范例展示如何使用 QLogValueAxis .
要运行范例从 Qt Creator ,打开 欢迎 模式,然后选择范例从 范例 。更多信息,拜访 构建和运行范例 .
创建 QLineSeries instance and add some data to it.
QLineSeries *series = new QLineSeries(); *series << QPointF(1.0, 1.0) << QPointF(2.0, 73.0) << QPointF(3.0, 268.0) << QPointF(4.0, 17.0) << QPointF(5.0, 4325.0) << QPointF(6.0, 723.0);
To present the data on the chart we need a QChart instance. Add the series to it, hide the legend and set the title of the chart.
QChart *chart = new QChart(); chart->addSeries(series); chart->legend()->hide(); chart->setTitle("Logarithmic axis example");
Create the axes. Add them to the chart and attach to the series.
QValueAxis *axisX = new QValueAxis(); axisX->setTitleText("Data point"); axisX->setLabelFormat("%i"); axisX->setTickCount(series->count()); chart->addAxis(axisX, Qt::AlignBottom); series->attachAxis(axisX); QLogValueAxis *axisY = new QLogValueAxis(); axisY->setTitleText("Values"); axisY->setLabelFormat("%g"); axisY->setBase(8.0); axisY->setMinorTickCount(-1); chart->addAxis(axisY, Qt::AlignLeft); series->attachAxis(axisY);
Then create a QChartView 对象采用 QChart as a parameter. Enable antialiasing to have the rendered line look nicer.
QChartView *chartView = new QChartView(chart); chartView->setRenderHint(QPainter::Antialiasing);
图表展示就绪。
QMainWindow window; window.setCentralWidget(chartView); window.resize(800, 600); window.show();