Creating Line Charts

To create a line chart, a QLineSeries instance is needed. Let's create one.

 auto series = new QLineSeries;

Then we add data to the series. We can use the append() member function or use the stream operator.

 series->append(0, 6);
 series->append(2, 4);
 series->append(3, 8);
 series->append(7, 4);
 series->append(10, 5);
 *series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

To present the data on the chart we need a QChart instance. We add the series to it, create the default axes, and set the title of the chart.

 auto chart = new QChart;
 chart->legend()->hide();
 chart->addSeries(series);
 chart->createDefaultAxes();
 chart->setTitle("Simple Line Chart");

Then we create a QChartView object with QChart as a parameter. This way we don't need to create a QGraphicsView scene ourselves.

 createDefaultChartView(chart);

The chart is ready to be shown.