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QCandlestickSeries Class

The QCandlestickSeries class presents data as candlesticks. More...

Header: #include <QCandlestickSeries>
Since: Qt 5.8
Instantiated By: CandlestickSeries
Inherits: QAbstractSeries

Properties

Public Functions

QCandlestickSeries(QObject *parent = nullptr)
~QCandlestickSeries()
bool append(QCandlestickSet *set)
bool append(const QList<QCandlestickSet *> &sets)
bool bodyOutlineVisible() const
qreal bodyWidth() const
QBrush brush() const
bool capsVisible() const
qreal capsWidth() const
void clear()
int count() const
QColor decreasingColor() const
QColor increasingColor() const
bool insert(int index, QCandlestickSet *set)
qreal maximumColumnWidth() const
qreal minimumColumnWidth() const
QPen pen() const
bool remove(QCandlestickSet *set)
bool remove(const QList<QCandlestickSet *> &sets)
void setBodyOutlineVisible(bool bodyOutlineVisible)
void setBodyWidth(qreal bodyWidth)
void setBrush(const QBrush &brush)
void setCapsVisible(bool capsVisible)
void setCapsWidth(qreal capsWidth)
void setDecreasingColor(const QColor &decreasingColor)
void setIncreasingColor(const QColor &increasingColor)
void setMaximumColumnWidth(qreal maximumColumnWidth)
void setMinimumColumnWidth(qreal minimumColumnWidth)
void setPen(const QPen &pen)
QList<QCandlestickSet *> sets() const
bool take(QCandlestickSet *set)

Reimplemented Public Functions

virtual QAbstractSeries::SeriesType type() const

Signals

void bodyOutlineVisibilityChanged()
void bodyWidthChanged()
void brushChanged()
void candlestickSetsAdded(const QList<QCandlestickSet *> &sets)
void candlestickSetsRemoved(const QList<QCandlestickSet *> &sets)
void capsVisibilityChanged()
void capsWidthChanged()
void clicked(QCandlestickSet *set)
void countChanged()
void decreasingColorChanged()
void doubleClicked(QCandlestickSet *set)
void hovered(bool status, QCandlestickSet *set)
void increasingColorChanged()
void maximumColumnWidthChanged()
void minimumColumnWidthChanged()
void penChanged()
void pressed(QCandlestickSet *set)
void released(QCandlestickSet *set)

Additional Inherited Members

  • 1 public slot inherited from QObject
  • 11 static public members inherited from QObject
  • 9 protected functions inherited from QObject

Detailed Description

The QCandlestickSeries class presents data as candlesticks.

This class acts as a container for single candlestick items. Each item is drawn to its own category when using QBarCategoryAxis. QDateTimeAxis and QValueAxis can be used as alternatives to QBarCategoryAxis. In this case, each candlestick item is drawn according to its timestamp value.

Note: The timestamps must be unique within a QCandlestickSeries. When using QBarCategoryAxis, only the first one of the candlestick items sharing a timestamp is drawn. If the chart includes multiple instances of QCandlestickSeries, items from different series sharing a timestamp are drawn to the same category. When using QValueAxis or QDateTimeAxis, candlestick items sharing a timestamp will overlap each other.

See the candlestick chart example to learn how to create a candlestick chart.

See also QCandlestickSet, QBarCategoryAxis, QDateTimeAxis, and QValueAxis.

Property Documentation

bodyOutlineVisible : bool

This property holds the visibility of the candlestick body outline.

Access functions:

bool bodyOutlineVisible() const
void setBodyOutlineVisible(bool bodyOutlineVisible)

Notifier signal:

void bodyOutlineVisibilityChanged()

bodyWidth : qreal

This property holds the relative width of the candlestick item within its own slot, in the range from 0.0 to 1.0.

Values outside this range are clamped to 0.0 or 1.0.

Access functions:

qreal bodyWidth() const
void setBodyWidth(qreal bodyWidth)

Notifier signal:

void bodyWidthChanged()

brush : QBrush

This property holds the brush used to fill the candlestick items.

Access functions:

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

Notifier signal:

void brushChanged()

capsVisible : bool

This property holds the visibility of the caps.

Access functions:

bool capsVisible() const
void setCapsVisible(bool capsVisible)

Notifier signal:

void capsVisibilityChanged()

capsWidth : qreal

This property holds the relative width of the caps within a candlestick, in the range from 0.0 to 1.0.

Values outside this range are clamped to 0.0 or 1.0.

Access functions:

qreal capsWidth() const
void setCapsWidth(qreal capsWidth)

Notifier signal:

void capsWidthChanged()

count : const int

This property holds the number of candlestick items in a series.

Access functions:

int count() const

Notifier signal:

void countChanged()

decreasingColor : QColor

This property holds the color of the decreasing candlestick item body.

A candlestick is decreasing when its open value is higher than the close value. By default, this property is set to the brush color with the alpha channel set to 128. The default color is used also when the property is set to an invalid color value.

Access functions:

QColor decreasingColor() const
void setDecreasingColor(const QColor &decreasingColor)

Notifier signal:

void decreasingColorChanged()

increasingColor : QColor

This property holds the color of the increasing candlestick item body.

A candlestick is increasing when its close value is higher than the open value. By default, this property is set to the brush color. The default color is used also when the property is set to an invalid color value.

Access functions:

QColor increasingColor() const
void setIncreasingColor(const QColor &increasingColor)

Notifier signal:

void increasingColorChanged()

maximumColumnWidth : qreal

This property holds the maximum width of the candlestick items in pixels. Setting a negative value means there is no maximum width. All negative values are converted to -1.0.

Access functions:

qreal maximumColumnWidth() const
void setMaximumColumnWidth(qreal maximumColumnWidth)

Notifier signal:

void maximumColumnWidthChanged()

minimumColumnWidth : qreal

This property holds the minimum width of the candlestick items in pixels. Setting a negative value means there is no minimum width. All negative values are converted to -1.0.

Access functions:

qreal minimumColumnWidth() const
void setMinimumColumnWidth(qreal minimumColumnWidth)

Notifier signal:

void minimumColumnWidthChanged()

pen : QPen

This property holds the pen used to draw the lines of the candlestick items.

Access functions:

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

Notifier signal:

void penChanged()

Member Function Documentation

QCandlestickSeries::QCandlestickSeries(QObject *parent = nullptr)

Constructs an empty QCandlestickSeries. The parent is optional.

QCandlestickSeries::~QCandlestickSeries()

Destroys the series. Removes the series from the chart.

bool QCandlestickSeries::append(QCandlestickSet *set)

Adds a single candlestick item specified by set to the series and takes ownership of it. If the item is null or it is already in the series, it is not appended. Returns true if appending succeeded, false otherwise.

bool QCandlestickSeries::append(const QList<QCandlestickSet *> &sets)

Adds a list of candlestick items specified by sets to the series and takes ownership of it. If any of the items are null, already belong to the series, or appear in the list more than once, nothing is appended. Returns true if all items were appended successfully, false otherwise.

[signal] void QCandlestickSeries::bodyOutlineVisibilityChanged()

This signal is emitted when the visibility of the candlestick item body outline changes.

Note: Notifier signal for property bodyOutlineVisible.

See also bodyOutlineVisible.

[signal] void QCandlestickSeries::bodyWidthChanged()

This signal is emitted when the candlestick item width changes.

Note: Notifier signal for property bodyWidth.

See also bodyWidth.

[signal] void QCandlestickSeries::brushChanged()

This signal is emitted when the candlestick item brush changes.

Note: Notifier signal for property brush.

See also brush.

[signal] void QCandlestickSeries::candlestickSetsAdded(const QList<QCandlestickSet *> &sets)

This signal is emitted when the candlestick items specified by sets are added to the series.

[signal] void QCandlestickSeries::candlestickSetsRemoved(const QList<QCandlestickSet *> &sets)

This signal is emitted when the candlestick items specified by sets are removed from the series.

[signal] void QCandlestickSeries::capsVisibilityChanged()

This signal is emitted when the visibility of the candlestick item caps changes.

Note: Notifier signal for property capsVisible.

See also capsVisible.

[signal] void QCandlestickSeries::capsWidthChanged()

This signal is emitted when the candlestick item caps width changes.

Note: Notifier signal for property capsWidth.

See also capsWidth.

void QCandlestickSeries::clear()

Removes all candlestick items from the series and permanently deletes them.

[signal] void QCandlestickSeries::clicked(QCandlestickSet *set)

This signal is emitted when the candlestick item specified by set is clicked on the chart.

int QCandlestickSeries::count() const

Returns the number of the candlestick items in the series.

Note: Getter function for property count.

[signal] void QCandlestickSeries::countChanged()

This signal is emitted when the number of candlestick items in the series changes.

Note: Notifier signal for property count.

See also count.

[signal] void QCandlestickSeries::decreasingColorChanged()

This signal is emitted when the candlestick item decreasing color changes.

Note: Notifier signal for property decreasingColor.

See also decreasingColor.

[signal] void QCandlestickSeries::doubleClicked(QCandlestickSet *set)

This signal is emitted when the candlestick item specified by set is double-clicked on the chart.

[signal] void QCandlestickSeries::hovered(bool status, QCandlestickSet *set)

This signal is emitted when a mouse is hovered over the candlestick item specified by set in a chart.

When the mouse moves over the item, status turns true, and when the mouse moves away again, it turns false.

[signal] void QCandlestickSeries::increasingColorChanged()

This signal is emitted when the candlestick item increasing color changes.

Note: Notifier signal for property increasingColor.

See also increasingColor.

bool QCandlestickSeries::insert(int index, QCandlestickSet *set)

Inserts the candlestick item specified by set to the series at the position specified by index. Takes ownership of the item. If the item is null or already belongs to the series, it is not inserted. Returns true if inserting succeeded, false otherwise.

[signal] void QCandlestickSeries::maximumColumnWidthChanged()

This signal is emitted when there is a change in the maximum column width of candlestick items.

Note: Notifier signal for property maximumColumnWidth.

See also maximumColumnWidth.

[signal] void QCandlestickSeries::minimumColumnWidthChanged()

This signal is emitted when there is a change in the minimum column width of candlestick items.

Note: Notifier signal for property minimumColumnWidth.

See also minimumColumnWidth.

[signal] void QCandlestickSeries::penChanged()

This signal is emitted when the candlestick item pen changes.

Note: Notifier signal for property pen.

See also pen.

[signal] void QCandlestickSeries::pressed(QCandlestickSet *set)

This signal is emitted when the user clicks the candlestick item specified by set and holds down the mouse button.

[signal] void QCandlestickSeries::released(QCandlestickSet *set)

This signal is emitted when the user releases the mouse press on the candlestick item specified by set.

bool QCandlestickSeries::remove(QCandlestickSet *set)

Removes a single candlestick item, specified by set, from the series. Returns true if the item is successfully deleted, false otherwise.

bool QCandlestickSeries::remove(const QList<QCandlestickSet *> &sets)

Removes a list of candlestick items specified by sets from the series. If any of the items are null, were already removed from the series, or appear in the list more than once, nothing is removed. Returns true if all items were removed successfully, false otherwise.

QList<QCandlestickSet *> QCandlestickSeries::sets() const

Returns the list of candlestick items in the series. Ownership of the items does not change.

bool QCandlestickSeries::take(QCandlestickSet *set)

Takes a single candlestick item, specified by set, from the series. Does not delete the item. Returns true if the take operation was successful, false otherwise.

Note: The series remains the item's parent object. You must set the parent object to take full ownership.

[virtual] QAbstractSeries::SeriesType QCandlestickSeries::type() const

Reimplemented from QAbstractSeries::type().

Returns the type of the series (QAbstractSeries::SeriesTypeCandlestick).

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