QPieSeries Class

成员函数

QPieSeries::QPieSeries(QObject *parent = Q_NULLPTR)

Constructs a series object that is a child of parent.

[virtual] QPieSeries::~QPieSeries()

Removes the pie series and its slices.

[signal] void QPieSeries::added(QList<QPieSlice *> slices)

This signal is emitted when the slices specified by slices are added to the series.

参见 append() and insert().

bool QPieSeries::append(QPieSlice *slice)

Appends the slice specified by slice to the series. Slice ownership is passed to the series.

Returns true if appending succeeds.

bool QPieSeries::append(QList<QPieSlice *> slices)

Appends the array of slices specified by slices to the series. Slice ownership is passed to the series.

Returns true if appending succeeds.

QPieSlice *QPieSeries::append(QString label, qreal value)

Appends a single slice with the specified value and label to the series. Slice ownership is passed to the series. Returns null if value is NaN, Inf, or -Inf and adds nothing to the series.

void QPieSeries::clear()

Clears all slices from the series.

[signal] void QPieSeries::clicked(QPieSlice *slice)

This signal is emitted when the slice specified by slice is clicked.

参见 QPieSlice::clicked().

int QPieSeries::count() const

Returns the number of the slices in this series.

Note: Getter function for property count.

[signal] void QPieSeries::countChanged()

This signal is emitted when the slice count changes.

Note: Notifier signal for property count.

参见 count.

[signal] void QPieSeries::doubleClicked(QPieSlice *slice)

This signal is emitted when the slice specified by slice is double-clicked.

参见 QPieSlice::doubleClicked().

[signal] void QPieSeries::hovered(QPieSlice *slice, bool state)

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

参见 QPieSlice::hovered().

bool QPieSeries::insert(int index, QPieSlice *slice)

Inserts the slice specified by slice to the series before the slice at the position specified by index. Slice ownership is passed to the series.

Returns true if inserting succeeds.

bool QPieSeries::isEmpty() const

Returns true if the series is empty.

qreal QPieSeries::pieEndAngle() const

Returns the end angle of the pie.

A full pie is 360 degrees, where 0 degrees is at 12 a'clock.

Note: Getter function for property endAngle.

参见 setPieEndAngle(), pieStartAngle(), and setPieStartAngle().

[signal] void QPieSeries::pressed(QPieSlice *slice)

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

参见 QPieSlice::pressed().

[signal] void QPieSeries::released(QPieSlice *slice)

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

参见 QPieSlice::released().

bool QPieSeries::remove(QPieSlice *slice)

Removes a single slice, specified by slice, from the series and deletes it permanently.

The pointer cannot be referenced after this call.

Returns true if the removal succeeds.

[signal] void QPieSeries::removed(QList<QPieSlice *> slices)

This signal is emitted when the slices specified by slices are removed from the series.

参见 remove().

void QPieSeries::setLabelsPosition(QPieSlice::LabelPosition position)

Sets the position of all the slice labels to position.

Note: This function affects only the current slices in the series. If a new slice is added, the default label position is QPieSlice::LabelOutside.

参见 QPieSlice::labelPosition() and QPieSlice::setLabelPosition().

void QPieSeries::setLabelsVisible(bool visible = true)

Sets the visibility of all slice labels to visible.

Note: This function affects only the current slices in the series. If a new slice is added, the default label visibility is false.

参见 QPieSlice::isLabelVisible() and QPieSlice::setLabelVisible().

void QPieSeries::setPieEndAngle(qreal angle)

Sets the end angle of the pie.

A full pie is 360 degrees, where 0 degrees is at 12 a'clock.

angle must be greater than the start angle.

Note: Setter function for property endAngle.

参见 pieEndAngle(), pieStartAngle(), and setPieStartAngle().

QList<QPieSlice *> QPieSeries::slices() const

Returns a list of slices that belong to this series.

qreal QPieSeries::sum() const

Returns the sum of all slice values in this series.

Note: Getter function for property sum.

参见 QPieSlice::value(), QPieSlice::setValue(), and QPieSlice::percentage().

[signal] void QPieSeries::sumChanged()

This signal is emitted when the sum of all slices changes.

Note: Notifier signal for property sum.

参见 sum.

bool QPieSeries::take(QPieSlice *slice)

Takes a single slice, specified by slice, from the series. Does not delete the slice object.

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

Returns true if the take operation was successful.

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

Reimplemented from QAbstractSeries::type().

Returns the type of the series.

QPieSeries &QPieSeries::operator<<(QPieSlice *slice)

Appends the slice specified by slice to the series and returns a reference to the series. Slice ownership is passed to the series.