使用对数值轴

创建QLineSeries 实例并添加一些数据。

auto 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);

要在图表中显示数据，我们需要一个QChart 实例。向其中添加序列，隐藏图例并设置图表标题。

auto chart = new QChart;
chart->addSeries(series);
chart->legend()->hide();
chart->setTitle("Logarithmic Axis");

创建坐标轴。将它们添加到图表中，并附加到系列上。

auto axisX = new QValueAxis;
axisX->setTitleText("Data point");
axisX->setLabelFormat("%i");
axisX->setTickCount(series->count());
chart->addAxis(axisX, Qt::AlignBottom);
series->attachAxis(axisX);

auto axisY = new QLogValueAxis;
axisY->setTitleText("Values");
axisY->setLabelFormat("%g");
axisY->setBase(8.0);
axisY->setMinorTickCount(-1);
chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisY);

然后创建一个QChartView 对象，并将QChart 作为参数。

createDefaultChartView(chart);

图表就可以显示了。

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