QValueAxis Class
The QValueAxis class adds values to a chart's axes. 更多...
| 头文件: | #include <QValueAxis> |
| Instantiated By: | ValueAxis |
| 基类: | QAbstractAxis |
| 派生类: |
属性
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- 27 个属性继承自 QAbstractAxis
- 1 个属性继承自 QObject
公有函数
| QValueAxis(QObject *parent = Q_NULLPTR) | |
| ~QValueAxis() | |
| QString | labelFormat() const |
| qreal | max() const |
| qreal | min() const |
| int | minorTickCount() const |
| void | setLabelFormat(const QString &format) |
| void | setMax(qreal max) |
| void | setMin(qreal min) |
| void | setMinorTickCount(int count) |
| void | setRange(qreal min, qreal max) |
| void | setTickCount(int count) |
| int | tickCount() const |
重新实现的公有函数
| virtual AxisType | type() const |
- 58 个公有函数继承自 QAbstractAxis
- 32 个公有函数继承自 QObject
公有槽函数
| void | applyNiceNumbers() |
- 1 个公有槽函数继承自 QObject
信号
| void | labelFormatChanged(const QString &format) |
| void | maxChanged(qreal max) |
| void | minChanged(qreal min) |
| void | minorTickCountChanged(int minorTickCount) |
| void | rangeChanged(qreal min, qreal max) |
| void | tickCountChanged(int tickCount) |
- 25 个信号继承自 QAbstractAxis
- 2 个信号继承自 QObject
其他继承的成员
详细描述
The QValueAxis class adds values to a chart's axes.
A value axis can be set up to show an axis line with tick marks, grid lines, and shades. The values on the axis are drawn at the positions of tick marks.
The following example code illustrates how to use the QValueAxis class:
QChartView *chartView = new QChartView; QLineSeries *series = new QLineSeries; // ... chartView->chart()->addSeries(series); QValueAxis *axisX = new QValueAxis; axisX->setRange(10, 20.5); axisX->setTickCount(10); axisX->setLabelFormat("%.2f"); chartView->chart()->setAxisX(axisX, series);
属性
labelFormat : QString
This property holds the label format of the axis.
The format string supports the following conversion specifiers, length modifiers, and flags provided by printf() in the standard C++ library: d, i, o, x, X, f, F, e, E, g, G, c.
If QChart::localizeNumbers is true, the supported specifiers are limited to: d, e, E, f, g, G, and i. Also, only the precision modifier is supported. The rest of the formatting comes from the default QLocale of the application.
访问函数:
| QString | labelFormat() const |
| void | setLabelFormat(const QString &format) |
Notifier signal:
| void | labelFormatChanged(const QString &format) |
参见 QString::asprintf().
max : qreal
This property holds the maximum value on the axis.
When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid.
访问函数:
| qreal | max() const |
| void | setMax(qreal max) |
Notifier signal:
| void | maxChanged(qreal max) |
min : qreal
This property holds the minimum value on the axis.
When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid.
访问函数:
| qreal | min() const |
| void | setMin(qreal min) |
Notifier signal:
| void | minChanged(qreal min) |
minorTickCount : int
This property holds the number of minor tick marks on the axis. This indicates how many grid lines are drawn between major ticks on the chart. Labels are not drawn for minor ticks. The default value is 0.
访问函数:
| int | minorTickCount() const |
| void | setMinorTickCount(int count) |
Notifier signal:
| void | minorTickCountChanged(int minorTickCount) |
tickCount : int
This property holds the number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. The default value is 5, and the number cannot be less than 2.
访问函数:
| int | tickCount() const |
| void | setTickCount(int count) |
Notifier signal:
| void | tickCountChanged(int tickCount) |
成员函数
QValueAxis::QValueAxis(QObject *parent = Q_NULLPTR)
Constructs an axis object that is a child of parent.
QValueAxis::~QValueAxis()
Destroys the object.
[slot] void QValueAxis::applyNiceNumbers()
Modifies the current range and number of tick marks on the axis to look nice. The algorithm considers numbers that can be expressed as a form of 1*10^n, 2* 10^n, or 5*10^n to be nice numbers. These numbers are used for setting spacing for the tick marks.
参见 setRange() and setTickCount().
[signal] void QValueAxis::labelFormatChanged(const QString &format)
This signal is emitted when the format of axis labels changes.
Note: Notifier signal for property labelFormat.
[signal] void QValueAxis::maxChanged(qreal max)
This signal is emitted when the maximum value of the axis, specified by max, changes.
Note: Notifier signal for property max.
[signal] void QValueAxis::minChanged(qreal min)
This signal is emitted when the minimum value of the axis, specified by min, changes.
Note: Notifier signal for property min.
[signal] void QValueAxis::minorTickCountChanged(int minorTickCount)
This signal is emitted when the number of minor tick marks on the axis, specified by minorTickCount, changes.
Note: Notifier signal for property minorTickCount.
[signal] void QValueAxis::rangeChanged(qreal min, qreal max)
This signal is emitted when the minimum or maximum value of the axis, specified by min and max, changes.
void QValueAxis::setRange(qreal min, qreal max)
Sets the range from min to max on the axis. If min is greater than max, this function returns without making any changes.
[signal] void QValueAxis::tickCountChanged(int tickCount)
This signal is emitted when the number of tick marks on the axis, specified by tickCount, changes.
Note: Notifier signal for property tickCount.
[virtual] AxisType QValueAxis::type() const
Reimplemented from QAbstractAxis::type().
Returns the type of the axis.