QChart::addAxis
时间: 2023-09-24 14:09:54 浏览: 179
QChart::addAxis() is a method in the Qt framework's QChart class that adds a new axis to the chart. A chart can have multiple axes that can be used to display different data ranges or series.
The method has two overloads:
1. `void addAxis(QAbstractAxis *axis, Qt::Alignment alignment)`: This overload adds an axis to the chart and sets its position using the `alignment` parameter. The `axis` parameter is a pointer to a QAbstractAxis object, which is an abstract base class for all types of chart axes.
2. `void addAxis(QAbstractAxis *axis)`: This overload adds an axis to the chart but does not specify its position. The position of the axis can be set later using the `QAbstractAxis::setAlignment()` method.
Here's an example of how to use `addAxis()` to add an axis to a chart:
```
QChart *chart = new QChart();
// Create a new value axis
QValueAxis *axisY = new QValueAxis();
axisY->setTitleText("Values");
// Add the axis to the chart and set its position
chart->addAxis(axisY, Qt::AlignLeft);
// Add data to the chart
QLineSeries *series = new QLineSeries();
series->append(0, 1);
series->append(1, 3);
series->append(2, 2);
chart->addSeries(series);
// Assign the axis to the series
series->attachAxis(axisY);
// Show the chart
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
chartView->show();
```
In this example, a new `QValueAxis` is created and added to the chart using the `addAxis()` method. The position of the axis is set to `Qt::AlignLeft`, which aligns the axis with the left side of the chart. A `QLineSeries` is also added to the chart, and the `attachAxis()` method is used to assign the `axisY` to the series. Finally, the chart is displayed using a `QChartView`.