Using Logarithmic Value Axes

Create a QLineSeries instance and add some data to it.

 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);

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.

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

Create the axes. Add them to the chart and attach to the series.

 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);

Then create a QChartView object with QChart as a parameter.

 createDefaultChartView(chart);

The chart is ready to be shown.