Using Logarithmic Value Axes
Note: This is part of the Charts with Widgets Gallery example.
Create a QLineSeries instance and add some data to it.
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);
The chart is ready to be shown.
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