QPieSlice Class

The QPieSlice class represents a single slice in a pie series. More...

Header:	#include <QPieSlice>
Instantiated By:	PieSlice
Inherits:	QObject

List of all members, including inherited members

Public Types

enum	LabelPosition { LabelOutside, LabelInsideHorizontal, LabelInsideTangential, LabelInsideNormal }

Properties

angleSpan : const qreal
borderColor : QColor
borderWidth : int
brush : QBrush
color : QColor
explodeDistanceFactor : qreal
exploded : bool
label : QString
labelArmLengthFactor : qreal

labelBrush : QBrush
labelColor : QColor
labelFont : QFont
labelPosition : LabelPosition
labelVisible : bool
pen : QPen
percentage : const qreal
startAngle : const qreal
value : qreal

Public Functions

	QPieSlice(QString label, qreal value, QObject *parent = nullptr)
	QPieSlice(QObject *parent = nullptr)
virtual	~QPieSlice()
qreal	angleSpan() const
QColor	borderColor()
int	borderWidth()
QBrush	brush() const
QColor	color()
qreal	explodeDistanceFactor() const
bool	isExploded() const
bool	isLabelVisible() const
QString	label() const
qreal	labelArmLengthFactor() const
QBrush	labelBrush() const
QColor	labelColor()
QFont	labelFont() const
QPieSlice::LabelPosition	labelPosition()
QPen	pen() const
qreal	percentage() const
QPieSeries *	series() const
void	setBorderColor(QColor color)
void	setBorderWidth(int width)
void	setBrush(const QBrush &brush)
void	setColor(QColor color)
void	setExplodeDistanceFactor(qreal factor)
void	setExploded(bool exploded = true)
void	setLabel(QString label)
void	setLabelArmLengthFactor(qreal factor)
void	setLabelBrush(const QBrush &brush)
void	setLabelColor(QColor color)
void	setLabelFont(const QFont &font)
void	setLabelPosition(QPieSlice::LabelPosition position)
void	setLabelVisible(bool visible = true)
void	setPen(const QPen &pen)
void	setValue(qreal value)
qreal	startAngle() const
qreal	value() const

Signals

void	angleSpanChanged()
void	borderColorChanged()
void	borderWidthChanged()
void	brushChanged()
void	clicked()
void	colorChanged()
void	doubleClicked()
void	hovered(bool state)
void	labelBrushChanged()
void	labelChanged()
void	labelColorChanged()
void	labelFontChanged()
void	labelVisibleChanged()
void	penChanged()
void	percentageChanged()
void	pressed()
void	released()
void	startAngleChanged()
void	valueChanged()

Detailed Description

A pie slice has a value and a label. When the slice is added to a pie series, the QPieSeries object calculates the percentage of the slice compared with the sum of all slices in the series to determine the actual size of the slice in the chart.

By default, the label is hidden. If it is visible, it can be either located outside the slice and connected to it with an arm or centered inside the slice either horizontally or in parallel with the tangential or normal of the slice's arc.

By default, the visual appearance of the slice is set by a theme, but the theme can be overridden by specifying slice properties. However, if the theme is changed after the slices are customized, all customization will be lost.

To enable user interaction with the pie chart, some basic signals are emitted when users click pie slices or hover the mouse over them.

See also QPieSeries.

Member Type Documentation

enum QPieSlice::LabelPosition

This enum describes the position of the slice label.

Constant	Value	Description
`QPieSlice::LabelOutside`	`0`	The label is located outside the slice connected to it with an arm. This is the default value.
`QPieSlice::LabelInsideHorizontal`	`1`	The label is centered within the slice and laid out horizontally.
`QPieSlice::LabelInsideTangential`	`2`	The label is centered within the slice and rotated to be parallel with the tangential of the slice's arc.
`QPieSlice::LabelInsideNormal`	`3`	The label is centered within the slice and rotated to be parallel with the normal of the slice's arc.

Property Documentation

`[read-only]` angleSpan : const qreal

This property holds the span of the slice in degrees. A full pie is 360 degrees, where 0 degrees is at 12 a'clock. Updated automatically once the slice is added to the series.

Access functions:

qreal angleSpan() const

Notifier signal:

void	angleSpanChanged()

borderColor : QColor

This property holds the color used to draw the slice border. This is a convenience property for modifying the slice pen.

Access functions:

QColor	borderColor()
void	setBorderColor(QColor color)

Notifier signal:

void	borderColorChanged()

See also pen and borderWidth.

borderWidth : int

This property holds the width of the slice border. This is a convenience property for modifying the slice pen.

Access functions:

int	borderWidth()
void	setBorderWidth(int width)

Notifier signal:

void	borderWidthChanged()

See also pen and borderColor.

brush : QBrush

This property holds the brush used to fill the slice.

Access functions:

QBrush	brush() const
void	setBrush(const QBrush &brush)

Notifier signal:

void	brushChanged()

color : QColor

This property holds the fill (brush) color of the slice. This is a convenience property for modifying the slice brush.

Access functions:

QColor	color()
void	setColor(QColor color)

Notifier signal:

void	colorChanged()

See also brush.

explodeDistanceFactor : qreal

Determines how far away from the pie the slice is exploded.

1.0 means that the distance is the same as the radius.
0.5 means that the distance is half of the radius.

By default, the distance is 0.15

Access functions:

qreal	explodeDistanceFactor() const
void	setExplodeDistanceFactor(qreal factor)

See also exploded.

exploded : bool

This property holds whether the slice is separated from the pie.

Access functions:

bool	isExploded() const
void	setExploded(bool exploded = true)

See also explodeDistanceFactor.

label : QString

This property holds the label of the slice.

Note: The string can be HTML formatted.

Access functions:

QString	label() const
void	setLabel(QString label)

Notifier signal:

void	labelChanged()

See also labelVisible, labelBrush, labelFont, and labelArmLengthFactor.

labelArmLengthFactor : qreal

This property holds the length of the label arm. The factor is relative to the pie radius. For example:

1.0 means that the length is the same as the radius.
0.5 means that the length is half of the radius.

By default, the arm length is 0.15

Access functions:

qreal	labelArmLengthFactor() const
void	setLabelArmLengthFactor(qreal factor)

See also label, labelVisible, labelBrush, and labelFont.

labelBrush : QBrush

This property holds the brush used to draw the label and label arm of the slice.

Access functions:

QBrush	labelBrush() const
void	setLabelBrush(const QBrush &brush)

Notifier signal:

void	labelBrushChanged()

See also label, labelVisible, labelFont, and labelArmLengthFactor.

labelColor : QColor

This property holds the color used to draw the slice label. This is a convenience property for modifying the slice label brush.

Access functions:

QColor	labelColor()
void	setLabelColor(QColor color)

Notifier signal:

void	labelColorChanged()

See also labelBrush.

labelFont : QFont

This property holds the font used for drawing the label text.

Access functions:

QFont	labelFont() const
void	setLabelFont(const QFont &font)

Notifier signal:

void	labelFontChanged()

See also label, labelVisible, and labelArmLengthFactor.

labelPosition : LabelPosition

This property holds the position of the slice label.

Access functions:

QPieSlice::LabelPosition	labelPosition()
void	setLabelPosition(QPieSlice::LabelPosition position)

See also label and labelVisible.

labelVisible : bool

This property holds the visibility of the slice label. By default, the label is not visible.

Access functions:

bool	isLabelVisible() const
void	setLabelVisible(bool visible = true)

Notifier signal:

void	labelVisibleChanged()

See also label, labelBrush, labelFont, and labelArmLengthFactor.

pen : QPen

This property holds the pen used to draw the slice border.

Access functions:

QPen	pen() const
void	setPen(const QPen &pen)

Notifier signal:

void	penChanged()

`[read-only]` percentage : const qreal

This property holds the percentage of the slice compared to the sum of all slices in the series. The actual value ranges from 0.0 to 1.0. Updated automatically once the slice is added to the series.

Access functions:

qreal percentage() const

Notifier signal:

void	percentageChanged()

See also value and QPieSeries::sum.

`[read-only]` startAngle : const qreal

This property holds the starting angle of this slice in the series it belongs to. A full pie is 360 degrees, where 0 degrees is at 12 a'clock. Updated automatically once the slice is added to the series.

Access functions:

qreal startAngle() const

Notifier signal:

void	startAngleChanged()

value : qreal

This property holds the value of the slice.

Note: A negative value is converted to a positive value.

Access functions:

qreal	value() const
void	setValue(qreal value)

Notifier signal:

void	valueChanged()

See also percentage() and QPieSeries::sum().

Member Function Documentation

QPieSlice::QPieSlice(QString label, qreal value, QObject **parent* = nullptr)

Constructs an empty slice with the specified value, label, and parent.

See also QPieSeries::append() and QPieSeries::insert().

QPieSlice::QPieSlice(QObject **parent* = nullptr)

Constructs an empty slice with the parent parent.

See also QPieSeries::append() and QPieSeries::insert().

`[signal]` void QPieSlice::angleSpanChanged()

This signal is emitted when the angle span of the slice changes.

Note: Notifier signal for property angleSpan.

See also angleSpan.

`[signal]` void QPieSlice::borderColorChanged()

This signal is emitted when the slice border color changes.

Note: Notifier signal for property borderColor.

See also pen and borderColor.

`[signal]` void QPieSlice::borderWidthChanged()

This signal is emitted when the slice border width changes.

Note: Notifier signal for property borderWidth.

See also pen and borderWidth.

`[signal]` void QPieSlice::brushChanged()

This signal is emitted when the brush used to fill the slice changes.

Note: Notifier signal for property brush.

See also brush.

`[signal]` void QPieSlice::clicked()

This signal is emitted when the slice is clicked.

See also QPieSeries::clicked().

`[signal]` void QPieSlice::colorChanged()

This signal is emitted when the slice color changes.

Note: Notifier signal for property color.

See also brush.

`[signal]` void QPieSlice::doubleClicked()

This signal is emitted when user double-clicks the slice.

See also QPieSeries::doubleClicked().

`[signal]` void QPieSlice::hovered(bool state)

This signal is emitted when a mouse is hovered over the slice. When the mouse moves over the slice, state turns true, and when the mouse moves away again, it turns false.

See also QPieSeries::hovered().

`[signal]` void QPieSlice::labelBrushChanged()

This signal is emitted when the label brush of the slice changes.

Note: Notifier signal for property labelBrush.

See also labelBrush.

`[signal]` void QPieSlice::labelChanged()

This signal is emitted when the slice label changes.

Note: Notifier signal for property label.

See also label.

`[signal]` void QPieSlice::labelColorChanged()

This signal is emitted when the slice label color changes.

Note: Notifier signal for property labelColor.

See also labelColor.

`[signal]` void QPieSlice::labelFontChanged()

This signal is emitted when the label font of the slice changes.

Note: Notifier signal for property labelFont.

See also labelFont.

`[signal]` void QPieSlice::labelVisibleChanged()

This signal is emitted when the visibility of the slice label changes.

Note: Notifier signal for property labelVisible.

See also labelVisible.

`[signal]` void QPieSlice::penChanged()

This signal is emitted when the pen used to draw the slice border changes.

Note: Notifier signal for property pen.

See also pen.

`[signal]` void QPieSlice::percentageChanged()

This signal is emitted when the percentage of the slice changes.

Note: Notifier signal for property percentage.

See also percentage.

`[signal]` void QPieSlice::pressed()

This signal is emitted when the user clicks the slice and holds down the mouse button.

See also QPieSeries::pressed().

`[signal]` void QPieSlice::released()

This signal is emitted when the user releases the mouse press on the slice.

See also QPieSeries::released().

`[signal]` void QPieSlice::startAngleChanged()

This signal is emitted when the starting angle of the slice changes.

Note: Notifier signal for property startAngle.

See also startAngle.

`[signal]` void QPieSlice::valueChanged()

This signal is emitted when the slice value changes.

Note: Notifier signal for property value.

See also value.

`[virtual]` QPieSlice::~QPieSlice()

Removes the slice. The slice should not be removed if it has been added to a series.

QPieSeries *QPieSlice::series() const

Returns the series that this slice belongs to.

See also QPieSeries::append().

Contents

QPieSlice Class

Public Types

Properties

Public Functions

Signals

Detailed Description

Member Type Documentation

enum QPieSlice::LabelPosition

Property Documentation

[read-only] angleSpan : const qreal

borderColor : QColor

borderWidth : int

brush : QBrush

color : QColor

explodeDistanceFactor : qreal

exploded : bool

label : QString

labelArmLengthFactor : qreal

labelBrush : QBrush

labelColor : QColor

labelFont : QFont

labelPosition : LabelPosition

labelVisible : bool

pen : QPen

[read-only] percentage : const qreal

[read-only] startAngle : const qreal

value : qreal

Member Function Documentation

QPieSlice::QPieSlice(QString label, qreal value, QObject *parent = nullptr)

QPieSlice::QPieSlice(QObject *parent = nullptr)

[signal] void QPieSlice::angleSpanChanged()

[signal] void QPieSlice::borderColorChanged()

[signal] void QPieSlice::borderWidthChanged()

[signal] void QPieSlice::brushChanged()

[signal] void QPieSlice::clicked()

[signal] void QPieSlice::colorChanged()

[signal] void QPieSlice::doubleClicked()

[signal] void QPieSlice::hovered(bool state)

[signal] void QPieSlice::labelBrushChanged()

[signal] void QPieSlice::labelChanged()

[signal] void QPieSlice::labelColorChanged()

[signal] void QPieSlice::labelFontChanged()

[signal] void QPieSlice::labelVisibleChanged()

[signal] void QPieSlice::penChanged()

[signal] void QPieSlice::percentageChanged()

[signal] void QPieSlice::pressed()

[signal] void QPieSlice::released()

[signal] void QPieSlice::startAngleChanged()

[signal] void QPieSlice::valueChanged()

[virtual] QPieSlice::~QPieSlice()

QPieSeries *QPieSlice::series() const

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`[read-only]` angleSpan : const qreal

`[read-only]` percentage : const qreal

`[read-only]` startAngle : const qreal

QPieSlice::QPieSlice(QString label, qreal value, QObject **parent* = nullptr)

QPieSlice::QPieSlice(QObject **parent* = nullptr)

`[signal]` void QPieSlice::angleSpanChanged()

`[signal]` void QPieSlice::borderColorChanged()

`[signal]` void QPieSlice::borderWidthChanged()

`[signal]` void QPieSlice::brushChanged()

`[signal]` void QPieSlice::clicked()

`[signal]` void QPieSlice::colorChanged()

`[signal]` void QPieSlice::doubleClicked()

`[signal]` void QPieSlice::hovered(bool state)

`[signal]` void QPieSlice::labelBrushChanged()

`[signal]` void QPieSlice::labelChanged()

`[signal]` void QPieSlice::labelColorChanged()

`[signal]` void QPieSlice::labelFontChanged()

`[signal]` void QPieSlice::labelVisibleChanged()

`[signal]` void QPieSlice::penChanged()

`[signal]` void QPieSlice::percentageChanged()

`[signal]` void QPieSlice::pressed()

`[signal]` void QPieSlice::released()

`[signal]` void QPieSlice::startAngleChanged()

`[signal]` void QPieSlice::valueChanged()

`[virtual]` QPieSlice::~QPieSlice()