y-label, use `%1` as placeholder for the numeric value
void	setXBelowIsZero (double v)
	x-values below this value are treated as exactly 0
void	setXDateTimeFormat (const QString &v)
	format string for datetime -> string conversion of x-values
void	setXDefaultConverter (JKQTPGraphLabelConverterType v)
	type of number to string conversion for x-values
void	setXDefaultPrecision (int v)
	default precision for x-labels
void	setXMaxNoExponent (double v)
	x-values above this value will be shown in exponent notation, below in decimal notation
void	setXMinNoExponent (double v)
	x-values below this value will be shown in exponent notation, above in decimal notation
void	setXValueLabelFormat (const QString &v)
	format string for the x-label, use `%1` as placeholder for the numeric value
void	setXYValueLabelFormat (const QString &v)
	format string for the x/y-label, use `%1` as placeholder for the numeric value of x and `%2` for y
void	setYBelowIsZero (double v)
	y-values below this value are treated as exactly 0
void	setYDateTimeFormat (const QString &v)
	format string for datetime -> string conversion of y-value
void	setYDefaultConverter (JKQTPGraphLabelConverterType v)
	type of number to string conversion for y-values
void	setYDefaultPrecision (int v)
	default precision for x-labels
void	setYMaxNoExponent (double v)
	y-values above this value will be shown in exponent notation, below in decimal notation
void	setYMinNoExponent (double v)
	y-values below this value will be shown in exponent notation, above in decimal notation
void	setYValueLabelFormat (const QString &v)
	format string for the y-label, use `%1` as placeholder for the numeric value

Protected Member Functions
QString	generateLabel (double x, double y, int index) const
	generates the label at position (x , y ) and at the given data index
Protected Member Functions inherited from JKQTPXYGraph
int	getDataIndex (int i) const
	returns the index of the i-th datapoint (where i is an index into the SORTED datapoints)
virtual bool	getIndexRange (int &imin, int &imax) const
	determines the range of row indexes available in the data columns of this graph
virtual void	intSortData ()
	sorts data according to the specified criterion in sortData ... The result is stored as a index-map in sorted Indices
Protected Member Functions inherited from JKQTPGraph
virtual void	drawErrorsAfter (JKQTPEnhancedPainter &)
	this function is used to plot error inidcators after plotting the graphs.
virtual void	drawErrorsBefore (JKQTPEnhancedPainter &)
	this function is used to plot error inidcators before plotting the graphs.
bool	getDataMinMax (int column, double &minx, double &maxx, double &smallestGreaterZero)
	get the maximum and minimum value of the given column
Protected Member Functions inherited from JKQTPPlotElement
void	addHitTestData (const HitTestLocation &loc)
	clear the internal datastore for hitTest()
void	addHitTestData (const QPointF &pos_, const QString &label_)
	clear the internal datastore for hitTest()
void	addHitTestData (const QPointF &pos_, int index_, const QString &label_)
	clear the internal datastore for hitTest()
void	addHitTestData (const QPointF &pos_, int index_=-1, const JKQTPDatastore *datastore=nullptr)
	clear the internal datastore for hitTest(), this variant uses formatHitTestDefaultLabel() to auto-generate the label
void	addHitTestData (double x_, double y_, const QString &label_)
	add a new point on the graph to the internal datastore for hitTest()
void	addHitTestData (double x_, double y_, int index_, const QString &label_)
	clear the internal datastore for hitTest()
void	addHitTestData (double x_, double y_, int index_=-1, const JKQTPDatastore *datastore=nullptr)
	add a new point on the graph to the internal datastore for hitTest(), this variant uses formatHitTestDefaultLabel() to auto-generate the label
void	clearHitTestData ()
	clear the internal datastore for hitTest()
virtual QString	formatHitTestDefaultLabel (double x, double y, int index=-1, const JKQTPDatastore *datastore=nullptr) const
	tool-function for hitTest(), which formats a default label, taking into account the x- and y-position (both provided) and optionally the errors of these positions.
void	reserveHitTestData (int points)
	reserve list entries for up to points graph points in the internal datastore for hitTest()
QString	xFloatToString (double v, int past_comma=-1) const
	converts a x-value v into a string, taking into account the type of x-axis
QString	yFloatToString (double v, int past_comma=-1) const
	converts a x-value v into a string, taking into account the type of x-axis
Protected Member Functions inherited from JKQTPGraphValueLabelStyleMixin
LabelGeometry	calcLabelGeometry (JKQTPEnhancedPainter &painter, const QPointF &xDataPixel, const QPointF &xData, const QString &contents, JKQTBasePlotter *parent, double baselineX, double baselineY) const
	calculate everything that is necessary to draw a label, including its box
Protected Member Functions inherited from JKQTPXYLabelsGeneratorMixin
QString	generateDefaultXLabel (double x, double y, int index) const
	default label generator for x-value only
QString	generateDefaultXYLabel (double x, double y, int index) const
	default label generator for x- and y-value
QString	generateDefaultYLabel (double x, double y, int index) const
	default label generator for y-value only
QString	xValToString (double x) const
	converts x to a string, using several of the formatting properties set in this class for x-values
QString	yValToString (double y) const
	converts y to a string, using several of the formatting properties set in this class for y-values

Private Attributes
LabelGenerator	m_labelGenerator
	generate the label for the datapoint at location (x , y ) and being the index -th value in the columns

Additional Inherited Members
Public Slots inherited from JKQTPXYGraph
void	setDataSortOrder (DataSortOrder __value)
	if `!=Unsorted`, the data is sorted before plotting
void	setDataSortOrder (int __value)
	if `!=Unsorted`, the data is sorted before plotting
virtual void	setKeyColumn (int __value)
	sets the column used as "key" for the current graph (typically this call setXColumn(), but for horizontal graphs like filled curves or barcharts it may call setYColumn() )
virtual void	setValueColumn (int __value)
	sets the column used as "value" for the current graph (typically this call setXColumn(), but for horizontal graphs like filled curves or barcharts it may call setYColumn() )
void	setXColumn (int __value)
	the column that contains the x-component of the datapoints
void	setXColumn (size_t __value)
	the column that contains the x-component of the datapoints
void	setXYColumns (int xCol, int yCol)
	sets xColumn and yColumn at the same time
void	setXYColumns (QPair< int, int > xyColPair)
	sets xColumn and yColumn at the same time
void	setXYColumns (QPair< size_t, size_t > xyColPair)
	sets xColumn and yColumn at the same time
void	setXYColumns (size_t xCol, size_t yCol)
	sets xColumn and yColumn at the same time
void	setYColumn (int __value)
	the column that contains the y-component of the datapoints
void	setYColumn (size_t __value)
	the column that contains the y-component of the datapoints
Public Slots inherited from JKQTPPlotElement
void	setHighlighted (bool __value)
	sets whether the graph is drawn in a highlighted style in the plot
virtual void	setTitle (const QString &__value)
	sets the title of the plot (for display in key!).
void	setVisible (bool __value)
	sets whether the graph is visible in the plot
Static Protected Member Functions inherited from JKQTPXYLabelsGeneratorMixin
static QString	valToString (double x, JKQTPGraphLabelConverterType m_xDefaultConverter, int m_xDefaultPrecision, double m_xBelowIsZero, double m_xMinNoExponent, double m_xMaxNoExponent, const QString &m_xDateTimeFormat)
	converts x to a QString, using the provided options
Protected Attributes inherited from JKQTPXYGraph
QVector< int >	sortedIndices
	this array contains the order of indices, in which to access the data in the data columns
Protected Attributes inherited from JKQTPPlotElement
QVector< HitTestLocation >	m_hitTestData
	dataset with graph-points and associated data from the function hitTest()
JKQTBasePlotter *	parent
	the plotter object this object belongs to
int	parentPlotStyle
	internal storage for the used parent plot style
Properties inherited from JKQTPXYGraph
DataSortOrder	sortData
	if `!=Unsorted`, the data is sorted before plotting
int	xColumn
	the column that contains the x-component of the datapoints
int	yColumn
	the column that contains the y-component of the datapoints
Properties inherited from JKQTPPlotElement
bool	highlighted
	indicates whether the graph is shown in a "highlghted" in the plot
QString	title
	title of the plot (for display in key!). If no title is supplied, no key entry is drawn.
bool	visible
	indicates whether the graph is visible in the plot
JKQTPCoordinateAxisRef	xAxisRef
	indicates which coordinate axis to use for coordinate transforms in x-direction
JKQTPCoordinateAxisRef	yAxisRef
	indicates which coordinate axis to use for coordinate transforms in y-direction
Properties inherited from JKQTPGraphValueLabelStyleMixin
bool	drawLabelBoxFrame
double	labelBoxRounding
JKQTPGraphLabelBoxType	labelBoxType
double	labelOffset
double	labelOffsetWithConnector
JKQTPGraphLabelPosition	labelPosition
double	labelXPadding
double	labelYPadding
Properties inherited from JKQTPGraphTextStyleMixin
QColor	textColor
QString	textFontName
double	textFontSize
Properties inherited from JKQTPGraphLineStyleMixin
QColor	highlightingLineColor
QColor	lineColor
Qt::PenStyle	lineStyle
double	lineWidth
Properties inherited from JKQTPGraphFillStyleMixin
QColor	fillColor
Qt::BrushStyle	fillStyle

Detailed Description

This graph plots a series of data labels. This can be used to add number-labels to e.g. a barchart.

Sometimes it is necessary to display the numeric value of a datapoint right in the plot. To achieve this, JKQTPXYGraphLabels is provided, which draws a text-label next to each datapoint in a series of x- and y-values (thus it is derived from JKQTPXYGraph). Each label is drawn with a little offset from the actual datapoint. Under each label, a small (stylable) box is drawn, which is by default simply the same color as the background color of complete plot, but with transparency, thus providing a certain level of contrast to the text, even if drawn above other plot elements. Use the properties of the parent mix-in class JKQTPGraphValueLabelStyleMixin to style the text and the box.

Here is an example of labels together with a bars and lines chart:

Also other styles of boxes are available:

To achieve this, use code like this:

// create barchart and line-chart to display the data:
JKQTPBarVerticalGraph* graph1=new JKQTPBarVerticalGraph(&plot);
graph1->setBarPositionColumn(columnX);
graph1->setBarHeightColumn(columnY);
 
JKQTPXYLineGraph* graph2=new JKQTPXYLineGraph(&plot);
graph2->setXColumn(columnX);
graph2->setYColumn(columnY);
 
// create the data labels:
JKQTPXYGraphLabels* graphLabels=new JKQTPXYGraphLabels(JKQTPXYGraphLabels::YValueLabel, &plot);
graphLabels->setXColumn(graph1->getXColumn());
graphLabels->setYColumn(graph1->getYColumn());
graphLabels->setLabelPosition(JKQTPGLabelAwayFromXAxis),
 
// add the graphs to the plot, so it is actually displayed
plot.addGraph(graph1);
plot.addGraph(graph2);
plot.addGraph(graphLabels);

The text shown in the label is determined by a functor of type JKQTPXYGraphLabels::LabelGenerator that calculates it from the labels position and data-index. This functor can be custimized (set setCustomLabelGenerator() or the matching constructor), or it may be one of three default immplementations, that display:

the current x-value (JKQTPXYGraphLabels::XValueLabel constructor arguent or setDefaultXLabelGenerator() )
the current y-value (JKQTPXYGraphLabels::YValueLabel constructor arguent or setDefaultYLabelGenerator() )
the current x- and y-value (JKQTPXYGraphLabels::XYValueLabel constructor arguent or setDefaultXYLabelGenerator() )

The default generators can be further customized with a series of properties on how to format their output:

setXValueLabelFormat(), setYValueLabelFormat(), setXYValueLabelFormat() ... these set the basic label and are typically only "$%1$" or "$%1/%2$" , but you can set them to any string (%1 / %2 is replaced by the string-converted x-/y-values) and e.g. add a prefix, like setXValueLabelFormat("$x=%1$"). You can use any LaTeX-markup that is allowed by JKQTMathText here!
setXDefaultConverter(), setXDefaultPrecision(), setXBelowIsZero(), ... (all these exist in X and Y variants!)

See also: Example (JKQTPlotter): Simple Graph Labels Example

Member Typedef Documentation

◆ LabelGenerator

typedef std::function<QString(double,double,int)> JKQTPXYGraphLabels::LabelGenerator

type of a functor that generates a label

Member Enumeration Documentation

◆ LabelContentsDefaultType

enum JKQTPXYGraphLabels::LabelContentsDefaultType

Enumerator
XValueLabel	generates a label with the x-coordinate only, calls setDefaultXLabelGenerator()
YValueLabel	generates a label with the y-coordinate only, calls setDefaultYLabelGenerator()
XYValueLabel	generates a label with the x- and y-coordinate, calls setDefaultXYLabelGenerator()

Constructor & Destructor Documentation

◆ JKQTPXYGraphLabels() [1/4]

JKQTPXYGraphLabels::JKQTPXYGraphLabels	(	LabelContentsDefaultType	lt,
		JKQTBasePlotter *	parent = nullptr )

explicit

class constructor, generates a JKQTPXYGraphLabels with one of the default label generator functors (x-value, y-value or x+y-values)

◆ JKQTPXYGraphLabels() [2/4]

JKQTPXYGraphLabels::JKQTPXYGraphLabels	(	LabelContentsDefaultType	lt,
		JKQTPlotter *	parent )

class constructor, generates a JKQTPXYGraphLabels with one of the default label generator functors (x-value, y-value or x+y-values)

◆ JKQTPXYGraphLabels() [3/4]

JKQTPXYGraphLabels::JKQTPXYGraphLabels	(	const LabelGenerator &	lgen,
		JKQTBasePlotter *	parent = nullptr )

class constructor, generates a JKQTPXYGraphLabels with a custom LabelGenerator functor

◆ JKQTPXYGraphLabels() [4/4]

JKQTPXYGraphLabels::JKQTPXYGraphLabels	(	const LabelGenerator &	lgen,
		JKQTPlotter *	parent )

class constructor, generates a JKQTPXYGraphLabels with a custom LabelGenerator functor

Member Function Documentation

◆ draw()

virtual void JKQTPXYGraphLabels::draw ( JKQTPEnhancedPainter & painter )

overridevirtual

plots the graph to the plotter object specified as parent

Implements JKQTPPlotElement.

◆ drawKeyMarker()

virtual void JKQTPXYGraphLabels::drawKeyMarker	(	JKQTPEnhancedPainter &	painter,
		const QRectF &	rect )

overridevirtual

plots a key marker inside the specified rectangle rect

Implements JKQTPPlotElement.

◆ generateLabel()

QString JKQTPXYGraphLabels::generateLabel	(	double	x,
		double	y,
		int	index ) const

protected

generates the label at position (x , y ) and at the given data index

◆ getKeyLabelColor()

virtual QColor JKQTPXYGraphLabels::getKeyLabelColor ( ) const

overridevirtual

returns the color to be used for the key label

Implements JKQTPPlotElement.

◆ getXMinMax()

virtual bool JKQTPXYGraphLabels::getXMinMax	(	double &	minx,
		double &	maxx,
		double &	smallestGreaterZero )

overridevirtual

get the maximum and minimum x-value of the graph

The result is given in the two parameters which are call-by-reference parameters!

Parameters

[out]	minx	minimal x-value used in the graph
[out]	maxx	maximal x-value used in the graph
[out]	smallestGreaterZero	the smalles x-value in the graph, which is larger than 0 (this is used in auto-sizing for logarithmic axes)

Returns: true on success, i.e. if there were datapoints in the plot, or false on failure (e.g. when the graph is empty)

Reimplemented from JKQTPXYGraph.

◆ getYMinMax()

virtual bool JKQTPXYGraphLabels::getYMinMax	(	double &	miny,
		double &	maxy,
		double &	smallestGreaterZero )

overridevirtual

get the maximum and minimum y-value of the graph

The result is given in the two parameters which are call-by-reference parameters!

Parameters

[out]	miny	minimal y-value used in the graph
[out]	maxy	maximal y-value used in the graph
[out]	smallestGreaterZero	the smalles y-value in the graph, which is larger than 0 (this is used in auto-sizing for logarithmic axes)

Returns: true on success, i.e. if there were datapoints in the plot, or false on failure (e.g. when the graph is empty)

Reimplemented from JKQTPXYGraph.

◆ setColor()

void JKQTPXYGraphLabels::setColor	(	QColor	c,
		bool	setTextColor_ = true,
		bool	setFrameColor_ = true )

set color of line and symbol

◆ setCustomLabelGenerator()

void JKQTPXYGraphLabels::setCustomLabelGenerator ( const LabelGenerator & labgen )

sets a custom label geneator function of type LabelGenerator to use

See also: m_labelGenerator, setDefaultXLabelGenerator(), setDefaultYLabelGenerator(), setDefaultXYLabelGenerator()

◆ setDefaultXLabelGenerator()

void JKQTPXYGraphLabels::setDefaultXLabelGenerator ( )

sets the label geneator function to a default implementation, that prints the x-value only

The generator uses m_xValueLabelFormat, m_xDefaultConverter, ...

See also: m_labelGenerator, setCustomLabelGenerator(), setDefaultXLabelGenerator(), setDefaultYLabelGenerator(), setDefaultXYLabelGenerator()

◆ setDefaultXYLabelGenerator()

void JKQTPXYGraphLabels::setDefaultXYLabelGenerator ( )

sets the label geneator function to a default implementation, that prints the x- and y-value

The generator uses m_xyValueLabelFormat, m_xDefaultConverter, m_yDefaultConverter, ...

See also: m_labelGenerator, setCustomLabelGenerator(), setDefaultXLabelGenerator(), setDefaultYLabelGenerator(), setDefaultXYLabelGenerator()

◆ setDefaultYLabelGenerator()

void JKQTPXYGraphLabels::setDefaultYLabelGenerator ( )

sets the label geneator function to a default implementation, that prints the y-value only

The generator uses m_yValueLabelFormat, m_yDefaultConverter, ...

See also: m_labelGenerator, setCustomLabelGenerator(), setDefaultXLabelGenerator(), setDefaultYLabelGenerator(), setDefaultXYLabelGenerator()

Member Data Documentation

◆ m_labelGenerator

LabelGenerator JKQTPXYGraphLabels::m_labelGenerator

private

generate the label for the datapoint at location (x , y ) and being the index -th value in the columns

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

jkqtpgraphlabels.h

Public Types

Public Member Functions

Protected Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ LabelGenerator

Member Enumeration Documentation

◆ LabelContentsDefaultType

Constructor & Destructor Documentation

◆ JKQTPXYGraphLabels() [1/4]

◆ JKQTPXYGraphLabels() [2/4]

◆ JKQTPXYGraphLabels() [3/4]

◆ JKQTPXYGraphLabels() [4/4]

Member Function Documentation

◆ draw()

◆ drawKeyMarker()

◆ generateLabel()

◆ getKeyLabelColor()

◆ getXMinMax()

◆ getYMinMax()

◆ setColor()

◆ setCustomLabelGenerator()

◆ setDefaultXLabelGenerator()

◆ setDefaultXYLabelGenerator()

◆ setDefaultYLabelGenerator()

Member Data Documentation

◆ m_labelGenerator